Organic light-emitting diode

Abstract

The present invention relates to an organic electroluminescent device comprising at least one light-emitting layer B composed of one or more sublayers, wherein the one or more sublayers of the light-emitting layer B collectively comprise at least one host material HB, at least one phosphorescent material PB, at least one small FWHM emitter SB, and optionally at least one TADF material EB, wherein SB emits light having a full width at half maximum (FWHM) of 0.25 eV or less.

Description

Technology Field

[0001] The present invention relates to an organic electroluminescent device and a method for generating light using the organic electroluminescent device according to the present invention.

[0002] The present invention relates to an organic electroluminescent device comprising one or more light-emitting layers B, each composed of one or more sublayers, wherein one or more sublayers of each light-emitting layer B are, in total, at least one host material H B , at least one phosphorescent material P B , at least one small FWHM emitter S B , and optionally at least one TADF material E B Includes, wherein at least one, preferably each S B It emits light having a full width at half maximum (FWHM) of 0.25 eV or less. In addition, the present invention relates to a method for generating light using an organic electroluminescent device according to the present invention.

[0003] For example, the importance of organic electroluminescent devices containing one or more emissive layers based on organic materials, such as organic light-emitting diodes (OLEDs), light-emitting electrochemical cells (LECs), and light-emitting transistors, is increasing. In particular, OLEDs are promising devices for electronic products such as screens, displays, and lighting devices. In contrast to most electroluminescent devices based on inorganic materials, organic electroluminescent devices based on organic materials are often somewhat flexible and, in particular, can be produced as thin films. While OLED-based screens and displays already available today offer excellent efficiency and long lifespan or excellent color purity and long lifespan, they do not combine all three characteristics—excellent efficiency, long lifespan, and excellent color purity—all together.

[0004] The color purity or color point of OLEDs is typically provided by CIEx and CIEy coordinates, whereas the color gamut of next-generation displays is provided by so-called BT-2020 and DCPI3 values. Generally, to obtain these color coordinates, the top light-emitting element requires adjusting the color coordinates by changing the cavity. To achieve high efficiency in the top light-emitting element while targeting this color gamut, a narrow emission spectrum is required in the bottom light-emitting element.

[0005] Modern phosphorescent emitters exhibit a somewhat broad emission, which is reflected in the broad emission of phosphorescent-based OLEDs (PHOLEDs), which typically have a full width at half maximum (FWHM) of the emission spectrum greater than 0.25 eV. The broad emission spectrum of the PHOLED in the bottom device results in a high loss of outcoupling efficiency for top-emitting device structures targeting the BT-2020 and DCPI3 color gamuts.

[0006] Furthermore, phosphorescent materials are typically based on transition metals, such as iridium, which are generally not abundant and are therefore significantly expensive materials within OLED stacks. Consequently, transition metal-based materials hold the greatest potential for reducing OLED costs. Lowering the transition metal content within OLED stacks is therefore a key performance indicator for pricing OLED-applied products.

[0007] Recently, some fluorescence or TADF (thermally-activated-delayed-fluorescence) emitters have been developed that exhibit a somewhat narrow emission spectrum, which generally shows a FWHM of the emission spectrum of 0.25 eV or less, and thus are suitable for achieving the BT-2020 and DCPI3 color gamuts. However, such fluorescence and TADF emitters generally suffer from low efficiency due to a short lifetime caused by, for example, exciton-polaron annihilation or exciton-exciton annihilation, as well as a decrease in efficiency at higher brightness (i.e., the roll-off behavior of the OLED).

[0008] These disadvantages can be overcome to some extent by applying a so-called hyper approach. As previously mentioned, the latter relies on the use of an energy pump that transfers energy to a fluorescent emitter, which preferably exhibits a narrow emission spectrum. The energy pump may be, for example, a TADF material exhibiting reverse-intersystem crossing (RISC) or a transition metal complex exhibiting efficient intersystem crossing (ISC). However, this approach still fails to provide an organic electroluminescent device that possesses all of the aforementioned desirable features, namely excellent efficiency, long lifetime, and excellent color purity.

[0009] The central element of an organic electroluminescent device for generating light is typically at least one light-emitting layer located between an anode and a cathode. When voltage (and current) is applied to the organic electroluminescent device, holes are injected from the anode and electrons from the cathode, respectively.

[0010] Typically, a hole transport layer is located between the emitting layer and the anode (typically), and an electron transport layer is typically located between the emitting layer and the cathode. Different layers are arranged sequentially. High-energy excitons are then generated in the emitting layer by the recombination of holes and electrons. Decay of these excited states (e.g., a singlet state such as S1 and / or a triplet state such as T1) to a ground state (S0) preferably causes luminescence.

[0011] Surprisingly, it was discovered that the emitting layer of an organic electroluminescent device, comprising one or more layers including a phosphorescent material, a small full width at half maximum (FWHM) emitter, a host material, and optionally a TADF material, provides an organic electroluminescent device that exhibits a narrow emission, has a long lifetime and high quantum yield, and is ideally suitable for achieving the BT-2020 and DCPI3 color gamuts.

[0012] Here, a phosphorescent material and / or an optional TADF material can transfer energy to a small full width at half maximum (FWHM) emitter that exhibits luminescence.

[0013] The present invention relates to an organic electroluminescent device comprising at least one light-emitting layer B composed of one or more sublayers, wherein the one or more sublayers are adjacent to each other and collectively comprise:

[0014] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ; and

[0015] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0016] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and optionally

[0017] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B ,

[0018] Here, one or more sublayers located on the outer surface of the light-emitting layer (B) are phosphorescent materials P B , small FWHM emitter S B and TADF material E B It includes at least one (emitter) material selected from the group consisting of

[0019] One aspect of the present invention relates to an organic electroluminescent device comprising at least one light-emitting layer B comprising one or more sublayers, wherein the one or more sublayers are adjacent to each other and collectively comprise:

[0020] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H Host material H having ) B ; and

[0021] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P Phosphorescent material P having ) B ; and

[0022] (iii) Lowest excited singlet state energy level E(S1 S) and lowest excited triplet state energy level E(T1 S A small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and optionally

[0023] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E Thermally activated delayed fluorescence (TADF) material E having ) B ,

[0024] Here, one or more sublayers located on the outer surface of the light-emitting layer (B) are phosphorescent materials P B , small FWHM emitter S B and TADF material E B It includes at least one (emitter) material selected from the group consisting of

[0025] In one embodiment of the present invention, at least one of one or more sublayers of at least one light-emitting layer B comprises:

[0026] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B .

[0027] In one embodiment of the present invention, an organic electroluminescent device comprises at least one emitting layer B composed of one or more sublayers, wherein one or more sublayers of the emitting layer B comprise the following:

[0028] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ; and

[0029] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0030] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and optionally

[0031] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B .

[0032] In one embodiment of the present invention, an organic electroluminescent device comprises at least one emitting layer B composed of one or more sublayers, wherein one or more sublayers of the emitting layer B comprise the following:

[0033] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H Host material H having ) B ; and

[0034] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P Phosphorescent material P having ) B ; and

[0035] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 SA small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and

[0036] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E Thermally activated delayed fluorescence (TADF) material E having ) B .

[0037] In one embodiment of the present invention, an organic electroluminescent device comprises at least one emitting layer B composed of one or more sublayers, wherein one or more sublayers of the emitting layer B comprise the following:

[0038] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ; and

[0039] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0040] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and

[0041] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B .

[0042] In one embodiment of the present invention, the organic electroluminescent device comprises at least one light-emitting layer B comprising the following:

[0043] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ; and

[0044] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0045] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and

[0046] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B .

[0047] In one embodiment of the present invention, the organic electroluminescent device comprises a light-emitting layer B composed of exactly one layer including the following:

[0048] (i) Host material H B ; and

[0049] (ii) Phosphorescent material P B ; and

[0050] (iii) Small Full Width Hinter (FWHM) Emitter S B ; and optionally

[0051] (iv) TADF material E B .

[0052] In a preferred embodiment, the organic electroluminescent device comprises a light-emitting layer B composed of exactly one layer including:

[0053] (i) at least one host material H B ; and

[0054] (ii) at least one phosphorescent material P B ; and

[0055] (iii) at least one small full width at half maximum (FWHM) emitter S B ; and

[0056] (iv) at least one thermally activated delayed fluorescence (TADF) material E B .

[0057] Combination of lower classes

[0058] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B composed of exactly one (sub)layer. In a preferred embodiment of the present invention, each emitting layer B included in the electroluminescent device according to the present invention comprises exactly one (sub)layer. In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises exactly one emitting layer B composed of exactly one (sub)layer.

[0059] In another embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers. In another embodiment of the present invention, each light-emitting layer B included in the electroluminescent device according to the present invention comprises more than one sublayer. In another embodiment of the present invention, each light-emitting layer B included in the electroluminescent device according to the present invention is composed of one or more sublayers.

[0060] In another embodiment of the present invention, the electroluminescent device according to the present invention comprises exactly one light-emitting layer B composed of one or more sublayers. In another embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of exactly two sublayers.

[0061] In another embodiment of the present invention, each light-emitting layer B included in the electroluminescent device according to the present invention is composed of exactly two sublayers. In another embodiment of the present invention, the electroluminescent device according to the present invention includes exactly one light-emitting layer B composed of exactly two sublayers.

[0062] In another embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B composed of two or more sublayers. In another embodiment of the present invention, each emitting layer B included in the electroluminescent device according to the present invention is composed of two or more sublayers.

[0063] In another embodiment of the present invention, the electroluminescent element according to the present invention comprises exactly one light-emitting layer B composed of more than two sublayers.

[0064] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent device according to the present invention comprises exactly one, exactly two, or exactly three sublayers.

[0065] It is understood that the different sublayers of the light-emitting layer B do not necessarily all contain the same material or even the same material in the same proportion.

[0066] Different sublayers of the light-emitting layer (B) are understood to be adjacent to each other.

[0067] In one embodiment of the present invention, at least one sublayer is exactly one TADF material E B and exactly one phosphorescent material P B Includes

[0068] In one embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is a TADF material E B , phosphorescent material P B , or small FWHM emitter S B It does not include.

[0069] In one embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer comprises at least one host material H B , exactly one phosphorescent material P B , and exactly one small FWHM emitter S B Includes

[0070] In one embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer comprises at least one host material H B , exactly one TADF material E B , exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes

[0071] In one embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B , exactly one TADF material E B , exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes

[0072] In one embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B , exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes

[0073] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B Includes

[0074] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein the one or more sublayers are exactly one TADF material E B Includes

[0075] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one phosphorescent material P B Includes

[0076] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one small FWHM emitter S B Includes

[0077] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B and exactly one TADF material E B Includes

[0078] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B and exactly one phosphorescent material P B Includes

[0079] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B and exactly one small FWHM emitter S B Includes

[0080] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one TADF material E B and exactly one small FWHM emitter S B Includes

[0081] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one TADF material E B and exactly one phosphorescent material P B Includes

[0082] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes

[0083] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B , exactly one TADF material E B , and exactly one small FWHM emitter S B Includes

[0085] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B , exactly one TADF material E B , and exactly one phosphorescent material P B Includes

[0087] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material H B , exactly one phosphorescent material P B , and exactly one small FWHM emitter S B Includes

[0089] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one phosphorescent material P B , exactly one TADF material E B , and exactly one small FWHM emitter S B Includes

[0090] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein at least one sublayer is exactly one host material HB , exactly one TADF material E B , exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes

[0091] In a preferred embodiment of the present invention, one sublayer is exactly one TADF material E B It includes, and one sublayer (preferably another sublayer) is exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes

[0092] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B comprising (or composed thereof) three or more sublayers, wherein the first sublayer B1 is exactly one TADF material E B It includes, and the second sublayer B2 is exactly one phosphorescent material P B Includes, and the third sublayer B3 is exactly one small FWHM emitter S B Includes

[0093] The sublayers of the light-emitting layer B can be manufactured in different order, for example, B1 - B2 - B3, B1 - B3 - B2, B2 - B1 - B3, B2 - B3 - B1, B3 - B2 - B1, B3 - B1 - B2, and may have one or more other sublayers in between.

[0094] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B comprising (or composed thereof) two or more sublayers, wherein the first sublayer B1 is exactly one TADF material E B and exactly one phosphorescent material P B Includes, and the second sublayer B2 is exactly one small FWHM emitter S B Includes

[0095] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B comprising (or composed thereof) two or more sublayers, wherein the first sublayer B1 is exactly one TADF material E B It includes, and the second sublayer B2 is exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes

[0096] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B comprising (or composed thereof) two or more sublayers, wherein the first sublayer B1 is exactly one phosphorescent material P B Includes, and the second sublayer B2 is exactly one TADF material E B and exactly one small FWHM emitter S B Includes

[0097] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one emitting layer B comprising (or composed thereof) two or more sublayers, wherein the first sublayer B1 is exactly one small FWHM emitter S B Includes, and the second sublayer B2 is exactly one TADF material E B and exactly one phosphorescent material P B Includes. In a preferred embodiment, lower layers B1 and B2 are (directly) adjacent to each other, that is, in other words, (directly) in contact with each other.

[0098] It is understood that an organic electroluminescent device according to the present invention may optionally also include one or more light-emitting layers that do not satisfy the requirements given for the light-emitting layer B in the context of the present invention. That is: an organic electroluminescent device according to the present invention may include at least one light-emitting layer B as defined herein, and may optionally include one or more additional light-emitting layers to which the requirements given herein for the light-emitting layer B do not necessarily apply. In another embodiment of the present invention, at least one, but not all, of the light-emitting layers included in the organic electroluminescent device according to the present invention is the light-emitting layer B as defined in a specific embodiment of the present invention.

[0099] In a preferred embodiment of the present invention, each light-emitting layer included in the organic electroluminescent device according to the present invention is a light-emitting layer B as defined in a specific embodiment of the present invention.

[0100] Composition of light-emitting layer (EML) B

[0101] (At least one) host material H B , (at least one) phosphorescent material P B and (at least one) small half-width emitter S B It can be included in an organic electroluminescent device in any amount and any ratio.

[0102] In a preferred embodiment, (at least one) host material H B , (at least one) phosphorescent material P B , (at least one) thermally activated delayed fluorescence (TADF) material E B , and (at least one) small FWHM emitter S B It can be included in an organic electroluminescent device in any amount and any ratio.

[0103] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein each of the at least one sublayer is a (at least one) host material H B (More specifically: H P and / or H N and / or H BP ) (at least one) small FWHM emitter S B It includes more weight.

[0104] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein each of the at least one sublayer is a (at least one) host material H B (More specifically: H P and / or H N and / or H BP ) (at least one) phosphorescent material P B It includes more weight.

[0105] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention comprises at least one light-emitting layer B composed of one or more sublayers, wherein each of the at least one sublayer is a (at least one) host material H B (More specifically: H P and / or H N and / or H BP ) (at least one) TADF material E B It includes more weight.

[0106] In a preferred embodiment of the present invention, each of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention is at least one TADF material E B at least one small FWHM emitter S B It includes more weight.

[0107] In a preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0108] (i) 30-99.8 wt% of one or more host materials H B ;

[0109] (ii) 0.1-30 wt% of one or more phosphorescent materials P B ; and

[0110] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0111] (v) 0-69.8 wt% of one or more solvents.

[0112] In a preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0113] (i) 30-99.8 wt%, preferably 60-99.8 wt%, of one or more host materials H B ;

[0114] (ii) 0.1-50 wt%, preferably 0.1-30 wt%, of one or more phosphorescent materials P B ; and

[0115] (iii) 0.1-20 wt%, preferably 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0116] (v) 0-3 wt% of one or more solvents.

[0117] In a preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0118] (i) 30-99.8 wt% of one or more host materials H B ;

[0119] (ii) 0.1-20 wt% of one or more phosphorescent materials P B ; and

[0120] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0121] (v) 0-69.8 wt% of one or more solvents.

[0122] In a preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0123] (i) 30-99.8 wt%, preferably 70-99.8 wt%, of one or more host materials H B ;

[0124] (ii) 0.1-20 wt% of one or more phosphorescent materials P B ; and

[0125] (iii) 0.1-50 wt%, preferably 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0126] (v) 0-3 wt% of one or more solvents.

[0127] E BIn an optional preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0128] (i) 30-99.8 wt% of one or more host materials H B ;

[0129] (ii) 0.1-30 wt% of one or more phosphorescent materials P B ; and

[0130] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0131] (iv) 0-69.8 wt% of one or more TADF materials E B ; and optionally

[0132] (v) 0-69.8 wt% of one or more solvents.

[0133] E B In an optional preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0134] (i) 30-99.8 wt% of one or more host materials H B ;

[0135] (ii) 0.1-30 wt% of one or more phosphorescent materials P B ; and

[0136] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0137] (iv) 0-69.8 wt% of one or more TADF materials E B ; and optionally

[0138] (v) 0-3 wt% of one or more solvents.

[0139] E B In an optional preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0140] (i) 30-99.8 wt% of one or more host materials H B ;

[0141] (ii) 0.1-20 wt% of one or more phosphorescent materials P B ; and

[0142] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0143] (iv) 0-69.8 wt% of one or more TADF materials E B ; and optionally

[0144] (v) 0-69.8 wt% of one or more solvents.

[0145] E B In an optional preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0146] (i) 30-99.8 wt% of one or more host materials H B ;

[0147] (ii) 0.1-20 wt% of one or more phosphorescent materials P B ; and

[0148] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally

[0149] (iv) 0-69.8 wt% of one or more TADF materials E B ; and optionally

[0150] (v) 0-3 wt% of one or more solvents.

[0151] E B In an optional more preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0152] (i) 30-87.8 wt% of one or more host materials H B ;

[0153] (ii) 0.1-30 wt% of one or more phosphorescent materials P B ; and

[0154] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and

[0155] (iv) 12-40 wt% of one or more TADF materials E B ; and optionally

[0156] (v) 0-57.8 wt% of one or more solvents.

[0157] E B In an optional more preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0158] (i) 30-87.8 wt% of one or more host materials H B ;

[0159] (ii) 0.1-30 wt% of one or more phosphorescent materials P B ; and

[0160] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and

[0161] (iv) 12-40 wt% of one or more TADF materials E B ; and optionally

[0162] (v) 0-3 wt% of one or more solvents.

[0163] E B In an optional more preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0164] (i) 30-87.8 wt% of one or more host materials H B ;

[0165] (ii) 0.1-20 wt% of one or more phosphorescent materials P B ; and

[0166] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and

[0167] (iv) 12-40 wt% of one or more TADF materials E B ; and optionally

[0168] (v) 0-57.8 wt% of one or more solvents.

[0169] E B In an optional preferred embodiment, in an organic electroluminescent device according to the present invention, at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) comprises (or is composed of) the following as a whole:

[0170] (i) 30-87.8 wt% of one or more host materials H B ;

[0171] (ii) 0.1-20 wt% of one or more phosphorescent materials PB ; and

[0172] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and

[0173] (iv) 12-40 wt% of one or more TADF materials E B ; and optionally

[0174] (v) 0-3 wt% of one or more solvents.

[0175] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises one or more phosphorescent materials P in an amount of 5 weight percent or less. B Includes

[0176] In one embodiment of the present invention, the organic electroluminescent device comprises at least one light-emitting layer B comprising the following:

[0177] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ;

[0178] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0179] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ;

[0180] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1E At least one thermally activated delayed fluorescence (TADF) material E having ) B ,

[0181] Here, the relationship expressed by the following equations (1) and (2) is applied:

[0182] E(T1 H ) > E(T1 P ) (1)

[0183] E(T1 P ) > E(S1 S ) (2),

[0184] Here, (at least one), preferably each light-emitting layer B comprises one or more phosphorescent materials P in an amount of 5 weight percent or less. B Includes

[0185] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0186] (i) 30-96.8 wt% of one or more host materials H B (Also host compound H B Can also be referred to as);

[0187] (ii) 0.1-5 wt% of one or more phosphorescent materials P B ; and

[0188] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ;

[0189] (iv) 3-69.8 wt% of one or more TADF materials E B ; and optionally

[0190] (v) 0-66.8 wt% of one or more solvents.

[0191] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0192] (i) 30-96.8 wt% of one or more host materials H B(Also host compound H B Can also be referred to as);

[0193] (ii) 0.1-5 wt% of one or more phosphorescent materials P B ; and

[0194] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ;

[0195] (iv) 3-69.8 wt% of one or more TADF materials E B ; and optionally

[0196] (v) 0-3 wt% of one or more solvents.

[0197] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0198] (i) 30-89.8 wt% of one or more host materials H B (Also host compound H B Can also be referred to as);

[0199] (ii) 0.1-5 wt% of one or more phosphorescent materials P B ; and

[0200] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ;

[0201] (iv) 10-40 wt% of one or more TADF materials E B ; and optionally

[0202] (v) 0-59.8 wt% of one or more solvents.

[0203] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0204] (i) 30-89.8 wt% of one or more host materials H B (Also host compound H B Can also be referred to as);

[0205] (ii) 0.1-5 wt% of one or more phosphorescent materials P B ; and

[0206] (iii) 0.1-10 wt% of one or more small FWHM emitters S B ;

[0207] (iv) 10-52 wt% of one or more TADF materials E B ; and optionally

[0208] (v) 0-3 wt% of one or more solvents.

[0209] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0210] (i) 30-96.8 wt% of one or more host materials H B (Also host compound H B Can also be referred to as);

[0211] (ii) 0.1-5 wt% of one or more phosphorescent materials P B ; and

[0212] (iii) 0.1-5 wt% of one or more small FWHM emitters S B ;

[0213] (iv) 3-69.8 wt% of one or more TADF materials E B ; and optionally

[0214] (v) 0-66.8 wt% of one or more solvents.

[0215] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0216] (i) 30-96.8 wt% of one or more host materials H B (Also host compound H B Can also be referred to as);

[0217] (ii) 0.1-5 wt% of one or more phosphorescent materials P B; and

[0218] (iii) 0.1-5 wt% of one or more small FWHM emitters S B ;

[0219] (iv) 3-69.8 wt% of one or more TADF materials E B ; and optionally

[0220] (v) 0-3 wt% of one or more solvents.

[0221] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0222] (i) 30-87.8 wt% of one or more host materials H B (Also host compound H B Can also be referred to as);

[0223] (ii) 0.1-5 wt% of one or more phosphorescent materials P B ; and

[0224] (iii) 0.1-5 wt% of one or more small FWHM emitters S B ;

[0225] (iv) 12-40 wt% of one or more TADF materials E B ; and optionally

[0226] (v) 0-57.8 wt% of one or more solvents.

[0227] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises or is composed of the following:

[0228] (i) 30-87.8 wt% of one or more host materials H B (Also host compound H B Can also be referred to as);

[0229] (ii) 0.1-5 wt% of one or more phosphorescent materials P B ; and

[0230] (iii) 0.1-5 wt% of one or more small FWHM emitters S B ;

[0231] (iv) 12-57 wt% of one or more TADF materials E B ; and optionally

[0232] (v) 0-3 wt% of one or more solvents.

[0233] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises 3 weight% or less of a phosphorescent material P. B Includes

[0234] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises 1 weight% or less of a phosphorescent material P. B Includes

[0235] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises 10-40 weight% of one or more TADF materials E B Includes

[0236] In one embodiment of the present invention, (at least one) small full width at half maximum (FWHM) emitter S B of (at least one) phosphorescent material P B Mass ratio (S) for B : P B ) is ≥1.

[0237] In one embodiment of the present invention, in at least one light-emitting layer B, (at least one) small full width at half maximum (FWHM) emitter S B of (at least one) phosphorescent material P B Mass ratio (S) for B : P B ) is ≥1. In one embodiment of the present invention, in each light-emitting layer B, (at least one) small full width at half maximum (FWHM) emitter S B of (at least one) phosphorescent material P B Mass ratio (S) for B : P B ) is ≥1.

[0238] In one embodiment of the present invention, (at least one) small full width at half maximum (FWHM) emitter S B of (at least one) phosphorescent material P B Mass ratio (S) for B : P B ) is <1.

[0239] In one embodiment of the present invention, in at least one light-emitting layer B, (at least one) small full width at half maximum (FWHM) emitter S B of (at least one) phosphorescent material P B Mass ratio (S) for B : P B ) is <1. In one embodiment of the present invention, in each light-emitting layer B, (at least one) small full width at half maximum (FWHM) emitter S B of (at least one) phosphorescent material P B Mass ratio (S) for B : P B ) is <1.

[0240] In one embodiment of the present invention, the mass ratio S B :P B is in the range of 1:1 to 30:1, 1.5:1 to 25:1, 2:1 to 20:1, 4:1 to 15:1, 5:1 to 12:1, or 10:1 to 11:1. For example, mass ratio S B :P B It is in the range of (approximately) 20:1, 15:1, 12:1, 10:1, 8:1, 5:1, 4:1, 2:1, 1.5:1, or 1:1.

[0241] In one embodiment of the present invention, (at least one) small full width at half maximum (FWHM) emitter S B of (at least one) phosphorescent material P B Mass ratio (S) for B : P B ) is <1.

[0242] In one embodiment of the present invention, mass ratio PB :S B It is in the range of 1:1 to 30:1, 1.5:1 to 25:1, 2:1 to 20:1, 4:1 to 15:1, 5:1 to 12:1, or 10:1 to 11:1. For example, mass ratio P B :S B It is in the range of (approximately) 20:1, 15:1, 12:1, 10:1, 8:1, 5:1, 4:1, 2:1, 1.5:1, or 1:1.

[0243] As previously mentioned, it is understood that the different sublayers of the light-emitting layer B do not necessarily all contain the same material or even the same material in the same proportion.

[0244] S1-T1-Energy Relationship

[0245] In one embodiment of the present invention, the relationship expressed by the following formulas (1) and (2) is applied:

[0246] E(T1 H ) > E(T1 P ) (1)

[0247] E(T1 P ) > E(S1 S ) (2),

[0248] Therefore, each host material H B The lowest excitation triplet state T1 H Each phosphorescent material P B The lowest excitation triplet state T1 P Higher energy, and each phosphorescent material P B The lowest excitation triplet state T1 P is each small FWHM emitter S B The lowest excitation singlet state S1 S It has higher energy.

[0249] In one embodiment, the above-mentioned relationship, expressed by equations (1) and (2), is applied to the material included in the same light-emitting layer B of the organic electroluminescent device according to the present invention.

[0250] An organic electroluminescent device comprising at least one light-emitting layer B comprises:

[0251] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ; and

[0252] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0253] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and

[0254] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B ,

[0255] Here, the relationship expressed by the following equations (1) and (2) is applied.

[0256] E(T1 H ) > E(T1 P ) (1)

[0257] E(T1 P ) > E(S1 S) (2).

[0258] In one embodiment, the aforementioned relationship expressed by equations (1) and (2) is applied to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention.

[0259] In a preferred embodiment of the present invention, the relationship expressed by the following formulas (3) and (4) is applied.

[0260] E(T1 H ) > E(T1 E ) (3)

[0261] E(T1 E ) > E(T1 P ) (4),

[0262] Therefore, each host material H B The lowest excitation triplet state T1 H is each TADF material E B The lowest excitation triplet state T1 E Higher energy, and each TADF material E B The lowest excitation triplet state T1 E Each phosphorescent material P B The lowest excitation triplet state T1 P It has higher energy.

[0263] In one embodiment, the aforementioned relationship expressed by equations (3) and (4) applies to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by equations (3) and (4) applies to a material included in the same light-emitting layer B of the organic electroluminescent device according to the present invention.

[0264] In an alternative embodiment of the present invention, the relationship expressed by the following formulas (5) and (6) is applied.

[0265] E(T1 P ) > E(T1 E ) (5)

[0266] E(S1 E ) > E(S1 S ) (6),

[0267] Therefore, each phosphorescent material P B The lowest excitation triplet state T1 P is each TADF material E B The lowest excitation triplet state T1 E Higher energy, and each TADF material E B The lowest excitation triplet state S1 E is each small FWHM emitter S B The lowest excitation singlet state S1 S It has higher energy.

[0268] In one embodiment, the aforementioned relationship expressed by equations (5) and (6) applies to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by equations (5) and (6) applies to a material included in the same light-emitting layer B of the organic electroluminescent device according to the present invention.

[0269] In a preferred embodiment of the present invention, the relationship expressed by the following formulas (1) to (4) is applied:

[0270] E(T1 H ) > E(T1 P ) (1)

[0271] E(T1 P ) > E(S1 S ) (2)

[0272] E(T1 H ) > E(S1 E ) (3)

[0273] E(T1 E ) > E(T1 P ) (4).

[0274] In one embodiment, the aforementioned relationship expressed by formulas (1) to (4) is applied to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by formulas (1) to (4) is applied to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0275] In one embodiment of the present invention, each phosphorescent material P B The lowest excitation triplet state T1 P and each TADF material E B The lowest excitation triplet state T1 E The (energy) difference between them is less than 0.3 eV:

[0276] Each, E(T1 P ) - E(T1 E ) < 0.3 eV and E(T1 E ) - E(T1 P ) < 0.3 eV.

[0277] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P and at least one, preferably each TADF material E B The lowest excitation triplet state T1 E The energy difference between them is less than 0.3 eV:

[0278] Each, E(T1 P ) - E(T1 E ) < 0.3 eV and E(T1 E ) - E(T1 P ) < 0.3 eV.

[0279] In one embodiment of the present invention, in each of one or more light-emitting layers B, at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 Pand at least one, preferably each TADF material E B The lowest excitation triplet state T1 E The energy difference between them is less than 0.3 eV:

[0280] Each, E(T1 P ) - E(T1 E ) < 0.3 eV and E(T1 E ) - E(T1 P ) < 0.3 eV.

[0281] In one embodiment of the present invention, the relationship expressed by the following formula (4) is applied:

[0282] E(T1 E ) > E(T1 P ) (4).

[0283] In one embodiment, the aforementioned relationship expressed by Equation (4) is applied to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by Equation (4) is applied to a material included in the same light-emitting layer B of the organic electroluminescent device according to the present invention.

[0284] In a preferred embodiment of the present invention, at least one, preferably each TADF material E B The lowest excitation triplet state T1 E and at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P The energy difference between them is less than 0.2 eV:

[0285] E(T1 E ) - E(T1 P ) < 0.2 eV.

[0286] In a preferred embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each TADF material E B The lowest excitation triplet state T1 Eand at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P The energy difference between them is less than 0.2 eV:

[0287] E(T1 E ) - E(T1 P ) < 0.2 eV.

[0288] In a preferred embodiment of the present invention, in each of one or more light-emitting layers B, at least one, preferably each TADF material E B The lowest excitation triplet state T1 E and at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P The energy difference between is less than 0.2 eV:

[0289] E(T1 E ) - E(T1 P ) < 0.2 eV.

[0290] In a preferred embodiment of the present invention, at least one, preferably each phosphorescent material P, is provided. B The lowest excitation triplet state T1 P and at least one, preferably each small full width at half maximum (FWHM) emitter S B The lowest excitation triplet state S1 S (Energy level E(S1 S The energy difference between )) is less than 0.3 eV:

[0291] E(T1 P ) - E(S1 S ) < 0.3 eV.

[0292] In a preferred embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P and at least one, preferably each small full width at half maximum (FWHM) emitter S BThe lowest excitation singlet state S1 S The energy difference between them is less than 0.3 eV:

[0293] E(T1 P ) - E(S1 S ) < 0.3 eV.

[0294] In a preferred embodiment of the present invention, in each of one or more light-emitting layers B, at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P and at least one, preferably each small full width at half maximum (FWHM) emitter S B The lowest excitation singlet state S1 S The energy difference between them is less than 0.3 eV:

[0295] E(T1 P ) - E(S1 S ) < 0.3 eV.

[0296] In a preferred embodiment of the present invention, each phosphorescent material P B The lowest excitation triplet state T1 P and each small full width at half maximum (FWHM) emitter S B The lowest excitation singlet state S1 S (Energy level E(S1 S The energy difference between )) is less than 0.2 eV:

[0297] E(T1 P ) - E(S1 S ) < 0.2 eV.

[0298] In a preferred embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P and at least one, preferably each small full width at half maximum (FWHM) emitter S B The lowest excitation singlet state S1 S The energy difference between them is less than 0.2 eV:

[0299] E(T1 P ) - E(S1 S ) < 0.2 eV.

[0300] In a preferred embodiment of the present invention, in each of one or more light-emitting layers B, at least one, preferably each phosphorescent material P B The lowest excitation triplet state T1 P and at least one, preferably each small full width at half maximum (FWHM) emitter S B The lowest excitation singlet state S1 S The energy difference between them is less than 0.2 eV:

[0301] E(T1 P ) - E(S1 S ) < 0.2 eV.

[0302] HOMO-LUMO energy

[0303] In a preferred embodiment of the present invention, the following requirements are satisfied:

[0304] (i) Each host material H B is energy E HOMO (H B HOMO(H) with the highest occupied molecular orbital B Having ); and

[0305] (ii) Each phosphorescent material P B energy E HOMO (P B HOMO(P) with the highest occupied molecular orbital B Having ); and

[0306] (iii) Each small full width at half maximum (FWHM) emitter S B is energy E HOMO (S B HOMO(S) with the highest occupied molecular orbital B has )

[0307] Here, the relationship expressed by the following equations (10) and (11) is applied.

[0308] E HOMO (PB ) > E HOMO (H B ) (10)

[0309] E HOMO (P B ) > E HOMO (S B ) (11).

[0310] In one embodiment, the aforementioned relationship expressed by equations (10) and (11) applies to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by equations (10) and (11) applies to a material included in the same light-emitting layer B of the organic electroluminescent device according to the present invention.

[0311] In one embodiment of the present invention, energy E HOMO (S B Each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B ) is energy EHOMO(H B Each host material H having ) B The highest occupied molecular orbital of HOMO(H B The energy is higher than ).

[0312] E HOMO (S B ) > E HOMO (H B ).

[0313] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B ) is energy E HOMO (H B At least one, preferably each host material H having ) B The highest occupied molecular orbital of HOMO(HB The energy is higher than )

[0314] E HOMO (S B ) > E HOMO (H B ).

[0315] In one embodiment of the present invention, in each of at least one light-emitting layer B, energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B ) is energy E HOMO (H B At least one, preferably each host material H having ) B The highest occupied molecular orbital of HOMO(H B The energy is higher than )

[0316] E HOMO (S B ) > E HOMO (H B ).

[0317] In one embodiment of the present invention, energy E HOMO (S B Each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B ) is energy E HOMO (E B Each TADF material E having ) B The highest occupied molecular orbital of HOMO(E B The energy is higher than )

[0318] E HOMO (S B ) > E HOMO (E B ).

[0319] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (S BAt least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B ) is energy E HOMO (E B At least one, preferably each TADF material E having ) B The highest occupied molecular orbital of HOMO(E B The energy is higher than )

[0320] E HOMO (S B ) > E HOMO (E B ).

[0321] In one embodiment of the present invention, in each of at least one light-emitting layer B, energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B ) is energy E HOMO (E B At least one, preferably each TADF material E having ) B The highest occupied molecular orbital of HOMO(E B The energy is higher than )

[0322] E HOMO (S B ) > E HOMO (E B ).

[0323] In one embodiment of the present invention, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (E B At least one, preferably each TADF material E having ) B The highest occupied molecular orbital of HOMO(E BThe energy is higher than ):

[0324] E HOMO (P B ) > E HOMO (E B ).

[0325] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (E B At least one, preferably each TADF material E having ) B The highest occupied molecular orbital of HOMO(E B The energy is higher than )

[0326] E HOMO (P B ) > E HOMO (E B ).

[0327] In one embodiment of the present invention, in each of at least one light-emitting layer B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (E B At least one, preferably each TADF material E having ) B The highest occupied molecular orbital of HOMO(E B The energy is higher than )

[0328] E HOMO (P B ) > E HOMO (E B ).

[0329] In one embodiment of the present invention, energy E HOMO (P BAt least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (H B At least one, preferably each host material H having ) B The highest occupied molecular orbital of HOMO(H B The energy is higher than ):

[0330] E HOMO (P B ) > E HOMO (H B ).

[0331] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (H B At least one, preferably each host material H having ) B The highest occupied molecular orbital of HOMO(H B The energy is higher than ):

[0332] E HOMO (P B ) > E HOMO (H B ).

[0333] In one embodiment of the present invention, in each of at least one light-emitting layer B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (H B At least one, preferably each host material H having ) B The highest occupied molecular orbital of HOMO(H BThe energy is higher than ):

[0334] E HOMO (P B ) > E HOMO (H B ).

[0335] In one embodiment of the present invention, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy is higher than )

[0336] E HOMO (P B ) > E HOMO (S B ).

[0337] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy is higher than ):

[0338] E HOMO (P B ) > E HOMO (S B ).

[0339] In one embodiment of the present invention, in each of at least one light-emitting layer B, energy E HOMO (P BAt least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) is energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy is higher than ):

[0340] E HOMO (P B ) > E HOMO (S B ).

[0341] In one embodiment of the present invention, at least one, preferably each energy E, is provided. HOMO (P B Phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and at least one, preferably each energy E HOMO (S B Small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The (energy) difference between ) is less than 0.3 eV:

[0342] E HOMO (P B ) - E HOMO (S B ) < 0.3 eV.

[0343] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) BThe highest occupied molecular orbital of HOMO(S B The energy difference between ) is less than 0.3 eV:

[0344] E HOMO (P B ) - E HOMO (S B ) < 0.3 eV.

[0345] In one embodiment of the present invention, in each of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy difference between ) is less than 0.3 eV:

[0346] E HOMO (P B ) - E HOMO (S B ) < 0.3 eV.

[0347] In one embodiment of the present invention, energy E HOMO (P B Each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B Each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The (energy) difference between ) is less than 0.2 eV:

[0348] E HOMO (P B ) - E HOMO (S B ) < 0.2 eV.

[0349] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy difference between ) is less than 0.2 eV:

[0350] E HOMO (P B ) - E HOMO (S B ) < 0.2 eV.

[0351] In one embodiment of the present invention, in each of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy difference between ) is less than 0.2 eV:

[0352] E HOMO (P B ) - E HOMO (S B ) < 0.2 eV.

[0353] In a preferred embodiment of the present invention, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy EHOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The (energy) difference between ) is greater than 0.0 eV and less than 0.3 eV:

[0354] 0.0 eV < E HOMO (P B ) - E HOMO (S B ) < 0.3 eV.

[0355] In a preferred embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy difference between ) is greater than 0.0 eV and less than 0.3 eV:

[0356] 0.0 eV < E HOMO (P B ) - E HOMO (S B ) < 0.3 eV.

[0357] In a preferred embodiment of the present invention, in each of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) BThe highest occupied molecular orbital of HOMO(S B The energy difference between ) is greater than 0.0 eV and less than 0.3 eV:

[0358] 0.0 eV < E HOMO (P B ) - E HOMO (S B ) < 0.3 eV.

[0359] In a preferred embodiment of the present invention, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The (energy) difference between ) is greater than 0.1 eV and less than or equal to 0.8 eV:

[0360] 0.1 eV ≤ E HOMO (P B ) - E HOMO (S B ) ≤ 0.8 eV.

[0361] In a preferred embodiment of the present invention, in at least one of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy difference between ) is greater than 0.1 eV and less than or equal to 0.8 eV:

[0362] 0.1 eV ≤ EHOMO (P B ) - E HOMO (S B ) ≤ 0.8 eV.

[0363] In a preferred embodiment of the present invention, in each of one or more light-emitting layers B, energy E HOMO (P B At least one, preferably each phosphorescent material P having ) B The highest occupied molecular orbital of HOMO(P B ) and energy E HOMO (S B At least one, preferably each small full width at half maximum (FWHM) emitter S having ) B The highest occupied molecular orbital of HOMO(S B The energy difference between ) is greater than 0.1 eV and less than or equal to 0.8 eV:

[0364] 0.1 eV ≤ E HOMO (P B ) - E HOMO (S B ) ≤ 0.8 eV.

[0365] In a preferred embodiment of the present invention, the following requirements are satisfied:

[0366] (i) Each host material H B is energy E LUMO (H B Lowest unoccupied molecular orbital LUMO(H) having ) B Having )

[0367] (ii) Each phosphorescent material P B is energy E LUMO (P B Lowest unoccupied molecular orbital LUMO(P) having ) B Having )

[0368] (iii) Each small full width at half maximum (FWHM) emitter S B is energy E LUMO (S B Lowest unoccupied molecular orbital LUMO(S) having ) B Having )

[0369] (iv) Each thermally activated delayed fluorescence (TADF) material E B is energy E LUMO (E B Lowest unoccupied molecular orbital LUMO(E) having ) B Having ),

[0370] Here, the relationship expressed by the following equations (12) to (13) is applied:

[0371] E LUMO (E B ) < E LUMO (H B ) (12)

[0372] E LUMO (E B ) < E LUMO (P B ) (13).

[0373] In one embodiment, the aforementioned relationship expressed by equations (12) and (13) applies to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by equations (12) and (13) applies to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0374] In one embodiment of the present invention, an organic electroluminescent device comprises at least one emitting layer B composed of one or more sublayers, wherein one or more sublayers of the emitting layer B comprise the following:

[0375] (i) Energy E LUMO (H B Lowest unoccupied molecular orbital LUMO(H) having ) B Host material H having ) B ; and

[0376] (ii) Energy E LUMO (P B Lowest unoccupied molecular orbital LUMO(P) having ) B Phosphorescent material P having ) B; and

[0377] (iii) Energy E LUMO (S B Lowest unoccupied molecular orbital LUMO(S) having ) B Small full width at half maximum (FWHM) emitter S having ) B ; and

[0378] (iv) Energy E LUMO (E B Lowest unoccupied molecular orbital LUMO(E) having ) B Thermally activated delayed fluorescence (TADF) material E having ) B ,

[0379] Here, the relationship expressed by the following equations (12) to (14) is applied:

[0380] E LUMO (E B ) < E LUMO (H B ) (12)

[0381] E LUMO (E B ) < E LUMO (P B ) (13)

[0382] E LUMO (E B ) < E LUMO (S B ) (14).

[0383] In one embodiment, the aforementioned relationship expressed by formulas (12) to (14) applies to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by formulas (12) to (14) applies to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0384] In one embodiment of the present invention, the relationship expressed by the following formulas (10) to (13) is applied:

[0385] E HOMO (P B ) > EHOMO (H B ) (10)

[0386] E HOMO (P B ) > E HOMO (S B ) (11)

[0387] E LUMO (E B ) < E LUMO (H B ) (12)

[0388] E LUMO (E B ) < E LUMO (P B ) (13).

[0389] In one embodiment, the aforementioned relationship expressed by formulas (10) to (13) is applied to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by formulas (10) to (13) is applied to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0390] In one embodiment of the present invention, the relationship expressed by the following formulas (10) to (14) is applied:

[0391] E HOMO (P B ) > E HOMO (H B ) (10)

[0392] E HOMO (P B ) > E HOMO (S B ) (11)

[0393] E LUMO (E B ) < E LUMO (H B ) (12)

[0394] E LUMO (E B ) < E LUMO (P B ) (13)

[0395] E LUMO (E B ) < E LUMO (S B ) (14).

[0396] In one embodiment, the aforementioned relationship expressed by formulas (10) to (14) is applied to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by formulas (10) to (14) is applied to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0397] In one embodiment of the present invention, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) is at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0398] E LUMO (S B ) > E LUMO (E B ).

[0399] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each, of which energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) is at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E BThe energy is higher than )

[0400] E LUMO (S B ) > E LUMO (E B ).

[0401] In one embodiment of the present invention, in each of at least one light-emitting layer B, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) is at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0402] E LUMO (S B ) > E LUMO (E B ).

[0403] In one embodiment of the present invention, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy difference of ) is less than 0.3 eV:

[0404] E LUMO (S B ) - E LUMO (E B ) < 0.3 eV.

[0405] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each, of which energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy difference of ) is less than 0.3 eV:

[0406] E LUMO (S B ) - E LUMO (E B ) < 0.3 eV.

[0407] In one embodiment of the present invention, in each of at least one light-emitting layer B, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy difference of ) is less than 0.3 eV:

[0408] E LUMO (S B ) - E LUMO (E B ) < 0.3 eV.

[0409] In one embodiment of the present invention, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The (energy) difference of ) is less than 0.2 eV:

[0410] E LUMO (S B ) - E LUMO (E B ) < 0.2 eV.

[0411] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each, of which energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy difference of ) is less than 0.2 eV:

[0412] E LUMO (S B ) - E LUMO (E B ) < 0.2 eV.

[0413] In one embodiment of the present invention, in each of at least one light-emitting layer B, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E BThe energy difference of ) is less than 0.2 eV:

[0414] E LUMO (S B ) - E LUMO (E B ) < 0.2 eV.

[0415] In one embodiment of the present invention, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy difference of ) is greater than 0.0 eV and less than 0.3 eV:

[0416] 0.0 eV < E LUMO (S B ) - E LUMO (E B ) < 0.3 eV.

[0417] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each, of which energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy difference of ) is greater than 0.0 eV and less than 0.3 eV:

[0418] 0.0 eV < E LUMO (S B ) - E LUMO (E B) < 0.3 eV.

[0419] In one embodiment of the present invention, in each of at least one light-emitting layer B, at least one, preferably each, energy E LUMO (S B Small full width at half maximum (FWHM) emitter S having ) B The lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy difference of ) is greater than 0.0 eV and less than 0.3 eV:

[0420] 0.0 eV < E LUMO (S B ) - E LUMO (E B ) < 0.3 eV.

[0421] In one embodiment of the present invention, each energy E LUMO (P B Phosphorescent material P having ) B The lowest unoccupied molecular orbital LUMO(P B ) is the respective energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0422] E LUMO (P B ) > E LUMO (E B ).

[0423] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each, of which energy E LUMO (P B Phosphorescent material P having ) B The lowest unoccupied molecular orbital LUMO(P B) is at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0424] E LUMO (P B ) > E LUMO (E B ).

[0425] In one embodiment of the present invention, in each of at least one light-emitting layer B, at least one, preferably each, energy E LUMO (P B Phosphorescent material P having ) B The lowest unoccupied molecular orbital LUMO(P B ) is at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0426] E LUMO (P B ) > E LUMO (E B ).

[0427] In one embodiment of the present invention, each energy E LUMO (H B Host material H having ) B The lowest unoccupied molecular orbital LUMO(H B ) is the respective energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0428] E LUMO (H B ) > E LUMO (E B ).

[0429] In one embodiment of the present invention, in at least one of one or more light-emitting layers B, at least one, preferably each, of which energy E LUMO (H B Host material H having ) B The lowest unoccupied molecular orbital LUMO(H B ) is at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0430] E LUMO (H B ) > E LUMO (E B ).

[0431] In one embodiment of the present invention, in each of at least one light-emitting layer B, at least one, preferably each, energy E LUMO (H B Host material H having ) B The lowest unoccupied molecular orbital LUMO(H B ) is at least one, preferably each, energy E LUMO (E B TADF material E having ) B The lowest unoccupied molecular orbital LUMO(E B The energy is higher than )

[0432] E LUMO (H B ) > E LUMO (E B ).

[0433] Relationship of emission maxima

[0434] In one embodiment of the present invention, the relationship expressed by equations (16) and (17) is applied:

[0435] |E λmax (P B ) - E λmax (S B )| < 0.30 eV (16),

[0436] |E λmax (E B ) - E λmax (S B )| < 0.30 eV (17),

[0437] This means the following: phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum luminescence energy E λmax (P B Small FWHM emitter S in the context of the present invention, given by ) and electron volts (eV). B The maximum luminescence energy E λmax (S B The energy difference between ) is less than 0.30 eV. And: TADF material E in the context of the present invention given in electron volts (eV). B The maximum luminescence energy E λmax (E B Small FWHM emitter S in the context of the present invention, given by ) and electron volts (eV). B The maximum luminescence energy E λmax (S B The energy difference between ) is less than 0.30 eV.

[0438] In one embodiment, the aforementioned relationship expressed by equations (16) and (17) applies to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by equations (16) and (17) applies to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0439] An organic electroluminescent device comprises at least one light-emitting layer B composed of one or more sublayers, wherein the one or more sublayers are adjacent to each other and collectively comprise:

[0440] (i) at least one host material H B ; and

[0441] (ii) Energy Eλmax (P B Maximum luminescence λ having ) max (P B At least one phosphorescent material P having ) B ; and

[0442] (iii) Energy E λmax (S B Maximum luminescence λ having ) max (S B At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and

[0443] (iv) Energy E λmax (E B Maximum luminescence λ having ) max (E B At least one thermally activated delayed fluorescence (TADF) material E having ) B ,

[0444] One or more sublayers located on the outer surface of the above-mentioned light-emitting layer B are phosphorescent material P B , small FWHM emitter S B and TADF material E B It comprises at least one (emitter) material selected from the group composed of, and the relationship expressed by the following formulas (16) and (17) is applied:

[0445] |E λmax (P B ) - E λmax (S B )| < 0.30 eV (16),

[0446] |E λmax (E B ) - E λmax (S B )| < 0.30 eV (17).

[0447] In a preferred embodiment of the present invention, the relationship expressed by formulas (18) and (19) is applied:

[0448] |E λmax (PB ) - E λmax (S B )| < 0.20 eV (18),

[0449] |E λmax (E B ) - E λmax (S B )| < 0.20 eV (19),

[0450] This means the following: phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum luminescence energy E λmax (P B Small FWHM emitter S in the context of the present invention, given by ) and electron volts (eV). B The maximum luminescence energy E λmax (S B The energy difference between ) is less than 0.20 eV. And: TADF material E in the context of the present invention given in electron volts (eV). B The maximum luminescence energy E λ max (E B Small FWHM emitter S in the context of the present invention, given by ) and electron volts (eV). B The maximum luminescence energy E λmax (S B The energy difference between ) is less than 0.20 eV.

[0451] In one embodiment, the aforementioned relationship expressed by formulas (18) and (19) applies to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by formulas (18) and (19) applies to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0452] One embodiment of the present invention relates to an organic electroluminescent device, wherein

[0453] (ii) at least one phosphorescent material P B is energy Eλmax (P B Maximum luminescence λ having ) max (P B Having ); and

[0454] (iii) at least one small full width at half maximum (FWHM) emitter S B is energy E λmax (S B Maximum luminescence λ having ) max (S B With ), here S B emits light having a full width at half maximum (FWHM) of 0.25 eV or less; and

[0455] (iv) at least one thermally activated delayed fluorescence (TADF) material E B is energy E λmax (E B Maximum luminescence λ having ) max (E B Having ),

[0456] Here, (18) and (19) apply:

[0457] |E λmax (P B ) - E λmax (S B )| < 0.20 eV (18),

[0458] |E λmax (E B ) - E λmax (S B )| < 0.20 eV (19).

[0459] In a more preferred embodiment of the present invention, the relationship expressed by formulas (20) and (21) is applied:

[0460] |E λmax (P B ) - E λmax (S B )| < 0.1 eV (20),

[0461] |E λmax (E B ) - E λmax (S B )| < 0.10 eV (21),

[0462] This means the following: phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum luminescence energy E λmax (P B Small FWHM emitter S in the context of the present invention, given by ) and electron volts (eV). B The maximum luminescence energy E λmax (S B The energy difference between ) is less than 0.10 eV. And: TADF material E in the context of the present invention given in electron volts (eV). B The maximum luminescence energy E λmax (E B Small FWHM emitter S in the context of the present invention, given by ) and electron volts (eV). B The maximum luminescence energy E λmax (S B The energy difference between ) is less than 0.10 eV.

[0463] In one embodiment, the aforementioned relationship expressed by equations (20) and (21) applies to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by equations (20) and (21) applies to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[0464] In one embodiment of the present invention, the relationship expressed by Equation (22) is applied:

[0465] E λmax (P B ) > E λmax (S B ) (22),

[0466] This is a phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum luminescence energy E λ max (P B) is a small FWHM emitter S in the context of the present invention given in electron volts (eV). B The maximum luminescence energy E λmax (S B It means that it is greater than ).

[0467] In one embodiment, the aforementioned relationship expressed by Equation (22) applies to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by Equation (22) applies to a material included in the same light-emitting layer B of the organic electroluminescent device according to the present invention.

[0468] In one embodiment of the present invention, the relationship expressed by Equation (22-a) is applied:

[0469] E λmax (E B ) > E λmax (S B ) (22-a),

[0470] This is TADF material E in the context of the present invention given in electron volts (eV). B The maximum luminescence energy E λmax (E B ) is a small FWHM emitter S in the context of the present invention given in electron volts (eV). B The maximum luminescence energy E λmax (S B It means that it is greater than ).

[0471] In one embodiment, the aforementioned relationship expressed by Equation (22-a) applies to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by Equation (22-a) applies to a material included in the same light-emitting layer B of the organic electroluminescent device according to the present invention.

[0472] Device color and performance

[0473] Further embodiments of the present invention relate to an electroluminescent device (e.g., OLED) that emits light from a distinct color point. According to the present invention, the electroluminescent device (e.g., OLED) emits light with a narrow emission band (small full width at half maximum (FWHM)). In a preferred embodiment, the electroluminescent device (e.g., OLED) according to the present invention emits light with a FWHM of the main emission peak of less than 0.25 eV, more preferably less than 0.20 eV, even more preferably less than 0.15 eV, or even less than 0.13 eV.

[0474] An additional embodiment of the present invention is 1000 cd / m 2 The invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, more preferably more than 18% or even more than 20% at (nit), and exhibits maximum luminescence at 500 nm to 560 nm.

[0475] An additional embodiment of the present invention is 1000 cd / m 2 The invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, more preferably more than 18% or even more than 20%, and exhibits maximum luminescence at 510 nm to 550 nm.

[0476] An additional embodiment of the present invention is 1000 cd / m 2 The invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, more preferably more than 18% or even more than 20%, and exhibits maximum luminescence at 515 nm to 540 nm.

[0477] In a preferred embodiment, the electroluminescent device (e.g., OLED) has a constant current density J0 = 15 mA / cm² 2 It indicates an LT95 value of more than 100 hours, preferably more than 200 hours, more preferably more than 300 hours, more preferably more than 400 hours, more preferably more than 750 hours, or even more than 1000 hours.

[0478] Further embodiments of the present invention relate to an electroluminescent device (e.g., OLED) that emits light from distinct color spots. According to the present invention, the electroluminescent device (e.g., OLED) emits light having a narrow emission band (small full width at half maximum (FWHM)). In a preferred embodiment, the electroluminescent device (e.g., OLED) according to the present invention emits light having a FWHM of the main emission peak of less than 0.25 eV, more preferably less than 0.20 eV, even more preferably less than 0.15 eV, or even less than 0.13 eV.

[0479] Further embodiments of the present invention relate to an electroluminescent device (e.g., OLED) that emits light having CIEx and CIEy color coordinates close to the CIEx (= 0.170) and CIEy (= 0.797) color coordinates of primary green (CIEx = 0.170 and CIEy = 0.797) as defined in ITU-R Recommendation BT.2020 (Rec. 2020), and thus is suitable for use in ultra-high definition (UHD) displays, e.g., UHD-TVs. In this paragraph, the term “close” refers to the range of CIEx and CIEy coordinates provided at the end of this paragraph. In commercial applications, top-emitting devices (where the top electrode is typically transparent) are typically used, whereas the test devices used throughout this invention represent bottom-emitting devices (where the bottom electrode and substrate are transparent). Accordingly, a further aspect of the present invention relates to an electroluminescent element (e.g., OLED) that emits light in CIEx color coordinates of 0.15 to 0.45, preferably 0.15 to 0.35, more preferably 0.15 to 0.30, more preferably 0.15 to 0.25 or even 0.15 to 0.20 and / or CIEy color coordinates of 0.60 to 0.92, preferably 0.65 to 0.90, more preferably 0.70 to 0.88, more preferably 0.75 to 0.86 or even 0.79 to 0.84.

[0480] Further embodiments of the present invention relate to OLEDs emitting light at CIEx and CIEy color coordinates close to the CIEx (= 0.265) and CIEy (= 0.65) color coordinates of primary green (CIEx = 0.265 and CIEy = 0.65) as defined in DCIP3. In this paragraph, the term “close” refers to the range of CIEx and CIEy coordinates provided at the end of this paragraph. In commercial applications, top-emitting devices (where the top electrode is typically transparent) are typically used, whereas the test devices used throughout this application represent bottom-emitting devices (where the bottom electrode and substrate are transparent). A further aspect of the present invention relates to an OLED in which the lower emission exhibits CIEx color coordinates of 0.2 to 0.45, preferably 0.2 to 0.35, more preferably 0.2 to 0.30, more preferably 0.24 to 0.28 or even 0.25 to 0.27 and / or CIEy color coordinates of 0.60 to 0.9, preferably 0.6 to 0.8, more preferably 0.60 to 0.70, more preferably 0.62 to 0.68 or even 0.64 to 0.66.

[0481] An additional embodiment of the present invention is 1000 cd / m 2 The invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, more preferably more than 18% or even more than 20%, and exhibits maximum luminescence at 420 nm to 500 nm.

[0482] An additional embodiment of the present invention is 1000 cd / m 2The invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, more preferably more than 18% or even more than 20%, and exhibits maximum luminescence at 440 nm to 480 nm.

[0483] An additional embodiment of the present invention is 1000 cd / m 2 The invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, more preferably more than 18% or even more than 20%, and exhibits maximum luminescence at 450 nm to 470 nm.

[0484] An additional embodiment of the present invention is 1000 cd / m 2 Exhibiting an external quantum efficiency of greater than 10%, more preferably greater than 13%, more preferably greater than 15%, even more preferably greater than 18% or even greater than 20%, and exhibiting a maximum luminescence of 420 nm to 500 nm, preferably 430 nm to 490 nm, more preferably 440 nm to 480 nm, and more preferably 450 nm to 470 nm, or 500 cd / m² 2 The invention relates to an electroluminescent device (e.g., OLED) exhibiting an LT80 value of greater than 100 h, preferably greater than 200 h, more preferably greater than 400 h, more preferably greater than 750 h, or even greater than 1000 h.

[0485] Further embodiments of the present invention relate to an electroluminescent device (e.g., OLED) that emits light from distinct color spots. According to the present invention, the electroluminescent device (e.g., OLED) emits light having a narrow emission band (small full width at half maximum (FWHM)). In a preferred embodiment, the electroluminescent device (e.g., OLED) according to the present invention emits light having a FWHM of the main emission peak of less than 0.25 eV, more preferably less than 0.20 eV, even more preferably less than 0.15 eV, or even less than 0.13 eV.

[0486] Further embodiments of the present invention relate to an electroluminescent device (e.g., OLED) that emits light having CIEx and CIEy color coordinates close to the CIEx (= 0.131) and CIEy (= 0.046) color coordinates of primary blue (CIEx = 0.131 and CIEy = 0.046) as defined in ITU-R Recommendation BT.2020 (Rec. 2020), and thus is suitable for use in ultra-high definition (UHD) displays, e.g., UHD-TVs. In this paragraph, the term “close” refers to the range of CIEx and CIEy coordinates provided at the end of this paragraph. In commercial applications, top-emitting devices (where the top electrode is typically transparent) are typically used, whereas the test devices used throughout this invention represent bottom-emitting devices (where the bottom electrode and substrate are transparent). The CIEy color coordinates of a blue element can decrease by up to twofold when changing from a bottom-emitting element to a top-emitting element, but CIEx remains almost unchanged (Okinaka et al., Society for Information Display International Symposium Symposium Digest of Technical Papers, 2015, 46(1):312-313, DOI:10.1002 / sdtp.10480). Accordingly, a further aspect of the present invention relates to an OLED that emits light in CIEx color coordinates of 0.02 to 0.30, preferably 0.03 to 0.25, more preferably 0.05 to 0.20, more preferably 0.08 to 0.18 or even 0.10 to 0.15 and / or CIEy color coordinates of 0.00 to 0.45, preferably 0.01 to 0.30, more preferably 0.02 to 0.20, more preferably 0.03 to 0.15 or even 0.04 to 0.10.

[0487] An additional embodiment of the present invention is 1000 cd / m 2Exhibiting an external quantum efficiency of greater than 8%, more preferably greater than 10%, more preferably greater than 13%, more preferably greater than 15%, or even greater than 20%, or exhibiting / exhibiting a maximum luminescence of 590 nm to 690 nm, preferably 610 nm to 665 nm, more preferably 620 nm to 640 nm, or 500 cd / m² 2 The present invention relates to an electroluminescent device (e.g., OLED) exhibiting an LT80 value greater than 100 h, preferably greater than 200 h, more preferably greater than 400 h, even more preferably greater than 750 h, or even greater than 1000 h. Accordingly, a further aspect of the present invention relates to an OLED exhibiting a CIEy color coordinate greater than 0.25, preferably greater than 0.27, more preferably greater than 0.29, or even more preferably greater than 0.30.

[0488] Further embodiments of the present invention relate to an electroluminescent device (e.g., OLED) that emits light having CIEx and CIEy color coordinates close to the CIEx (= 0.708) and CIEy (= 0.292) color coordinates of primary blue (CIEx = 0.708 and CIEy = 0.292) as defined in ITU-R Recommendation BT.2020 (Rec. 2020), and is therefore suitable for use in ultra-high definition (UHD) displays, e.g., UHD-TVs. In this paragraph, the term “close” refers to the range of CIEx and CIEy coordinates provided at the end of this paragraph. In commercial applications, top-emitting devices (where the top electrode is typically transparent) are typically used, whereas the test devices used throughout this invention represent bottom-emitting devices (where the bottom electrode and substrate are transparent). Accordingly, a further aspect of the present invention relates to an OLED that emits light in CIEx color coordinates of 0.60 to 0.88, preferably 0.61 to 0.83, more preferably 0.63 to 0.78, more preferably 0.66 to 0.76 or even 0.68 to 0.73 and / or CIEy color coordinates of 0.25 to 0.70, preferably 0.26 to 0.55, more preferably 0.27 to 0.45, more preferably 0.28 to 0.40 or even 0.29 to 0.35.

[0489] Accordingly, an additional aspect of the present invention is 14,500 cd / m 2 The invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, more preferably more than 17%, or even more than 20%, or exhibits maximum luminescence at 590 nm to 690 nm, preferably 610 nm to 665 nm, more preferably 620 nm to 640 nm.

[0490] One of the purposes of interest for an organic electroluminescent device may be the generation of light. Accordingly, the present invention also relates to a method for generating light in a desired wavelength range, comprising the step of providing any organic electroluminescent device according to the present invention.

[0491] Accordingly, an additional aspect of the present invention relates to a method for generating light of a desired wavelength range, comprising the following steps:

[0492] (i) a step of providing an organic electroluminescent device according to the present invention; and

[0493] (ii) A step of applying current to the organic electroluminescent device.

[0494] A further aspect of the present invention relates to a method for manufacturing an organic electroluminescent device by configuring the aforementioned elements. The present invention also relates particularly to a method for generating green light by using said organic electroluminescent device.

[0495] A further aspect of the present invention relates to an organic electroluminescent device in which (at least) one, preferably exactly one, of the relationships expressed by the following formulas (23) to (25) is applied to a material included in the same light-emitting layer B:

[0496] 440nm < λ max (S B ) < 470nm (23)

[0497] 510nm < λ max (S B ) < 550nm (24)

[0498] 610nm < λ max (S B ) < 665nm (25),

[0499] Here, λ max (S B ) is at least one, preferably each small FWHM emitter S B It is the maximum luminescence and is given in nanometers (nm).

[0500] In one embodiment of the present invention, at least one, preferably exactly one, of the relationships expressed by the following formulas (23) to (25) is applied to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent device according to the present invention.

[0501] A further aspect of the present invention relates to a method for generating light comprising the following steps:

[0502] (i) a step of providing an organic electroluminescent device according to the present invention; and

[0503] (ii) A step of applying current to the organic electroluminescent device.

[0504] A further aspect of the present invention relates to a method for generating light comprising the following steps:

[0505] (i) a step of providing an organic electroluminescent device according to the present invention; and

[0506] (ii) a step of applying current to the organic electroluminescent device,

[0507] Here, the above method is intended to generate light in a wavelength range selected from one of the following wavelength ranges:

[0508] (i) 510 nm to 550 nm, or

[0509] (ii) 440 nm to 470 nm, or

[0510] (iii) 610 nm to 665 nm.

[0511] A skilled technician must use at least one TADF material E B and at least one phosphorescent material P B It is understood that (see below) can be used as an emitter in an organic electroluminescent device. However, preferably, in an organic electroluminescent device according to the present invention, at least one TADF material E B and at least one phosphorescent material P BThe primary function of is not to emit light. In a preferred embodiment, when voltage (and current) is applied, the organic electroluminescent device according to the present invention emits light, and this light emission is mainly (i.e., to an extent greater than 50%, preferably greater than 60%, or preferably greater than 70%, more preferably greater than 80%, or even greater than 90%) at least one small FWHM emitter (S B It is attributed to fluorescence emitted by ). Consequently, the organic electroluminescent device according to the present invention preferably also exhibits narrow emission, expressed by a small FWHM of the main emission peak, less than 0.25 eV, more preferably less than 0.20 eV, even more preferably less than 0.15 eV or even less than 0.13 eV.

[0512] In a preferred embodiment of the present invention, the relationship expressed by the following formula (26) is applied:

[0513] (26),

[0514] Here

[0515] FWHM D represents the full width at half maximum (FWHM) in electron volts (eV) of the principal emission peak of the organic electroluminescent device according to the present invention; and

[0516] FWHM SB FWHM D One or more host materials H used in the light-emitting layer (EML) of an organic electroluminescent device having a FWHM B One or more small FWHM emitters S within B Represents the FWHM in electron volts (eV) of the photoluminescence spectrum of the spin-coated film (fluorescence spectrum measured at room temperature, i.e., (approximately) 20°C). In other words, FWHM SB The spin coating film to which is determined is preferably an emitter or emitter S with the same small FWHM in the same weight ratio as the emissive layer B of the organic electroluminescent device. BIncludes

[0517] For example, two types of small FWHM emitters S, each having a concentration of 1 wt% of emissive layer B. B In the case of including, the spin coating film preferably also contains 1 weight% each of two types of small FWHM emitters S B It includes. In this exemplary case, the matrix material of the spin coating film will amount to 98 weight percent of the spin coating film. The matrix material of such a spin coating film is a host material (H) included in the light-emitting layer (B) of the organic electroluminescent device. B It can be selected to reflect the weight ratio of ). In the above example, the light-emitting layer B is a single host material H B If it includes, this host material will preferably be the only matrix material of the spin coating film. However, in the example described above, the emissive layer B is two types of host materials H B In the case of including, where one has a content of 60 wt% and the other has a content of 20 wt% (i.e., a ratio of 3:1), the spin coating film (two types of small FWHM emitters S, each 1 wt%) B The aforementioned matrix material (including) is preferably two types of host materials H present in the EML. B It will be a 3:1 mixture.

[0518] When the organic electroluminescent device according to the present invention includes more than one light-emitting layer B, the relationship represented by Equation (26) preferably applies to all light-emitting layers B included in the device.

[0519] In one embodiment, with respect to at least one light-emitting layer B of the organic electroluminescent device according to the present invention, the aforementioned FWHM D : FWHM SB The ratio is 1.50 or less, preferably 1.40 or less, more preferably 1.30, even more preferably 1.20, or even 1.10.

[0520] In one embodiment, for each light-emitting layer B of the organic electroluminescent device according to the present invention, the aforementioned FWHM D : FWHM SB The ratio is 1.50 or less, preferably 1.40 or less, more preferably 1.30, even more preferably 1.20, or even 1.10.

[0521] Small FWHM emitter S in the context of the present invention B For the selection of a fluorescent emitter to be used as, it should be noted that the FWHM value may be determined as described in the sub-chapter following this text (briefly: preferably from spin-coated films or solutions of each emitter in poly(methyl methacrylate) PMMA having a concentration of 1-5 wt%, particularly 2 wt%, see below). That is, the exemplary small FWHM emitters S listed in Table 1S B The FWHM value of is the FWHM in the context of Equation (26) and related preferred embodiments of the present invention. SB It may not be understood as a value.

[0522] Examples and claims further explain the present invention.

[0523] Host material H B

[0524] According to the present invention, any one or more host materials (H) included in any at least one light-emitting layer (B) B ) is p-host H exhibiting high hole mobility P , n-host H exhibiting high electron mobility N , or bipolar host material H exhibiting both high hole mobility and high electron mobility BP It could be.

[0525] n-host H exhibiting high electron mobility in the context of the present invention N is preferably -2.50 eV or less (E LUMO (HN ) ≤ -2.50 eV), preferably E LUMO (H N ) ≤ -2.60 eV, more preferably E LUMO (H N ) ≤ -2.65 eV, more preferably E LUMO (H N LUMO energy E of ) ≤ -2.70 eV LUMO (H N It has ). The LUMO is the lowest unoccupied molecular orbital. The energy of the LUMO is determined as described in the sub-chapter following this text.

[0526] p-host H exhibiting high hole mobility in the context of the present invention P is preferably -6.30 eV or higher (E HOMO (H P ) ≥ -6.30 eV), preferably E HOMO (H P ) ≥ -5.90 eV, more preferably E HOMO (H P ) ≥ -5.70 eV, more preferably E HOMO (H P ) ≥ -5.40 eV or even E HOMO (H P HOMO energy E of ) ≥ -2.60 eV HOMO (H P It has ). The HOMO is the highest occupied molecular orbital. The energy of the HOMO is determined as described in the sub-chapter following this text.

[0527] In one embodiment of the present invention, each host material H B is -6.30 eV or higher (E HOMO (H P ) ≥ -6.30 eV), preferably E HOMO (H P ) ≥ -5.90 eV, more preferably EHOMO (H P ) ≥ -5.70 eV, more preferably E HOMO (H P HOMO energy E of ) ≥ -5.40 eV HOMO (H P p-host H having ) P HOMO is the highest-occupied molecular orbital. The energy of the HOMO is determined as described in the sub-chapter following this text.

[0528] In one embodiment of the present invention, at least one, preferably each p-host H P is a HOMO energy E smaller than -5.60 eV HOMO (H P has ).

[0529] In one embodiment of the present invention, an organic electroluminescent device comprises at least one light-emitting layer B composed of one or more sublayers, wherein the one or more sublayers are adjacent to each other and collectively comprise:

[0530] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ;

[0531] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0532] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; and optionally

[0533] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B ,

[0534] Here, one or more sublayers located on the outer surface of the light-emitting layer B are phosphorescent material P B , small FWHM emitter (S B ) and TADF material E B It comprises at least one (emitter) material selected from the group consisting of,

[0535] Here, at least one host material H B is an energy E smaller than -5.60 eV HOMO (H B HOMO(H) with the highest occupied molecular orbital B Having ), preferably each host material H B is an energy E smaller than -5.60 eV HOMO (H B HOMO(H) with the highest occupied molecular orbital B has ).

[0536] In the context of the present invention, a bipolar host exhibiting high electron mobility is preferably -2.50 eV or less (E LUMO (H BP LUMO energy E of ) ≤ -2.50 eV) LUMO (H BP It has ). Preferably E LUMO (H BP ) ≤ -2.60 eV, and more preferably E LUMO (H BP ) ≤ -2.65 eV, and more preferably E LUMO (H BP ) ≤ -2.70 eV. The LUMO is the lowest unoccupied molecular orbital. The energy of the LUMO is determined as described in the sub-chapter following this text.

[0537] In the context of the present invention, a bipolar host exhibiting high hole mobility is preferably -6.30 eV or higher (E HOMO (H BP ) ≥ -6.30 eV), preferably E HOMO (H BP HOMO energy E greater than ) ≥ -5.90 eV HOMO (H BP It has ). More preferably E HOMO (H BP ) ≥ -5.70 eV, and more preferably E HOMO (H BP ) ≥ -5.40 eV. The HOMO is the most occupied molecular orbital. The energy of the HOMO is determined as described in the sub-chapter following this text.

[0538] In one embodiment of the present invention, a bipolar host material H BP , preferably each bipolar host material H BP satisfies all of the following requirements:

[0539] (i) -2.50 eV or less (E LUMO (H BP ) ≤ -2.50 eV) LUMO energy E LUMO (H BP It has ). Preferably E LUMO (H BP ) ≤ -2.60 eV, and more preferably E LUMO (H BP ) ≤ -2.65 eV, and more preferably E LUMO (H BP ) ≤ -2.70 eV. The LUMO is the lowest unoccupied molecular orbital. The energy of the LUMO is determined as described in the sub-chapter following this text.

[0540] (ii) -6.30 eV or greater (E HOMO (H BP ) ≥ -6.30 eV), preferably E HOMO (H BPHOMO energy E of ) ≥ -5.90 eV HOMO (H BP It has ). More preferably E HOMO (H BP ) ≥ -5.70 eV, and more preferably E HOMO (H BP ) ≥ -5.40 eV. The HOMO is the most occupied molecular orbital. The energy of the HOMO is determined as described in the sub-chapter following this text.

[0541] Those skilled in the art know which materials are suitable host materials for use in organic electroluminescent devices such as those of the present invention. Refer to the example below: Y.Tao, C. Yang, J. Quin, Chemical Society Reviews 2011 , 40 , 2943, DOI: 10.1039 / C0CS00160K; KS Yook, JY Lee, The Chemical Record 2015 , 16 (1), 159, DOI: 10.1002 / tcr.201500221; T. Chatterjee, K.-T. Wong, Advanced Optical Materials 2018 , 7 (1), 1800565, DOI: 10.1002 / adom.201800565;

[0542] Q.Wang, Q.-S. Tian, ​​Y.-L. Zhang, X. Tang, L.-S. Liao, Journal of Materials Chemistry C 2019 , 7 , 11329, DOI: 10.1039 / C9TC03092A.

[0543] Also, for example, US2006006365 (A1), US2006208221 (A1), US2005069729 (A1), EP1205527 (A1), US2009302752 (A1), US20090134784 (A1), US2009302742 (A1), US2010187977 (A1), US2010187977 (A1), US2012068170 (A1), US2012097899 (A1), US2006121308 (A1), US2006121308 (A1), US2009167166 (A1), US2007176147 (A1), US2015322091 (A1), US2011105778 (A1), US2011201778 (A1), US2011121274 (A1), US2009302742 (A1), US2010187977 (A1), US2010244009 (A1), US2009136779 (A1), EP2182040 (A2), US2012202997 (A1), US2019393424 (A1), US2019393425 (A1), US2020168819 (A1), US2020079762 (A1), and US2012292576 (A1) disclose a host material that can be used in an organic electroluminescent device according to the present invention. It is understood that this does not imply that the present invention is limited to organic electroluminescent devices comprising the host materials disclosed in the cited references. Furthermore, any host material used in the latest technology is also a suitable host material H in the context of the present invention. B It is understood that this could be the case.

[0544] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent device according to the present invention is one or more p-host H P Includes. In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent device according to the present invention comprises only a single host material, and the host material is a p-host H P am.

[0545] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent device according to the present invention is one or more n-host H N ...includes. In another embodiment of the present invention, each light-emitting layer B of the organic electroluminescent device according to the present invention comprises only a single host material, and this host material is an n-host H N am.

[0546] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent device according to the present invention is one or more bipolar host H BP Includes. In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent device according to the present invention comprises only a single host material, and this host material is a bipolar host H BP am.

[0547] In another embodiment of the present invention, at least one light-emitting layer B of an organic electroluminescent device according to the present invention comprises at least two different host materials. In this case, one or more host materials H present in each light-emitting layer B. B are all p-host H P Either or all n-host H N Either or both are bipolar host H BP It could be, but it could also be a combination of these.

[0548] When an organic electroluminescent device according to the present invention comprises more than one light-emitting layer B, any one of them is independently of one or more other light-emitting layers B, a host material H to which the above-mentioned definition applies B or more than one host material H B It is understood that it may include. In addition, it is understood that the different light-emitting layers B included in the organic electroluminescent device according to the present invention do not necessarily all include the same material or even the same material of the same concentration.

[0549] When the light-emitting layer B of the organic electroluminescent device according to the present invention is composed of more than one sublayer, any one of these is independently of one or more other sublayers, a host material H to which the above-mentioned definition applies B or more than one host material H B It is understood that it may include. In addition, it is understood that different sublayers of the light-emitting layer B included in the organic electroluminescent device according to the present invention do not necessarily all include the same material or even the same material of the same concentration.

[0550] When included in the same light-emitting layer B of the organic electroluminescent device according to the present invention, at least one p-host H P and at least one n-host H N ... can optionally form an exciplex. Those skilled in the art know that H forming an exciplex P and H N Method for selecting pairs of and H P and H N Selection criteria including the HOMO- and / or LUMO- energy level requirements are known. That is, p-host material H where exciplex formation may be required. P The highest occupied molecular orbital (HOMO) of the n-host material H N The energy can be at least 0.20 eV higher than the HOMO, and the p-host material H P The lowest unoccupied molecular orbital (LUMO) of the n-host material H N The energy can be at least 0.20 eV higher than the LUMO.

[0551] In a preferred embodiment of the present invention, at least one host material H B (For example, H P , H N , and / or H BP) is an organic host material, which means that in the context of the present invention, it does not contain any transition metal. In a preferred embodiment of the present invention, all host materials H of the electroluminescent device of the present invention B (H P , H N and / or H BP ) is an organic host material, which means that, in the context of the present invention, they do not contain any transition metals. Preferably, at least one host material H B , more preferably all host material H B (H P , H N and / or H BP It is mainly composed of hydrogen (H), carbon (C), and nitrogen (N) elements, but may also include, for example, oxygen (O), boron (B), silicon (Si), fluorine (F), and bromine (Br).

[0552] In one embodiment of the present invention, each host material H B is p-host H P am.

[0553] In a preferred embodiment of the present invention, a p-host H is optionally included in any at least one light-emitting layer B (composed of one (sub)layer or comprising one or more sublayers) as a whole. P ... includes or consists of:

[0554] - Chemical formula H P -I, H P -II, H P -III, H P -IV, H P -V, H P -VI, H P -VII, H P -VIII, H P -IX and H P - A first chemical moiety comprising or composed of a structure according to any one of X:

[0555]

[0556] Chemical formula H P -I Chemical formula H P -II Chemical Formula H P -III Chemical Formula H P -IV

[0557]

[0558] Chemical formula H P -V Chemical formula H P -VI Chemical formula H P -VII

[0559]

[0560] Chemical formula H P -VIII Chemical Formula H P -IX Chemical Formula H P -X

[0561] and

[0562] - Each chemical formula H P -XI, H P -XII, H P -XIII, H P -XIV, H P -XV, H P -XVI, H P -XVII, H P -XVIII and H P One or more second chemical moiety comprising or composed of a structure according to any one of -XIX:

[0564]

[0565] Chemical formula H P -XI Chemical formula H P -XII Chemical Formula H P -XIII

[0566]

[0567] Chemical formula H P -XIV Chemical Formula H P -XV Chemical Formula H P -XVI

[0568]

[0569] Chemical formula H P -XVII Chemical Formula H P -XVIII Chemical Formula H P -XIX,

[0570] Here, p-host material H P Each of at least one second chemical moiety present in is connected to the first chemical moiety through a single bond indicated by a dotted line in the above chemical formula;

[0571] Here

[0572] Z 1 In each case, they directly combine independently of each other, C(R II )2, C=C(R II )2, C=O, C=NR II , NR II , O, Si(R II Selected from the group consisting of )2, S, S(O) and S(O)2;

[0573] R I In each case, it is a single bonding site that independently connects the first chemical moiety to the second chemical moiety, or hydrogen, deuterium, Me, i Pr and t Bu, and

[0574] Me, i Pr, t Ph selectively substituted with one or more independent substituents selected from the group consisting of Bu and Ph;

[0575] Selected from a group composed of,

[0576] Here, at least one R I is a bonding site of a single bond connecting the first chemical moiety to the second chemical moiety;

[0577] R II is hydrogen, deuterium, Me, i Pr, t Bu, and

[0578] Me, i Pr,t Ph selectively substituted with one or more independent substituents selected from the group consisting of Bu and Ph;

[0579] Selected from a group composed of,

[0580] Here, two or more adjacent substituents R II is optionally formed into an aliphatic, aromatic, or heteroaromatic, carbocyclic, or heterocyclic ring system, with the chemical formula H P -XI, H P -XII, H P -XIII, H P -XIV, H P -XV, H P -XVI, H P -XVII, H P -XVIII, and H P Not only the structure according to any one of -XIX, but also the adjacent substituent R II A fused ring system consisting of additional rings selectively formed by may include a total of 12 to 60 carbon atoms, preferably 14 to 32 carbon atoms.

[0581] In a more preferred embodiment of the present invention, Z 1 In each case, it is a direct bond, and the adjacent substituent R II It does not combine to form an additional ring system.

[0582] In a more preferred embodiment of the present invention, a p-host H optionally included in the organic electroluminescent device according to the present invention P is selected from a group consisting of the following structures:

[0583]

[0584]

[0585]

[0586]

[0587]

[0588]

[0589] In a preferred embodiment of the present invention, an n-host H is optionally included in any at least one light-emitting layer B as a whole (composed of one (sub)layer or comprising one or more sublayers). N is the chemical formula H N -I, H N -II and H N -It may include or be composed of a structure according to any one of -III:

[0590]

[0591] Chemical formula H N -I Chemical formula H N -II Chemical Formula H N -III,

[0592] Here, R III and R IV In each case, independently of each other, hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3,

[0593] Me, i Pr, t Ph selectively substituted with one or more mutually independent substituents selected from the group consisting of Bu and Ph; and

[0594] Chemical formula H N -IV, H N -V, H N -VI, H N -VII, H N -VIII, H N -IX, H N -X, H N -XI, H N -XII, H N -XIII and H N - A structure represented by any one of XIVs;

[0595] Selected from a group composed of,

[0596]

[0597] Chemical formula H N -IV Chemical formula H N -V Chemical formula H N -VI

[0598]

[0599] Chemical formula H N -VII Chemical Formula H N -VIII Chemical Formula H N -IX

[0600]

[0601] Chemical formula H N -X Chemical formula H N -XI Chemical formula H N -XII

[0602]

[0603] Chemical formula H N -XIII Chemical Formula H N -XIV,

[0604] Here

[0605] The dotted line represents the chemical formula H N -IV, H N -V, H N -VI, H N -VII, H N -VIII, H N -IX, H N -X, H N -XI, H N -XII, H N -XIII, and H N H structure according to any one of -XIV N -I, H N -II, and H N -It indicates the bonding site of a single bond connecting to a structure according to any one of -III;

[0606] X 1 It is oxygen (O), sulfur (S), or C (R V )2 and;

[0607] R VIn each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu and

[0608] Me, i Pr, t Ph selectively substituted with one or more independent substituents selected from the group consisting of Bu and Ph;

[0609] Selected from a group composed of;

[0610] Here, two or more adjacent substituents R V is optionally formed into an aliphatic, aromatic, or heteroaromatic, carbocyclic, or heterocyclic ring system, with the chemical formula H N -IV, H N -V, H N -VI, H N -VII, H N -VIII, H N -IX, H N -X, H N -XI, H N -XII, H N -XIII, and H N Not only the structure according to any one of -XIV, but also the adjacent substituent R V A fused ring system comprising an additional ring selectively formed by comprises a total of 8 to 60 carbon atoms, preferably 12 to 40 carbon atoms, more preferably 14 to 32 carbon atoms;

[0611] Here, the chemical formula H N -I and H N In -II, at least one substituent R III is CN.

[0612] In a more preferred embodiment of the present invention, an n-host H optionally included in the organic electroluminescent device according to the present invention N is selected from a group consisting of the following structures:

[0613]

[0614] In one embodiment of the present invention, an n-host H included in any light-emitting layer B of an organic electroluminescent device according to the present invention N It does not contain any phosphine oxide groups, and in particular, n-host H N It is not bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO).

[0615] TADF Material E B

[0616] According to the present invention, a thermally activated delayed fluorescence (TADF) material E B is a lowest excited singlet state energy level E(S1) of less than 0.4 eV, preferably less than 0.3 eV, more preferably less than 0.2 eV, even more preferably less than 0.1 eV, or even less than 0.05 eV. E ) and the lowest excited triplet state energy level E(T1 E ΔE corresponding to the energy difference of ) ST It is characterized by representing a value. Accordingly, TADF material E according to the present invention B ΔE ST is the lowest excited triplet state T1 at room temperature (RT, i.e., (approx.) 20°C). E From the lowest excitation singlet state S1 E It can be small enough to allow thermal repopulation (also called upward term crossing or reverse term crossing, RISC).

[0617] Preferably, in the context of the present invention, the TADF material is luminescent S1 by the recombination of charge carriers (holes and electrons). E Immediate fluorescence and T1 when reaching the state E Luminescent S1 through thermally activated RISC from the state E It exhibits both delayed fluorescence when reaching the state.

[0618] Small FWHM emitter S included in the light-emitting layer B of the organic electroluminescent device according to the present invention B is optionally also ΔE less than 0.4 eV ST It is understood that it can have a value and can exhibit thermally activated delayed fluorescence (TADF). However, any small FWHM emitter S in the context of the present invention B Regarding this, this is merely an optional feature.

[0619] In a preferred embodiment of the present invention, at least one TADF material E B The emission spectrum of and at least one small FWHM emitter S B There is spectral overlap between the absorption spectra (when both spectra are measured under similar conditions). In this case, at least one TADF material E B is at least one small FWHM emitter S B It can transfer energy to.

[0620] According to the present invention, TADF material E B It exhibits maximum luminescence in the visible wavelength range of 380 nm to 800 nm, and typically 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approx.) 20°C). B It is measured as.

[0622] In one embodiment of the present invention, each TADF material E B has maximum luminescence in the deep blue wavelength range of 380 nm to 470 nm, preferably 400 nm to 470 nm, and typically 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approx.) 20°C). B It is measured as.

[0623] In one embodiment of the present invention, each TADF material E Bhas maximum luminescence in the green wavelength range of 480 nm to 560 nm, preferably 500 nm to 560 nm, and typically 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approx.) 20°C). B It is measured as.

[0624] In one embodiment of the present invention, each TADF material E B is a TADF material E of 10 wt% in poly(methyl methacrylate) PMMA that has maximum luminescence in the red wavelength range of 600 nm to 665 nm, preferably 610 nm to 665 nm, and typically at room temperature (i.e., (approximately) 20°C). B It is measured as. In a preferred embodiment of the present invention, TADF material E B The maximum luminescence (peak luminescence) of is a small FWHM emitter S in the context of the present invention. B It is at a shorter wavelength than the maximum emission (peak emission).

[0625] In a preferred embodiment of the present invention, each TADF material E B is an organic TADF material, which means that, in the context of the present invention, it does not contain any transition metals. Preferably, each TADF material E according to the present invention B It is mainly composed of hydrogen (H), carbon (C), and nitrogen (N) elements, but may also include, for example, oxygen (O), boron (B), silicon (Si), fluorine (F), and bromine (Br).

[0626] In a preferred embodiment of the present invention, each TADF material E B It has a molecular weight of 800 g / mol or less.

[0627] In one embodiment of the present invention, TADF emitter E BIt exhibits a photoluminescence quantum yield (PLQY) of 30% or more, and typically 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approx.) 20°C). B It is measured as.

[0628] In one embodiment of the present invention, TADF emitter E B It exhibits a photoluminescence quantum yield (PLQY) of 50% or more, and typically 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approx.) 20°C). B It is measured as.

[0629] In one embodiment of the present invention, TADF emitter E B It exhibits a photoluminescence quantum yield (PLQY) of over 70%, and typically 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approx.) 20°C). B It is measured as.

[0630] In one embodiment of the present invention, at least one preferably each TADF material E B Is

[0631] (i) Lowest excitation singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ΔE corresponding to the energy difference between ) ST Characterized by a value of less than 0.4 eV;

[0632] (ii) Exhibits a photoluminescence quantum yield (PLQY) greater than 30%.

[0633] In one embodiment of the present invention, each TADF material E B The lowest unoccupied molecular orbital LUMO(E B The energy E of ) LUMO (E B ) is less than -2.6 eV.

[0634] A person skilled in the art will recognize the TADF molecule E according to the present inventionB We know the method for designing and the structural features typically exhibited by these molecules. Briefly, to facilitate RISC crossover, ΔE ST is generally reduced, and in the context of the present invention, ΔE ST As mentioned above, it is less than 0.4 eV. This often causes the TADF molecule E such that the HOMO and LUMO are spatially significantly separated at the (electronic) donor and (electronic) acceptor groups, respectively. B This is achieved by designing them. These units are generally bulky or twisted and connected via spiro junctions, reducing the spatial overlap between HOMO and LUMO. However, minimizing the spatial overlap between HOMO and LUMO has the disadvantage of lowering the photoluminescence quantum yield (PLQY) of TADF materials. Therefore, in practice, ΔE must be considered by taking both of these effects into account. ST Achieve a reduction in and a high PLQY.

[0635] One general approach for designing TADF materials is to co-attach one or more (electron-)donor moieties with distributed HOMOs and one or more (electron-)acceptor moieties with distributed LUMOs to the same bridge, referred herein as a connector. TADF material E B It may also include, for example, two or three connectors coupled to the same acceptor moiety, and additional donor and acceptor moietys may be coupled to each of these two or three connectors.

[0636] One or more donor moiety and one or more acceptor moiety can also be directly coupled to each other (without the presence of a connector).

[0637] Typical donor moiety is diphenylamine, carbazole, acridine, phenoxazine, and derivatives of related structures.

[0639] Benzene-, biphenyl-, and to some extent terphenyl- derivatives are common linkers.

[0640] Nitrile groups are a very common acceptor moiety in TADF molecules, and known examples include the following:

[0641] (i) 2CzPN(4,5-d(9 H -carbazole-9-yl)phthalonitrile), DCzIPN(4,6-di(9 H -carbazole-9-yl)isophthalonitrile), 4CzPN(3,4,5,6-tetra(9 H -carbazole-9-yl)phthalonitrile), 4CzIPN(2,4,5,6-tetra(9 H -carbazole-9-yl)isophthalonitrile), 4CzTPN(2,4,5,6-tetra(9 H Carbazolyl dicyanobenzene compounds such as carbazole-9-yl terephthalonitrile and derivatives thereof;

[0642] (ii) 4CzCNPy(2,3,5,6-tetra(9 H Carbazolyl cyanopyridine compounds such as carbazole-9-yl-4-cyanopyridine and derivatives thereof;

[0643] (iii) CNBPCz(4,4',5,5'-tetra(9 H -carbazole-9-yl)-[1,1'-biphenyl]-2,2'-dicabonitrile), CzBPCN(4,4',6,6'-tetra(9 H -carbazole-9-yl)-[1,1'-biphenyl]-3,3'-dicabonitrile), DDCzIPN(3,3',5,5'-tetra(9 H Carbazolyl cyanobiphenyl compounds such as -carbazole-9-yl-[1,1'-biphenyl]-2,2',6,6'-tetracarbonitrile) and derivatives thereof;

[0644] Here, one or more nitrile groups in these materials can be replaced with fluorine (F) or trifluoromethyl (CF3) as acceptor moiety.

[0645] Nitrogen-heterocyclic compounds such as triazine-, pyrimidine-, triazole-, oxadiazole-, thiadiazole-, heptazine-, 1,4-diazatriphenylene-, benzothiazole-, benzoxazole-, quinoxaline-, and diazfluorene derivatives are also well-known acceptor moietyes used in the construction of TADF molecules. For example, a known example of a TADF molecule containing a triazine acceptor is PIC-TRZ(7,7'-(6-([1,1'-biphenyl]-4-yl)-1,3,5-triazine-2,4-diyl)bis(5-phenyl-5,7-dihydroindolo[2,3-b]carbazole)), m BFCzTrz(5-(3-(4,6-diphenyl-1,3,5-triazine-2-yl))phenyl)-5 H -benzofuro[3,2-c]carbazole), and DCzTrz (9,9'-(5-(4,6-diphenyl-1,3,5-triazine-2-yl)-1,3-phenylene)bis(9 H - Includes carbazole.

[0646] Another group of TADF materials consists of acceptor moietyes to which a donor moiety (primarily carbazoleyl substituents) is attached, such as diaryl ketones like benzophenone, or 4-benzoylpyridine, 9,10-anthraquinone, 9 H - Includes (heteroaryl)aryl ketones such as -xanthen-9-one, and their derivatives. An example of such TADF molecules is BPBCz(bis(4-(9'-phenyl-9) H ,9' H -[3,3'-bicarbazole]-9-yl)phenyl)methanone), mDCBP((3,5-di(9 H -carbazole-9-yl)phenyl)(pyridine-4-yl)methanone), AQ-DTBu-Cz(2,6-bis(4-(3,6-di-tert-butyl-9) H -carbazole-9-yl)phenyl)anthracene-9,10-dione) and MCz-XT(3-(1,3,6,8-tetramethyl-9 H -Carbazol-9-il)-9 H Each contains -xanthen-9-one).

[0647] In addition, sulfoxides, particularly diphenyl sulfoxides, are commonly used as acceptor moiety for the composition of TADF materials, and a known example is 4-PC-DPS(9-phenyl-3-(4-(phenylsulfonyl)phenyl)-9 H -carbazole), DitBu-DPS(9,9'-(sulfonylbis(4,1-phenylene))bis(9 H -carbazole)), and TXO-PhCz(2-(9-phenyl-9 H -Carbazol-3-day)-9 H It contains -thioxanthen-9-one-10,10-dioxide).

[0648] A specific material meets the aforementioned basic requirements, namely ΔE ST Considering that the value is less than 0.4 eV, for example, TADF molecules of all the aforementioned groups are TADF materials E suitable for use according to the present invention. B It can provide.

[0649] Those skilled in the art will find that not only the structure named above but also more materials are suitable TADF materials E in the context of the present invention. B It is known that this is possible. Skilled technicians are familiar with the design principles of these molecules and also know how to design these molecules that have specific emission colors (e.g., blue, green, or red emission).

[0650] Refer to the example below: H. Tanaka, K. Shizu, H. Nakanotani, C. Adachi, Chemistry of Materials 2013 , 25 (18), 3766, DOI: 10.1021 / cm402428a; J. Li, T. Nakagawa, J. MacDonald, Q. Zhang, H. Nomura, H. Miyazaki, C. Adachi, Advanced Materials 2013 , 25(24), 3319, DOI: 10.1002 / adma.201300575; K. Nasu, T. Nakagawa, H. Nomura, C.-J. Lin, C.-H. Cheng, M.-R. Tseng, T. Yasudaad, C. Adachi, Chemical Communications 2013 , 49 (88), 10385, DOI: 10.1039 / c3cc44179b; Q. Zhang, B. Li1, S. Huang, H. Nomura, H. Tanaka, C. Adachi, Nature Photonics 2014 , 8 (4), 326, DOI: 10.1038 / nphoton.2014.12; B. Wex, BR Kapharani, Journal of Materials Chemistry C 2017 , 5 , 8622, DOI: 10.1039 / c7tc02156a; Y. Im, M. Kim, YJ Cho, J.-A. Seo, K.S. Yoke, J.Y. Lee, Chemistry of Materials 2017 , 29( 5), 1946, DOI: 10.1021 / acs.chemmater.6b05324; T.-T. Bui, F. Goubard, M. Ibrahim-Ouali, D. Gigmes, F. Dumur, Beilstein Journal of Organic Chemistry 2018 , 14 , 282, DOI: 10.3762 / bjoc.14.18; X. Liang, Z.-L. Tu, Y.-X. Zheng, Chemistry - A European Journal 2019 , 25 (22), 5623, DOI: 10.1002 / chem.201805952.

[0651] In addition, for example, US2015105564 (A1), US2015048338 (A1), US2015141642 (A1), US2014336379 (A1), US2014138670 (A1), US2012241732 (A1), EP3315581 (A1), EP3483156 (A1) and US2018053901 (A1) are TADF materials E that can be used in organic electroluminescent devices according to the present invention. B The present invention discloses the following. It is understood that this does not imply that the present invention is limited to organic electroluminescent devices comprising the TADF materials disclosed in the cited references. Any TADF material used in the latest technology is also a suitable TADF material E in the context of the present invention. B It is understood that this could be the case.

[0652] In one embodiment of the present invention, each TADF material E B It comprises one or more chemical moieties independently selected from the group consisting of CN, CF3, and optionally substituted 1,3,5-triazinyl groups.

[0653] In one embodiment of the present invention, each TADF material E B It comprises one or more chemical moieties independently selected from the group consisting of CN and optionally substituted 1,3,5-triazinyl groups.

[0654] In one embodiment of the present invention, each TADF material E B It contains one or more optionally substituted 1,3,5-triazinyl groups.

[0655] In one embodiment of the present invention, each TADF material E BIt comprises one or more chemical moieties independently selected from amino groups, indole groups, carbazole groups and derivatives thereof, all of which may be optionally substituted, wherein these groups may be bonded to the core structure of each TADF molecule through nitrogen (N) or carbon (C) atoms, and the substituents bonded to these groups may form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system.

[0656] In a preferred embodiment of the present invention, at least one, preferably each TADF material E B ... includes doing the following:

[0657] - One or more first chemical moietyes that are independently selected from amino groups, indole groups, carbazole groups and their derivatives, all of which may be optionally substituted, wherein these groups may be bonded to the core structure of each TADF molecule through nitrogen (N) or carbon (C) atoms, and the substituents bonded to these groups may form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system;

[0658] - One or more second chemical moietyes independently selected from the group consisting of CN, CF3 and optionally substituted 1,3,5-triazinyl groups.

[0659] In a more preferred embodiment of the present invention, at least one, preferably each TADF material E B ... includes doing the following:

[0660] - One or more first chemical moietyes that are independently selected from amino groups, indole groups, carbazole groups and their derivatives, all of which may be optionally substituted, wherein these groups may be bonded to the core structure of each TADF molecule through nitrogen (N) or carbon (C) atoms, and the substituents bonded to these groups may form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system;

[0661] - One or more second chemical moietyes independently selected from the group consisting of CN, CF3 and optionally substituted 1,3,5-triazinyl groups.

[0662] In a more preferred embodiment of the present invention, at least one, preferably each TADF material E B ... includes doing the following:

[0663] - One or more first chemical moietyes that are independently selected from amino groups, indole groups, carbazole groups and their derivatives, all of which may be optionally substituted, wherein these groups may be bonded to the core structure of each TADF molecule through nitrogen (N) or carbon (C) atoms, and the substituents bonded to these groups may form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system;

[0664] - One or more optionally substituted 1,3,5-triazinyl groups.

[0665] Those skilled in the art know that the expression “derivatives thereof” means that each parent structure may be optionally substituted or that any atom within each parent structure may be replaced, for example, with an atom of another element.

[0666] In one embodiment of the present invention, the organic electroluminescent device comprises at least one light-emitting layer B comprising the following:

[0667] (i) Lowest excitation singlet state energy level E(S1 H ) and lowest excited triplet state energy level E(T1 H At least one host material H having ) B ;

[0668] (ii) Lowest excitation singlet state energy level E(S1 P ) and lowest excited triplet state energy level E(T1 P At least one phosphorescent material P having ) B ; and

[0669] (iii) Lowest excited singlet state energy level E(S1 S ) and lowest excited triplet state energy level E(T1 S At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ;

[0670] (iv) Lowest excited singlet state energy level E(S1 E ) and lowest excited triplet state energy level E(T1 E At least one thermally activated delayed fluorescence (TADF) material E having ) B ,

[0671] Here, the relationship expressed by the following equations (1) and (2) is applied:

[0672] E(T1 H ) > E(T1 P ) (1)

[0673] E(T1 P ) > E(S1 S ) (2),

[0674] Each TADF material E B ... includes doing the following:

[0675] - One or more first chemical moietyes that are independently selected from amino groups, indole groups, carbazole groups and their derivatives, all of which may be optionally substituted, wherein these groups may be bonded to the core structure of each TADF molecule through nitrogen (N) or carbon (C) atoms, and the substituents bonded to these groups may form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system;

[0676] - One or more second chemical moietyes independently selected from the group consisting of CN and optionally substituted 1,3,5-triazinyl groups.

[0677] In one embodiment of the present invention, each TADF material E B ... includes doing the following:

[0678] - One or more first chemical moietyes each comprising or composed of a structure according to the chemical formula DI:

[0679]

[0680] Chemical formula DI

[0681] and

[0682] - Optionally, one or more second chemical moieties, each independently selected from structures according to any one of CN, CF3 and formulas AI, A-II, A-III, and A-IV:

[0683]

[0684] Chemical formula AI Chemical formula A-II Chemical formula A-III Chemical formula A-IV

[0685] and

[0686] - A third chemical moiety comprising or composed of a structure according to any one of the chemical formulas LI, L-II, L-III, L-IV, LV, L-VI, L-VII, and L-VIII:

[0687]

[0688] Chemical formula LI Chemical formula L-II

[0689]

[0690] Chemical formula L-III Chemical formula L-IV

[0691]

[0692] Chemical formula LV Chemical formula L-VI

[0693]

[0694] Chemical formula L-VII Chemical formula L-VIII,

[0695] Here

[0696] One or more first chemical moiety and one or more second chemical moiety are covalently bonded to a third chemical moiety through a single bond;

[0697] Among the chemical formulas DI:

[0698] # represents the bonding site of a single bond connecting each first chemical moiety to a third chemical moiety according to the chemical formula DI;

[0699] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=CR 1 R 2 , C=O, C=NR 1 , NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[0700] R a , R b , R d , R 1 , and R 2 In each case, hydrogen, deuterium, and N(R) are independent of each other. 3 )2, OR 3 , Si(R 3 )3, B(OR3 )2, OSO2R 3 , CF3, CN, F, Cl, Br, I,

[0701] One or more substituents R 3 C1-C optionally substituted with 40 -alkyl,

[0702] Here, one or more non-adjacent CH2 groups are R 3 C=CR 3 , C≡C, Si(R 3 )2, Ge(R 3 )2, Sn(R 3 )2, C=O, C=S, C=Se, C=NR 3 , P(=O)(R 3 ), SO, SO2, NR 3 , O, S or CONR 3 Optionally replaced with;

[0703] One or more substituents R 3 C1-C optionally substituted with 40 - Alkoxy,

[0704] Here, one or more non-adjacent CH2 groups are R 3 C=CR 3 , C≡C, Si(R 3 )2, Ge(R 3 )2, Sn(R 3 )2, C=O, C=S, C=Se, C=NR 3 , P(=O)(R 3 ), SO, SO2, NR 3 , O, S or CONR 3 Optionally replaced with;

[0705] One or more substituents R 3 C1-C optionally substituted with 40 -Thioalkoxy,

[0706] Here, one or more non-adjacent CH2 groups are R 3 C=CR 3 , C≡C, Si(R 3 )2, Ge(R 3 )2, Sn(R3 )2, C=O, C=S, C=Se, C=NR 3 , P(=O)(R 3 ), SO, SO2, NR 3 , O, S or CONR 3 Optionally replaced with;

[0707] One or more substituents R 3 C2-C optionally substituted with 40 -Alkenil,

[0708] Here, one or more non-adjacent CH2 groups are R 3 C=CR 3 , C≡C, Si(R 3 )2, Ge(R 3 )2, Sn(R 3 )2, C=O, C=S, C=Se, C=NR 3 , P(=O)(R 3 ), SO, SO2, NR 3 , O, S or CONR 3 Optionally replaced with;

[0709] One or more substituents R 3 C2-C optionally substituted with 40 -Alkinil,

[0710] Here, one or more non-adjacent CH2 groups are R 3 C=CR 3 , C≡C, Si(R 3 )2, Ge(R 3 )2, Sn(R 3 )2, C=O, C=S, C=Se, C=NR 3 , P(=O)(R 3 ), SO, SO2, NR 3 , O, S or CONR 3 Optionally replaced with;

[0711] One or more substituents R 3 C6-C optionally substituted 60 -Aryl; and

[0712] One or more substituents R 3C3-C optionally substituted with 60 -Heteroaryl;

[0713] Selected from a group composed of;

[0714] R 3 In each case, hydrogen, deuterium, and N(R) are independent of each other. 4 )2, OR 4 , Si(R 4 )3, B(OR 4 )2, OSO2R 4 , CF3, CN, F, Br, I,

[0715] C1-C 40 -alkyl,

[0716] This is one or more substituents R 4 Optionally replaced with,

[0717] Here, one or more non-adjacent CH2 groups are R 4 C=CR 4 , C≡C, Si(R 4 )2, Ge(R 4 )2, Sn(R 4 )2, C=O, C=S, C=Se, C=NR 4 , P(=O)(R 4 ), SO, SO2, NR 4 , O, S or CONR 4 Optionally replaced with;

[0718] C1-C 40 - Alkoxy,

[0719] This is one or more substituents R 4 Optionally replaced with,

[0720] Here, one or more non-adjacent CH2 groups are R 4 C=CR 4 , C≡C, Si(R 4 )2, Ge(R 4 )2, Sn(R 4 )2, C=O, C=S, C=Se, C=NR 4 , P(=O)(R 4 ), SO, SO2, NR 4, O, S or CONR 4 Optionally replaced with;

[0721] C1-C 40 -Thioalkoxy,

[0722] This is one or more substituents R 4 Optionally replaced with,

[0723] Here, one or more non-adjacent CH2 groups are R 4 C=CR 4 , C≡C, Si(R 4 )2, Ge(R 4 )2, Sn(R 4 )2, C=O, C=S, C=Se, C=NR 4 , P(=O)(R 4 ), SO, SO2, NR 4 , O, S or CONR 4 Optionally replaced with;

[0724] C2-C 40 -Alkenil,

[0725] This is one or more substituents R 4 Optionally replaced with,

[0726] Here, one or more non-adjacent CH2 groups are R 4 C=CR 4 , C≡C, Si(R 4 )2, Ge(R 4 )2, Sn(R 4 )2, C=O, C=S, C=Se, C=NR 4 , P(=O)(R 4 ), SO, SO2, NR 4 , O, S or CONR 4 Optionally replaced with;

[0727] C2-C 40 -Alkinil,

[0728] This is one or more substituents R 4 Optionally replaced with,

[0729] Here, one or more non-adjacent CH2 groups are R 4C=CR 4 , C≡C, Si(R 4 )2, Ge(R 4 )2, Sn(R 4 )2, C=O, C=S, C=Se, C=NR 4 , P(=O)(R 4 ), SO, SO2, NR 4 , O, S or CONR 4 Optionally replaced with;

[0730] One or more substituents R 4 C6-C that is optionally substituted 60 -Aryl; and

[0731] One or more substituents R 4 C3-C that is optionally substituted 57 -Heteroaryl;

[0732] Selected from a group composed of;

[0733] Here, optionally, any substituent R a , R b , R d , R 1 , R 2 , R 3 , and R 4 R are independent of each other a , R b , R d , R 1 , R 2 , R 3 and R 4 Forming a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from; optionally, the ring system thus formed comprises one or more substituents R 5 Optionally replaced with;

[0734] R 4 and R 5 In each case, independently of each other, hydrogen, deuterium, OPh, CF3, CN, F,

[0735] C1-C5-alkyl,

[0736] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0737] C1-C5-alkoxy,

[0738] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0739] C1-C5-thioalkoxy,

[0740] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0741] C2-C5-alkenyl,

[0742] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0743] C2-C5-alkynyl,

[0744] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0745] C6-C 18 -Aril,

[0746] Here, one or more hydrogen atoms are optionally substituted independently by deuterium, C1-C5-alkyl, Ph, or CN;

[0747] C3-C 17 -Heteroaryl,

[0748] Here, one or more hydrogen atoms are optionally substituted independently by deuterium, Ph, or C1-C5-alkyl;

[0749] N(C6-C 18 -Aril)2;

[0750] N(C3-C 17 -heteroaryl)2, and

[0751] N(C3-C 17-heteroaryl)(C6-C 18 -Aril);

[0752] Selected from a group composed of;

[0753] a is an integer, and is 0 or 1;

[0754] b is an integer, 0 or 1 in each case, where the two b are always the same;

[0755] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[0756] In chemical formulas AI, A-II, A-III, and A-IV:

[0757] The dotted line indicates a single bond connecting each second chemical moiety according to chemical formulas AI, A-II, A-III, or A-IV to a third chemical moiety;

[0758] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1 At least one of them is CR 7 And;

[0759] Q 2 In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2 is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[0760] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, N(R 9 )2, OR9 , Si(R 9 )3, B(OR 9 )2, OSO2R 9 , CF3, CN, F, Cl, Br, I,

[0761] C1-C 40 -alkyl,

[0762] This is one or more substituents R 9 Optionally replaced with,

[0763] Here, one or more non-adjacent CH2 groups are R 9 C=CR 9 , C≡C, Si(R 9 )2, Ge(R 9 )2, Sn(R 9 )2, C=O, C=S, C=Se, C=NR 9 , P(=O)(R 9 ), SO, SO2, NR 9 , O, S or CONR 9 Optionally replaced with;

[0764] C1-C 40 - Alkoxy,

[0765] This is one or more substituents R 9 Optionally replaced with,

[0766] Here, one or more non-adjacent CH2 groups are R 9 C=CR 9 , C≡C, Si(R 9 )2, Ge(R 9 )2, Sn(R 9 )2, C=O, C=S, C=Se, C=NR 9 , P(=O)(R 9 ), SO, SO2, NR 9 , O, S or CONR 9 Optionally replaced with;

[0767] C1-C 40 -Thioalkoxy,

[0768] This is one or more substituents R 9 Optionally replaced with,

[0769] Here, one or more non-adjacent CH2 groups are R 9 C=CR 9 , C≡C, Si(R 9 )2, Ge(R 9 )2, Sn(R 9 )2, C=O, C=S, C=Se, C=NR 9 , P(=O)(R 9 ), SO, SO2, NR 9 , O, S or CONR 9 Optionally replaced with;

[0770] C2-C 40 -Alkenil,

[0771] This is one or more substituents R 9 Optionally replaced with,

[0772] Here, one or more non-adjacent CH2 groups are R 9 C=CR 9 , C≡C, Si(R 9 )2, Ge(R 9 )2, Sn(R 9 )2, C=O, C=S, C=Se, C=NR 9 , P(=O)(R 9 ), SO, SO2, NR 9 , O, S or CONR 9 Optionally replaced with;

[0773] C2-C 40 -Alkinil,

[0774] This is one or more substituents R 9 Optionally replaced with,

[0775] Here, one or more non-adjacent CH2 groups are R 9 C=CR 9 , C≡C, Si(R 9 )2, Ge(R 9 )2, Sn(R 9 )2, C=O, C=S, C=Se, C=NR 9 , P(=O)(R 9 ), SO, SO2, NR9 , O, S or CONR 9 Optionally replaced with;

[0776] C6-C 60 -Aril,

[0777] This is one or more substituents R 9 Optionally replaced with,

[0778] C3-C 60 -Heteroaryl,

[0779] This is one or more substituents R 9 Optionally replaced with;

[0780] Selected from a group composed of;

[0781] R 9 In each case, hydrogen, deuterium, and N(R) are independent of each other. 10 )2, OR 10 , Si(R 10 )3, B(OR 10 )2, OSO2R 10 , CF3, CN, F, Cl, Br, I,

[0782] C1-C 40 -alkyl,

[0783] This is one or more substituents R 10 Optionally replaced with,

[0784] Here, one or more non-adjacent CH2 groups are R 10 C=CR 10 , C≡C, Si(R 10 )2, Ge(R 10 )2, Sn(R 10 )2, C=O, C=S, C=Se, C=NR 10 , P(=O)(R 10 ), SO, SO2, NR 10 , O, S or CONR 10 Optionally replaced with;

[0785] C1-C 40 - Alkoxy,

[0786] This is one or more substituents R10 Optionally replaced with,

[0787] Here, one or more non-adjacent CH2 groups are R 10 C=CR 10 , C≡C, Si(R 10 )2, Ge(R 10 )2, Sn(R 10 )2, C=O, C=S, C=Se, C=NR 10 , P(=O)(R 10 ), SO, SO2, NR 10 , O, S or CONR 10 Optionally replaced with;

[0788] C1-C 40 -Thioalkoxy,

[0789] This is one or more substituents R 10 Optionally replaced with,

[0790] Here, one or more non-adjacent CH2 groups are R 10 C=CR 10 , C≡C, Si(R 10 )2, Ge(R 10 )2, Sn(R 10 )2, C=O, C=S, C=Se, C=NR 10 , P(=O)(R 10 ), SO, SO2, NR 10 , O, S or CONR 10 Optionally replaced with;

[0791] C2-C 40 -Alkenil,

[0792] This is one or more substituents R 10 Optionally replaced with,

[0793] Here, one or more non-adjacent CH2 groups are R 10 C=CR 10 , C≡C, Si(R 10 )2, Ge(R 10 )2, Sn(R 10 )2, C=O, C=S, C=Se, C=NR 10 , P(=O)(R10 ), SO, SO2, NR 10 , O, S or CONR 10 Optionally replaced with;

[0794] C2-C 40 -Alkinil,

[0795] This is one or more substituents R 10 Optionally replaced with,

[0796] Here, one or more non-adjacent CH2 groups are R 10 C=CR 10 , C≡C, Si(R 10 )2, Ge(R 10 )2, Sn(R 10 )2, C=O, C=S, C=Se, C=NR 10 , P(=O)(R 10 ), SO, SO2, NR 10 , O, S or CONR 10 Optionally replaced with;

[0797] C6-C 60 -Aril,

[0798] This is one or more substituents R 10 Optionally substituted as; and

[0799] C3-C 60 -Heteroaryl,

[0800] This is one or more substituents R 10 Optionally replaced with;

[0801] Selected from a group composed of;

[0802] R 10 In each case, hydrogen, deuterium, OPh, CF3, CN, F, independently of each other

[0803] C1-C5-alkyl,

[0804] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0805] C1-C5-alkoxy,

[0806] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0807] C1-C5-thioalkoxy,

[0808] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0809] C2-C5-alkenyl,

[0810] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0811] C2-C5-alkynyl,

[0812] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0813] C6-C 18 -Aril,

[0814] Here, one or more hydrogen atoms are optionally substituted independently by deuterium, C1-C5-alkyl, Ph, or CN;

[0815] C3-C 17 -Heteroaryl,

[0816] Here, one or more hydrogen atoms are optionally substituted independently by deuterium, Ph, or C1-C5-alkyl;

[0817] N(C6-C 18 -Aril)2;

[0818] N(C3-C 17 -heteroaryl)2, and

[0819] N(C3-C 17 -heteroaryl)(C6-C 18 -Aril);

[0820] Selected from a group composed of;

[0821] R 7In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[0822]

[0823] Chemical formula EWG-I,

[0824] Here, R X is R 6 Defined as such, provided that at least one R in the chemical formula EWG-I X The gas is CN or CF3;

[0825] Here, two adjacent groups R in chemical formulas A-IV 8 ... optionally forms an aromatic ring, which fuses to the structure of formulas A-IV, and optionally one or more substituents R 10 It is substituted with; wherein optionally, the fused ring system thus formed comprises a total of 9 to 18 ring atoms;

[0826] Among the chemical formulas LI, L-II, L-III, L-IV, LV, L-VI, L-VII, and L-VIII:

[0827] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q 3 is nitrogen (N);

[0828] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or independently hydrogen, deuterium, F, Cl, Br, I,

[0829] C1-C5-alkyl,

[0830] Here, one or more hydrogen atoms are optionally replaced with deuterium;

[0831] C6-C 18 -Aril,

[0832] Here, one or more hydrogen atoms are optionally independently of each other deuterium, C1-C5-alkyl groups, C6-C 18 - Substituted by aryl groups, F, Cl, Br, and I;

[0833] Selected from a group composed of;

[0834] R 12 is R 6 Defined as;

[0835] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of possible bonding sites of the third chemical moiety (i.e., R 11 Limited only by the number of), provided that each TADF material E in accordance with the aforementioned regulation B It includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety.

[0836] In a preferred embodiment of the present invention,

[0837] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=CR 1 R 2 , C=O, C=NR 1 , NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[0838] R a , R b , R d , R 1 , and R 2 In each case, hydrogen, deuterium, and N(R) are independent of each other. 3 )2, OR 3 , Si(R 3 )3, CF3, CN, F, Cl, Br, I,

[0839] C1-C 40 -alkyl,

[0840] This is one or more substituents R 3 Optionally replaced with,

[0841] Here, one or more non-adjacent CH2 groups are R 3 C=CR 3 , C≡C, Si(R 3 )2, Ge(R 3 )2, Sn(R 3 )2, C=O, C=S, C=Se, C=NR 3 , P(=O)(R 3 ), SO, SO2, NR 3 , O, S or CONR 3 Optionally replaced with;

[0842] C6-C 60 -Aril,

[0843] This is one or more substituents R 3 Optionally replaced with,

[0844] C3-C 60 -Heteroaryl,

[0845] This is one or more substituents R 3 Optionally replaced with,

[0846] Selected from a group composed of;

[0847] R 3 In each case, hydrogen, deuterium, and N(R) are independent of each other. 4 )2, OR 4 , Si(R 4 )3, CF3, CN, F, Br, I,

[0848] C1-C 40 -alkyl,

[0849] This is one or more substituents R 4 Optionally replaced with,

[0850] Here, one or more non-adjacent CH2 groups are R 4 C=CR 4 , C≡C, Si(R 4 )2, Ge(R 4 )2, Sn(R4 )2, C=O, C=S, C=Se, C=NR 4 , P(=O)(R 4 ), SO, SO2, NR 4 , O, S or CONR 4 Optionally replaced with ;;

[0851] C6-C 60 -Aril,

[0852] This is one or more substituents R 4 Optionally replaced with,

[0853] C3-C 57 -Heteroaryl,

[0854] This is one or more substituents R 4 Optionally replaced with;

[0855] Selected from a group composed of;

[0856] Here, optionally substituent R a , R b , R d , R 1 , R 2 , R 3 , and R 4 Any one of them is independent of each other R a , R b , R d , R 1 , R 2 , R 3 and R 4 Forming a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from; wherein optionally, the ring system thus formed comprises one or more substituents R 5 It can be optionally replaced with;

[0857] R 4 and R 5 In each case, independently of each other, hydrogen, deuterium, CF3, CN, F,

[0858] C1-C5-alkyl,

[0859] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0860] C6-C 18 -Aril,

[0861] Here, one or more hydrogen atoms are optionally substituted independently by deuterium, C1-C5-alkyl, Ph, or CN;

[0862] C3-C 17 -Heteroaryl,

[0863] Here, one or more hydrogen atoms are optionally substituted independently with deuterium, C1-C5-alkyl or Ph;

[0864] N(C6-C 18 -Aril)2;

[0865] N(C3-C 17 -heteroaryl)2, and

[0866] N(C3-C 17 -heteroaryl)(C6-C 18 -Aril);

[0867] Selected from a group composed of;

[0868] a is an integer and is 0 or 1;

[0869] b is an integer, 0 or 1 in each case, where the two b are always the same;

[0870] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[0871] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1At least one of them is CR 7 And;

[0872] Q 2 In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2 is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[0873] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, N(R 9 )2, OR 9 , Si(R 9 )3, B(OR 9 )2, OSO2R 9 , CF3, CN, F, Cl, Br, I,

[0874] C1-C 40 -alkyl,

[0875] This is one or more substituents R 9 Optionally replaced with,

[0876] Here, one or more non-adjacent CH2 groups are R 9 C=CR 9 , C≡C, Si(R 9 )2, Ge(R 9 )2, Sn(R 9 )2, C=O, C=S, C=Se, C=NR 9 , P(=O)(R 9 ), SO, SO2, NR 9 , O, S or CONR 9 Optionally replaced with;

[0877] C6-C 60 -Aril,

[0878] This is one or more substituents R 9 Optionally replaced with,

[0879] C3-C 60 -Heteroaryl,

[0880] This is one or more substituents R 9 Optionally replaced with;

[0881] Selected from a group composed of;

[0882] R 9 In each case, hydrogen, deuterium, and N(R) are independent of each other. 10 )2, OR 10 , Si(R 10 )3, B(OR 10 )2, OSO2R 10 , CF3, CN, F, Cl, Br, I,

[0883] C1-C 40 -alkyl,

[0884] This is one or more substituents R 10 Optionally replaced with,

[0885] Here, one or more non-adjacent CH2 groups are R 10 C=CR 10 , C≡C, Si(R 10 )2, Ge(R 10 )2, Sn(R 10 )2, C=O, C=S, C=Se, C=NR 10 , P(=O)(R 10 ), SO, SO2, NR 10 , O, S or CONR 10 Optionally replaced with;

[0886] C6-C 60 -Aril,

[0887] This is one or more substituents R 10 Optionally substituted as; and

[0888] C3-C 60 -Heteroaryl,

[0889] This is one or more substituents R 10 Optionally replaced with;

[0890] Selected from a group composed of;

[0891] R 10In each case, hydrogen, deuterium, OPh, CF3, CN, F, independently of each other

[0892] C1-C5-alkyl,

[0893] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[0894] C6-C 18 -Aril,

[0895] Here, one or more hydrogen atoms are optionally substituted independently by deuterium, C1-C5-alkyl, Ph, or CN;

[0896] C3-C 17 -Heteroaryl,

[0897] Here, one or more hydrogen atoms are optionally substituted independently by deuterium, Ph, or C1-C5-alkyl;

[0898] N(C6-C 18 -Aril)2;

[0899] N(C3-C 17 -heteroaryl)2, and

[0900] N(C3-C 17 -heteroaryl)(C6-C 18 -Aril);

[0901] Selected from a group composed of;

[0902] R 7 In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[0903]

[0904] Chemical formula EWG-I,

[0905] Here, R X is R 6 It is defined as such, provided that at least one R X The group is CN or CF3;

[0906] Here, two adjacent groups R in chemical formulas A-IV 8 ... optionally forms an aromatic ring, which fuses to the structure of formulas A-IV, and one or more substituents R 10 It is selectively substituted with; wherein the fused ring system thus formed selectively comprises a total of 9 to 18 ring atoms;

[0907] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q 3 is nitrogen (N);

[0908] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or hydrogen, deuterium,

[0909] C1-C5-alkyl,

[0910] Here, one or more hydrogen atoms are optionally replaced with deuterium;

[0911] C6-C 18 -Aril,

[0912] Here, one or more hydrogen atoms are optionally independently of each other deuterium, C1-C5-alkyl groups and C6-C 18 - Substituted by an aryl group;

[0913] Selected from a group composed of;

[0914] R 12 is R 6 Defined as;

[0915] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of available binding sites in the third chemical moiety (i.e., substituent R 11 It is limited only by the number of (preferably, in accordance with the aforementioned regulation, each TADF material E BIt includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety).

[0916] In a more preferred embodiment of the present invention,

[0917] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=CR 1 R 2 , C=O, C=NR 1 , NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[0918] R a , R b , R d , R 1 , and R 2 In each case, hydrogen, deuterium, and N(R) are independent of each other. 3 )2, OR 3 , Si(R 3 )3, CF3, CN, F, Cl, Br, I,

[0919] C1-C 40 -alkyl,

[0920] This is one or more substituents R 3 Optionally replaced with,

[0921] C6-C 18 -Aril,

[0922] This is one or more substituents R 3 Optionally substituted as; and

[0923] C3-C 17 -Heteroaryl,

[0924] This is one or more substituents R 3 Optionally replaced with;

[0925] Selected from a group composed of;

[0926] R 3In each case, hydrogen, deuterium, and N(R) are independent of each other. 4 )2, Si(R 4 )3, CF3, CN, F,

[0927] C1-C5-alkyl,

[0928] This is one or more substituents R 4 Optionally replaced with,

[0929] C6-C 18 -Aril,

[0930] This is one or more substituents R 4 Optionally substituted as; and

[0931] C3-C 17 -Heteroaryl,

[0932] This is one or more substituents R 4 Optionally replaced with;

[0933] Selected from a group composed of;

[0934] Here, optionally substituent R a , R b , R d , R 1 , R 2 and R 3 Any one of them is independent of each other R a , R b , R d , R 1 , R 2 and R 3 Forming a monocyclic or polycyclic, aliphatic or aromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from; wherein optionally, the ring system thus formed comprises one or more substituents R 5 It can be optionally replaced with;

[0935] R 4 and R 5 In each case, hydrogen, deuterium, CF3, CN, F, Me, independently of each other i Pr, tBu, N(Ph)2, and

[0936] One or more hydrogen atoms selectively and independently of each other deuterium, Me, i Pr, t Bu, and Ph substituted with Ph;

[0937] Selected from a group composed of,

[0938] a is an integer and is 0 or 1;

[0939] b is an integer, 0 or 1 in each case, where the two b are always the same;

[0940] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[0941] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1 At least one of them is CR 7 And;

[0942] Q 2 In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2 is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[0943] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, N(R 9 )2, OR 9 , Si(R 9 )3, CF3, CN, F,

[0944] C1-C5-alkyl,

[0945] This is one or more substituents R 9 Optionally replaced with;

[0946] C6-C 18 -Aril,

[0947] This is one or more substituents R 9 Optionally substituted as; and

[0948] C3-C 17 -Heteroaryl,

[0949] This is one or more substituents R 9 Optionally replaced with;

[0950] Selected from a group composed of;

[0951] R 9 In each case, hydrogen, deuterium, and N(R) are independent of each other. 10 )2, OR 10 , Si(R 10 )3, CF3, CN, F,

[0952] C1-C5-alkyl,

[0953] This is one or more substituents R 10 Optionally replaced with,

[0954] C6-C 18 -Aril,

[0955] This is one or more substituents R 10 Optionally substituted as; and

[0956] C3-C 17 -Heteroaryl,

[0957] This is one or more substituents R 10 Optionally replaced with;

[0958] Selected from a group composed of;

[0959] R 10 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu, CF3, CN, F, N(Ph)2, and

[0960] One or more hydrogen atoms selectively and independently of each other deuterium, Me, i Pr, t Ph substituted by Bu, Ph, CN, CF3, or F;

[0961] It is selected from a group consisting of.

[0962] R 7 In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[0963]

[0964] Chemical formula EWG-I,

[0965] Here, R X is R 6 It is defined as such, provided that at least one R X The gas is CN or CF3;

[0966] Here, two adjacent groups R in chemical formulas A-IV 8 ... optionally forms an aromatic ring, which fuses to the structure of formulas A-IV, and optionally one or more substituents R 10 Substituted by; wherein optionally, the fused ring system thus formed comprises a total of 9 to 18 ring atoms;

[0967] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q 3 is nitrogen (N);

[0968] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or hydrogen, deuterium,

[0969] C1-C5-alkyl,

[0970] Here, one or more hydrogen atoms are optionally replaced with deuterium;

[0971] C6-C 18 -Aril,

[0972] This is deuterium, Me, i Pr, t Selectively substituted with one or more mutually independent substituents selected from the group consisting of Bu and Ph;

[0973] Selected from a group composed of;

[0974] R 12 is R 6 Defined as;

[0975] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of available binding sites in the third chemical moiety (i.e., substituent R 11 It is limited only by the number of (preferably, in accordance with the aforementioned regulation, each TADF material E B It includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety).

[0976] In a more preferred embodiment of the present invention,

[0977] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=O, NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[0978] R a , R b , R d , R 1 , and R 2 In each case, hydrogen, deuterium, and N(R) are independent of each other. 3 )2, OR 3 , Si(R 3 )3, CF3, CN,

[0979] C1-C5-alkyl,

[0980] This is one or more substituents R 3 Optionally replaced with,

[0981] C6-C 18 -Aril,

[0982] This is one or more substituents R 3 Optionally substituted as; and

[0983] C3-C 17 -Heteroaryl,

[0984] This is one or more substituents R 3 Optionally replaced with;

[0985] Selected from a group composed of;

[0986] R 3 In each case, hydrogen, deuterium, CF3, CN, F, Me, independently of each other i Pr, t Bu, N(Ph)2,

[0987] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Bu, and Ph substituted with Ph;

[0988] Selected from a group composed of;

[0989] Here, optionally, any substituent R a , R b , R d , R 1 and R 2 R are independent of each other a , R b , R d , R 1 and R 2 Forming a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from; wherein optionally, the ring system thus formed is hydrogen, deuterium, Me, i Pr,t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[0990] The fused ring system, optionally formed herein, comprising a structure according to Formula D-1 and an attached ring formed by adjacent substituents, comprises a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms;

[0991] a is an integer, and is 0 or 1;

[0992] b is an integer, 0 or 1 in each case, where the two b are always the same;

[0993] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[0994] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1 At least one of them is CR 7 And;

[0995] Q 2 In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2 is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[0996] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, N(R 9 )2, OR 9 , Si(R 9 )3, CF3, CN, F,

[0997] C1-C5-alkyl,

[0998] This is one or more substituents R 9 Optionally replaced with;

[0999] C6-C 18 -Aril,

[1000] This is one or more substituents R 9 Optionally substituted as; and

[1001] C3-C 17 -Heteroaryl,

[1002] This is one or more substituents R 9 Optionally replaced with;

[1003] Selected from a group composed of;

[1004] R 9 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu, CF3, CN, F, N(Ph)2, and

[1005] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Ph substituted by Bu, Ph, CN, CF3, or F;

[1006] It is selected from a group consisting of.

[1007] R 7 In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[1008]

[1009] Chemical formula EWG-I,

[1010] Here, R X is R 6 It is defined as such, provided that at least one R X The gas is CN or CF3;

[1011] Here, two adjacent groups R in chemical formulas A-IV 8 It selectively forms an aromatic ring, which is fused to the structure of formulas A-IV, and hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1012] Optionally, the fused ring system formed in this way comprises a total of 9 to 18 ring atoms;

[1013] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q 3 is nitrogen (N);

[1014] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or hydrogen, deuterium, Me, i Pr, t Bu, and

[1015] Me, i Pr, t Ph selectively substituted with one or more independent substituents selected from the group consisting of Bu and Ph;

[1016] Selected from a group composed of;

[1017] R 12 is R6 Defined as;

[1018] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of available binding sites in the third chemical moiety (i.e., substituent R 11 It is limited only by the number of (preferably, each TADF material E according to the aforementioned regulation) B It includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety).

[1019] In a more preferred embodiment of the present invention,

[1020] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=O, NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[1021] R a , R b , and R d In each case, hydrogen, deuterium, and N(R) are independent of each other. 3 )2, OR 3 , Si(R 3 )3, CF3, CN, Me, i Pr, t Bu,

[1022] Ph, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu, and Ph;

[1023] Carbazoyl, where one or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Substituted with Bu, and Ph;

[1024] Triazinyl, where one or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Substituted with Bu, and Ph;

[1025] Pyrimidinyl, where one or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Substituted with Bu, and Ph;

[1026] Pyridinyl, where one or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Substituted with Bu, and Ph;

[1027] Selected from a group composed of;

[1028] R 1 and R 2 In each case, hydrogen, deuterium, and N(R) are independent of each other. 3 )2, OR 3 , Si(R 3 )3, CF3, CN,

[1029] C1-C5-alkyl,

[1030] This is one or more substituents R 3 Optionally replaced with,

[1031] C6-C 18 -Aril,

[1032] This is one or more substituents R 3 Optionally substituted as; and

[1033] C3-C 17 -Heteroaryl,

[1034] This is one or more substituents R 3 Optionally replaced with;

[1035] Selected from a group composed of,

[1036] R 3 In each case, hydrogen, deuterium, CF3, CN, F, Me, independently of each other i Pr,t Bu, and

[1037] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Ph substituted with Bu and Ph;

[1038] Selected from a group composed of;

[1039] Here, optionally, any substituent R a , R b , R d , R 1 and R 2 R are independent of each other a , R b , R d , R 1 and R 2 Forming a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from;

[1040] Here, optionally, the ring system formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted by one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1041] The fused ring system, optionally formed herein, comprising a structure according to Formula D-1 and an attached ring formed by adjacent substituents, comprises a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms;

[1042] a is an integer and is 0 or 1;

[1043] b is an integer, 0 or 1 in each case, where the two b are always the same;

[1044] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[1045] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1 At least one of them is CR 7 And;

[1046] Q 2 In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2 is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[1047] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, N(R 9 )2, OR 9 , Si(R 9 )3, CF3, CN, F,

[1048] C1-C5-alkyl,

[1049] This is one or more substituents R 9 Optionally replaced with;

[1050] C6-C 18 -Aril,

[1051] This is one or more substituents R 9 Optionally replaced with,

[1052] C3-C 17 -Heteroaryl,

[1053] This is one or more substituents R 9 Optionally replaced with;

[1054] Selected from a group composed of;

[1055] R 9 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu, CF3, CN, F, N(Ph)2 and

[1056] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Ph substituted by Bu, Ph, CN, CF3, or F;

[1057] Selected from a group composed of;

[1058] R 7 In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[1059]

[1060] Chemical formula EWG-I,

[1061] Here, R X is R 6 It is defined as such, provided that at least one R X The gas is CN or CF3;

[1062] Here, two adjacent groups R in chemical formulas A-IV 8 It selectively forms an aromatic ring, which is fused to the structure of formulas A-IV, and hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, tIt can be optionally substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1063] Optionally, the fused ring system formed in this way comprises a total of 9 to 18 ring atoms;

[1064] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q 3 is nitrogen (N);

[1065] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or hydrogen, deuterium, Me, i i Pr, t Bu and

[1066] Me, i Pr, t Ph selectively substituted with one or more independent substituents selected from the group consisting of Bu and Ph;

[1067] Selected from a group composed of;

[1068] R 12 is R 6 Defined as;

[1069] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of available binding sites in the third chemical moiety (i.e., substituent R 11 It is limited only by the number of (preferably, each TADF material E according to the aforementioned regulation) B It includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety).

[1070] In a more preferred embodiment of the present invention,

[1071] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=O, NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[1072] R a , R b and R d In each case, hydrogen, deuterium, and N(R) are independent of each other. 3 )2, OR 3 , Si(R 3 )3, CF3, CN, Me, i Pr, t Bu,

[1073] Ph, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu and Ph; and

[1074] Carbazoyl, where one or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Substituted with Bu, and Ph;

[1075] Selected from a group composed of;

[1076] R 1 and R 2 In each case, hydrogen, deuterium, OR independently of each other 3 , Si(R 3 )3,

[1077] C1-C5-alkyl,

[1078] This is one or more substituents R 3 Optionally replaced with,

[1079] C6-C 18 -Aril,

[1080] This is one or more substituents R 3 Optionally replaced with;

[1081] Selected from a group composed of; and

[1082] R 3 In each case, hydrogen, deuterium, CF3, CN, F, Me, independently of each other i Pr, t Bu, and

[1083] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Bu, and Ph substituted with Ph;

[1084] Selected from a group composed of;

[1085] Here, optionally an arbitrary substituent R a , R b , R d , R 1 and R 2 R are independent of each other a , R b , R d , R 1 and R 2 Forming a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from;

[1086] Here, optionally, the ring system formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted by one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1087] The fused ring system, optionally formed herein, comprising a structure according to Formula D-1 and an attached ring formed by adjacent substituents, comprises a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms;

[1088] a is an integer and is 0 or 1;

[1089] b is an integer and is either 0 or 1 in each case, where the two b are always the same.

[1090] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[1091] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1 At least one of them is CR 7 And;

[1092] Q 2 In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2 is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[1093] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, OPh, N(Ph)2, Si(Me)3, Si(Ph)3, CF3, CN, F, Me, i Pr, t Bu,

[1094] One or more hydrogen atoms are selectively independent of each other deuterium, Me,i Pr, t Bu, and Ph substituted with Ph;

[1095] Carbazoyl, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu, and Ph;

[1096] Selected from a group composed of;

[1097] R 7 In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[1098]

[1099] Chemical formula EWG-I,

[1100] Here, R X is R 6 It is defined as such, provided that at least one R X The group is CN or CF3;

[1101] Here, two adjacent groups R in chemical formulas A-IV 8 It selectively forms an aromatic ring, which is fused to the structure of formulas A-IV, and hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1102] Optionally, the fused ring system formed in this way comprises a total of 9 to 18 ring atoms;

[1103] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q3 is nitrogen (N);

[1104] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or hydrogen, deuterium, Me, i Pr, t Bu,

[1105] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Ph substituted with Bu, and Ph;

[1106] Selected from a group composed of;

[1107] R 12 is R 6 Defined as;

[1108] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of available binding sites in the third chemical moiety (i.e., substituent R 11 It is limited only by the number of (preferably, each TADF material E according to the aforementioned regulation) B It includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety).

[1109] In a more preferred embodiment of the present invention,

[1110] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=O, NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[1111] R a , R b , and R dIn each case, hydrogen, deuterium, N(Ph)2, Si(Me)3, Si(Ph) are independently of each other 3, CF3, CN, Me, i Pr, t Bu,

[1112] Ph, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu and Ph; and

[1113] Carbazoyl, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu, and Ph;

[1114] Selected from a group composed of;

[1115] R 1 and R 2 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu,

[1116] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Bu, and Ph substituted with Ph;

[1117] Selected from a group composed of;

[1118] Here, optionally an arbitrary substituent R a , R b , R d , R 1 and R 2 R are independent of each other a , R b , R d , R 1 and R 2 Forming a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from;

[1119] Here, optionally, the ring system formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted by one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1120] The fused ring system, optionally formed herein, comprising a structure according to Formula D-1 and an attached ring formed by adjacent substituents, comprises a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms;

[1121] a is an integer and is 0 or 1;

[1122] b is an integer, 0 or 1 in each case, where the two b are always the same;

[1123] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[1124] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1 At least one of them is CR 7 And;

[1125] Q 2 In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[1126] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, N(Ph)2, Si(Me)3, Si(Ph)3, Me, i Pr, t Bu,

[1127] Ph, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu and Ph; and

[1128] Carbazoyl, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu, and Ph;

[1129] Selected from a group composed of;

[1130] R 7 In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[1131]

[1132] Chemical formula EWG-I,

[1133] Here, R X is R 6 It is defined as such, but can also be CN or CF3, provided that at least one R X The gas is CN or CF3;

[1134] Here, two adjacent groups R in chemical formulas A-IV 8 It selectively forms an aromatic ring, which is fused to the structure of formulas A-IV, and hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, iPr, t It can be optionally substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1135] Optionally, the fused ring system formed in this way comprises a total of 9 to 18 ring atoms;

[1136] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q 3 is nitrogen (N);

[1137] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or hydrogen, deuterium, Me, i Pr, t Bu,

[1138] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Ph substituted with Bu, and Ph;

[1139] Selected from a group composed of;

[1140] R 12 is R 6 Defined as;

[1141] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of available binding sites in the third chemical moiety (i.e., substituent R 11 It is limited only by the number of (preferably, each TADF material E according to the aforementioned regulation) B It includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety).

[1142] In a particularly preferred embodiment of the present invention,

[1143] Z 2 In each case, they are directly coupled independently of each other, CR 1 R 2 , C=O, NR 1 , O, SiR 1 R 2 Selected from the group consisting of , S, S(O) and S(O)2;

[1144] R a , R b and R d In each case, independently of each other, hydrogen, deuterium, N CF3, CN, Me, i Pr, t Bu, and

[1145] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Bu, and Ph substituted with Ph;

[1146] Selected from a group composed of;

[1147] R 1 , and R 2 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu, and

[1148] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Bu, and Ph substituted with Ph;

[1149] Selected from a group composed of;

[1150] Here, optionally an arbitrary substituent R a , R b , R d , R 1 and R 2 R are independent of each other a , R b , R d , R 1 and R 2Forming a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with one or more adjacent substituents selected from;

[1151] Here, optionally, the ring system formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted by one or more substituents independently selected from the group consisting of Ph substituted by Bu, and Ph, and substituted by;

[1152] The fused ring system, optionally formed herein, comprising a structure according to Formula D-1 and an attached ring formed by adjacent substituents, comprises a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms;

[1153] a is an integer, and is 0 or 1;

[1154] b is an integer, 0 or 1 in each case, where the two b are always the same;

[1155] Here, when integer a is 1, the two integers b are 0, and when both integers b are 1, integer a is 0;

[1156] Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, and two adjacent groups Q in the formula AI 1 Both cannot be nitrogen (N); where group Q of the chemical formula AI 1 If none of them are nitrogen (N), group Q 1 At least one of them is CR 7 And;

[1157] Q 2In each case, nitrogen (N) and CR independently of each other 6 Selected from, but at least one group Q from formulas A-II and A-III 2 is nitrogen (N), and two adjacent groups Q 2 Both cannot be nitrogen (N);

[1158] R 6 and R 8 In each case, independently of each other, hydrogen, deuterium, N(Ph)2, Me, i Pr, t Bu,

[1159] Ph, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu, and Ph;

[1160] Carbazoyl, where one or more hydrogen atoms are optionally deuterium, Me, independently of each other i Pr, t Substituted with Bu, and Ph;

[1161] Selected from a group composed of;

[1162] R 7 In each case, is independently selected from the group consisting of structures according to CN, CF3, and the chemical formula EWG-I:

[1163]

[1164] Chemical formula EWG-I,

[1165] Here, R X is R 6 It is defined as such, but can also be CN or CF3, provided that at least one R X The gas is CN or CF3;

[1166] Here, two adjacent groups R in chemical formulas A-IV 8 It selectively forms an aromatic ring, which is fused to the structure of formulas A-IV, and hydrogen, deuterium, Me, i Pr,t Bu, CF3, CN, F, and one or more hydrogen atoms selectively independently of each other deuterium, Me, i Pr, t It can be optionally substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted by F;

[1167] Optionally, the fused ring system formed in this way comprises a total of 9 to 18 ring atoms;

[1168] Q 3 In each case, nitrogen (N) and CR independently of each other 12 Selected from, and at least one Q 3 is nitrogen (N);

[1169] R 11 In each case, it is a bonding site of a single bond connecting a first or second chemical moiety to a third chemical moiety independently of each other, or hydrogen, deuterium, Me, i Pr, t Bu, and

[1170] One or more hydrogen atoms are selectively independent of each other deuterium, Me, i Pr, t Ph substituted with Bu, and Ph;

[1171] Selected from a group composed of;

[1172] R 12 is R 6 Defined as;

[1173] Here, the maximum number of first and second chemical moieties attached to the third chemical moiety is the number of available binding sites in the third chemical moiety (i.e., substituent R 11 It is limited only by the number of (preferably, each TADF material E according to the aforementioned regulation) BIt includes at least one first chemical moiety, at least one second chemical moiety, and exactly one third chemical moiety).

[1174] In a preferred embodiment of the present invention, a is always 1 and b is always 0.

[1175] In a preferred embodiment of the present invention, Z 2 is a direct combination in each case.

[1176] In a preferred embodiment of the present invention, R a It is hydrogen in each case.

[1177] In a preferred embodiment of the present invention, R a and R d It is hydrogen in each case.

[1178] In a preferred embodiment of the present invention, Q 3 In each case, it is nitrogen (N).

[1179] In one embodiment of the present invention, at least one group R in the formula EWG-I is X is CN.

[1180] In a preferred embodiment of the present invention, exactly one group R in the formula EWG-I is used. X is CN.

[1181] In a preferred embodiment of the present invention, exactly one R in the formula EWG-I. X The group is CN, and in the chemical formula EWG-I, R X The group is not CF3.

[1182] Examples of first chemical moiety according to the present invention are shown below, which, of course, does not mean that the present invention is limited to these examples:

[1183]

[1184]

[1185]

[1186]

[1187]

[1188]

[1189]

[1190]

[1191]

[1192]

[1193]

[1194]

[1195]

[1196]

[1197]

[1198]

[1199] The aforementioned definition applies here.

[1200] Examples of second chemical moiety according to the present invention are shown below, which, of course, does not mean that the present invention is limited to these examples:

[1201]

[1202]

[1203]

[1204]

[1205]

[1206]

[1207]

[1208] ,

[1209] The aforementioned definition applies here.

[1210] In a preferred embodiment of the present invention, each TADF material E B is the chemical formula E B -I, E B -II, E B -III, E B -IV, E B -V, E B -VI, E B -VII, E B -VIII, E B -IX, E B -X and E B It has a structure that is represented as one of -XI:

[1211]

[1212] Chemical formula E B -I

[1213]

[1214] Chemical formula E B -II

[1215]

[1216] Chemical formula E B -III

[1217]

[1218] Chemical formula E B -IV

[1219]

[1220] Chemical formula E B -V

[1221]

[1222] Chemical formula E B -VI

[1223]

[1224] Chemical formula E B -VII

[1225]

[1226] Chemical formula EB -VIII

[1227]

[1228] Chemical formula E B -IX

[1229]

[1230] Chemical formula E B -X

[1231]

[1232] Chemical formula E B -XI

[1233] Here

[1234] R 13 is R 11 It is defined as such, where R 13 This first or second chemical moiety cannot be a bonding site of a single bond connecting the first or second chemical moiety to the third chemical moiety;

[1235] R Y is selected from CN and CF3, or R Y comprises or consists of a structure according to the following chemical formula BN-I:

[1236]

[1237] Chemical formula BN-I,

[1238] This is due to the single bond indicated by the dotted line, chemical formula E B -I, E B -II, E B -III, E B -IV, E B -V, E B -VI, E B -VII, E B -VIII or E B It is coupled to the structure of -IX, where exactly one R BN The group is CN, and the other two R BN Both groups are hydrogen (H);

[1239] Otherwise, the definition mentioned above applies.

[1240] In a preferred embodiment of the present invention, R 13 It is hydrogen in each case.

[1241] In one embodiment of the present invention, R Y is CN in each case.

[1242] In one embodiment of the present invention, R Y is CF3 in each case.

[1243] In one embodiment of the present invention, R Y In each case, it is a structure represented by the chemical formula BN-I.

[1244] In a preferred embodiment of the present invention, R Y In each case, it is selected independently from the structures represented by CN and the chemical formula BN-I.

[1245] In a preferred embodiment of the present invention, each TADF material E B is the chemical formula E to which the aforementioned definition applies. B -I, E B -II, E B -III, E B -IV, E B -V, E B -VI, E B -VII and E B It has a structure that is displayed as one of -X.

[1246] In a preferred embodiment of the present invention, each TADF material E B is the chemical formula E to which the aforementioned definition applies. B -I, E B -II, E B -III, E B -V and E B It has a structure that is displayed as one of -X.

[1248] TADF material E for use in an organic electroluminescent device according to the present invention B Examples are listed below, but only the presented examples are suitable for TADF material E in the context of the present invention.B It does not mean that.

[1249] Chemical formula E B TADF material E according to -I B Non-limiting examples of are presented below:

[1250] Chemical formula E B TADF material E according to -I B Non-limiting examples of are presented below:

[1251]

[1252]

[1253]

[1254]

[1255]

[1256]

[1257]

[1258]

[1259]

[1260] Chemical formula E B TADF material E according to -II B Non-limiting examples of are presented below:

[1261]

[1262]

[1263]

[1264]

[1265]

[1266] Chemical formula E B TADF material E according to -III B Non-limiting examples of are presented below:

[1267]

[1268]

[1269]

[1270]

[1271] Chemical formula E B TADF material E according to -IV B Non-limiting examples of are presented below:

[1272]

[1273] Chemical formula E B TADF material E according to -V B Non-limiting examples of are presented below:

[1274]

[1275] Chemical formula E B TADF material E according to -VI B Non-limiting examples of are presented below:

[1276]

[1277] Chemical formula E B TADF material E according to -VII B Non-limiting examples of are presented below:

[1278]

[1279] Chemical formula E B TADF material E according to -VIII B Non-limiting examples of are presented below:

[1280]

[1281] Chemical formula E B TADF material E according to -IX B Non-limiting examples of are presented below:

[1282]

[1283]

[1284] Chemical formula E B TADF material E according to -XB Non-limiting examples of are presented below:

[1285]

[1286]

[1287] Chemical formula E B TADF material E according to -XI B Non-limiting examples of are presented below:

[1288]

[1289] TADF Material E B The synthesis of can be achieved through standard reactions and reaction conditions known to a skilled technician. Generally, in the first step, a coupling reaction, preferably a palladium-catalyzed coupling reaction, can be carried out, which is formula E B -III, E B -IV and E B TADF material E according to any one of -V B The synthesis of is shown below as an example:

[1290]

[1291] E1 is an arbitrary boron (R B =H) or the corresponding boronic acid ester (R B = can be alkyl or aryl), and in particular two R B It can form a ring to provide, for example, pinacol ester of boronic acid. E2 is used as a second reactant, where Hal represents a halogen and can be I, Br, or Cl, but preferably Br. The reaction conditions for such palladium-catalyzed coupling reactions are known to those skilled in the art, for example from WO 2017 / 005699, and it is known that the reactors of E1 and E2 can be swapped as shown below to optimize the reaction yield:

[1292]

[1293] In the second step, a TADF molecule is obtained through the reaction of a nitrogen heterocyclic ring with an aryl halide, preferably an aryl fluoride E3, in a nucleophilic aromatic substitution. Typical conditions include the use of a base, such as tribasic potassium phosphate or sodium hydride, in an aprotic polar solvent, such as, for example, dimethyl sulfoxide (DMSO) or N,N-dimethylformamide (DMF).

[1294]

[1295] In particular, donor molecule E4 is a 3,6-substituted carbazole (e.g., 3,6-dimethylcarbazole, 3,6-diphenylcarbazole, 3,6-di-tert-butylcarbazole), a 2,7-substituted carbazole (e.g., 2,7-dimethylcarbazole, 2,7-diphenylcarbazole, 2,7-di-tert-butylcarbazole), a 1,8-substituted carbazole (e.g., 1,8-dimethylcarbazole, 1,8-diphenylcarbazole, 1,8-di-tert-butylcarbazole), a 1-substituted carbazole (e.g., 1-methylcarbazole, 1-phenylcarbazole, 1-tert-butylcarbazole), a 2-substituted carbazole (e.g., 2-methylcarbazole, 2-phenylcarbazole), It may be 2-tert-butylcarbazole), or 3-substituted carbazole (e.g., 3-methylcarbazole, 3-phenylcarbazole, 3-tert-butylcarbazole).

[1296] Alternatively, halogen-substituted carbazoles, particularly 3-bromocarbazole, can be used as E4.

[1297] In a subsequent reaction, a boronic acid ester functional group or a boronic acid functional group may be introduced, exemplarily, at the position of one or more halogen substituents introduced via E4 to produce the corresponding carbazole-3-yl-boronic acid ester or carbazole-3-yl-boronic acid, for example, through a reaction with (pinacollato)diborone (CAS No. 73183-34-3). Subsequently, the corresponding halogenated reactant, for example R a -Hal, preferably R a -Cl and R aOne or more substituents R instead of a boronic acid ester group or boronic acid group through a coupling reaction with -Br a , R b or R d can be introduced.

[1298] Alternatively, substituent R a [R a -B(OH)2], R b [R b -B(OH)2] or R d [R d Through the reaction of [-B(OH)2] with boronic acid or a corresponding boronic acid ester, one or more substituents R are formed at the position of one or more halogen substituents introduced via DH. a , R b or R d can be introduced.

[1299] In addition, TADF material E B A similar result can be obtained. TADF material E B It can also be obtained by any alternative synthetic route suitable for this purpose.

[1300] An alternative synthesis route may involve introducing a nitrogen heterocyclic ring into an aryl halide or aryl pseudo-halide, preferably an aryl bromide, aryl iodide, aryl trilate, or aryl tosylate, via copper- or palladium-catalyzed coupling.

[1301] Phosphorescent material P B

[1302] Phosphorescent material P in the context of the present invention B It utilizes the intramolecular spin-orbit interaction (heavy atom effect) caused by metal atoms to obtain luminescence from a triplet.

[1303] Generally, it is understood that all phosphorescent complexes used in organic electroluminescent devices in the latest technology can also be used in organic electroluminescent devices according to the present invention.

[1304] Phosphorescent material P used in organic electroluminescent devices B It is common knowledge to those skilled in the art that is often a complex of Ir, Pd, Pt, Au, Os, Eu, Ru, Re, Ag, and Cu, preferably of Ir, Pt, and Pd, and more preferably of Ir and Pt in the context of the present invention. A person skilled in the art knows which materials are suitable as phosphorescent materials in organic electroluminescent devices and how to synthesize them. Furthermore, a person skilled in the art is familiar with the design principles of phosphorescent complexes for use in organic electroluminescent devices and knows how to adjust the luminescence of the complex through structural changes.

[1305] Refer to the example below: C.-L. Ho, H. Li, W.-Y. Wong, Journal of Organometallic Chemistry 2014 , 751 , 261, DOI: 10.1016 / j.jorganchem.2013.09.035; T. Fleetham, G. Li, J. Li, Advanced Science News 2017 , 29 , 1601861, DOI: 10.1002 / adma.201601861; ARBM Yusoff, AJ Huckaba, MK Nazeeruddin, Topics in Current Chemistry (Z) 2017 , 375 :39, 1, DOI: 10.1007 / s41061-017-0126-7; T.-Y. Li, J. Wuc, Z.-G. Wua, Y.-X. Zheng, J.-L. Zuo, Y. Pan, Coordination Chemistry Reviews 2018, 374, 55, DOI: 10.1016 / j.ccr.2018.06.014.

[1306] 예를 들어, US2020274081 (A1), US20010019782 (A1), US20020034656 (A1), US20030138657 (A1), US2005123791 (A1), US20060065890 (A1), US20060134462 (A1), US20070034863 (A1), US20070111026 (A1), US2007034863 (A1), US2007138437 (A1), US20080020237 (A1), US20080297033 (A1), US2008210930 (A1), US20090115322 (A1), US2009104472 (A1), US20100244004 (A1), US2010105902 (A1), US20110057559 (A1), US2011215710 (A1), US2012292601 (A1), US2013165653 (A1), US20140246656 (A1), US20030068526 (A1), US20050123788 (A1), US2005260449 (A1), US20060127696 (A1), US20060202194 (A1), US20070087321 (A1), US20070190359 (A1), US2007104979 (A1), US2007224450 (A1), US20080233410 (A1), US200805851 (A1), US20090039776 (A1), US20090179555 (A1), US20100090591 (A1), US20100295032 (A1), US20030072964 (A1), US20050244673 (A1), US20060008670 (A1), US20060134459 (A1), US20060251923 (A1), US20070103060 (A1), US20070231600 (A1), US2007104980 (A1), US2007278936 (A1), US20080261076 (A1), US2008161567 (A1), US20090108737 (A1),US2009085476 (A1), US20100148663 (A1), US2010102716 (A1), US2010270916 (A1), US20110204333 (A1), US2011285275 (A1), US2013033172 (A1), US2013334521 (A1), US2014103305 (A1), US2003068536 (A1), US2003085646 (A1), US2006228581 (A1), US2006197077 (A1), US2011114922 (A1), US2011114922 (A1), US2003054198 (A1), and EP2730583 (A1) is a phosphorescent material P in the context of the present invention, B A phosphorescent material that can be used is disclosed. It is understood that this does not mean that the present invention is limited to an organic electroluminescent device comprising a phosphorescent material described in one of the cited references.

[1307] As set forth in US2020274081(A1), examples of phosphorescent complexes for use in organic electroluminescent devices such as those of the present invention include the complexes shown below. Again, it is understood that the present invention is not limited to these examples.

[1308]

[1309]

[1310]

[1311]

[1312]

[1313]

[1314]

[1315]

[1316]

[1317]

[1318]

[1319] As mentioned above, a skilled technician can see that any phosphorescent complex used in the latest technology is a phosphorescent material P in the context of the present invention. B You will recognize that it may be suitable for.

[1320] In one embodiment of the present invention, each phosphorescent material P B It contains iridium (Ir).

[1321] In one embodiment of the present invention, at least one phosphorescent material P B , preferably each phosphorescent material P B is an organometallic complex containing iridium (Ir) or platinum (Pt).

[1322] In one embodiment of the present invention, at least one phosphorescent material P B , preferably each phosphorescent material P B is an organometallic complex containing iridium (Ir).

[1323] In one embodiment of the present invention, at least one phosphorescent material P B , preferably each phosphorescent material P B is an organometallic complex containing platinum (Pt).

[1324] Phosphorescent material P B Non-limiting examples of are also the following general chemical formula P B It includes compounds represented by -I.

[1325]

[1326] Chemical formula P B -I.

[1327] Chemical formula P B In -I, M is selected from the group consisting of Ir, Pt, Au, Eu, Ru, Re, Ag and Cu;

[1328] n is an integer from 1 to 3; and

[1329] X2 and Y 1 They together form bidentate monoanionic ligands independently of each other in each case.

[1330] In one embodiment of the present invention, each phosphorescent material P B is the following chemical formula P B It includes or consists of a structure according to -I.

[1331]

[1332] Chemical formula P B -I,

[1333] Here, M is selected from the group consisting of Ir, Pt, Pd, Au, Eu, Ru, Re, Ag, and Cu;

[1334] n is an integer from 1 to 3; and

[1335] X 2 and Y 1 They together form bidentate monoanionic ligands independently of each other in each case.

[1336] Chemical formula P B Examples of compounds represented by -I are the following general chemical formula P B -II or general chemical formula P B Includes compounds represented by -III:

[1337]

[1338] Chemical formula P B -II Chemical Formula P B -III.

[1339] Chemical formula P B -II and P B In -III, X' is an aromatic ring bonded to M by carbon (C), and Y' is a ring formed by nitrogen (N) coordination to M.

[1340] X' and Y' combine, and X' and Y' can form a new ring. Chemical formula P B In -III, Z3 is a bidentate ligand having two oxygen (O) groups. Chemical formula P B -II and P B In -III, M is preferably Ir in terms of high efficiency and long lifespan.

[1341] Chemical formula P B -II and P B In -III, the aromatic ring X' is, for example, C6-C 30 -aryl, preferably C6-C 16 -aryl, more preferably C6-C 12 -aryl, particularly preferably C 6- C 10 - It is an aryl, where X' is optionally one or more substituents R in each case. E It is replaced with.

[1342] Chemical formula P B -II and P B In -III, Y' is, for example, C2-C 30 -Heteroaryl, preferably C2-C 25 -Heteroaryl, more preferably C2-C 20 -Heteroaryl, more preferably C2-C 15 - It is heteroaryl, and particularly preferably C2-C 10 - It is heteroaryl, where Y' is optionally one or more substituents R in each case. E It is replaced by. Also, Y' is, for example, optionally one or more substituents R E It can be a C1-C5-heteroaryl substituted with

[1343] Chemical formula P B -II and P B In -III, the bidentate ligand Z having two oxygen (O) groups 3 is, for example, a C2-C with two oxygen atoms. 30 - Bidentate ligand, C2-C with 2 oxygen atoms 25 - Bidentate ligand, more preferably a C2-C having two oxygen atoms 20- Bidentate ligand, more preferably a C2-C having two oxygen atoms 15 - Bidentate ligands, particularly preferably C2-C having two oxygen atoms 10 - It is a bidentate ligand, where Z 3 In each case, one or more substituents R E It is replaced by. Also, Z 3 is, for example, optionally one or more substituents R E It can be a C2-C5-bidentate ligand having two oxygen atoms that are substituted.

[1344] R E In each case, independently of each other, hydrogen, deuterium, N(R 5E )2, OR 5E ,

[1345] SR 5E , Si(R 5E )3, CF3, CN, halogen,

[1346] C1-C 40 -alkyl, which has one or more substituents R 5E It is optionally substituted with, where one or more non-adjacent CH2 groups are R 5E C=CR 5E , C≡C, Si(R 5E )2, Ge(R 5E )2, Sn(R 5E )2, C=O, C=S, C=Se, C=NR 5E , P(=O)(R 5E ), SO, SO2, NR 5E , O, S or CONR 5E Optionally replaced with;

[1347] C1-C 40 - Alkylthio group, which is one or more substituents R 5E It is optionally substituted with, where one or more non-adjacent CH2 groups are R 5E C=CR 5E , C≡C, Si(R 5E )2, Ge(R 5E )2, Sn(R5E )2, C=O, C=S, C=Se, C=NR 5E , P(=O)(R 5E ), SO, SO2, NR 5E , O, S or CONR 5E Optionally replaced with;

[1348] C6-C 60 -Aryl, which has one or more substituents R 5E Optionally substituted as; and

[1349] C3-C 57 - Heteroaryl, which has one or more substituents R 5E Optionally replaced with;

[1350] It is selected from a group consisting of.

[1351] R 5E In each case, independently of one another, hydrogen, deuterium, N(R 6E )2, OR 6E , SR 6E , Si(R 6E )3, CF3, CN, F,

[1352] C1-C 40 -alkyl, which has one or more substituents R 6E It is optionally substituted with, where one or more non-adjacent CH2 groups are R 6E C=CR 6E , C≡C, Si(R 6E )2, Ge(R 6E )2, Sn(R 6E )2, C=O, C=S, C=Se, C=NR 6E , P(=O)(R 6E ), SO, SO2, NR 6E , O, S or CONR 6E Optionally replaced with;

[1353] C6-C 60 -Aryl, which has one or more substituents R 6E Optionally substituted as; and

[1354] C3-C 57- Heteroaryl, which has one or more substituents R 6E Optionally replaced with;

[1355] It is selected from a group consisting of.

[1356] R 6E In each case, independently of each other, hydrogen, deuterium, OPh, CF3, CN, F,

[1357] C1-C5-alkyl, wherein one or more hydrogen atoms are optionally substituted independently by deuterium, CN, CF3, or F;

[1358] C1-C5-alkoxy,

[1359] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[1360] C1-C5-thioalkoxy,

[1361] Here, one or more hydrogen atoms are optionally substituted by deuterium, CN, CF3, or F independently of each other;

[1362] C6-C 18 -aryl, which is optionally substituted with one or more C1-C5-alkyl substituents;

[1363] C3-C 17 -Heteroaryl,

[1364] This is optionally substituted with one or more C1-C5-alkyl substituents;

[1365] N(C6-C 18 -Aril)2;

[1366] N(C3-C 17 -heteroaryl)2, and

[1367] N(C3-C 17 -heteroaryl)(C6-C 18 -Aril);

[1368] It is selected from a group consisting of.

[1369] Substituent R E , R 5E , or R6E is independently and selectively one or more substituents R E , R 5E , R 6E and / or X', Y' and Z 3 It can form monocyclic or polycyclic, aliphatic, aromatic, heteroaromatic and / or benzo-fused ring systems together with.

[1370] Chemical formula P B Examples of compounds represented by -II include Ir(ppy)3, Ir(ppy)2(acac), Ir(mppy)3, Ir(PPy)2(m-bppy), and BtpIr(acac), Ir(btp)2(acac), Ir(2-phq)3, Hex-Ir(phq)3, Ir(fbi)2(acac), fac-Tris(2-(3-p-xylyl)phenyl)pyridine iridium(III), Eu(dbm)3(Phen), Ir(piq)3, Ir(piq)2(acac), Ir(Fiq)2(acac), Ir(Flq)2(acac), Ru(dtb-bpy) 3· 2(PF6), Ir(2-phq)3, Ir(BT)2(acac), Ir(DMP)3, Ir(Mpq) 3, There are Ir(phq)2tpy, fac-Ir(ppy)2Pc, Ir(dp)PQ2, Ir(Dpm)(Piq)2, Hex-Ir(piq)2(acac), Hex-Ir(piq)3, Ir(dmpq)3, Ir(dmpq)2(acac), FPQIrpic, etc.

[1371] Chemical formula P B Another example of a compound represented by -II is the following chemical formula P B -II-1 to P B It includes compounds represented by -II-11. In the structural formula, "Me" represents a methyl group.

[1372]

[1373]

[1374]

[1375] Chemical formula P B Another example of a compound represented by -III is the following chemical formula P B -III-1 to P B It includes compounds represented as -III-6. In the structural formula, "Me" represents a methyl group.

[1376]

[1377] In addition, iridium complexes described in US2003017361(A1), US2004262576(A1), WO2010027583(A1), US2019245153(A1), US2013119354(A1), and US2019233451(A1) may be used. From the perspective of high efficiency of phosphorescent materials, Ir(ppy)3 and Hex-Ir(ppy)3 are frequently used for green emission.

[1378] Small FWHM emitter S B

[1379] Small full width at half maximum (FWHM) emitter S according to the present invention B can generally be any emitter having an emission spectrum in which the measured FWHW in a spin-coated film having 1 to 5 wt%, particularly 2 wt% emitter in poly(methyl methacrylate) PMMA at room temperature (i.e., (approx.) 20°C) is 0.25 eV or less (≤ 0.25). Alternatively, a small FWHM emitter S B The emission spectrum of is generally the emitter S at 0.001–0.2 mg / mL in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B It can be measured in a solution containing it.

[1380] In a preferred embodiment of the present invention, a small FWHM emitter S B is 1 to 5 weight%, particularly 2 weight%, of emitter S in PMMA at room temperature. BAny emitter having an emission spectrum exhibiting an FWHM of ≤ 0.24 eV, more preferably ≤ 0.23 eV, even more preferably ≤ 0.22 eV, ≤ 0.21 eV, or ≤ 0.20 eV measured from a raw spin-coated film. Alternatively, a small FWHM emitter S B The emission spectrum of is generally the emitter S at 0.001–0.2 mg / mL in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B It can be measured in a solution containing. In another embodiment of the present invention, each small FWHM emitter S B represents an FWHM of ≤ 0.19 eV, ≤ 0.18 eV, ≤ 0.17 eV, ≤ 0.16 eV, ≤ 0.15 eV, ≤ 0.14 eV, ≤ 0.13 eV, ≤ 0.12 eV, or ≤ 0.11 eV.

[1381] In one embodiment of the present invention, each small FWHM emitter S B is (1 to 5 weight%, particularly 2 weight% of emitters S B (L) When measured in PMMA at room temperature, it emits maximum light in the wavelength range of 440 nm to 470 nm.

[1382] In one embodiment of the present invention, each small FWHM emitter S B is (1 to 5 weight%, particularly 2 weight% of emitters S B (L) When measured in PMMA at room temperature, it emits maximum light in the wavelength range of 500 nm to 560 nm.

[1383] In one embodiment of the present invention, each small FWHM emitter S B is (1 to 5 weight%, particularly 2 weight% of emitters S B (L) When measured in PMMA at room temperature, it emits maximum light in the wavelength range of 610 nm to 665 nm.

[1384] In one embodiment of the present invention, each small FWHM emitter S Bis 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B When measured, it emits light with maximum emission in the wavelength range of 440 nm to 470 nm.

[1385] In one embodiment of the present invention, each small FWHM emitter S B is 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B When measured, it emits light with maximum emission in the wavelength range of 500 nm to 560 nm.

[1386] In one embodiment of the present invention, each small FWHM emitter S B is 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B When measured, it emits maximum light in the wavelength range of 610 nm to 665 nm.

[1387] TADF material E included in the light-emitting layer B of the organic electroluminescent device according to the present invention B may optionally also be an emitter having a emission spectrum exhibiting a FWHM of 0.25 eV or less (≤ 0.25 eV). Optionally, TADF material E included in the emissive layer B of the organic electroluminescent device according to the present invention. B It can also exhibit maximum luminescence within the wavelength range specified above (i.e., 400 nm to 470 nm, 500 nm to 560 nm, 610 nm to 665 nm).

[1388] In one embodiment of the present invention, one of the relationships expressed by the following formulas (23) to (25) is applied:

[1389] 440nm < λ max (S B ) < 470nm (23)

[1390] 510nm < λ max (SB ) < 550nm (24)

[1391] 610nm < λ max (S B ) < 665nm (25),

[1392] Here, λ max (S B ) is a small FWHM emitter S in the context of the present invention B It indicates the maximum luminescence of.

[1393] In one embodiment, the aforementioned relationship expressed by formulas (23) to (25) is applied to a material included in any one of at least one light-emitting layer B of an organic electroluminescent device according to the present invention. In one embodiment, the aforementioned relationship expressed by formulas (23) to (25) is applied to a material included in the same light-emitting layer B of an organic electroluminescent device according to the present invention.

[1394] In a preferred embodiment of the present invention, each small FWHM emitter S B is an organic emitter, which means that, in the context of the present invention, it does not contain any transition metal. Preferably, a small FWHM emitter S according to the present invention B It is mainly composed of hydrogen (H), carbon (C), nitrogen (N), and boron (B) elements, but may also include, for example, oxygen (O), silicon (Si), fluorine (F), and bromine (Br).

[1395] In a preferred embodiment of the present invention, a small FWHM emitter S B is a fluorescent emitter, which means that in the context of the present invention (e.g., in a photoelectronic device according to the present invention), the emitter can emit light at room temperature upon electron excitation, and the light-emitting excitation state is a singlet state.

[1396] In one embodiment of the present invention, a small FWHM emitter S B is (1 to 5 weight%, particularly 2 weight% of emitter S B(L) When measured in PMMA at room temperature, it exhibits a photoluminescence quantum yield (PLQY) of 50% or more.

[1397] In a preferred embodiment of the present invention, a small FWHM emitter S B is 1 to 5 weight%, particularly 2 weight%, of emitter S in PMMA at room temperature. B When measured, it exhibits a photoluminescence quantum yield (PLQY) of 60% or more.

[1398] In a more preferred embodiment of the present invention, a small FWHM emitter S B is (1 to 5 weight%, particularly 2 weight% of emitter S B (L) When measured in PMMA at room temperature, it exhibits a photoluminescence quantum yield (PLQY) of 70% or more.

[1399] In a more preferred embodiment of the present invention, a small FWHM emitter S B is (1 to 5 weight%, particularly 2 weight% of emitter S B (L) When measured in PMMA at room temperature, it exhibits a photoluminescence quantum yield (PLQY) of 80% or more.

[1400] In a particularly preferred embodiment of the present invention, a small FWHM emitter S B is (1 to 5 weight%, particularly 2 weight% of emitter S B (L) When measured in PMMA at room temperature, it exhibits a photoluminescence quantum yield (PLQY) of over 90%.

[1401] In one embodiment of the present invention, a small FWHM emitter S B is 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of 50% or more.

[1402] In a preferred embodiment of the present invention, a small FWHM emitter S Bis 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of 60% or more.

[1403] In a more preferred embodiment of the present invention, a small FWHM emitter S B is 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of 70% or more.

[1404] In a more preferred embodiment of the present invention, a small FWHM emitter S B is 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of over 80%.

[1405] In a particularly preferred embodiment of the present invention, a small FWHM emitter S B is 0.001–0.2 mg / mL emitter S in dichloromethane or toluene at room temperature (i.e., (approx.) 20°C). B It exhibits a photoluminescence quantum yield (PLQY) of over 90% when measured.

[1406] A person skilled in the art will find a small FWHM emitter S that meets the aforementioned requirements or desirable features. B I know how to design it.

[1407] Small FWHM emitter S in the context of the present invention BA class of molecules suitable for providing [this] is the well-known 4,4-difluoro-4-violet-3a,4a-diaza-s-indacene (BODIPY)-based material, and its structural features and applications in organic electroluminescent devices have been examined in detail and are common knowledge to those skilled in the art. Recent technology also demonstrates how these materials are synthesized and how emitters with specific emission colors are reached.

[1408] For example, see the following: J. Liao, Y. Wang, Y. Xu, H. Zhao, X. Xiao, X. Yang, Tetrahedron 2015, 71(31), 5078, DOI: 10.1016 / j.tet.2015.05.054; BM Squeo, M. Pasini, Supramolecular Chemistry 2020, 32(1), 56-70, DOI: 10.1080 / 10610278.2019.1691727; M. Poddar, R. Misra, Coordination Chemistry Reviews 2020, 421, 213462-213483; DOI: 10.1016 / j.ccr.2020.213462.

[1409] A skilled technician also [is] the basic BODIPY structure shown below

[1410]

[1411] For example, we are familiar with the fact that it is not ideally suitable as an emitter for organic electroluminescent devices due to intermolecular ð-ð interactions and associated self-quenching.

[1412] It is common knowledge to those skilled in the art that by attaching bulky groups as substituents to the BODIPY core structure shown above, emitter molecules more suitable for organic electroluminescent devices can be obtained. These bulky groups may be, for example (among many others), aryl, heteroaryl, alkyl, or alkoxy substituents, or condensed polycyclic aromatic or heteroaromatic groups, all of which may be selectively substituted. The selection of suitable substituents for the BODIPY core is obvious to a skilled technician and can be easily derived from the latest technology. The same applies to the numerous synthetic routes established for the synthesis and subsequent modification of such molecules.

[1413] For example, see the following: BM Squeo, M. Pasini, Supramolecular Chemistry 2020, 32(1), 56-70, DOI: 10.1080 / 10610278.2019.1691727; M. Poddar, R. Misra, Coordination Chemistry Reviews 2020, 421, 213462-213483; DOI: 10.1016 / j.ccr.2020.213462.

[1415] Small FWHM emitter S in the context of the present invention B Examples of BODIPY-based emitters suitable for this purpose are shown below:

[1416]

[1417]

[1418] This is a BODIPY derivative having structural features different from those shown above, a small FWHM emitter S in the context of the present invention B It is understood that this does not mean it is not suitable.

[1419] For example, BODIPY-derived structures or derivatives thereof disclosed in US2020251663(A1), EP3671884(A1), US20160230960(A1), and US20150303378(A1) are small FWHM emitters S suitable for use according to the present invention. B It could be.

[1420] In addition, it is known to those skilled in the art that emitters for organic electroluminescent devices can be obtained by replacing one or both of the fluorine substituents attached to the central boron atom of the BODIPY core structure with an alkoxy or aryloxy group that is attached via an oxygen atom and can be optionally substituted with an electron-withdrawing substituent such as fluorine (F) or trifluoromethyl (CF3). Such molecules are disclosed, for example, in US2012037890(A1), and those skilled in the art know that such BODIPY-related compounds are also suitable small FWHM emitters S in the context of the present invention. B It is understood that this may be the case. Examples of such emitter molecules are shown below, and it is understood that only the presented structure is suitable for the context of the present invention for small FWHM emitter S. B It does not mean that it could be:

[1421]

[1422] In addition, the boron-containing emitter related to BODIPY disclosed in US20190288221(A1) is a small FWHM emitter S suitable for use according to the present invention. B It constitutes a group of emitters capable of providing.

[1423] Small FWHM emitter S in the context of the present invention B Another class of molecules suitable for providing is the near-range charge-transfer (NRCT) emitter.

[1424] Typical NRCT emitters are described in the literature as exhibiting delayed components in time-resolved photoluminescence spectra and showing near-field HOMO-LUMO separation. Refer to the following example: T. Hatakeyama, K. Shiren, K. Nakajima, S. Nomura, S. Nakatsuka, K. Kinoshita, J. Ni, Y. Ono, and T. Ikuta, Advanced Materials 2016 , 28 (14), 2777, DOI: 10.1002 / adma.201505491.

[1425] A typical NRCT emitter exhibits only one emission band in the emission spectrum, while a typical fluorescent emitter exhibits several distinct emission bands due to vibrational progression.

[1426] A skilled technician [regarding] the small FWHM emitter S in the context of the present invention B We know how to design and synthesize an NRCT emitter that may be suitable as. For example, the emitter disclosed in EP3109253(A1) is a small FWHM emitter S in the context of the present invention. B It can be used as.

[1427] Also, for example, US2014058099 (A1), US2009295275 (A1), US2012319052 (A1), EP2182040 (A2), US2018069182 (A1), US2019393419 (A1), US2020006671 (A1), US2020098991 (A1), US2020176684 (A1), US2020161552 (A1), US2020227639 (A1), US2020185635 (A1), EP3686206 (A1), EP3686206 (A1), WO2020217229 (A1), WO2020208051 (A1), and US2020328351 (A1) is a small FWHM emitter S for use according to the present inventionB An emitter material suitable for use is disclosed.

[1428] Small FWHM emitter S in the context of the present invention B A group of emitters that can be used is a boron (B) containing emitter that includes or is composed of a structure according to the following chemical formula DABNA-I:

[1429]

[1430] DABNA-I,

[1431] Here

[1432] Each ring A', ring B', and ring C' independently represents an aromatic or heteroaromatic ring each containing 5 to 24 ring atoms, wherein in the case of the heteroaromatic ring, 1 to 3 ring atoms are independently heteroatoms selected from N, O, S, and Se; and here

[1433] In each aromatic or heteroaromatic ring A', B', and C', one or more hydrogen atoms are optionally and independently of each other substituent R DABNA-1 It is substituted by deuterium, N(R) independently of each other in each case. DABNA-2 )2, OR DABNA-2 , SR DABNA-2 , Si(R DABNA-2 )3, B(OR DABNA-2 )2, OSO2R DABNA-2 , CF3, CN, halogen(F, Cl, Br, I),

[1434] C1-C 40 -alkyl,

[1435] This optionally includes one or more substituents R DABNA-2 Replaced with, and

[1436] Here, one or more non-adjacent CH2 groups are optionally R DABNA-2 C=CR DABNA-2 , C≡C, Si(R DABNA-2 )2, Ge(R DABNA-2)2, Sn(R DABNA-2 )2, C=O, C=S, C=Se, C=NR DABNA-2 , P(=O)(R DABNA-2 ), SO, SO2, NR DABNA-2 , O, S or CONR DABNA-2 Replaced with;

[1437] C1-C 40 - Alkoxy,

[1438] This optionally includes one or more substituents R DABNA-2 Replaced with, and

[1439] Here, one or more non-adjacent CH2 groups are optionally R DABNA-2 C=CR DABNA-2 , C≡C, Si(R DABNA-2 )2, Ge(R DABNA-2 )2, Sn(R DABNA-2 )2, C=O, C=S, C=Se, C=NR DABNA-2 , P(=O)(R DABNA-2 ), SO, SO2, NR DABNA-2 , O, S or CONR DABNA-2 Replaced with;

[1440] C1-C 40 -Thioalkoxy,

[1441] This optionally includes one or more substituents R DABNA-2 Replaced with, and

[1442] Here, one or more non-adjacent CH2 groups are optionally R DABNA-2 C=CR DABNA-2 , C≡C, Si(R DABNA-2 )2, Ge(R DABNA-2 )2, Sn(R DABNA-2 )2, C=O, C=S, C=Se, C=NR DABNA-2 , P(=O)(R DABNA-2 ), SO, SO2, NR DABNA-2 , O, S or CONR DABNA-2 Replaced with;

[1443] C2-C 40 -Alkenil,

[1444] This optionally includes one or more substituents R DABNA-2 Replaced with, and

[1445] Here, one or more non-adjacent CH2 groups are optionally R DABNA-2 C=CR DABNA-2 , C≡C, Si(R DABNA-2 )2, Ge(R DABNA-2 )2, Sn(R DABNA-2 )2, C=O, C=S, C=Se, C=NR DABNA-2 , P(=O)(R DABNA-2 ), SO, SO2, NR DABNA-2 , O, S or CONR DABNA-2 Replaced with;

[1446] C2-C 40 -Alkinil,

[1447] This optionally includes one or more substituents R DABNA-2 Replaced with, and

[1448] Here, one or more non-adjacent CH2 groups are optionally R DABNA-2 C=CR DABNA-2 , C≡C, Si(R DABNA-2 )2, Ge(R DABNA-2 )2, Sn(R DABNA-2 )2, C=O, C=S, C=Se, C=NR DABNA-2 , P(=O)(R DABNA-2 ), SO, SO2, NR DABNA-2 , O, S or CONR DABNA-2 Replaced with;

[1449] C6-C 60 -Aril,

[1450] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1451] C3-C 57 -Heteroaryl,

[1452] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1453] and an aliphatic cyclic amine comprising 4 to 18 carbon atoms and 1 to 3 nitrogen atoms;

[1454] Selected from a group composed of,

[1455] R DABNA-2 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-6 )2, OR DABNA-6 , SR DABNA-6 , Si(R DABNA-6 )3, B(OR DABNA-6 )2, OSO2R DABNA-6 , CF3, CN, halogen(F, Cl, Br, I),

[1456] C1-C5-alkyl,

[1457] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1458] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1459] C1-C5-alkoxy,

[1460] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1461] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(RDABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1462] C1-C5-thioalkoxy,

[1463] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1464] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1465] C2-C5-alkenyl,

[1466] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1467] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1468] C2-C5-alkynyl,

[1469] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1470] Here, one or more non-adjacent CH2 groups are optionally RDABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1471] C6-C 18 -Aril,

[1472] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1473] C3-C 17 -Heteroaryl,

[1474] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1475] and an aliphatic cyclic amine comprising 4 to 18 carbon atoms and 1 to 3 nitrogen atoms;

[1476] Selected from a group composed of,

[1477] Here, R DABNA-1 and R DABNA-2 Two or more adjacent substituents selected from form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system fused to an adjacent ring A', B' or C', wherein the fused ring system thus formed (i.e., each ring A', B' or C' and additional ring(s) optionally fused thereto) comprises a total of 8 to 30 ring atoms;

[1478] Y a and Y b is independently directly (single) coupled, NR DABNA-3 , O, S, C(R DABNA-3 )2, Si(R DABNA-3 )2, BR DABNA-3Selected from , and Se;

[1479] R DABNA-3 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-4 )2, OR DABNA-4 , SR DABNA-4 , Si(R DABNA-4 )3, B(OR DABNA-4 )2, OSO2R DABNA-4 , CF3, CN, halogen(F, Cl, Br, I),

[1480] C1-C 40 -alkyl,

[1481] This optionally includes one or more substituents R DABNA-4 Replaced with, and

[1482] Here, one or more non-adjacent CH2 groups are R DABNA-4 C=CR DABNA-4 , C≡C, Si(R DABNA-4 )2, Ge(R DABNA-4 )2, Sn(R DABNA-4 )2, C=O, C=S, C=Se, C=NR DABNA-4 , P(=O)(R DABNA-4 ), SO, SO2, NR DABNA-4 , O, S or CONR DABNA-4 Replaced with;

[1483] C1-C 40 - Alkoxy,

[1484] This optionally includes one or more substituents R DABNA-4 Replaced with, and

[1485] Here, one or more non-adjacent CH2 groups are R DABNA-4 C=CR DABNA-4 , C≡C, Si(R DABNA-4 )2, Ge(R DABNA-4 )2, Sn(R DABNA-4 )2, C=O, C=S, C=Se, C=NR DABNA-4 , P(=O)(R DABNA-4 ), SO, SO2, NR DABNA-4 , O, S or CONR DABNA-4 Replaced with;

[1486] C1-C 40 -Thioalkoxy,

[1487] This optionally includes one or more substituents R DABNA-4 Replaced with, and

[1488] Here, one or more non-adjacent CH2 groups are R DABNA-4 C=CR DABNA-4 , C≡C, Si(R DABNA-4 )2, Ge(R DABNA-4 )2, Sn(R DABNA-4 )2, C=O, C=S, C=Se, C=NR DABNA-4 , P(=O)(R DABNA-4 ), SO, SO2, NR DABNA-4 , O, S or CONR DABNA-4 Replaced with;

[1489] C2-C 40 -Alkenil,

[1490] This optionally includes one or more substituents R DABNA-4 Replaced with, and

[1491] Here, one or more non-adjacent CH2 groups are R DABNA-4 C=CR DABNA-4 , C≡C, Si(R DABNA-4 )2, Ge(R DABNA-4 )2, Sn(R DABNA-4 )2, C=O, C=S, C=Se, C=NR DABNA-4 , P(=O)(R DABNA-4 ), SO, SO2, NR DABNA-4 , O, S or CONR DABNA-4 Replaced with;

[1492] C2-C 40 -Alkinil,

[1493] This optionally includes one or more substituents R DABNA-4 Replaced with, and

[1494] Here, one or more non-adjacent CH2 groups are R DABNA-4 C=CR DABNA-4 , C≡C, Si(R DABNA-4)2, Ge(R DABNA-4 )2, Sn(R DABNA-4 )2, C=O, C=S, C=Se, C=NR DABNA-4 , P(=O)(R DABNA-4 ), SO, SO2, NR DABNA-4 , O, S or CONR DABNA-4 Replaced with;

[1495] C6-C 60 -Aril,

[1496] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1497] C3-C 57 -Heteroaryl,

[1498] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1499] and an aliphatic cyclic amine comprising 4 to 18 carbon atoms and 1 to 3 nitrogen atoms;

[1500] Selected from a group composed of,

[1501] R DABNA-4 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-5 )2, OR DABNA-5 , SR DABNA-5 , Si(R DABNA-5 )3, B(OR DABNA-5 )2, OSO2R DABNA-5 , CF3, CN, halogen(F, Cl, Br, I),

[1502] C1-C 40 -alkyl,

[1503] This optionally includes one or more substituents R DABNA-5 Replaced with, and

[1504] Here, one or more non-adjacent CH2 groups are R DABNA-5 C=CR DABNA-5 , C≡C, Si(R DABNA-5 )2, Ge(R DABNA-5 )2, Sn(R DABNA-5)2, C=O, C=S, C=Se, C=NR DABNA-5 , P(=O)(R DABNA-5 ), O, S or CONR DABNA-5 Replaced with;

[1505] C1-C 40 - Alkoxy,

[1506] This optionally includes one or more substituents R DABNA-5 Replaced with, and

[1507] Here, one or more non-adjacent CH2 groups are R DABNA-5 C=CR DABNA-5 , C≡C, Si(R DABNA-5 )2, Ge(R DABNA-5 )2, Sn(R DABNA-5 )2, C=O, C=S, C=Se, C=NR DABNA-5 , P(=O)(R DABNA-5 ), O, S or CONR DABNA-5 Replaced with;

[1508] C1-C 40 -Thioalkoxy,

[1509] This optionally includes one or more substituents R DABNA-5 Replaced with, and

[1510] Here, one or more non-adjacent CH2 groups are R DABNA-5 C=CR DABNA-5 , C≡C, Si(R DABNA-5 )2, Ge(R DABNA-5 )2, Sn(R DABNA-5 )2, C=O, C=S, C=Se, C=NR DABNA-5 , P(=O)(R DABNA-5 ), O, S or CONR DABNA-5 Replaced with;

[1511] C2-C 40 -Alkenil,

[1512] This optionally includes one or more substituents R DABNA-5 Replaced with, and

[1513] Here, one or more non-adjacent CH2 groups are R DABNA-5C=CR DABNA-5 , C≡C, Si(R DABNA-5 )2, Ge(R DABNA-5 )2, Sn(R DABNA-5 )2, C=O, C=S, C=Se, C=NR DABNA-5 , P(=O)(R DABNA-5 ), O, S or CONR DABNA-5 Replaced with;

[1514] C2-C 40 -Alkinil,

[1515] This optionally includes one or more substituents R DABNA-5 Replaced with, and

[1516] Here, one or more non-adjacent CH2 groups are R DABNA-5 C=CR DABNA-5 , C≡C, Si(R DABNA-5 )2, Ge(R DABNA-5 )2, Sn(R DABNA-5 )2, C=O, C=S, C=Se, C=NR DABNA-5 , P(=O)(R DABNA-5 ), O, S or CONR DABNA-5 Replaced with;

[1517] C6-C 60 -Aril,

[1518] This optionally includes one or more substituents R DABNA-5 Replaced with;

[1519] C3-C 57 -Heteroaryl,

[1520] This optionally includes one or more substituents R DABNA-5 Replaced with;

[1521] and an aliphatic cyclic amine comprising 4 to 18 carbon atoms and 1 to 3 nitrogen atoms;

[1522] Selected from a group composed of,

[1523] R DABNA-5 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-6 )2, OR DABNA-6 , SRDABNA-6 , Si(R DABNA-6 )3, B(OR DABNA-6 )2, OSO2R DABNA-6 , CF3, CN, halogen(F, Cl, Br, I),

[1524] C1-C5-alkyl,

[1525] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1526] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1527] C1-C5-alkoxy,

[1528] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1529] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1530] C1-C5-thioalkoxy,

[1531] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1532] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1533] C2-C5-alkenyl,

[1534] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1535] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6 Replaced with;

[1536] C2-C5-alkynyl,

[1537] This optionally includes one or more substituents R DABNA-6 Replaced with, and

[1538] Here, one or more non-adjacent CH2 groups are optionally R DABNA-6 C=CR DABNA-6 , C≡C, Si(R DABNA-6 )2, Ge(R DABNA-6 )2, Sn(R DABNA-6 )2, C=O, C=S, C=Se, C=NR DABNA-6 , P(=O)(R DABNA-6 ), SO, SO2, NR DABNA-6 , O, S or CONR DABNA-6Replaced with;

[1539] C6-C 18 -Aril,

[1540] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1541] C3-C 17 -Heteroaryl,

[1542] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1543] and an aliphatic cyclic amine comprising 4 to 18 carbon atoms and 1 to 3 nitrogen atoms;

[1544] Selected from a group composed of,

[1545] Here, R DABNA-3 , R DABNA-4 and R DABNA-5 Two or more adjacent substituents selected from optionally form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system with each other, wherein optionally the fused ring system thus formed comprises a total of 8 to 30 ring atoms;

[1546] R DABNA-6 In each case, independently of each other are hydrogen, deuterium, OPh (Ph = phenyl), SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3,

[1547] C1-C5-alkyl,

[1548] Here, optionally, one or more hydrogen atoms are independently substituted with deuterium, Ph, CN, CF3, or F;

[1549] C1-C5-alkoxy,

[1550] Here, optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[1551] C1-C5-thioalkoxy,

[1552] Here, optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[1553] C2-C5-alkenyl,

[1554] Here, optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[1555] C2-C5-alkynyl,

[1556] Here, optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[1557] C6-C 18 -Aril,

[1558] Here, optionally, one or more hydrogen atoms are deuterium, CN, CF3, F, C1-C5-alkyl, SiMe3, SiPh3, or C6-C 18 - Independently substituted by aryl substituents;

[1559] C3-C 17 -Heteroaryl,

[1560] Here, optionally, one or more hydrogen atoms are deuterium, CN, CF3, F, C1-C5-alkyl, SiMe3, SiPh3, or C6-C 18 - Independently substituted by aryl substituents;

[1561] N(C6-C 18 -Aril)2,

[1562] ( C3-C 17 -heteroaryl)2; and

[1563] ( C3-C 17 -heteroaryl)(C6-C 18 -Aril);

[1564] Selected from a group composed of,

[1565] Here, Y a and Y b One of or Y a and Y bBoth of them are NR DABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2, or BR DABNA-3 In the case where the above one or two substituents R DABNA- 3 are optionally and independently of each other adjacent rings A' and B' (Y a = N RDABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2, or BR DABNA-3 ) or A' and C'(Y b = NR DABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2, or BR DABNA-3 Direct (single) coupling to one or both of ) or, in each case, independently NR DABNA-1 , O, S, C(R DABNA-1 )2, Si(R DABNA-1 )2, BR DABNA-1 and can be bonded through a connecting atom or group of atoms selected from Se;

[1566] Herein, optionally, two or more, preferably two structures of the formula DABNA-I are joined together, preferably fused together by sharing at least one, more preferably exactly one bond;

[1567] Herein optionally, two or more, preferably two, structures of formula DABNA-I are present in the emitter, sharing at least one, preferably exactly one, aromatic or heteroaromatic ring (i.e., this ring may be part of both structures of formula DABNA-I), and this ring is preferably any one of rings A', B', and C' of formula DABNA-I, but also R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 , and R DABNA-6 , especially R DABNA-3It may be any aromatic or heteroaromatic substituent selected from, or any aromatic or heteroaromatic ring formed by two or more adjacent substituents as described above, wherein the covalent ring may constitute the same or different moiety of two or more structures of formula DABNA-I sharing said ring (i.e., the covalent ring may be, for example, ring C' of both structures of formula DABNA-I optionally included in the emitter, or the covalent ring may be, for example, ring B' of one structure of formula DABNA-I and ring C' of the other structure optionally included in the emitter);

[1568] Here, optionally at least one R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 is replaced by a bond to an additional chemical entity of the formula DABNA-I / or is optionally replaced with at least one R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 At least one hydrogen atom of is replaced by a bond to an additional chemical entity of the chemical formula DABNA-I.

[1569] In one embodiment of the present invention, at least one, preferably in each light-emitting layer B, one or more small FWHM emitters S B At least one of them includes a structure according to the chemical formula DABNA-I.

[1570] In one embodiment of the present invention, in at least one, preferably each light-emitting layer B, each small FWHM emitter S B It includes a structure according to the chemical formula DABNA-I.

[1571] In one embodiment of the present invention, at least one, preferably in each light-emitting layer B, one or more small FWHM emitters S B At least one of them consists of a structure according to the chemical formula DABNA-I.

[1572] In one embodiment of the present invention, in at least one, preferably each light-emitting layer B, each small FWHM emitter S B It consists of a structure according to the chemical formula DABNA-I.

[1573] In a preferred embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B is composed of or contains a structure according to the chemical formula DABNA-I, where A', B' and C' are all aromatic rings each having 6 ring atoms (i.e., all are benzene rings).

[1574] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, where Y a and Y b NR independently of each other DABNA-3 , O, S, C(R DABNA-3 )2, and Si(R DABNA-3 Selected from )2.

[1575] In a preferred embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, where Y a and Y b NR independently of each other DABNA-3 , is selected from O and S.

[1576] In a more preferred embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, where Y a and Y b NR independently of each other DABNA-3 and is selected from O.

[1577] In a particularly preferred embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, where Y a and Y b All are NR DABNA-3 am.

[1578] In a particularly preferred embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, where Y a and Y b are independently identical to each other, and all are NR DABNA-3 am.

[1579] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1580] R DABNA-1 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-2 )2, OR DABNA-2 , SR DABNA-2 , Si(R DABNA-2)3, CF3, CN, F,

[1581] C1-C5-alkyl,

[1582] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1583] C1-C5-alkoxy,

[1584] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1585] C1-C5-thioalkoxy,

[1586] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1587] C6-C 18 -Aril,

[1588] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1589] C3-C 17 -Heteroaryl,

[1590] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1591] Selected from a group composed of;

[1592] R DABNA-2 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-6 )2, OR DABNA-6 , SR DABNA-6 , Si(R DABNA-6 )3, CF3, CN, F,

[1593] C1-C5-alkyl,

[1594] This optionally includes one or more substituents R DABNA62 Replaced with;

[1595] C6-C 18 -Aril,

[1596] This optionally includes one or more substituents R DABNA62 Replaced with;

[1597] C3-C17 -Heteroaryl,

[1598] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1599] Selected from a group composed of;

[1600] Here, R DABNA-1 and R DABNA-2 Two or more adjacent substituents selected from form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system fused to an adjacent ring A', B' or C', wherein the fused ring system thus formed (i.e., each ring A', B' or C' and additional ring(s) optionally fused thereto) comprises a total of 8 to 30 ring atoms.

[1601] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1602] R DABNA-1 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-2 )2, OR DABNA-2 , SR DABNA-2 , Si(R DABNA-2 )3,

[1603] C1-C5-alkyl,

[1604] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1605] C6-C 18 -Aril,

[1606] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1607] C3-C 17 -Heteroaryl,

[1608] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1609] Selected from a group composed of,

[1610] R DABNA-2 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-6 )2, OR DABNA-6 , SR DABNA-6 , Si(R DABNA-6 )3, CF3, CN, F,

[1611] C1-C5-alkyl,

[1612] This optionally includes one or more substituents R DABNA62 Replaced with;

[1613] C6-C 18 -Aril,

[1614] This optionally includes one or more substituents R DABNA62 Replaced with;

[1615] C3-C 17 -Heteroaryl,

[1616] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1617] Selected from a group composed of,

[1618] Here, R DABNA-1 and R DABNA-2 Two or more adjacent substituents selected from form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system fused to an adjacent ring A', B' or C', wherein the fused ring system thus formed (i.e., each ring A', B' or C' and additional ring(s) optionally fused thereto) comprises a total of 8 to 30 ring atoms.

[1619] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1620] R DABNA-1 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-2 )2, OR DABNA-2 , SR DABNA-2 ,

[1621] C1-C5-alkyl,

[1622] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1623] C6-C 18 -Aril,

[1624] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1625] C3-C 17 -Heteroaryl,

[1626] This optionally includes one or more substituents R DABNA-2 Replaced with;

[1627] Selected from a group composed of,

[1628] R DABNA-2 In each case, independently of each other, hydrogen, deuterium, N(Ph)2, OPh, CN, Me, i Pr, t Bu, Si(Me)3,

[1629] Ph,

[1630] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1631] C3-C 17 -Heteroaryl,

[1632] This optionally includes one or more substituents R DABNA-6 Replaced with;

[1633] Selected from a group composed of,

[1634] Here, two or more adjacent R DABNA-1 It forms a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system fused to an adjacent ring A', B' or C', wherein the fused ring system thus formed (i.e., each ring A', B' or C' and additional ring(s) optionally fused thereto) comprises a total of 8 to 30 ring atoms.

[1635] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1636] R DABNA-1 In each case, hydrogen, deuterium, N(Ph)2, OPh, Me, independently of each other i Pr, t Bu, Si(Me)3,

[1637] Ph,

[1638] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted with Bu, Ph, or CN;

[1639] C3-C 17 -Heteroaryl,

[1640] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted with Bu, Ph, or CN;

[1641] Selected from a group composed of;

[1642] Here, two or more adjacent substituents R DABNA-1It optionally forms a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system fused to an adjacent ring A', B' or C', wherein the fused ring system thus formed (i.e., each ring A', B' or C' and additional ring(s) optionally fused thereto) comprises a total of 8 to 30 ring atoms.

[1643] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1644] R DABNA-1 In each case, hydrogen, deuterium, N(Ph)2, Me, independently of each other i Pr, t Bu,

[1645] Ph,

[1646] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted with Bu, Ph, or CN;

[1647] Carbazoyl,

[1648] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted with Bu, Ph, or CN;

[1649] Triazinil,

[1650] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted with Bu, Ph, or CN;

[1651] Pyrimidinyl,

[1652] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted with Bu, Ph, or CN;

[1653] Pyridinyl,

[1654] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted with Bu, Ph, or CN;

[1655] Selected from a group composed of,

[1656] Here, two or more adjacent substituents R DABNA-1 It optionally forms a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system fused to an adjacent ring A', B' or C', wherein the fused ring system thus formed (i.e., each ring A', B' or C' and additional ring(s) optionally fused thereto) comprises a total of 8 to 30 ring atoms.

[1657] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and R DABNA-1 and R DABNA-2 The adjacent substituent selected from does not form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system fused to the adjacent ring A', B' or C'.

[1658] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1659] R DABNA-3 In each case, hydrogen, deuterium, independently of each other

[1660] C1-C4-alkyl,

[1661] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1662] C6-C 18 -Aril,

[1663] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1664] C3-C 17 -Heteroaryl,

[1665] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1666] Selected from a group composed of,

[1667] R DABNA-4 In each case, hydrogen, deuterium, and N(R) are independent of each other. DABNA-5 )2, OR DABNA-5 , SR DABNA-5 , Si(C1-C5-alkyl)3, CF3, CN, F,

[1668] C1-C5-alkyl,

[1669] This optionally includes one or more substituents R DABNA-5 Replaced with;

[1670] C6-C 18 -Aril,

[1671] This optionally includes one or more substituents R DABNA-5 Replaced with;

[1672] C3-C 17 -Heteroaryl,

[1673] This optionally includes one or more substituents R DABNA-5 Replaced with;

[1674] Selected from a group composed of;

[1675] RDABNA-5 In each case, independently of each other, hydrogen, deuterium, N(Ph)2, OPh, Si(Me)3, CF3, CN, F,

[1676] C1-C5-alkyl,

[1677] Here, one or more hydrogen atoms are optionally and independently replaced with deuterium;

[1678] C6-C 18 -Aril,

[1679] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1680] C3-C 17 -Heteroaryl,

[1681] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1682] Selected from a group composed of;

[1683] Here, R DABNA-3 , R DABNA-4 and R DABNA-5 Two or more adjacent substituents selected from optionally form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system with each other, wherein optionally the fused ring system thus formed comprises a total of 8 to 30 ring atoms;

[1684] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1685] R DABNA-3In each case, hydrogen, deuterium, independently of each other

[1686] C1-C4-alkyl,

[1687] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1688] C6-C 18 -Aril,

[1689] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1690] C3-C 17 -Heteroaryl,

[1691] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1692] Selected from a group composed of,

[1693] R DABNA-4 In each case, independently of each other, hydrogen, deuterium, N(Ph)2, OPh, Si(Me)3, CF3, CN, F,

[1694] C1-C5-alkyl,

[1695] Here, one or more hydrogen atoms are optionally and independently replaced with deuterium;

[1696] C6-C 18 -Aril,

[1697] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1698] C3-C 17 -Heteroaryl,

[1699] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1700] Selected from a group composed of,

[1701] Here, R DABNA-3 and R DABNA-4 Two or more adjacent substituents selected from do not form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system with each other.

[1702] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1703] R DABNA-3 In each case, hydrogen, deuterium, independently of each other

[1704] C1-C4-alkyl,

[1705] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1706] C6-C 18 -Aril,

[1707] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1708] C3-C 17 -Heteroaryl,

[1709] This optionally includes one or more substituents R DABNA-4 Replaced with;

[1710] Selected from a group composed of,

[1711] R DABNA-4 In each case, hydrogen, deuterium, CN, F, independently of each other

[1712] C1-C5-alkyl,

[1713] Here, one or more hydrogen atoms are optionally and independently replaced with deuterium;

[1714] C6-C 18 -Aril,

[1715] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1716] C3-C 17 -Heteroaryl,

[1717] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1718] Selected from a group composed of,

[1719] Here, R DABNA-3 and R DABNA-4 Two or more adjacent substituents selected from do not form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system with each other.

[1720] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1721] R DABNA-3 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu,

[1722] C6-C 18 -Aril,

[1723] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1724] Selected from a group composed of,

[1725] Here, R DABNA-3Two or more adjacent substituents selected from do not form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system with each other.

[1726] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1727] R DABNA-3 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu and

[1728] Ph,

[1729] Here, one or more hydrogen atoms are optionally, independently of each other, deuterium, Me, i Pr, t Substituted by Bu, Ph, or CN;

[1730] Selected from a group composed of,

[1731] Here, R DABNA-3 Two or more adjacent substituents selected from do not form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic ring system with each other.

[1732] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1733] R DABNA-6 In each case, independently of each other are hydrogen, deuterium, OPh(Ph = phenyl), SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3,

[1734] C1-C5-alkyl,

[1735] Here, optionally, one or more hydrogen atoms are independently substituted with deuterium, Ph, CN, CF3, or F;

[1736] C6-C 18 -Aril,

[1737] Here, optionally, one or more hydrogen atoms are independently deuterium, CN, CF3, F, C1-C5-alkyl, SiMe3, SiPh3, or C6-C 18 - Substituted with aryl;

[1738] C3-C 17 -Heteroaryl,

[1739] Here, optionally, one or more hydrogen atoms are independently deuterium, CN, CF3, F, C1-C5-alkyl, SiMe3, SiPh3, or C6-C 18 - Substituted with aryl;

[1740] N(C6-C 18 -Aril)2,

[1741] ( C3-C 17 -heteroaryl)2; and

[1742] ( C3-C 17 -heteroaryl)(C6-C 18 -Aril);

[1743] It is selected from a group consisting of.

[1744] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1745] R DABNA-6 In each case, independently of each other are hydrogen, deuterium, N(Ph)2, OPh (Ph = phenyl), SPh, CF3, CN, F, Si(Me)3, Si(Ph)3,

[1746] C1-C5-alkyl,

[1747] Here, optionally, one or more hydrogen atoms are independently substituted with deuterium, Ph, CN, CF3, or F;

[1748] C6-C 18 -Aril,

[1749] Here, optionally, one or more hydrogen atoms are independently deuterium, CN, CF3, F, Me, i Pr, t Substituted with Bu, SiMe3, SiPh3, or Ph;

[1750] C3-C 17 -Heteroaryl,

[1751] Here, optionally, one or more hydrogen atoms are independently deuterium, CN, CF3, F, Me, i Pr, t Substituted with Bu, SiMe3, SiPh3, or Ph;

[1752] It is selected from a group consisting of.

[1753] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1754] R DABNA-6 In each case, hydrogen, deuterium, N(Ph)2, CN, F, Me, independently of each other i Pr, t Bu,

[1755] Ph,

[1756] Here, optionally, one or more hydrogen atoms are independently deuterium, CN, Me, i Pr, t Substituted with Bu or Ph;

[1757] C3-C 17 -Heteroaryl,

[1758] Here, optionally one or more hydrogen atoms are deuterium, CN, Me,i Pr, t Independently substituted by Bu or Ph;

[1759] It is selected from a group consisting of.

[1760] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1761] R DABNA-6 In each case, hydrogen, deuterium, Me, independently of each other i Pr, t Bu,

[1762] Ph,

[1763] Here, optionally one or more hydrogen atoms are deuterium, Me, i Pr, t Independently substituted by Bu or Ph;

[1764] It is selected from a group consisting of.

[1765] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B includes or is composed of a structure according to the chemical formula DABNA-I, and

[1766] Y a and / or Y b Ga NR DABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2 or BR DABNA-3 In the case of, one or two substituents R DABNA-3 is one or two adjacent rings A' and B'(Y a = NR DABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2 or BR DABNA-3in the case of) or A' and C'(Y b = NR DABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2, or BR DABNA-3 It does not combine with ).

[1767] In one embodiment, a small FWHM emitter S in the context of the present invention B ... may optionally also be a polymer (e.g., a dimer) of the aforementioned formula DABNA-I, which means that their structure comprises one or more subunits, each having a structure according to the formula DABNA-I. In this case, a person skilled in the art will understand that two or more subunits according to the formula DABNA-I may be joined, for example, and preferably fused together (i.e., share at least one bond, wherein each substituent attached to the atoms forming the bond may no longer exist). Two or more subunits may also share at least one, preferably exactly one, aromatic or heteroaromatic ring. This is, for example, a small FWHM emitter S B may each comprise two or more subunits having the structure of the chemical formula DABNA-I, wherein these two subunits share one aromatic or heteroaromatic ring (i.e., each ring is part of the two subunits). As a result, the emitter S of each polymer (e.g., of a dimer) BIt may not contain two whole subunits according to the formula DABNA-I, as there is only one shared ring. Nevertheless, a person skilled in the art will understand that such an emitter is still considered herein to be a multimer of the formula DABNA-I (e.g., a dimer if it contains two subunits having the structure of the formula DABNA-I). The same applies to a multimer sharing more than one ring. It is preferable that the multimer be a dimer containing two subunits having the structure of the formula DABNA-I.

[1768] In one embodiment of the present invention, in at least one, preferably each light-emitting layer B, at least one, preferably each small FWHM emitter S B As previously mentioned, it is a dimer of the chemical formula DABNA-I, which means that the emitter contains two subunits each having a structure according to the chemical formula DABNA-I.

[1769] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B It comprises or is composed of two or more, preferably exactly two, structures (i.e., subunits) according to the formula DABNA-I, and

[1770] Here, these subunits share at least one, preferably exactly one, aromatic or heteroaromatic ring (i.e., this ring may be part of two structures of formula DABNA-I), where the shared ring(s) may be any one of rings A', B', and C' of formula DABNA-I, but R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 , especially R DABNA-3Any aromatic or heteroaromatic substituent selected from, or any aromatic or heteroaromatic ring formed by two or more adjacent substituents as described above, wherein the covalent ring may constitute the same or different moiety of two or more structures of formula DABNA-I sharing said ring (i.e., the covalent ring may be, for example, ring C' of both structures of formula DABNA-I optionally included in the emitter, or the covalent ring may be, for example, ring B' of one structure of formula DABNA-I and ring C' of the other structure optionally included in the emitter).

[1771] In one embodiment of the present invention, in at least one, preferably each, light-emitting layer B, at least one, preferably each, one or more small FWHM emitters S B It comprises or is composed of two or more, preferably exactly two, structures (i.e., subunits) according to the formula DABNA-I, and

[1772] Here, R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 At least one of them is replaced by a bond to an additional chemical entity of the formula DABNA-I, and / or is replaced, R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 At least one hydrogen atom of any one of them is replaced by a bond to an additional chemical entity of the chemical formula DABNA-I.

[1773] Small FWHM emitter S according to the present invention B Non-limiting examples of emitters comprising or composed of a structure according to the chemical formula DABNA-I that can be used as are listed below.

[1774]

[1775]

[1776]

[1777]

[1778]

[1779]

[1780]

[1781]

[1782]

[1783]

[1784]

[1785]

[1786]

[1787]

[1788]

[1789]

[1790]

[1791]

[1792]

[1793]

[1794]

[1795]

[1796]

[1797]

[1798]

[1799]

[1800]

[1801]

[1802] Small FWHM emitter S in the context of the present invention B A group of emitters that can be used is an emitter comprising or composed of a structure according to the following chemical formula BNE-1 or a multimer thereof:

[1803]

[1804] Chemical formula BNE-1,

[1805] Here,

[1806] c and d are both integers, selected independently from 0 and 1;

[1807] e and f are both integers, chosen from 0 and 1, where e and f are (always) the same (i.e., both are 0 or both are 1).

[1808] g and h are both integers, selected from 0 and 1, where g and h are (always) the same (i.e., both are 0 or both are 1).

[1809] If d is 0, then e and f are both 1, and if d is 1, then e and f are both 0.

[1810] If c is 0, g and h are both 1, and if c is 1, g and h are both 0.

[1811] V 1 It contains nitrogen (N) and CR BNE-V Selected from;

[1812] V 2 is nitrogen (N) and CR BNE-I Selected from;

[1813] X 3 is direct coupling, CRBNE-3 R BNE-4 ,

[1814] C=CR BNE-3 R BNE-4 , C=O, C=NR BNE-3 , NR BNE-3 , O, SiR BNE-3 R BNE-4 Selected from the group consisting of , S, S(O) and S(O)2;

[1815] Y 2 is direct coupling, CR BNE-3' R BNE-4' ,

[1816] C=CR BNE-3' R BNE-4' , C=O, C=NR BNE-3' , NR BNE-3' , O, SiR BNE-3' R BNE-4' Selected from the group consisting of , S, S(O) and S(O)2;

[1817] R BNE-1 , R BNE-2 , R BNE-1' R BNE-2' , R BNE-3 , R BNE-4 , R BNE-3' , R BNE-4' ,R BNE-I , R BNE-II , R BNE-III , R BNE-IV and R BNE-V Each is independently hydrogen, deuterium, and N(R BNE-5 )2, OR BNE-5 , Si(R BNE-5 )3, B(OR BNE-5 )2, B(R BNE-5 )2, OSO2R BNE-5 , CF3, CN, F, Cl, Br, I,

[1818] C1-C 40 -alkyl,

[1819] This is one or more substituents R BNE-5 Optionally replaced by, and

[1820] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1821] C1-C 40 - Alkoxy,

[1822] This is one or more substituents R BNE-5 Optionally replaced by, and

[1823] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1824] C1-C 40 -Thioalkoxy,

[1825] This is one or more substituents R BNE-5 Optionally replaced by, and

[1826] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONRBNE-5 Replaced with;

[1827] C2-C 40 -Alkenil,

[1828] This is one or more substituents R BNE-5 Optionally replaced by, and

[1829] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1830] C2-C 40 -Alkinil,

[1831] This is one or more substituents R BNE-5 Optionally replaced by, and

[1832] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1833] C6-C 60 -Aril,

[1834] This is one or more substituents R BNE-5 Optionally substituted as; and

[1835] C2-C 57 -Heteroaryl,

[1836] This is one or more substituents RBNE-5 Optionally replaced with;

[1837] Selected from a group composed of;

[1838] R BNE-d , R BNE-d μ and R BNE-e are independently hydrogen, deuterium, and N(R BNE-5 )2, OR BNE-5 , Si(R BNE-5 )3, B(OR BNE-5 )2, B(R BNE-5 )2, OSO2R BNE-5 , CF3, CN, F, Cl, Br, I,

[1839] C1-C 40 -alkyl,

[1840] This is one or more substituents R BNE-a Optionally replaced by, and

[1841] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1842] C1-C 40 - Alkoxy,

[1843] This is one or more substituents R BNE-a Optionally replaced by, and

[1844] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5, P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1845] C1-C 40 -Thioalkoxy,

[1846] This is one or more substituents R BNE-a Optionally replaced by, and

[1847] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1848] C2-C 40 -Alkenil,

[1849] This is one or more substituents R BNE-a Optionally replaced by, and

[1850] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1851] C2-C 40 -Alkinil,

[1852] This is one or more substituents R BNE-a Optionally replaced by, and

[1853] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1854] C6-C 60 -Aril,

[1855] This is one or more substituents R BNE-a Optionally substituted as; and

[1856] C2-C 57 -Heteroaryl,

[1857] This is one or more substituents R BNE-a Optionally replaced with;

[1858] Selected from a group composed of;

[1859] R BNE-a In each case, hydrogen, deuterium, and N(R) are independent of each other. BNE-5 )2, OR BNE-5 , Si(R BNE-5 )3, B(OR BNE-5 )2, B(R BNE-5 )2, OSO2R BNE-5 , CF3, CN, F, Cl, Br, I,

[1860] C1-C 40 -alkyl,

[1861] This is one or more substituents R BNE-5 Optionally replaced by, and

[1862] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(RBNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1863] C1-C 40 - Alkoxy,

[1864] This is one or more substituents R BNE-5 Optionally replaced by, and

[1865] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1866] C1-C 40 -Thioalkoxy,

[1867] This is one or more substituents R BNE-5 Optionally replaced by, and

[1868] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1869] C2-C 40 -Alkenil,

[1870] This is one or more substituents RBNE-5 Optionally replaced by, and

[1871] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1872] C2-C 40 -Alkinil,

[1873] This is one or more substituents R BNE-5 Optionally replaced by, and

[1874] Here, one or more non-adjacent CH2 groups are R BNE-5 C=CR BNE-5 , C≡C, Si(R BNE-5 )2, Ge(R BNE-5 )2, Sn(R BNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced with;

[1875] C6-C 60 -Aril,

[1876] This is one or more substituents R BNE-5 Optionally substituted as; and

[1877] C2-C 57 -Heteroaryl,

[1878] This is one or more substituents R BNE-5 Optionally replaced with;

[1879] Selected from a group composed of;

[1880] R BNE-5In each case, hydrogen, deuterium, and N(R) are independent of each other. BNE-6 )2, OR BNE-6 , Si(R BNE-6 )3, B(OR BNE-6 )2, B(R BNE-6 )2, OSO2R BNE-6 , CF3, CN, F, Cl, Br, I,

[1881] C1-C 40 -alkyl,

[1882] This is one or more substituents R BNE-6 Optionally replaced by, and

[1883] Here, one or more non-adjacent CH2 groups are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced with;

[1884] C1-C 40 - Alkoxy,

[1885] This is one or more substituents R BNE-6 Optionally replaced by, and

[1886] Here, one or more non-adjacent CH2 groups are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced with;

[1887] C1-C 40 -Thioalkoxy,

[1888] This is one or more substituents R BNE-6 Optionally replaced by, and

[1889] Here, one or more non-adjacent CH2 groups are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced with;

[1890] C2-C 40 -Alkenil,

[1891] This is one or more substituents R BNE-6 Optionally replaced by, and

[1892] Here, one or more non-adjacent CH2 groups are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced with;

[1893] C2-C 40 -Alkinil,

[1894] This is one or more substituents R BNE-6 Optionally replaced by, and

[1895] Here, one or more non-adjacent CH2 groups are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NRBNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced with;

[1896] C6-C 60 -Aril,

[1897] This is one or more substituents R BNE-6 Optionally substituted as; and

[1898] C2-C 57 -Heteroaryl,

[1899] This is one or more substituents R BNE-6 Optionally replaced with;

[1900] Selected from a group composed of;

[1901] R BNE-6 In each case, independently of each other, hydrogen, deuterium, OPh, CF3, CN, F,

[1902] C1-C5-alkyl,

[1903] Here, one or more hydrogen atoms are optionally and independently substituted with deuterium, CN, CF3, Ph, or F;

[1904] C1-C5-alkoxy,

[1905] Here, one or more hydrogen atoms are optionally and independently substituted with deuterium, CN, CF3, or F;

[1906] C1-C5-thioalkoxy,

[1907] Here, one or more hydrogen atoms are optionally and independently substituted with deuterium, CN, CF3, or F;

[1908] C2-C5-alkenyl,

[1909] Here, one or more hydrogen atoms are optionally and independently substituted with deuterium, CN, CF3, or F;

[1910] C2-C5-alkynyl,

[1911] Here, one or more hydrogen atoms are optionally and independently substituted with deuterium, CN, CF3, or F;

[1912] C6-C 18 -Aril,

[1913] This is optionally substituted with one or more C1-C5-alkyl substituents;

[1914] C2-C 17 -Heteroaryl,

[1915] This is optionally substituted with one or more C1-C5-alkyl substituents;

[1916] N(C6-C 18 -Aril)2;

[1917] N(C2-C 17 -heteroaryl)2, and

[1918] N(C2-C 17 -heteroaryl)(C6-C 18 -Aril);

[1919] Selected from a group composed of;

[1920] Here, R BNE-III and R BNE-e ... optionally combines to form a direct single bond; and

[1921] Here, substituent R BNE-a , R BNE-d , R BNE-d' , R BNE-e , R BNE-3' , R BNE-4' , R BNE-5 Two or more of them optionally form a monocyclic or polycyclic, aliphatic or aromatic, carbocyclic or heterocyclic and / or cenzo-fused ring system with each other;

[1922] Here, substituent R BNE-1 , R BNE-2 , R BNE-1' , R BNE-2' , R BNE-3 , R BNE-4 , R BNE-5 , R BNE-I , RBNE-II , R BNE-III , R BNE-IV , R BNE-V Two or more of them optionally form a monocyclic or polycyclic, aliphatic or aromatic, carbocyclic or heterocyclic and / or benzo-fused ring system with each other;

[1923] Herein, optionally, two or more, preferably two structures of formula BNE-1 are joined together, preferably fused together by sharing at least one, more preferably exactly one bond;

[1924] Herein optionally, two or more, preferably two, structures of formula BNE-1 are present in the emitter and share at least one, preferably exactly one, aromatic or heteroaromatic ring (i.e., this ring may be part of two structures of formula BNE-1), which is preferably any one of rings a, b, and c' of formula BNE-1, but also R BNE-1 , R BNE-2 , R BNE-1' , R BNE-2' , R BNE-3 , R BNE-4 , R BNE-3' , R BNE-4' , R BNE-5 , R BNE-6 , R BNE-I , R BNE-II , R BNE-III , R BNE-IV , R BNE-V , R BNE-a , R BNE-e , R BNE-d and R BNE-d'Any aromatic or heteroaromatic substituent selected from, or any aromatic or heteroaromatic ring formed by two or more substituents as described above, wherein the covalent ring may constitute the same or different moiety of two or more structures of Formula BNE-1 sharing said ring (i.e., the covalent...

Claims

Claim 1 An organic electroluminescent device comprising at least one light-emitting layer B composed of one or more sublayers, wherein the one or more sublayers are adjacent to each other and the whole comprises: (i) at least one host material H B ;(ii) Energy E λmax (P B Maximum luminescence λ having ) max (P B At least one phosphorescent material P having ) B ; and (iii) energy E λmax (S B Maximum luminescence λ having ) max (S B At least one small full width at half maximum (FWHM) emitter S having ) and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less B ; (iv) Energy E λmax (E B Maximum luminescence λ having ) max (E B At least one thermally activated delayed fluorescence (TADF) material E having ) B ; The above energy E λmax (P B ) is the above phosphorescent material P B The wavelength (λ) that exhibits maximum luminescence max (P B Represents the light energy in )), and the said energy E λmax (S B ) is the above small half-width emitter S B The wavelength (λ) that exhibits maximum luminescence max (S B Represents the light energy in )), and the said energy E λmax (E B ) is the above-mentioned thermally activated delayed fluorescent material E B The wavelength (λ) that exhibits maximum luminescence max (E B Represents light energy in )), where, the one or more sublayers located on the outer surface of the light-emitting layer B are phosphorescent material P B , small FWHM emitter S B , and TADF material E B It comprises at least one emitter material selected from the group consisting of, and at least one sublayer is exactly one TADF material E B and exactly one of the above phosphorescent materials P B Includes all of the, and the relationship indicated by the following equations (16) and (17) applies: | E λmax (P B ) - E λmax (S B )| < 0.30 eV (16),| E λmax (E B ) - E λmax (S B )| < 0.30 eV (17). Claim 2 In claim 1, an organic electroluminescent device to which the relationship indicated by the following formulas (18) and (19) is applied: | E λmax (P B ) - E λmax (S B )| < 0.20 eV (18),| E λmax (E B ) - E λmax (S B )| < 0.20 eV (19). Claim 3 delete Claim 4 In claim 1, an organic electroluminescent device to which the relationship indicated by the following formula (22) is applied: E λmax (P B ) > E λmax (S B ) (22). Claim 5 In claim 1, an organic electroluminescent device to which the relationship represented by the following formula (22-a) is applied: E λmax (E B ) > E λmax (S B ) (22-a). Claim 6 In claim 1, an organic electroluminescent device to which at least one of the relationships indicated by the following formulas (23) to (25) is applied: 440 nm < λ max (S B ) < 470 nm (23)510 nm < λ max (S B ) < 550 nm (24)610 nm < λ max (S B ) < 665 nm (25) Claim 7 In claim 1, each TADF material E B (i) lowest excited singlet state energy E(S1 E ) and lowest excited triplet state energy E(T1 E ΔE corresponding to the energy difference between ) ST An organic electroluminescent device characterized by having a value of less than 0.4 eV; and (ii) having a photoluminescent quantum yield (PLQY) greater than 30%. Claim 8 In paragraph 1, (i) each host material H B is energy E HOMO (H B HOMO(H) with the highest occupied molecular orbital B (ii) each phosphorescent material P having ) B energy E HOMO (P B HOMO(P) with the highest occupied molecular orbital B ) having; (iii) each small full width at half maximum (FWHM) emitter S B is energy E HOMO (S B HOMO(S) with the highest occupied molecular orbital B ) having; here, the relationship expressed by the following equations (10) and (11) applies.E HOMO (P B ) > E HOMO (H B ) (10)E HOMO (P B ) > E HOMO (S B ) (11). Claim 9 In paragraph 1, (i) each host material H B is energy E LUMO (H B Lowest unoccupied molecular orbital LUMO(H) having ) B (ii) each thermally activated delayed fluorescence (TADF) material E having ) B is energy E LUMO (E B Lowest unoccupied molecular orbital LUMO(E) having ) B (iii) each phosphorescent material P B energy E LUMO (P B Lowest unoccupied molecular orbital LUMO(P) having ) B ) having; (iv) each small full width at half maximum (FWHM) emitter S B is energy E LUMO (S B Lowest unoccupied molecular orbital LUMO(S) having ) B ) having; here, the relationship expressed by the following equations (12) and (13) applies.E LUMO (E B ) < E LUMO (H B ) (12)E LUMO (E B ) < E LUMO (P B ) (13). Claim 10 The organic electroluminescent device of claim 1, wherein the one or more sublayers as a whole comprise or are composed of the following: (i) 30-99.8 wt% of one or more host materials H B ; (ii) 0.1-30 wt% of one or more phosphorescent materials P B ; and (iii) 0.1-10 wt% of one or more small FWHM emitters S B ; and optionally (iv) 0-69.8 wt% of one or more TADF materials E B ; and optionally (v) 0-69.8 wt% of one or more solvents. Claim 11 In claim 1, each light-emitting layer B of the organic electroluminescent device comprises exactly one, exactly two, or exactly three sublayers. Claim 12 An organic electroluminescent device according to claim 1, consisting of exactly one layer. Claim 13 In claim 1, each small FWHM emitter S included in the organic electroluminescent device B is 5.0 Å 2 An organic electroluminescent device having the following shielding parameters. Claim 14 A method for generating light comprising the following steps: (i) providing an organic electroluminescent element according to any one of claims 1, 2 and 4 to 13; and (ii) applying current to the organic electroluminescent element. Claim 15 In paragraph 14, a light generating method of a wavelength range selected from one of the following wavelength ranges: (i) 510 nm to 550 nm, or (ii) 440 nm to 470 nm, or (iii) 610 nm to 665 nm.

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