Organic electroluminescent element

Abstract

The present invention relates to an organic electroluminescent device comprising at least one light-emitting layer B consisting of one or more sublayers, the one or more sublayers of the light-emitting layer B being entirely composed of 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 where S B The emits light having a full width at half maximum (FWHM) of 0.25 eV or less.

Description

[Technical Field]

[0001] The present invention relates to an organic electroluminescent element comprising one or more light-emitting layers B, each consisting of one or more sublayers, wherein the one or more sublayers of each light-emitting layer B are collectively made of at least one host material H B , at least one phosphorescent material P B , at least one small FWHM emitter S B , and selectively at least one TADF material E B This includes, where at least one, preferably, each S B This device emits light having a full width at half maximum (FWHM) of 0.25 eV or less. Furthermore, the present invention relates to a light generation method utilizing an organic electroluminescent element according to the present invention. [Overview of the Initiative] [Problems that the invention aims to solve]

[0002] For example, organic electroluminescent devices, which include one or more light-emitting layers based on organic materials, such as organic light-emitting diodes (OLEDs), light-emitting electrochemical cells (LECs), and light-emitting transistors, are becoming increasingly important. OLEDs, in particular, are promising devices for electronic products such as screens, displays, and lighting devices. In contrast to most electroluminescent devices, which are substantially based on inorganic materials, organic electroluminescent devices, which are based on organic materials, are often flexible and can be produced, especially in thin films. Currently available OLED-based screens and displays offer excellent efficiency and long lifespan, or excellent color purity and long lifespan, but they do not possess all three characteristics.

[0003] While the color purity or color point of an OLED is generally provided by CIEx and CIEy coordinates, the color gamut of next-generation displays is provided by so-called BT-2020 and DCPI3 values. Generally, obtaining such color coordinates requires the top-emission element to modify its cavity and adjust the color coordinates. To achieve high efficiency in the top-emission element while targeting such a color gamut, a narrow emission spectrum is required in the bottom-emission element.

[0004] The latest phosphorescent emitters exhibit fairly broad emission, which is reflected in the broad emission of phosphorescent-based OLEDs (PHOLEDs), which generally have an emission spectrum with a full width at half maximum (FWHM) greater than 0.25 eV. The broad emission spectrum of the PHOLED in the lower element results in high outcoupling efficiency losses for top-emission element structures targeting the BT-2020 and DCPI three-color regions.

[0005] Furthermore, phosphorescent materials are generally based on transition metals, such as iridium, which are generally scarce and therefore very expensive materials in OLED stacks. Consequently, transition metal-based materials offer the greatest potential for cost reduction in OLEDs. Reducing the transition metal content in OLED stacks is a key performance indicator for pricing OLED-applied products.

[0006] In recent years, some fluorescent emitters or TADF (thermally-activated-delayed-fluorescence) emitters exhibiting fairly narrow emission spectra have been developed. These generally exhibit FWHM with emission spectra below 0.25 eV and are therefore suitable for achieving the BT-2020 and DCPI three-color regions. However, such fluorescent and TADF emitters generally experience not only short lifetimes due to exciton-polaron annihilation or exciton-exciton annihilation, but also low efficiency due to reduced efficiency at higher brightness levels (i.e., OLED roll-off behavior).

[0007] Such drawbacks can be overcome to some extent by applying a so-called hyper-approach. The latter, as mentioned above, preferably relies on the use of an energy pump that transfers energy to a fluorescent emitter exhibiting a narrow emission spectrum. The energy pump can be, for example, a TADF material exhibiting reverse intersystem crossing (RISC) or a transition metal complex exhibiting efficient intersystem crossing (ISC). However, such an approach still fails to provide an organic electroluminescent device that possesses all of the aforementioned desirable characteristics: excellent efficiency, long lifetime, and excellent color purity.

[0008] The main component of an organic electroluminescent element for generating light is typically at least one light-emitting layer located between the positive and negative electrodes. When a voltage (and current) is applied to the organic electroluminescent element, holes are injected from the positive electrode and electrons are injected from the negative electrode.

[0009] Typically, the hole transport layer is located (generally) between the light-emitting layer and the positive electrode, and the electron transport layer is typically located between the light-emitting layer and the negative electrode. Different layers are arranged sequentially. High-energy excitons are generated in the light-emitting layer by the recombination of holes and electrons. The decay of such excited states (e.g., singlet states such as S1 and / or triplet states such as T1) to a bottom state (S0) preferably causes luminescence. [Means for solving the problem]

[0010] Surprisingly, we have found that an organic electroluminescent element whose light-emitting layer consists of one or more layers comprising a phosphorescent material, a small full-width at half maximum (FWHM) emitter, a host material, and selectively a TADF material, provides an organic electroluminescent element that exhibits narrow emission, has a long lifetime, high quantum yield, and is ideally suited for achieving the BT-2020 and DCPI three-color regions.

[0011] Here, the phosphorescent material and / or the selective TADF material can transfer energy to a small full-width at half-maximum (FWHM) emitter that exhibits luminescence.

Embodiments for Carrying Out the Invention

[0012] The present invention relates to an organic electroluminescence device including at least one light-emitting layer B composed of one or more sub-layers, and the one or more sub-layers are adjacent to each other and collectively include the following: (i) At least one host material H having a lowest excited singlet state energy level E(S1 H ) and a lowest excited triplet state energy level E(T1 H ) B , (ii) At least one phosphorescent material P having a lowest excited singlet state energy level E(S1 P ) and a lowest excited triplet state energy level E(T1 P ) B , (iii) At least one small full-width at half-maximum (FWHM) emitter S having a lowest excited singlet state energy level E(S1 S ) and a lowest excited triplet state energy level E(T1 S ) and emitting light having a full-width at half-maximum (FWHM) of not more than 0.25 eV B , and optionally <x (iv) At least one thermally activated delayed fluorescence (TADF) material E having a lowest excited singlet state energy level E(S1 <00OO015>) and a lowest excited triplet state energy level E(T1 E ) <$ B , Here, one or more sub-layers positioned on the outer surface of the light-emitting layer B include at least one (emitter) material selected from the group consisting of the phosphorescent material P B , the small FWHM emitter S B and the TADF material E. B

[0013] One aspect of the present invention relates to an organic electroluminescent element comprising at least one light-emitting layer B including one or more sublayers, wherein the one or more sublayers are adjacent to each other and Physically includes the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) Host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) Phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1 S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has a ) and emits light with a FWHM of 0.25 eV or less. B , and selectively (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) has a thermally activated delayed fluorescence (TADF) material E B , 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 includes at least one (emitter) material selected from the group consisting of the following.

[0014] In one embodiment of the present invention, at least one of the one or more sublayers of the at least one light-emitting layer B includes the following: (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) at least one thermally activated delayed fluorescence (TADF) material E B .

[0015] In one embodiment of the present invention, the organic electroluminescent element includes at least one light-emitting layer B consisting of one or more sublayers, wherein the one or more sublayers of the light-emitting layer B include the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) at least one host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) at least one phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1 S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has ) and emits light having a FWHM of 0.25 eV or less B , and selectively (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) at least one thermally activated delayed fluorescence (TADF) material E B .

[0016] In one embodiment of the present invention, the organic electroluminescent element includes at least one light-emitting layer B consisting of one or more sublayers, wherein the one or more sublayers of the light-emitting layer B include the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) Host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) Phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1 S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has a ) and emits light with a FWHM of 0.25 eV or less. B , and (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) has a thermally activated delayed fluorescence (TADF) material E B .

[0017] In one embodiment of the present invention, the organic electroluminescent element includes at least one light-emitting layer B consisting of one or more sublayers, wherein the one or more sublayers of the light-emitting layer B include the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) at least one host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) at least one phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1 S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has ) and emits light having a FWHM of 0.25 eV or less B , and (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) at least one thermally activated delayed fluorescence (TADF) material E B .

[0018] In one embodiment of the present invention, the organic electroluminescence device includes at least one light-emitting layer B including the following: (i) At least one host material H having a lowest excited singlet state energy level E(S1 H ) and a lowest excited triplet state energy level E(T1 H ), B , (ii) At least one phosphorescent material P having a lowest excited singlet state energy level E(S1 P ) and a lowest excited triplet state energy level E(T1 P ), B , (iii) At least one small full width at half maximum (FWHM) emitter S having a lowest excited singlet state energy level E(S1 S ) and a lowest excited triplet state energy level E(T1 S ) and emitting light having a FWHM of 0.25 eV or less, and B , and (iv) At least one thermally activated delayed fluorescence (TADF) material E having a lowest excited singlet state energy level E(S1 E ) and a lowest excited triplet state energy level E(T1 E ). B .

[0019] In one embodiment of the present invention, the organic electroluminescence device includes exactly one light-emitting layer B including the following: (i) Host material H B , (ii) Phosphorescent material P B , (iii) Small FWHM emitter S B , and optionally (iv) TADF material E B .

[0020] In a preferred embodiment, the organic electroluminescence device includes exactly one light-emitting layer B including the following: (i) At least one host material H B , (ii) at least one phosphorescent material P B , (iii) at least one small FWHM emitter S B , and (iv) At least one thermally activated delayed fluorescence (TADF) material E B .

[0021] Combination of sub-layers In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of exactly one (sub) layer. In a preferred embodiment of the present invention, each light-emitting layer B included in the electroluminescent element according to the present invention consists of exactly one (sub) layer. In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes exactly one light-emitting layer B consisting of exactly one (sub) layer.

[0022] In another embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers. In another embodiment of the present invention, each light-emitting layer B included in the electroluminescent element according to the present invention includes one or more sublayers. In another embodiment of the present invention, the electroluminescent element according to the present invention Each light-emitting layer B contained within consists of one or more sublayers.

[0023] In another embodiment of the present invention, the electroluminescent element according to the present invention includes exactly one light-emitting layer B consisting of one or more sublayers. In another embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of exactly two sublayers.

[0024] In another embodiment of the present invention, each light-emitting layer B included in the electroluminescent element according to the present invention consists of exactly two sublayers. In another embodiment of the present invention, the electroluminescent element according to the present invention includes exactly one light-emitting layer B consisting of exactly two sublayers.

[0025] In another embodiment of the present invention, the electroluminescence device according to the present invention includes at least one light-emitting layer B composed of two or more sub-layers. In another embodiment of the present invention, each light-emitting layer B included in the electroluminescence device according to the present invention is composed of two or more sub-layers.

[0026] In another embodiment of the present invention, the electroluminescence device according to the present invention includes exactly one light-emitting layer B composed of two or more sub-layers.

[0027] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescence device according to the present invention includes exactly one, exactly two or exactly three sub-layers.

[0028] It is understood that different sub-layers of the light-emitting layer B do not necessarily all contain the same material, and more preferably do not contain the same material in the same proportion.

[0029] Different sub-layers of the light-emitting layer B are understood to be adjacent to each other.

[0030] In one embodiment of the present invention, at least one sub-layer includes exactly one TADF material E B and exactly one phosphorescent material P B and contains.

[0031] In one embodiment of the present invention, the electroluminescence device according to the present invention includes at least one light-emitting layer B composed of one or more sub-layers, where at least one sub-layer is a TADF material E B , a phosphorescent material P B or a small FWHM emitter S B does not contain.

[0032] In one embodiment of the present invention, the electroluminescence device according to the present invention includes at least one light-emitting layer B composed of one or more sub-layers, where at least one sub-layer includes at least one host material H B, exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes.

[0033] In one embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is 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.

[0034] In one embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely 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.

[0035] In one embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B , exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes.

[0036] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B Includes.

[0037] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, where the one or more sublayers are exactly one TADF material E B Includes.

[0038] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is exactly one phosphorescent material P B Includes.

[0039] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is exactly one small FWHM emitter S B Includes.

[0040] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B and exactly one TADF material E B Includes.

[0041] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B and exactly one phosphorescent material P B Includes.

[0042] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B and exactly one small FWHM emitter S B Includes.

[0043] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is exactly one TADF material E B and exactly one small FWHM emitter S B Includes.

[0044] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is exactly one TADF material E B and exactly one phosphorescent material P B Includes.

[0045] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes.

[0046] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B , exactly one TADF material E B and exactly one small FWHM emitter S B Includes.

[0047] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B , exactly one TADF material E B and exactly one phosphorescent material P B Includes.

[0048] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely one host material H B , exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes.

[0049] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the 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.

[0050] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, wherein the at least one sublayer is precisely 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.

[0051] In a preferred embodiment of the present invention, one sublayer is exactly one TADF material E B It includes one sublayer (preferably another sublayer) which is exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes.

[0052] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B comprising (or composed of) three or more sublayers, wherein the first sublayer B1 is exactly one TADF material E B The second sublayer B2 is exactly one phosphorescent material P BThe third sublayer B3 contains exactly one small FWHM emitter S B Includes.

[0053] The sublayers of the light-emitting layer B can also be fabricated in other sequences, such as B1-B2-B3, B1-B3-B2, B2-B1-B3, B2-B3-B1, B3-B2-B1, and B3-B1-B2, and may have one or more other sublayers in between.

[0054] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B comprising (or composed of) two or more sublayers, wherein the first sublayer B1 is exactly one TADF material E B and exactly one phosphorescent material P B The second sublayer B2 contains exactly one small FWHM emitter S B Includes.

[0055] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B comprising (or composed of) two or more sublayers, wherein the first sublayer B1 is exactly one TADF material E B The second sublayer B2 is exactly one phosphorescent material P B and exactly one small FWHM emitter S B Includes.

[0056] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B comprising (or composed of) two or more sublayers, wherein the first sublayer B1 is exactly one phosphorescent material P B Including the second sublayer B2, the second sublayer is exactly one TADF material E B and exactly one small FWHM emitter S B Includes.

[0057] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B comprising (or composed of) two or more sublayers, wherein the first sublayer B1 comprises exactly one small FWHM emitter S B Including the second sublayer B2, the second sublayer is exactly one TADF material E B and exactly one phosphorescent material P B This includes. In a preferred embodiment, sublayers B1 and B2 are (directly) adjacent to each other, i.e., in (direct) contact with each other.

[0058] Furthermore, the organic electroluminescent element according to the present invention may selectively 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, the organic electroluminescent element according to the present invention includes at least one light-emitting layer B as defined in this application, and may selectively include one or more further light-emitting layers to which the requirements given in this application do not necessarily apply. In other embodiments of the present invention, at least one, if not all, light-emitting layer included in the organic electroluminescent element according to the present invention is a light-emitting layer B as defined in a particular embodiment of the present invention.

[0059] In a preferred embodiment of the present invention, each light-emitting layer included in the organic electroluminescent element according to the present invention is a light-emitting layer B as defined in a particular embodiment of the present invention.

[0060] Composition of the light-emitting layer (EML) B (At least one) host material H B , (at least one) phosphorescent material P B and (at least one) small FWHM emitter S B It is included in organic electroluminescent elements in any amount and any proportion.

[0061] 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 is included in organic electroluminescent elements in any amount and any proportion.

[0062] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, where each of the at least one sublayers is (at least one) host material H B (More specifically, H P and / or H N and / or H BP ) to (at least one) small FWHM emitter S B Contains more.

[0063] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, where each of the at least one sublayers is (at least one) host material H B (More specifically, H P and / or H N and / or H BP ) to (at least one) phosphorescent material P B Contains more.

[0064] In a preferred embodiment of the present invention, the electroluminescent element according to the present invention includes at least one light-emitting layer B consisting of one or more sublayers, where each of the at least one sublayers is (at least one) host material H B (More specifically, H P and / or H N and / or H BP ) to (at least one) TADF material E B Contains more.

[0065] In a preferred embodiment of the present invention, each of the at least one light-emitting layers B of the organic electroluminescent element according to the present invention is at least one TADF material EB at least one small FWHM emitter S B Contains more.

[0066] In a preferred embodiment, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight of one or more host materials H B , (ii) 0.1 to 30% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , and selectively (v) 1 or more solvents in an amount of 0 to 69.8% by weight.

[0067] In a preferred embodiment, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight, preferably 60-99.8% by weight, of one or more host materials H B , (ii) 0.1 to 50% by weight, preferably 0.1 to 30% by weight, of one or more phosphorescent materials P B , (iii) 0.1 to 20% by weight, preferably 0.1 to 10% by weight, one or more small FWHM emitters S B , and selectively (v) 0-3% by weight of 1 or more solvents

[0068] In a preferred embodiment, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight of one or more host materials H B , (ii) 0.1 to 20% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , and selectively (v) 1 or more solvents in an amount of 0 to 69.8% by weight.

[0069] In a preferred embodiment, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight, preferably 70-99.8% by weight, of one or more host materials H B , (ii) 0.1 to 20% by weight of 1 or more phosphorescent material P B , (iii) 0.1 to 50% by weight, preferably 0.1 to 10% by weight, one or more small FWHM emitters S B , and selectively (v) 0-3% by weight of 1 or more solvents

[0070] E B In a preferred embodiment in which this is selective, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight of one or more host materials H B , (ii) 0.1 to 30% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , and selectively (iv) 1 or more TADF material E in an amount of 0-69.8% by weight B , and selectively (v) 1 or more solvents in an amount of 0 to 69.8% by weight.

[0071] E BIn a preferred embodiment in which this is selective, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight of one or more host materials H B , (ii) 0.1 to 30% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , and selectively (iv) 1 or more TADF material E in an amount of 0-69.8% by weight B , and selectively (v) 0-3% by weight of 1 or more solvents

[0072] E B In a preferred embodiment in which this is selective, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight of one or more host materials H B , (ii) 0.1 to 20% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , and selectively (iv) 1 or more TADF material E in an amount of 0-69.8% by weight B , and selectively (v) 1 or more solvents in an amount of 0 to 69.8% by weight.

[0073] E B In a preferred embodiment in which this is selective, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-99.8% by weight of one or more host materials HB , (ii) 0.1 to 20% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , and selectively (iv) 1 or more TADF material E in an amount of 0-69.8% by weight B , and selectively (v) 0-3% by weight of 1 or more solvents

[0074] E B In a more selective and preferred embodiment, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-87.8% by weight of one or more host materials H B , (ii) 0.1 to 30% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 1 or more TADF material E at 12-40% by weight B , and selectively (v) 0 to 57.8% by weight of 1 or more solvents.

[0075] E B In a more selective and preferred embodiment, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-87.8% by weight of one or more host materials H B , (ii) 0.1 to 30% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 1 or more TADF material E at 12-40% by weightB , and selectively (v) 0-3% by weight of 1 or more solvents

[0076] E B In a more selective and preferred embodiment, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-87.8% by weight of one or more host materials H B , (ii) 0.1 to 20% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 1 or more TADF material E at 12-40% by weight B , and selectively (v) 0 to 57.8% by weight of 1 or more solvents.

[0077] E B In a preferred embodiment in which this is selective, in the organic electroluminescent element according to the present invention, at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) comprises (or is composed of) the following as a whole: (i) 30-87.8% by weight of one or more host materials H B , (ii) 0.1 to 20% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 1 or more TADF material E at 12-40% by weight B , and selectively (v) 0-3% by weight of 1 or more solvents

[0078] 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% by weight or less. B Includes.

[0079] In one embodiment of the present invention, the organic electroluminescent element includes at least one light-emitting layer B comprising the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) at least one host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) at least one phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1 S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has ) and emits light having a FWHM of 0.25 eV or less B , and (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) at least one thermally activated delayed fluorescence (TADF) material E B , Here, the relationships expressed by equations (1) and (2) below apply, E(T1 H )>E(T1 P ) (1) E(T1 P )>E(S1 S ) (2) Here, (at least one), preferably, each light-emitting layer B contains 5% by weight or less of one or more phosphorescent material P B Includes.

[0080] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-96.8% by weight of one or more host materials H B(Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 3-69.8% by weight of 1 or more TADF material E B , and selectively (v) 1 or more solvents in an amount of 0 to 66.8% by weight.

[0081] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-96.8% by weight of one or more host materials H B (Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 3-69.8% by weight of 1 or more TADF material E B , and selectively (v) 0-3% by weight of 1 or more solvents

[0082] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-89.8% by weight of one or more host materials H B (Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 10-40% by weight of 1 or more TADF material E B , and selectively (v) 0 to 59.8% by weight of 1 or more solvents.

[0083] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-89.8% by weight of one or more host materials H B (Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , (iv) 1 or more TADF material E at 10-52% by weight B , and selectively (v) 0-3% by weight of 1 or more solvents

[0084] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-96.8% by weight of one or more host materials H B (Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1-5% by weight, 1 or more B , (iv) 3-69.8% by weight of 1 or more TADF material E B , and selectively (v) 1 or more solvents in an amount of 0 to 66.8% by weight.

[0085] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-96.8% by weight of one or more host materials H B (Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1-5% by weight, 1 or more B , (iv) 3-69.8% by weight of 1 or more TADF material E B , and selectively (v) 0-3% by weight of 1 or more solvents

[0086] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-87.8% by weight of one or more host materials H B (Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1-5% by weight, 1 or more B , (iv) 1 or more TADF material E at 12-40% by weight B , and selectively (v) 0 to 57.8% by weight of 1 or more solvents.

[0087] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B includes or is composed of the following: (i) 30-87.8% by weight of one or more host materials H B (Also, host compound H B (Also known as), (ii) 0.1 to 5% by weight of 1 or more phosphorescent material P B , (iii) Small FWHM emitters S of 0.1-5% by weight, 1 or more B , (iv) 1 or more TADF material E at 12-57% by weight B , and selectively (v) 0-3% by weight of 1 or more solvents

[0088] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises 3% by weight or less of phosphorescent material P B Includes.

[0089] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, comprises 1% by weight or less of phosphorescent material P B Includes.

[0090] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, is made of 10 to 40% by weight of one or more TADF materials E B Includes.

[0091] In one embodiment of the present invention, a small half-width (FWHM) emitter S (at least one) B (At least one) phosphorescent material P B The mass ratio (S B :P B ) is ≥ 1.

[0092] In one embodiment of the present invention, in at least one light-emitting layer B, (at least one) small half-width (FWHM) emitter S B (At least one) phosphorescent material P B The mass ratio (S B :P B ) is ≥ 1. In one embodiment of the present invention, in each light-emitting layer B, (at least one) small half-width (FWHM) emitter S B (At least one) phosphorescent material P B The mass ratio (S B :P B ) is ≥ 1.

[0093] In one embodiment of the present invention, a small half-width (FWHM) emitter S (at least one) B (At least one) phosphorescent material P B The mass ratio (S B :P B ) is <1.

[0094] In one embodiment of the present invention, in at least one light-emitting layer B, (at least one) small half-width (FWHM) emitter S B (At least one) phosphorescent material PB The mass ratio (S B :P B ) is < 1. In one embodiment of the present invention, in each light-emitting layer B, (at least one) small half-width (FWHM) emitter S B (At least one) phosphorescent material P B The mass ratio (S B :P B ) is <1.

[0095] In one embodiment of the present invention, the mass ratio S B :P B The ratio S 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, the mass ratio S B :P B The ratios are 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.

[0096] In one embodiment of the present invention, a small half-width (FWHM) emitter S (at least one) B (At least one) phosphorescent material P B The mass ratio (S B :P B ) is <1.

[0097] In one embodiment of the present invention, the mass ratio P B :S B The ratio P 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 The ratios are 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.

[0098] As mentioned above, the different sublayers of the light-emitting layer B are understood not to be all made of the same material, or more preferably, not to contain the same proportion of the same material.

[0099] S1-T1 energy relationship In one embodiment of the present invention, the relationship represented by the following formulas (1) and (2) applies: E(T1 H )>E(T1 P ) (1) E(T1 P )>E(S1 S ) (2) Therefore, each host material H B The lowest excited triplet state T1 H These are the respective phosphorescent materials P B The lowest excited triplet state T1 P Higher energy, each phosphorescent material P B The lowest excited triplet state T1 P Each of these is a small FWHM emitter S B The lowest excited singlet state S1 S It has higher energy.

[0100] In one embodiment, the aforementioned relationship represented by formulas (1) and (2) applies to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0101] An organic electroluminescent element including at least one light-emitting layer B includes the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) at least one host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) at least one phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has ) and emits light having a FWHM of 0.25 eV or less B , and (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) at least one thermally activated delayed fluorescence (TADF) material E B , Here, the relationship expressed by equations (1) and (2) below applies: E(T1 H )>E(T1 P ) (1) E(T1 P )>E(S1 S ) (2).

[0102] In one embodiment, the aforementioned relationship represented by formulas (1) and (2) applies to a material included in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention.

[0103] In a preferred embodiment of the present invention, the following relationships represented by formulas (3) and (4) apply: E(T1 H )>E(T1 E ) (3) E(T1 E )>E(T1 P ) (4) Therefore, each host material H B The lowest excited triplet state T1 H Each TADF material E B The lowest excited triplet state T1 E Higher energy, each TADF material E B The lowest excited triplet state T1 E These are the respective phosphorescent materials P B The lowest excited triplet state T1 P It has higher energy.

[0104] In one embodiment, the aforementioned relationships represented by formulas (3) and (4) apply to the material contained in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (3) and (4) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0105] In an alternative embodiment of the present invention, the relationships represented by the following formulas (5) and (6) are applied. reru: E(T1 P )>E(T1 E ) (5) E(S1 E )>E(S1 S ) (6) Therefore, each phosphorescent material P B The lowest excited triplet state T1 P Each TADF material E B The lowest excited triplet state T1 E Higher energy, each TADF material E B The lowest excited triplet state S1 E Each of these is a small FWHM emitter S B The lowest excited singlet state S1 S It has higher energy.

[0106] In one embodiment, the aforementioned relationships represented by formulas (5) and (6) apply to the material contained in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (5) and (6) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0107] In a preferred embodiment of the present invention, the following relationships represented by formulas (1) to (4) apply: E(T1 H )>E(T1 P ) (1) E(T1 P )>E(S1 S) (2) E(T1 H )>E(S1 E ) (3) E(T1 E )>E(T1 P ) (4).

[0108] In one embodiment, the aforementioned relationships represented by formulas (1) to (4) apply to the material contained in any one of the at least one light-emitting layer B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (1) to (4) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0109] In one embodiment of the present invention, each phosphorescent material P B The lowest excited triplet state T1 P And each TADF material E B The lowest excited triplet state T1 E The (energy) difference between them is less than 0.3 eV: E(T1) P )-E(T1 E ) < 0.3eV and E(T1 E )-E(T1 P ) < 0.3eV.

[0110] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably each phosphorescent material P is present. B The lowest excited triplet state T1 P And at least one, preferably each TADF material E B The lowest excited triplet state T1 E The energy difference between them is less than 0.3 eV: E(T1 P )-E(T1 E ) < 0.3eV and E(T1 E )-E(T1 P ) < 0.3eV.

[0111] In one embodiment of the present invention, in each of the one or more light-emitting layers B, at least one, preferably each phosphorescent material PB The lowest excited triplet state T1 P And at least one, preferably each TADF material E B The lowest excited triplet state T1 E The energy difference between them is less than 0.3 eV: E(T1 P )-E(T1 E ) < 0.3eV and E(T1 E )-E(T1 P ) < 0.3eV.

[0112] In one embodiment of the present invention, the relationship represented by the following formula (4) applies: E(T1 E )>E(T1 P ) (4).

[0113] In one embodiment, the aforementioned relationship represented by formula (4) applies to a material included in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationship represented by formula (4) applies to the organic electroluminescent element according to the present invention. This applies to the material contained in the same light-emitting layer B of the lectroluminescent element.

[0114] In a preferred embodiment of the present invention, at least one, preferably each, TADF material E B The lowest excited triplet state T1 E And at least one, preferably each phosphorescent material P B The lowest excited triplet state T1 P The energy difference is less than 0.2 eV: E(T1 E )-E(T1 P ) < 0.2eV.

[0115] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B contains at least one, preferably each TADF material E B The lowest excited triplet state T1 E And at least one, preferably each phosphorescent material P B The lowest excited triplet state T1P The energy difference is less than 0.2 eV: E(T1 E )-E(T1 P ) < 0.2eV.

[0116] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, at least one, preferably each TADF material E B The lowest excited triplet state T1 E And at least one, preferably each phosphorescent material P B The lowest excited triplet state T1 P The energy difference is less than 0.2 eV: E(T1 E )-E(T1 P ) < 0.2eV.

[0117] In a preferred embodiment of the present invention, at least one, preferably, each phosphorescent material P B The lowest excited triplet state T1 P and at least one, preferably, small half-width (FWHM) emitter S B The lowest excited triplet state S1 S (Energy level E(S1 S The energy difference between )) and is less than 0.3 eV: E(T1 P )-E(S1 S ) < 0.3eV.

[0118] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B contains at least one, preferably each phosphorescent material P. B The lowest excited triplet state T1 P and at least one, preferably, small half-width (FWHM) emitter S B The lowest excited singlet state S1 S The energy difference between them is less than 0.3 eV: E(T1 P )-E(S1 S ) < 0.3eV.

[0119] In a preferred embodiment of the present invention, each of the one or more light-emitting layers B contains at least one, preferably each phosphorescent material P B The lowest excited triplet state T1 P and at least one, preferably, small half-width (FWHM) emitter S B The lowest excited singlet state S1 S The energy difference between them is less than 0.3 eV: E(T1 P )-E(S1 S ) < 0.3eV.

[0120] In a preferred embodiment of the present invention, each phosphorescent material P B The lowest excited triplet state T1 P And each of the small half-width (FWHM) emitters S B The lowest excited singlet state S1 S (Energy level E(S1 S The energy difference between )) and is less than 0.2 eV: E(T1 P )-E(S1 S ) < 0.2eV.

[0121] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B contains at least one, preferably each phosphorescent material P. B The lowest excited triplet state T1 P and at least one, preferably, small half-width (FWHM) emitter S B The lowest excited singlet state S1 S The energy difference is less than 0.2 eV: E(T1 P )-E(S1 S ) < 0.2eV.

[0122] In a preferred embodiment of the present invention, each of the one or more light-emitting layers B contains at least one, preferably each phosphorescent material P B The lowest excited triplet state T1 P and at least one, preferably, small half-width (FWHM) emitter S B Lowest excitation single Term state S1S The energy difference is less than 0.2 eV: E(T1 P )-E(S1 S ) < 0.2eV.

[0123] HOMO-LUMO energy In a preferred embodiment of the present invention, the following requirements are met: (i) Each host material H B is energy E HOMO (H B ) has the highest occupied orbit HOMO(H B ) has, (ii) Each phosphorescent material P B is energy E HOMO (P B ) has the highest occupied orbit HOMO(P B ) has, (iii) Each small half-width (FWHM) emitter S B is energy E HOMO (S B ) has the highest occupied orbit HOMO(S B ) has, Here, the relationships expressed by equations (10) and (11) below apply: E HOMO (P B )>E HOMO (H B ) (10) E HOMO (P B )>E HOMO (S B ) (11).

[0124] In one embodiment, the aforementioned relationships represented by formulas (10) and (11) apply to the material contained in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (10) and (11) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0125] In one embodiment of the present invention, energy E HOMO (SB Each small FWHM emitter S has ) B The highest occupied orbital HOMO(S B ) is energy E HOMO (H B Each host material H has ) B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (S B )>E HOMO (H B ).

[0126] In one embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B ) is energy E HOMO (H B At least one, preferably each host material H, having ) B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (S B )>E HOMO (H B ).

[0127] 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 half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B ) is energy E HOMO (H B At least one, preferably each host material H, having ) B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (S B )>EHOMO (H B ).

[0128] In one embodiment of the present invention, energy E HOMO (S B Each small FWHM emitter S has ) B The highest occupied orbital HOMO(S B ) is energy E HOMO (E B Each TADF material E has ) B The highest occupied orbit HOMO(E) B ) has even higher energy: E HOMO (S B )>E HOMO (E B ).

[0129] In one embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B ) is energy E HOMO (E B At least one, preferably each TADF material E, having ) B The highest occupied orbit HOMO(E) B ) has even higher energy: E HOMO (S B )>E HOMO (E B ).

[0130] 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 half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B ) is energy E HOMO (E BAt least one, preferably each TADF material E, having ) B The highest occupied orbit HOMO(E) B ) has even higher energy: E HOMO (S B )>E HOMO (E B ).

[0131] 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 orbital HOMO(P B ) is energy E HOMO (E B At least one, preferably each TADF material E, having ) B The highest occupied orbit HOMO(E) B ) has even higher energy: E HOMO (P B )>E HOMO (E B ).

[0132] In one embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (P B At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) is energy E HOMO (E B At least one, preferably each TADF material E, having ) B The highest occupied orbit HOMO(E) B ) has even higher energy: E HOMO (P B )>E HOMO (E B ).

[0133] 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 orbital HOMO(P B ) is energy E HOMO (E B At least one, preferably each TADF material E, having ) B The highest occupied orbit HOMO(E) B ) has even higher energy: E HOMO (P B )>E HOMO (E B ).

[0134] 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 orbital HOMO(P B ) is energy E HOMO (H B At least one, preferably each host material H, having ) B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (P B )>E HOMO (H B ).

[0135] In one embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (P B At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) is energy E HOMO (H B At least one, preferably each host material H, having ) B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (P B )>E HOMO (H B ).

[0136] 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 orbital HOMO(P B ) is energy E HOMO (H B At least one, preferably each host material H, having ) B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (P B )>E HOMO (H B ).

[0137] 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 orbital HOMO(P B ) is energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B ) has even higher energy: E HOMO (P B )>E HOMO (S B ).

[0138] In one embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (P B At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) is energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) BThe highest occupied orbital HOMO(S B ) has even higher energy: E HOMO (P B )>E HOMO (S B ).

[0139] 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 orbital HOMO(P B ) is energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B ) has even higher energy: E HOMO (P B )>E HOMO (S B ).

[0140] In one embodiment of the present invention, at least one, preferably each energy E HOMO (P B ) Phosphorescent material P B The highest occupied orbital HOMO(P B ) and at least one, preferably each energy E HOMO (S B ) a small FWHM emitter S B The highest occupied orbital HOMO(S B The (energy) difference between ) and is less than 0.3 eV: E HOMO (P B )-E HOMO (S B ) < 0.3eV.

[0141] In one embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (P BAt least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference between ) and is less than 0.3 eV: E HOMO (P B )-E HOMO (S B ) < 0.3eV.

[0142] In one embodiment of the present invention, in each of the 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 orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference between ) and is less than 0.3 eV: E HOMO (P B )-E HOMO (S B ) < 0.3eV.

[0143] In one embodiment of the present invention, energy E HOMO (P B Each phosphorescent material P has ) B The highest occupied orbital HOMO(P B ) and energy E HOMO (S B Each small FWHM emitter S has ) B The highest occupied orbital HOMO(S B The (energy) difference between ) and is less than 0.2 eV: E HOMO (P B )-EHOMO (S B ) < 0.2eV.

[0144] In one embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (P B At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference with ) is less than 0.2 eV: E HOMO (P B )-E HOMO (S B ) < 0.2eV.

[0145] In one embodiment of the present invention, in each of the 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 orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference with ) is less than 0.2 eV: E HOMO (P B )-E HOMO (S B ) < 0.2eV.

[0146] 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 orbital HOMO(P B) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The (energy) difference between ) is greater than 0.0 eV and less than 0.3 eV: 0.0eV <E HOMO (P B )-E HOMO (S B ) < 0.3eV.

[0147] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (P B At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0eV <E HOMO (P B )-E HOMO (S B ) < 0.3eV.

[0148] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy E HOMO (P B At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0eV <E HOMO (P B )-E HOMO (S B ) < 0.3eV.

[0149] 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 orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The (energy) difference between ) is 0.1 eV or greater and 0.8 eV or less: 0.1eV≦E HOMO (P B )-E HOMO (S B ) ≤ 0.8eV.

[0150] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has energy E HOMO (P B At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference between this and ) is 0.1 eV or greater and 0.8 eV or less: 0.1eV≦E HOMO (P B )-E HOMO (S B ) ≤ 0.8eV.

[0151] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, energy -E HOMO (PB At least one, preferably each phosphorescent material P, having ) B The highest occupied orbital HOMO(P B ) and energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S, having ) B The highest occupied orbital HOMO(S B The energy difference between this and ) is 0.1 eV or greater and 0.8 eV or less: 0.1eV≦E HOMO (P B )-E HOMO (S B ) ≤ 0.8eV.

[0152] In a preferred embodiment of the present invention, the following requirements are met: (i) Each host material H B is energy E LUMO (H B ) has the lowest open orbit LUMO(H B ) has, (ii) Each phosphorescent material P B is energy E LUMO (P B ) has the lowest airspace LUMO(P B ) has, (iii) Each small half-width (FWHM) emitter S B is energy E LUMO (S B ) has the lowest airspace orbit LUMO(S B ) has, (iv) Each thermally activated delayed fluorescence (TADF) material E B is energy E LUMO (E B ) has the lowest airspace LUMO(E B ) has, Here, the relationships expressed by equations (12) and (13) below apply: E LUMO (E B ) <E LUMO (H B ) (12) E LUMO (EB ) <E LUMO (P B ) (13).

[0153] In one embodiment, the aforementioned relationship represented by formulas (12) and (13) applies to a material included in any one of at least one light-emitting layer B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationship represented by formulas (12) and (13) applies to a material included in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0154] In one embodiment of the present invention, the organic electroluminescent element includes at least one light-emitting layer B consisting of one or more sublayers, wherein the one or more sublayers of the light-emitting layer B include the following: (i) Energy E LUMO (H B ) has the lowest open orbit LUMO(H B ) Host material H B , (ii) Energy E LUMO (P B ) has the lowest airspace LUMO(P B ) Phosphorescent material P B , (iii) Energy E LUMO (S B ) has the lowest airspace orbit LUMO(S B ) a small FWHM emitter S B , and (iv) Energy E LUMO (E B ) has the lowest airspace LUMO(E B ) has a thermally activated delayed fluorescence (TADF) material E B , Here, the relationship expressed by equations (12) through (14) below applies: E LUMO (E B ) <E LUMO (H B ) (12) E LUMO (E B ) <E LUMO (PB ) (13) E LUMO (E B ) <E LUMO (S B ) (14).

[0155] In one embodiment, the aforementioned relationships represented by formulas (12) to (14) apply to the material contained in any one of the at least one light-emitting layer B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (12) to (14) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0156] In one embodiment of the present invention, the relationship represented by the following formulas (10) to (13) applies: E HOMO (P B )>E HOMO (H B ) (10) E HOMO (P B )>E HOMO (S B ) (11) E LUMO (E B ) <E LUMO (H B ) (12) E LUMO (E B ) <E LUMO (P B ) (13).

[0157] In one embodiment, the aforementioned relationships represented by formulas (10) to (13) apply to the material contained in any one of the at least one light-emitting layer B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (10) to (13) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0158] In one embodiment of the present invention, the relationships represented by the following formulas (10) to (14) apply: EHOMO (P B )>E HOMO (H B ) (10) E HOMO (P B )>E HOMO (S B ) (11) E LUMO (E B )<E LUMO (H B ) (12) E LUMO (E B )<E LUMO (P B ) (13) E LUMO (E B )<E LUMO (S B ) (14).

[0159] In one embodiment, the above-described relationship represented by formulas (10) to (14) is applied to a material contained in any one of at least one light-emitting layer B of the organic electroluminescence device according to the present invention. In one embodiment, the above-described relationship represented by formulas (10) to (14) is applied to materials contained in the same light-emitting layer B of the organic electroluminescence device according to the present invention.

[0160] In one embodiment of the present invention, at least one, preferably each, energy E LUMO (S B ) of a small full width at half maximum (FWHM) emitter S B The lowest unoccupied molecular orbital LUMO(S B ) is at least one, preferably each, energy E LUMO (E B ) of a thermally activated delayed fluorescence (TADF) material E B The lowest unoccupied molecular orbital LUMO(E B ) is higher in energy: E LUMO (S[[ID=7%]] B )>E LUMO (E B ). <0006​​In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) is at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (S B )>E LUMO (E B ).

[0162] In one embodiment of the present invention, in each of the at least one light-emitting layers B, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) is at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (S B )>E LUMO (E B ).

[0163] In one embodiment of the present invention, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) and at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(EB ) and the energy difference is less than 0.3 eV: E LUMO (S B ) - E LUMO (E B ) < 0.3 eV.

[0164] 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 the energy E LUMO (S B ) having a small full width at half maximum (FWHM) emitter S B 's lowest unoccupied molecular orbital LUMO(S B ) and at least one, preferably each, of the energy E LUMO (E B ) having a thermally activated delayed fluorescence (TADF) material E B 's lowest unoccupied molecular orbital LUMO(E B ) and the energy difference is less than 0.3 eV: E LUMO (S B ) - E LUMO (E B ) < 0.3 eV.

[0165] In one embodiment of the present invention, in each of at least one light-emitting layer B, at least one, preferably each, of the energy E LUMO (S B ) having a small full width at half maximum (FWHM) emitter S B 's lowest unoccupied molecular orbital LUMO(S​​​​​​​​​​​​​​​​​​​​​​​​LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) and at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B The (energy) difference between ) and is less than 0.2 eV: E LUMO (S B )-E LUMO (E B ) < 0.2eV.

[0167] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) and at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B The energy difference with ) is less than 0.2 eV: E LUMO (S B )-E LUMO (E B ) < 0.2eV.

[0168] In one embodiment of the present invention, in each of the at least one light-emitting layers B, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) and at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E BThe energy difference with ) is less than 0.2 eV: E LUMO (S B )-E LUMO (E B ) < 0.2eV.

[0169] In one embodiment of the present invention, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) and at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0eV <E LUMO (S B )-E LUMO (E B ) < 0.3eV.

[0170] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) and at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0eV <E LUMO (S B )-E LUMO (E B ) < 0.3eV.

[0171] In one embodiment of the present invention, in each of the at least one light-emitting layers B, at least one, preferably each, energy E LUMO (S B ) a small FWHM emitter S B Lowest altitude orbit LUMO(S B ) and at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0eV <E LUMO (S B )-E LUMO (E B ) < 0.3eV.

[0172] In one embodiment of the present invention, each energy E LUMO (P B ) Phosphorescent material P B Lowest orbital LUMO(P B ) are the respective energies E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (P B )>E LUMO (E B ).

[0173] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably each, energy E LUMO (P B ) Phosphorescent material P B Lowest orbital LUMO(P B ) is at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (P B )>E LUMO (E B ).

[0174] In one embodiment of the present invention, in each of the at least one light-emitting layers B, at least one, preferably each, energy E LUMO (P B ) Phosphorescent material P B Lowest orbital LUMO(P B ) is at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (P B )>E LUMO (E B ).

[0175] In one embodiment of the present invention, each energy E LUMO (H B ) Host material H B Lowest airspace orbit LUMO(H B ) are the respective energies E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (H B )>E LUMO (E B ).

[0176] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably each, energy E LUMO (H B ) Host material H B Lowest airspace orbit LUMO(H B ) is at least one, preferably each, energy E LUMO (EB ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (H B )>E LUMO (E B ).

[0177] In one embodiment of the present invention, in each of the at least one light-emitting layers B, at least one, preferably each, energy E LUMO (H B ) Host material H B Lowest airspace orbit LUMO(H B ) is at least one, preferably each, energy E LUMO (E B ) TADF material E B Lowest orbital LUMO(E B ) has even higher energy: E LUMO (H B )>E LUMO (E B ).

[0178] Relationship of emission maxima In one embodiment of the present invention, the relationships represented by formulas (16) and (17) apply: |E λmax (P B )-E λmax (S B )|<0.30eV (16) |E λmax (E B )-E λmax (S B )|<0.30eV (17).

[0179] This means the following: phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum energy of light emission E λmax (P B ) and a small FWHM emitter S in the context of the present invention, given in electron volts (eV) BThe maximum energy of light emission E λmax (S B The energy difference with ) is less than 0.30 eV. And, the TADF material E in the context of the present invention given in electron volts (eV) B The maximum energy of light emission E λmax (E B ) and a small FWHM emitter S in the context of the present invention, given in electron volts (eV) B The maximum energy of light emission E λmax (S B The energy difference with ) is less than 0.30 eV.

[0180] In one embodiment, the aforementioned relationships represented by formulas (16) and (17) apply to the material contained in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (16) and (17) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0181] The organic electroluminescent element includes at least one light-emitting layer B consisting of one or more sublayers, the one or more sublayers being adjacent to each other and collectively comprising the following: (i) at least one host material H B , (ii) Energy E λmax (P B ) with maximum emission λ max (P B ) at least one phosphorescent material P B , (iii) Energy E λmax (S B ) has a maximum emission λ max (S B A small FWHM emitter S that has ) and emits light having a FWHM of 0.25 eV or less B , and (iv) Energy E λmax (E B ) with maximum emission λ max (E B) at least one thermally activated delayed fluorescence (TADF) material E B , 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 The material comprises at least one (emitter) material selected from the group consisting of the following, and the relationship expressed by the following formulas (16) and (17) applies: |E λmax (P B )-E λmax (S B )|<0.30eV (16) |E λmax (E B )-E λmax (S B )|<0.30eV (17).

[0182] In a preferred embodiment of the present invention, the relationships represented by formulas (18) and (19) apply: |E λmax (P B )-E λmax (S B )|<0.20eV (18) |E λmax (E B )-E λmax (S B )|<0.20eV (19).

[0183] This means the following: phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum energy of light emission E λmax (P B ) and a small FWHM emitter S in the context of the present invention, given in electron volts (eV) B The maximum energy of light emission E λmax (S B The energy difference with ) is less than 0.20 eV. And, the TADF material E in the context of the present invention given in electron volts (eV) B The maximum energy of light emission E λmax (E B) and a small FWHM emitter S in the context of the present invention, given in electron volts (eV) B The maximum energy of light emission E λmax (S B The energy difference with ) is less than 0.20 eV.

[0184] In one embodiment, the aforementioned relationship represented by formulas (18) and (19) is included in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention. This applies to the material in which the formulas (18) and (19) described above apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0185] One embodiment of the present invention relates to an organic electroluminescent element, which is, (ii) at least one phosphorescent material P B is energy E λmax (P B ) with maximum emission λ max (P B ) has, (iii) at least one small FWHM emitter S B is energy E λmax (S B ) with maximum emission λ max (S B ) has, where S B It emits light with a half-width (FWHM) of 0.25 eV or less. (iv) At least one thermally activated delayed fluorescence (TADF) material E B is energy E λmax (E B ) with maximum emission λ max (E B ) has, Here, equations (18) and (19) apply: |E λmax (P B )-E λmax (S B )|<0.20eV (18) |Eλmax (E B )-E λmax (S B )|<0.20eV (19).

[0186] In a more preferred embodiment of the present invention, the relationships represented by formulas (20) and (21) apply: |E λmax (P B )-E λmax (S B )|<0.1eV (20) |E λmax (E B )-E λmax (S B )|<0.10eV (21).

[0187] This means the following: phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum energy of light emission E λmax (P B ) and a small FWHM emitter S in the context of the present invention, given in electron volts (eV) B The maximum energy of light emission E λmax (S B The energy difference with ) is less than 0.10 eV. And, given in electron volts (eV), the TADF material E in the context of the present invention B The maximum energy of light emission E λmax (E B ) and a small FWHM emitter S in the context of the present invention, given in electron volts (eV) B The maximum energy of light emission E λmax (S B The energy difference with ) is less than 0.10 eV.

[0188] In one embodiment, the aforementioned relationships represented by formulas (20) and (21) apply to the material contained in at least one of the light-emitting layers B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (20) and (21) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0189] In one embodiment of the present invention, the relationship represented by formula (22) applies: E λmax (P B )>E λmax (S B ) (twenty two).

[0190] This refers to phosphorescent material P in the context of the present invention, given in electron volts (eV). B The maximum energy of light emission E λmax (P B ) is a small FWHM emitter S given in electron volts (eV) in the context of the present invention. B The maximum energy of light emission E λmax (S B ) means higher than

[0191] In one embodiment, the aforementioned relationship represented by formula (22) applies to a material included in any one of at least one light-emitting layer B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationship represented by formula (22) applies to a material included in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0192] In one embodiment of the present invention, the relationship represented by formula (22-a) applies: E λmax (E B )>E λmax (S B ) (22-a).

[0193] This is TADF material E in the context of the present invention given in electron volts (eV). B The maximum energy of light emission E λmax (E B ) is a small FWHM emitter S given in electron volts (eV) in the context of the present invention. B The maximum energy of light emission E λmax (S B ) means higher than

[0194] In one embodiment, the aforementioned relationship represented by formula (22-a) applies to a material included in any one of at least one light-emitting layer B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationship represented by formula (22-a) applies to a material included in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0195] Element hue and performance Further embodiments of the present invention relate to an electroluminescent element (e.g., an OLED) that emits light in distinct color points. According to the present invention, the electroluminescent element (e.g., an OLED) emits light in a narrow emission band (small full width at half maximum (FWHM)). In a preferred embodiment, the electroluminescent element (e.g., an OLED) according to the present invention emits light with a main emission peak FWHM of less than 0.25 eV, preferably less than 0.20 eV, more preferably less than 0.15 eV, or even more preferably less than 0.13 eV.

[0196] A further embodiment of the present invention is 1000 cd / m². 2 This relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 18%, or even more preferably more than 20% in (nit), and shows maximum emission in the range of 500 nm to 560 nm.

[0197] A further embodiment of the present invention is 1000 cd / m². 2 This relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 18%, or even more preferably more than 20%, and shows maximum emission in the range of 510 nm to 550 nm.

[0198] A further embodiment of the present invention is 1000 cd / m². 2This relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 18%, or even more preferably more than 20%, and shows maximum emission in the range of 515 nm to 540 nm.

[0199] In a preferred embodiment, the electroluminescent element (e.g., OLED) has a constant current density J0 = 15 mA / cm². 2 In this case, the LT95 value is observed to be greater than 100 hours, preferably greater than 200 hours, more preferably greater than 300 hours, even more preferably greater than 400 hours, even more preferably greater than 750 hours, or even more preferably greater than 1000 hours.

[0200] Further embodiments of the present invention relate to an electroluminescent element (e.g., OLED) that emits light at distinct color points. According to the present invention, the electroluminescent element (e.g., OLED) emits light having a narrow emission band (small full width at half maximum (FWHM)). In a preferred embodiment, the electroluminescent element according to the present invention (e.g. The OLED emits light having an FWHM with a main emission peak of less than 0.25 eV, preferably less than 0.20 eV, more preferably less than 0.15 eV, or even more preferably less than 0.13 eV.

[0201] Further embodiments of the present invention relate to an electroluminescent element (e.g., OLED) that emits light having CIEx and CIEy color coordinates close to the color coordinates of primary green (CIEx=0.170 and CIEy=0.797) as defined by ITU-R Recommendation BT.2020 (Rec.2020), which is suitable for use in UHD (Ultra High Definition) displays, such as UHD-TVs. The term “close” here refers to the range of CIEx and CIEy coordinates provided at the end of this paragraph. In commercial applications, top-emission elements (with a transparent top electrode) are typically used, while the test elements used throughout the present invention represent bottom-emission elements (with a transparent bottom electrode and substrate). Therefore, further aspects of the present invention relate to electroluminescent elements (e.g., OLEDs) in which the light emission exhibits CIEx color coordinates of 0.15 to 0.45, preferably 0.15 to 0.35, more preferably 0.15 to 0.30, even more preferably 0.15 to 0.25, or even more preferably 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, even more preferably 0.75 to 0.86, or even more preferably 0.79 to 0.84.

[0202] Further embodiments of the present invention relate to an OLED that emits light having 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-emission elements (with a transparent top electrode) are typically used, while the test elements used throughout the present invention represent bottom-emission elements (with a transparent bottom electrode and substrate). 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, even more preferably 0.24 to 0.28, or even more preferably 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, even more preferably 0.62 to 0.68, or even more preferably 0.64 to 0.66.

[0203] A further embodiment of the present invention is 1000 cd / m². 2 This relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 18%, or even more preferably more than 20%, and shows maximum emission in the range of 420 nm to 500 nm.

[0204] A further embodiment of the present invention is 1000 cd / m². 2 This relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 18%, or even more preferably more than 20%, and shows maximum emission in the range of 440 nm to 480 nm.

[0205] A further embodiment of the present invention is 1000 cd / m². 2 In this case, more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 18%, or More preferably, the invention relates to an electroluminescent device (e.g., an OLED) that exhibits an external quantum efficiency exceeding 20% ​​and shows maximum light emission in the range of 450 nm to 470 nm.

[0206] A further embodiment of the present invention is 1000 cd / m². 2 In this case, it exhibits an external quantum efficiency of more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 18%, or even more preferably more than 20%, and shows a maximum emission of 420nm to 500nm, preferably more preferably 430nm to 490nm, more preferably 440nm to 480nm, and even more preferably 450nm to 470nm, and / or 500cd / m². 2 This relates to an electroluminescent element (e.g., OLED) that exhibits an LT80 value exceeding 100h, preferably exceeding 200h, more preferably exceeding 400h, even more preferably exceeding 750h, or even more preferably exceeding 1000h.

[0207] Further embodiments of the present invention relate to an electroluminescent element (e.g., an OLED) that emits light at distinct color points. According to the present invention, the electroluminescent element (e.g., an OLED) emits light having a narrow emission band (small full width at half maximum (FWHM)). In a preferred embodiment, the electroluminescent element (e.g., an OLED) according to the present invention emits light having an FWHM of a main emission peak of less than 0.25 eV, preferably less than 0.20 eV, more preferably less than 0.15 eV, or even more preferably less than 0.13 eV.

[0208] Further embodiments of the present invention relate to an electroluminescent element (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 by ITU-R Recommendation BT.2020 (Rec.2020), which is suitable for use in 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-emission elements (with a transparent top electrode) are typically used, while the test elements used throughout the present invention represent bottom-emission elements (with a transparent bottom electrode and substrate). The CIEy color coordinates of a blue element decrease by up to twofold when changing from a bottom-emission element to a top-emission element, but the CIEx remains almost unchanged (Okinaka et al., Society for Information Display International Symposium Digest of Technical Papers, 2015, 46(1): 312-313, DOI:10.1002 / sdtp.10480). Therefore, a further aspect of the present invention relates to an OLED in which the light emission exhibits CIEx color coordinates of 0.02 to 0.30, preferably 0.03 to 0.25, more preferably 0.05 to 0.20, even more preferably 0.08 to 0.18, or even more preferably 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, even more preferably 0.03 to 0.15, or even more preferably 0.04 to 0.10.

[0209] A further embodiment of the present invention is 1000 cd / m². 2In this configuration, it exhibits an external quantum efficiency of over 8%, preferably over 10%, more preferably over 13%, even more preferably over 15%, or even more preferably over 20%, and / or exhibits a maximum emission of 590nm to 690nm, preferably 610nm to 665nm, more preferably 620nm to 640nm, and / or 500cd / m². 2 This relates to an electroluminescent element (e.g., OLED) that exhibits an LT80 value exceeding 100h, preferably exceeding 200h, more preferably exceeding 400h, even more preferably exceeding 750h, or even more preferably exceeding 1000h. Therefore, further aspects of the present invention This relates to an OLED whose luminescence exhibits a CIEy color coordinate greater than 0.25, preferably greater than 0.27, more preferably greater than 0.29, and even more preferably greater than 0.30.

[0210] Further embodiments of the present invention relate to an electroluminescent element (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 by ITU-R Recommendation BT.2020 (Rec.2020), which is suitable for use in 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-emission elements (with a transparent top electrode) are typically used, while the test elements used throughout the present invention represent bottom-emission elements (with a transparent bottom electrode and substrate). Therefore, a further aspect of the present invention relates to an OLED in which the light emitted exhibits CIEx color coordinates of 0.60 to 0.88, preferably 0.61 to 0.83, more preferably 0.63 to 0.78, even more preferably 0.66 to 0.76, or even more preferably 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, even more preferably 0.28 to 0.40, or even more preferably 0.29 to 0.35.

[0211] Therefore, a further aspect of the present invention is 14500 cd / m². 2 The present invention relates to an electroluminescent device (e.g., OLED) that exhibits an external quantum efficiency of more than 10%, preferably more than 13%, more preferably more than 15%, even more preferably more than 17%, or even more preferably more than 20%, and / or exhibits maximum emission at 590nm to 690nm, preferably 610nm to 665nm, more preferably 620nm to 640nm.

[0212] One of the purposes of interest for organic electroluminescent elements is the generation of light. Therefore, the present invention also relates to a method for generating light in a desired wavelength range, comprising the step of providing an organic electroluminescent element according to any present invention.

[0213] Therefore, a further aspect of the present invention relates to a method for generating light in a desired wavelength range, comprising the following steps: (i) To provide an organic electroluminescent element according to the present invention, and (ii) Applying an electric current to the organic electroluminescent element.

[0214] Further aspects of the present invention relate to a method for fabricating an organic electroluminescent element by configuring the aforementioned elements. The present invention also relates to a method for generating green light, in particular by using the organic electroluminescent element.

[0215] A further aspect of the present invention relates to an organic electroluminescent element applied to a material in which at least one, preferably exactly one, of the relationships represented by the following formulas (23) to (25) is included in the same light-emitting layer B: 440nm<λ max (S B )<470nm (23) 510nm<λ max (S B )<550nm (24) 610nm<λ max (S B )<665nm (25) Here, .'' max (S B ) includes at least one, preferably each small FWHM emitter S B This is the maximum emission value, given in nanometers (nm).

[0216] In one embodiment of the present invention, at least one, preferably exactly one, of the relationships represented by the following formulas (23) to (25) applies to a material included in any one of the at least one light-emitting layer B of the organic electroluminescent element according to the present invention.

[0217] A further aspect of the present invention relates to a method for generating light, comprising the following steps: (i) To provide an organic electroluminescent element according to the present invention, and (ii) Applying an electric current to the organic electroluminescent element.

[0218] A further aspect of the present invention relates to a method for generating light, comprising the following steps: (i) To provide an organic electroluminescent element according to the present invention, and (ii) Applying an electric current to the organic electroluminescent element, Here, the method described above is for generating light in a wavelength range selected from one of the following wavelength ranges: (i) 510nm to 550nm, or (ii) 440nm to 470nm, or (iii) 610nm to 665nm.

[0219] Those skilled in the art will know that at least one TADF material E B and at least one phosphorescent material P B (See below) can be used as an emitter in an organic electroluminescent device. However, preferably, in the organic electroluminescent device according to the present invention, at least one TADF material E B and at least one phosphorescent material P BIts primary function is not to emit light. In a preferred embodiment, when a voltage (and current) is applied, the organic electroluminescent element according to the present invention emits light, and this light emission is mainly (i.e., more than 50%, preferably more than 60%, more preferably more than 70%, even more preferably more than 80%, or even more preferably more than 90%) from at least one small FWHM emitter S B This is due to fluorescence emitted by the ion. As a result, the organic electroluminescent element according to the present invention exhibits a narrow emission represented by a small FWHM with a main emission peak, preferably less than 0.25 eV, more preferably less than 0.20 eV, even more preferably less than 0.15 eV, or even more preferably less than 0.13 eV.

[0220] In a preferred embodiment of the present invention, the relationship represented by the following formula (26) applies: JPEG0007894358000001.jpg1379 Here, FWHM D This refers to the full width at half maximum (FWHM) in electron volts (eV) of the main emission peak of the organic electroluminescent element according to the present invention. FWHM SB FWHM D One or more host materials H used in the light-emitting layer (EML) of an organic electroluminescent element having FWHM B One or more small FWHM emitters S inside B The FWHM in electron volts (eV) of the photoluminescence spectrum (fluorescence spectrum measured at room temperature, i.e., approximately 20°C) of the spin-coated film is shown. SB The spin coating film used to determine this is preferably the same weight ratio as the light-emitting layer B of the organic electroluminescent element and the same small FWHM emitter or emitter S. B Includes.

[0221] For example, two small FWHM emitters S, each having a light-emitting layer B with a concentration of 1% by weight. BIf it includes, the spin coating film preferably contains two small FWHM emitters S, each at 1% by weight. B This includes. In an exemplary case, the matrix material of the spin coating film would amount to 98% by weight of the spin coating film. The matrix material of the film is the host material H contained in the light-emitting layer B of the organic electroluminescent element. B It can be selected to reflect the weight ratio of the two. In the example above, the light-emitting layer B is a single host material H B If it includes, the host material is preferably also the sole matrix material of the spin-coated film. However, in the above example, if the light-emitting layer B is two types of host material H B If it contains, one has a content of 60% by weight and the other has a content of 20% by weight (i.e., a 3:1 ratio), then the spin coating film (two types of small FWHM emitters, each 1% by weight) B The aforementioned matrix material (including) preferably consists of two host materials H present in the EML. B It is also a 3:1 mixture.

[0222] When the organic electroluminescent element according to the present invention includes one or more light-emitting layers B, the relationship represented by formula (26) preferably applies to all light-emitting layers B included in the element.

[0223] In one embodiment, the above-mentioned FWHM is applied to at least one light-emitting layer B of the organic electroluminescent element according to the present invention. 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 more preferably 1.10.

[0224] In one embodiment, the aforementioned FWHM is applied to each light-emitting layer B of the organic electroluminescent element according to the present invention. D :FWHM SBThe ratio is 1.50 or less, preferably 1.40 or less, more preferably 1.30, even more preferably 1.20, or even more preferably 1.10.

[0225] Small FWHM emitter S in the context of the present invention B It should be noted that for the selection of a fluorescent emitter for use as such, the FWHM value is determined as described in a later section (briefly, preferably from a spin-coated film of each emitter in poly(methyl methacrylate) PMMA having a concentration of 1-5% by weight, particularly 2% by weight, or from a solution, see below). That is, exemplary small FWHM emitters S shown in Table 1S B The FWHM value is given in the context of formula (26) and preferred embodiments related to the present invention. SB It is not understood as a value.

[0226] The examples and claims further illustrate the present invention.

[0227] Host material H B According to the present invention, any one or more host materials H included in any at least one light-emitting layer B B p-host H exhibits high hole mobility. P n-host H exhibits high electron mobility N , or bipolar host material H exhibiting both high hole mobility and high electron mobility BP But so.

[0228] In the context of the present invention, n-host H exhibiting high electron mobility N Preferably, -2.50 eV or less (E LUMO (H N )≦-2.50eV), comfortable, E LUMO (H N )≦-2.60eV, more preferably E LUMO (H N )≦-2.65eV, more preferably E LUMO (H NLUMO energy E ) ≤ -2.70 eV LUMO (H N ) has. The LUMO is the lowest unsaturated orbit. The energy of the LUMO is determined as described in the following section.

[0229] In the context of the present invention, p-host H exhibiting high hole mobility P Preferably, -6.30 eV or higher (E HOMO (H P )≧-6.30eV), comfortably, E HOMO (H P )≧-5.90eV, more preferably E HOMO (HP)≧-5.70eV, more preferably E HOMO (H P )≧-5.40eV, or more preferably, E HOMO (H P HOMO energy E ≥ -2.60 eV HOMO (H P ) has. The HOMO is the highest occupied orbital. The energy of the HOMO is determined as described in the following section.

[0230] In one embodiment of the present invention, each host material H B is -6.30 eV or higher (E HOMO (H P )≧-6.30eV), preferably E HOMO (H P )≧-5.90eV, comfortably, E HOMO (H P )≧-5.70eV, more preferably E HOMO (H P HOMO energy E ≥ -5.40 eV HOMO (H P ) possessing p-host H P Therefore, the HOMO is the highest occupied orbit. The energy of the HOMO is determined as described in the following section.

[0231] In one embodiment of the present invention, at least one, preferably each p-host H PThis is a HOMO energy E smaller than -5.60 eV. HOMO (H P ) has.

[0232] In one embodiment of the present invention, the organic electroluminescent element includes at least one light-emitting layer B consisting of one or more sublayers, the one or more sublayers being adjacent to each other and collectively comprising the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) at least one host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) at least one phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1 S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has ) and emits light having a FWHM of 0.25 eV or less B , and selectively (iv) Lowest excited singlet state energy level E(S1 E ) and the lowest excited triplet state energy level E(T1 E ) at least one thermally activated delayed fluorescence (TADF) material E B , 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 includes at least one (emitter) material selected from the group consisting of, Here, at least one host material H B This is an energy E less than -5.60 eV. HOMO (H B ) has the highest occupied orbit HOMO(H B) and preferably each host material H B This is an energy E less than -5.60 eV. HOMO (H B ) has the highest occupied orbit HOMO(H B ) has.

[0233] 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) ≤ -2.50 eV LUMO (H BP ) has. More preferably, E LUMO (H BP ) ≤ -2.60 eV, and more preferably E LUMO (H BP ) ≤ -2.65eV, and more preferably, E LUMO (H BP ) ≤ -2.70 eV. The LUMO is the lowest unsaturated orbit. The energy of the LUMO is determined as described in the following section.

[0234] 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 )≧-6.30eV), comfortably, E HOMO (H BP HOMO energy E ≥ -5.90 eV HOMO (H BP ) has. More preferably, E HOMO (H BP )≧-5.70eV, and more preferably, E HOMO (H BP ) ≥ -5.40 eV. HOMO is the highest occupied orbital. The energy of HOMO is determined as described in the following section.

[0235] In one embodiment of the present invention, a bipolar host material H BP Preferably, both poles Sex host material H BP It satisfies all of the following requirements: (i) (E) ≤ 2.50 eV LUMO (H BP )≦-2.50eV)LUMO energy E LUMO (H BP ) has. Preferably, E LUMO (H BP ) ≤ -2.60 eV, and more preferably, E LUMO (H BP ) ≤ -2.65eV, and more preferably E LUMO (H BP ) ≤ -2.70 eV. The LUMO is the lowest unsaturated orbit. The energy of the LUMO is determined as described in the following section.

[0236] (ii) -6.30eV or more (E HOMO (H BP )≧-6.30eV), preferably E HOMO (H BP HOMO energy E ≥ -5.90 eV HOMO (H BP ) has. More preferably, E HOMO (H BP )≧-5.70eV, and more preferably E HOMO (H BP ) ≥ -5.40 eV. HOMO is the highest occupied orbital. The energy of HOMO is determined as described in the following section.

[0237] Those skilled in the art will know what materials are suitable host materials for use in the organic electroluminescent elements according to the present invention. See the following examples: Y.Tao, C.Yang, J.Quin, Chemical Society Reviews 2011, 40, 2943, DOI: 10.1039 / C0CS00160K; KSYook, JYLee, 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; Q.Wang, Q.-S.Tian, ​​Y.-L.Zhang, X.Tang, L.-S.Liao, Journal of Materials Chemistry C2019, 7, 11329, DOI: 10.1039 / C9TC03092A.

[0238] Also, for example, US2006006365(A1), US2006208221(A1), US2005069729(A1), EP1205527(A1), US2009302752(A1), US20090134784(A1), US2009302742(A1), US2010187977(A 1), 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 host materials usable in organic electroluminescent elements according to the present invention. This is understood not to mean that the present invention is limited to organic electroluminescent elements comprising host materials disclosed in the cited reference documents. Furthermore, any host material used in the latest technology may be a suitable host material H in the context of the present invention. B It is understood that this is the case.

[0239] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention comprises one or more p-host H PThis includes. In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention comprises only a single host material, and the host material is p-host H P That is the case.

[0240] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention comprises one or more n-host H N This includes. In other embodiments of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention comprises only a single host material, wherein the host material is n-host H N That is the case.

[0241] In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention comprises one or more bipolar host H BP This includes. In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention comprises only a single host material, and the host material is a bipolar host H BP That is the case.

[0242] In another embodiment of the present invention, at least one light-emitting layer B of the organic electroluminescent element according to the present invention contains at least two distinct host materials H. In this case, one or more host materials H are present in each light-emitting layer B. B These are all p-host H P Either they are n-host H N Either they are bipolar host H BP However, it is also a combination of those.

[0243] If the organic electroluminescent element according to the present invention includes one or more light-emitting layers B, then any one of them is independent of the other one or more light-emitting layers B and is a host material H to which the above definition applies. B or one or more host materials H BIt is understood that this includes [the specified material]. Furthermore, it is understood that the different light-emitting layers B contained in the organic electroluminescent element according to the present invention do not necessarily all contain the same material, or more preferably, they do not contain the same material at the same concentration.

[0244] When the light-emitting layer B of the organic electroluminescent element according to the present invention is composed of one or more sublayers, any one of them is a host material H to which the above definition applies, independently of the other one or more sublayers. B or one or more host materials H B It is understood that this includes [the specified element]. Furthermore, it is understood that the different sublayers of the light-emitting layer B contained in the organic electroluminescent element according to the present invention do not necessarily all contain the same material, or more preferably, the same material at the same concentration.

[0245] When included in the same light-emitting layer B of the organic electroluminescent element according to the present invention, At least one p-host H P and at least one n-host H N H can selectively form an exciplex. Those skilled in the art will know that H can form an exciplex. P and H N A method for selecting a pair of H P and H N The selection criteria, including the HOMO- and / or LUMO-energy level requirements, are known. That is, if exciplex formation is required, the p-host material H P The highest occupied orbital (HOMO) is in the n-host material H N The energy of the HOMO is at least 0.20 eV higher, and the p-host material H P The lowest unoccupied orbital (LUMO) is the n-host material H N Its energy is at least 0.20 eV higher than the LUMO.

[0246] In a preferred embodiment of the present invention, at least one host material H B (For example, H P HN and / or H BP ) is an organic host material, which in the context of the present invention means that it does not contain any transition metals. In a preferred embodiment of the present invention, all host materials H of the electroluminescent element of the present invention B (H P H N and / or H BP ) are organic host materials, which in the context of the present invention means that 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 ) is mainly composed of hydrogen (H), carbon (C), and nitrogen (N), but may also contain, for example, oxygen (O), boron (B), silicon (Si), fluorine (F), and bromine (Br).

[0247] In one embodiment of the present invention, each host material H B p-host H P That is the case.

[0248] In a preferred embodiment of the present invention, p-host H is selectively included in any at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) as a whole. P This includes, or consists of: 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 structure containing any one of X, or a first chemical moiety composed of any one of X, and [ka] ...chemical formula H P -I

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[0249] Each has the chemical formula H P -XI, H P -XII, H P -XIII, H P - XIV, H P -X V, H P -XVI, H P -XVII, H P -XVIII and H P - A structure containing any one of XIX, or one or more second chemical parts composed thereof, [ka] ...Chemical formula H P -XI [ka] ...Chemical formula H P -XII [ka] ...Chemical formula H P -XIII [ka] ...Chemical formula H P -XIV [ka] ...Chemical formula H P -XV [ka] ...Chemical formula H P -XVI [ka] ...Chemical formula HP -XVII [ka] ...Chemical formula H P -XVIII [ka] ...Chemical formula H P -XIX Here, the p-host material H P Each of the at least one second chemical part present is connected to the first chemical part via a single bond represented by a dotted line in the chemical formula, Here, Z 1 In each case, they are independent of each other, directly bonded, 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, R I In each case, these are either single bond positions that independently link the first chemical part to the second chemical part, or selected from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, t Bu, and Me, i Pr, t Ph is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph. Here, at least one R I This is the bond position of a single bond that connects the first chemical part to the second chemical part. R II The group is selected from the following: Hydrogen, deuterium, Me, i Pr, t Bu, and Me, i Pr, tPh is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph. Here, two or more adjacent substituents R II It selectively uses aliphatic, aromatic, or heterozygous elements. Aromatic, carbocyclic, or heterocyclic systems, with 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 structures consisting of any one of XIX, but also adjacent substituents R II The fused ring system, consisting of additional rings selectively formed by this process, contains a total of 12 to 60 carbon atoms, preferably 14 to 32 carbon atoms.

[0250] In a more preferred embodiment of the present invention, Z 1 In each case, the bond is direct, and the adjacent substituent R II They do not combine to form additional ring systems.

[0251] In a more preferred embodiment of the present invention, p-host H is selectively included in the organic electroluminescent element according to the present invention. P The following structure is selected from the group: [ka] [ka] [ka] [ka] [ka] [ka]

[0252] In a preferred embodiment of the present invention, n-host H is selectively included in any at least one light-emitting layer B (consisting of one (sub) layer or including one or more sub) as a whole. N is the chemical formula H N -I, H N -II and H N -Includes or is composed of any one of III: [ka] ...Chemical formula H N -I [ka] ...Chemical formula H N -II [ka] ...Chemical formula H N -III Here, R III and R IV Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, Me, i Pr, t Ph is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph, and 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 that can be represented by any one of the XIV, [ka] ...Chemical formula H N -IV [ka] ...Chemical formula H N -V [ka] ...Chemical formula H N -VI [ka] ...Chemical formula H N -VII [ka] ...Chemical formula H N -VIII [ka] ...Chemical formula H N -IX [ka] ...Chemical formula H N -X [ka] ...Chemical formula H N -XI [ka] ...Chemical formula H N -XII [ka] ...Chemical formula H N -XIII [ka] ...Chemical formula H N -XIV Here, 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, HN-X, H N -XI, H N -XII, H N -XIII and H N - A structure consisting of any one of XIV is H N -I, H N -II and H N -III indicates the bonding position of a single bond that connects to a structure consisting of any one of the above. X 1 These are oxygen (O), sulfur (S), or C(R). V )2, R V Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, and Me, i Pr, t Ph is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph. Here, two or more adjacent substituents R V It selectively forms aliphatic, aromatic, or heteroaromatic, carbocyclic, or heterocyclic systems, 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 structures consisting of any one of XIV, but also adjacent substituents R V The fused ring system, consisting of additional rings selectively formed by the process, comprises a total of 8 to 60 carbon atoms, preferably 12 to 40 carbon atoms, more preferably 14 to 32 carbon atoms. Here, the chemical formula H N -I and H N -II has at least one substituent R III is CN.

[0253] In a more preferred embodiment of the present invention, n-host H is selectively included in the organic electroluminescent element according to the present invention. N The following structure is selected from the group: [ka] [ka] [ka]

[0254] In one embodiment of the present invention, n-host H included in any light-emitting layer B of the organic electroluminescent element 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).

[0255] TADF material E B According to the present invention, a thermally activated delayed fluorescence (TADF) material E BThe lowest excited singlet state energy level E(S1) is 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 more preferably less than 0.05 eV. E ) and the lowest excited triplet state energy level E(T1 E ΔE corresponds to the energy difference with ) ST It is characterized by showing a value. Therefore, the TADF material E according to the present invention B ΔE ST This is the lowest excited triplet state T1 at room temperature (RT, i.e., (approximately) 20°C). E From the lowest excited singlet state S1 E It is small enough to allow thermal repopulation (also known as up-term crossing or reverse-term crossing, or RISC).

[0256] Preferably, in the context of the present invention, the TADF material exhibits luminescence S1 through the recombination of charge carriers (holes and electrons). E Immediate fluorescence occurs when the state is reached, and T1 E From this state, luminescence S1 is transmitted via thermally activated RISC. E Both delayed fluorescence and delayed fluorescence are observed when the state is reached.

[0257] A small FWHM emitter S contained in the light-emitting layer B of the organic electroluminescent element according to the present invention B This is a selective ΔE less than 0.4eV. ST It is understood that it can have a value and exhibit thermally activated delayed fluorescence (TADF). However, in the context of the present invention, any small FWHM emitter S B In contrast, this is merely a selective feature.

[0258] 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 superposition between the absorption spectra of (when both spectra are measured under similar conditions). In this case, at least one TADF material E BThis is at least one small FWHM emitter S B It can transfer energy to it.

[0259] According to the present invention, TADF material E B It has maximum emission in the visible wavelength range of 380 nm to 800 nm, and generally, at room temperature (i.e., (approximately) 20°C), 10 wt% of TADF material E in poly(methyl methacrylate) PMMA. B It is measured at [location / location].

[0260] In one embodiment of the present invention, each TADF material E B It has maximum emission in the deep blue wavelength range of 380 nm to 470 nm, preferably 400 nm to 470 nm, and generally, at room temperature (i.e., (approximately) 20°C), 10 wt% of TADF material E in poly(methyl methacrylate) PMMA. B It is measured at [location / location].

[0261] In one embodiment of the present invention, each TADF material E B It has maximum emission in the green wavelength range of 480 nm to 560 nm, preferably 500 nm to 560 nm, and typically, at room temperature (i.e., (approximately) 20°C), 10 wt% of TADF material E in poly(methyl methacrylate) PMMA. B It is measured at [location / location].

[0262] In one embodiment of the present invention, each TADF material E B It has maximum emission in the red wavelength range of 600 nm to 665 nm, preferably 610 nm to 665 nm, and generally, 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (about) 20°C). B It is measured by [method]. In a preferred embodiment of the present invention, TADF material E B The maximum emission (peak emission) of a small FWHM emitter S in the context of the present invention B It is at a wavelength shorter than the maximum emission (peak emission) of the element.

[0263] In a preferred embodiment of the present invention, each TADF material E B This is an organic TADF material, which in the context of the present invention means that 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), but may also contain, for example, oxygen (O), boron (B), silicon (Si), fluorine (F), and bromine (Br).

[0264] In a preferred embodiment of the present invention, each TADF material E B It has a molecular weight of 800 g / mol or less.

[0265] In one embodiment of the present invention, TADF emitter E B It exhibits a photoluminescence quantum yield (PLQY) of 30% or more, and generally, 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C). B It is measured at [location / location].

[0266] In one embodiment of the present invention, TADF emitter E B It exhibits a photoluminescence quantum yield (PLQY) of 50% or more, and generally, 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C). B It is measured at [location / location].

[0267] In one embodiment of the present invention, TADF emitter E B It exhibits a photoluminescence quantum yield (PLQY) of over 70%, and generally, 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C). B It is measured at [location / location].

[0268] In one embodiment of the present invention, at least one, preferably each TADF material E B teeth, (i) Lowest excited singlet state energy level E(S1 E) and the lowest excited triplet state energy level E(T1 E ΔE corresponds to the energy difference with ) ST It is characterized by a value of less than 0.4eV, (ii) Exhibits a photoluminescence quantum yield (PLQY) greater than 30%.

[0269] In one embodiment of the present invention, each TADF material E B Lowest orbital LUMO(E B Energy E LUMO (E B ) is less than -2.6eV.

[0270] Those skilled in the art will know the TADF molecule E according to the present invention. B The method for designing it and the structural characteristics generally exhibited by the molecule are known. Simply put, to facilitate reverse intersystem crossing (RISC), ΔE ST Generally decreases, and in the context of the present invention, ΔE ST As mentioned above, this is less than 0.4 eV. This is because the TADF molecule E frequently separates the HOMO and LUMO spatially by the (electron) donor group and (electron) acceptor group, respectively. B This is achieved by designing such a structure. The structure is generally large in volume or twisted and connected via a spirojunction, reducing the spatial superposition of the HOMO and LUMO. However, the HOMO and LU Minimizing the spatial superposition of MOs has the disadvantage of also lowering the photoluminescence quantum yield (PLQY) of the TADF material. Therefore, when actually considering both of these effects, ΔE ST Reduce and achieve high PLQY.

[0271] One common approach to designing TADF materials is to covalently bond one or more (electron) donor regions where the HOMO is distributed and one or more (electron) acceptor regions where the LUMO is distributed to the same bridge, which is referred to in this application as a linker group. BFor example, it includes two or three linker groups bonded to the same acceptor portion, and further donor and acceptor portions may be bonded to each of those two or three linker groups.

[0272] Furthermore, one or more donor portions and one or more acceptor portions can be directly bonded to each other (without the presence of a linker group).

[0273] Typical donor moieties include diphenylamine, carbazole, acridine, phenoxazine, and derivatives of related structures.

[0274] Benzene, biphenyl groups, and derivatives of terphenyl groups to a certain extent are common linker groups.

[0275] Nitrile groups are very common acceptor moieties in TADF molecules, and well-known examples include: (i) Carbazolyl dicyanobenzene compounds such as 2CzPN (4,5-di(9H-carbazole-9-yl)phthalonitrile), DCzIPN (4,6-di(9H-carbazole-9-yl)isophthalonitrile), 4CzPN (3,4,5,6-tetra(9H-carbazole-9-yl)phthalonitrile), 4CzIPN (2,4,5,6-tetra(9H-carbazole-9-yl)isophthalonitrile), 4CzTPN (2,4,5,6-tetra(9H-carbazole-9-yl)terephthalonitrile) and their derivatives, (ii) Carbazolylcyanopyridine compounds such as 4CzCNPy(2,3,5,6-tetra(9H-carbazole-9-yl)-4-cyanopyridine) and its derivatives, (iii) Carbazolylcyanobiphenyl compounds such as CNBPCz (4,4',5,5'-tetra(9H-carbazol-9-yl)-[1,1'-biphenyl]-2,2'-dicarbonitrile), CzBPCN (4,4',6,6'-tetra(9H-carbazol-9-yl)-[1,1'-biphenyl]-3,3'-dicarbonitrile), DDCzIPN (3,3',5,5'-tetra(9H-carbazol-9-yl)-[1,1'-biphenyl]-2,2',6,6'-tetracarbonitrile) and their derivatives, Here, in these materials, one or more nitrile groups can be replaced with fluorine (F) or trifluoromethyl (CF3) as the acceptor moiety.

[0276] Furthermore, nitrogen heterocycles such as triazines, pyrimidines, triazoles, oxadiazoles, thiadiazoles, heptadine, 1,4-diazatriphenylene, benzothiazoles, benzoxazoles, quinoxalines, and diazafluorene derivatives are well-known acceptor moieties used in the construction of TADF molecules. For example, known examples of TADF molecules containing a triazine acceptor include PIC-TRZ(7,7'-(6-([1,1'-biphenyl]-4-yl)-1,3,5-triazine-2,4-diyl)bis(5-phenyl-5,7-dihydroindoro[2,3-b]carbazole)), mBFCzTrz(5-(3-(4,6-diphenyl-1,3,5-triazine-2-yl))phenyl)-5H-benzofl[3,2-c]carbazole), and DCzTrz(9,9'-(5-(4,6-diphenyl-1,3,5-triazine-2-yl)-1,3-phenylene)bis(9H-carbazole)).

[0277] Another group of TADF materials includes diaryl ketones such as benzophenone, or (heteroaryl)aryl ketones and their derivatives such as 4-benzoylpyridine, 9,10-anthraquinone, and 9H-xanthene-9-one, to which the donor moiety (mainly a carbazolyl substituent) is attached as an acceptor moiety. Examples of such TADF molecules include BPBCz (bis(4-(9'-phenyl-9H,9'H-[3,3'-bicarbazole]-9-yl)phenyl)methanone), mDCBP ((3,5-di(9H-carbazole-9-yl)phenyl)(pyridine-4-yl)methanone), AQ-DTBu-Cz (2,6-bis(4-(3,6-di-tert-butyl-9H-carbazole-9-yl)phenyl)anthracene-9,10-dione), and MCz-XT (3-(1,3,6,8-tetramethyl-9H-carbazole-9-yl)-9H-xanthene-9-one), respectively.

[0278] Furthermore, sulfoxides, particularly diphenyl sulfoxides, are commonly used as acceptor moieties for the composition of TADF materials. Well-known examples include 4-PC-DPS (9-phenyl-3-(4-(phenylsulfonyl)phenyl)-9H-carbazole), DitBu-DPS (9,9'-(sulfonylbis(4,1-phenylene))bis(9H-carbazole)), and TXO-PhCz (2-(9-phenyl-9H-carbazole-3-yl)-9H-thioxanthene-9-one 10,10-dioxide).

[0279] The specific material meets the aforementioned basic requirements, namely ΔE ST Considering that the value is less than 0.4 eV, exemplarily, all of the aforementioned groups of TADF molecules are suitable TADF material E for use in the present invention. B We can provide this.

[0280] Those skilled in the art will see that, in addition to the named structure, a greater number of materials are suitable TADF material E in the context of the present invention. BIt is known that this is the case. Those skilled in the art are familiar with the design principles of such molecules and also know how to design such molecules having a specific emission hue (e.g., blue, green, or red emission).

[0281] Other contributions include: H. Tanaka, K. Shizu, H. Nakanotani, C. Adachi, Chemistry of Materials 2013, 25(18), 3766, DOI: 10.1021 / cm402428a; Advanced Materials 2013, 25(24), 3319, Advanced Materials 2013, 25(24), 3319; Nasu K., Nakagawa T., Nomura H., Lin C.-J., Cheng C.-H., Tseng M.-R., Yasudad T., Adachi C., Chemical Communications 2013, 49(88), 10385, DOI: 10.1039 / c3cc44179b; Nature Photonics 2014, 8(4), 326, DOI: 10.1038 / nphoton.2014.12; B.Wex, BRKafarani, Journal of Materials Chemistry C 2017, 5, 8622, DOI: 10.1039 / c7tc02156a; Chemistry of Materials 2017, 29(5), 1946, DOI: 10.1021 / acs.chemmater.6b05324; 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.

[0282] Furthermore, 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 elements according to the present invention. B This is disclosed. This is understood not to mean that the present invention is limited to organic electroluminescent elements comprising TADF materials disclosed in the cited references. Any TADF material used is suitable in the context of the present invention. B It is understood that this is the case.

[0283] 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 selectively substituted 1,3,5-triazinyl groups.

[0284] 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 selectively substituted 1,3,5-triazinyl groups.

[0285] In one embodiment of the present invention, each TADF material E B It contains one or more selectively substituted 1,3,5-triazinyl groups.

[0286] In one embodiment of the present invention, each TADF material E BIt comprises one or more chemical moieties independently selected from amino groups, indolyl groups, carbazolyl groups and their derivatives, each of which is selectively substituted, where these groups are bonded to the core structure of each TADF molecule via a nitrogen (N) or carbon (C) atom, and the substituents bonded to these groups can form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems.

[0287] In a preferred embodiment of the present invention, at least one, preferably each, TADF material E B This includes: A first chemical moiety is independently selected from amino groups, indolyl groups, carbazolyl groups and their derivatives, and each is selectively substituted, where the groups are bonded to the core structure of the respective TADF molecule via a nitrogen (N) or carbon (C) atom, and the substituents bonded to these groups can form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, and One or more second chemical moieties independently selected from the group consisting of CN, CF3, and selectively substituted 1,3,5-triazinyl groups.

[0288] In a more preferred embodiment of the present invention, at least one, preferably each, TADF material E B This includes: A first chemical moiety is independently selected from amino groups, indolyl groups, carbazolyl groups and their derivatives, and each is selectively substituted, where the groups are bonded to the core structure of the respective TADF molecule via a nitrogen (N) or carbon (C) atom, and the substituents bonded to these groups can form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, and One or more second chemical moieties independently selected from the group consisting of CN, CF3, and selectively substituted 1,3,5-triazinyl groups.

[0289] In a more preferred embodiment of the present invention, at least one, preferably each, TADF material E B This includes: A first chemical moiety is independently selected from amino groups, indolyl groups, carbazolyl groups and their derivatives, and each is selectively substituted, where the groups are bonded to the core structure of the respective TADF molecule via a nitrogen (N) or carbon (C) atom, and the substituents bonded to these groups can form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, and One or more selectively substituted 1,3,5-triazinyl groups.

[0290] Those skilled in the art understand that the expression "derivative" means that either the respective parent structure is arbitrarily substituted, or any atom within the respective parent structure is replaced, for example, with an atom of another element.

[0291] In one embodiment of the present invention, the organic electroluminescent element includes at least one light-emitting layer B comprising the following: (i) Lowest excited singlet state energy level E(S1 H ) and the lowest excited triplet state energy level E(T1 H ) at least one host material H B , (ii) Lowest excited singlet state energy level E(S1 P ) and the lowest excited triplet state energy level E(T1 P ) at least one phosphorescent material P B , (iii) Lowest excited singlet state energy level E(S1 S ) and the lowest excited triplet state energy level E(T1 S A small FWHM emitter S that has ) and emits light having a FWHM of 0.25 eV or less B , and (iv) Lowest excited singlet state energy level E(S1 E) and the lowest excited triplet state energy level E(T1 E ) at least one thermally activated delayed fluorescence (TADF) material E B , Here, the relationships expressed by equations (1) and (2) below apply, E(T1 H )>E(T1 P ) (1) E(T1 P )>E(S1 S ) (2) Each TADF material E B This includes: A first chemical moiety is independently selected from amino groups, indolyl groups, carbazolyl groups and their derivatives, and each is selectively substituted, where the groups are bonded to the core structure of the respective TADF molecule via a nitrogen (N) or carbon (C) atom, and the substituents bonded to these groups can form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, and One or more second chemical moieties independently selected from the group consisting of CN and selectively substituted 1,3,5-triazinyl groups.

[0292] In one embodiment of the present invention, each TADF material E B This includes: Each contains or consists of one or more first chemical parts with the structure represented by the chemical formula DI, [ka] ...Chemical formula DI Selectively, one or more second chemical moieties are independently selected from CN, CF3, and any one of the structures of chemical formulas AI, A-II, A-III, and A-IV, and [ka] ...Chemical formula AI [ka] ...Chemical formula A-II [ka] ...Chemical formula A-III [ka] ...Chemical formula A-IV A structure containing or composed of one of the following chemical formulas: LI, L-II, L-III, L-IV, LV, L-VI, L-VII, and L-VIII, [ka] ...Chemical formula LI [ka] ...Chemical formula L-II [ka] ...Chemical formula L-III [ka] ...Chemical formula L-IV [ka] ...chemical formula LV [ka] ...Chemical formula L-VI [ka] ...Chemical formula L-VII [ka] ...Chemical formula L-VIII Here, One or more first chemical parts and one or more second chemical parts are covalently bonded to the third chemical part via single bonds. In the chemical formula DI, # indicates the bond position of the single bond connecting the first chemical part to the third chemical part according to the chemical formula DI. Z 2 In each case, they are independent of each other, directly coupled, 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, R a , R b , R d , R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 3 )2, OR 3 , Si(R 3 )3, B(OR 3 )2, OSO2R 3 ,CF3,CN,F,Cl,Br,I, C1-C 40 Alkyl, This is because it has one or more substituents R 3 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 CONR3 It is selectively replaced by, C1-C 40 Alkoxy, This is because it has one or more substituents R 3 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Thioalkoxy, This is because it has one or more substituents R 3 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkenil, This is because it has one or more substituents R 3 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkinil, This is because it has one or more substituents R 3 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R 3 It is selectively replaced by and C3-C 60 Heteroaryl, This is because it has one or more substituents R 3 It is selectively replaced by, R 3 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 4 )2, OR 4 , Si(R 4 )3, B(OR 4 )2, OSO2R 4 CF3, CN, F, Br, I, C1-C 40 Alkyl, This is because it has one or more substituents R 4 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Alkoxy, This is because it has one or more substituents R 4 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Thioalkoxy, This is because it has one or more substituents R 4 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkenil, This is because it has one or more substituents R 4 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkinil, This is because it has one or more substituents R 4 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R 4 It is selectively replaced by and C3-C 57 Heteroaryl, This is because it has one or more substituents R 4 It is selectively replaced by, Here, selectively, any substituent R a , R b , R d , R 1 , R 2 , R 3 and R 4 These are, R, independent of each other. a , R b , R d , R 1 , R 2 , R 3 and R 4 Together with one or more adjacent substituents selected from, they form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-condensed ring systems, and selectively the ring systems thus formed are one or more substituents R 5 It is selectively replaced by, R 4 and R 5 Each of these is independently selected from the following groups: Hydrogen, deuterium, OPh, CF3, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently of each other, such as deuterium, CN, CF3, or Substituted by F, C1-C5 alkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C1-C5 thioalkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C2-C5 alkenyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C2-C5 alkynyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, C1-C5 alkyl, Ph, or CN. C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, Ph, or C1-C5 alkyl. N(C6-C 18 Ariel) 2, N(C3-C 17 Heteroaryl)2, and N(C3-C 17 (Heteroaryl)(C6-C 18 Ariel), a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. In chemical formulas AI, A-II, A-III, and A-IV, The dotted lines indicate single bonds connecting the second chemical part of each chemical formula, AI, A-II, A-III, or A-IV, to the third chemical part. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1 If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other. 6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 9 )2, OR 9 , Si(R 9 )3, B(OR 9 )2, OSO2R 9 ,CF3,CN,F,Cl,Br,I, C1-C 40 Alkyl, This is because it has one or more substituents R 9 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Alkoxy, This is because it has one or more substituents R 9 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Thioalkoxy, This is because it has one or more substituents R 9 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkenil, This is because it has one or more substituents R 9 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkinil, This is because it has one or more substituents R 9 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R 9 It is selectively replaced by and C3-C 60 Heteroaryl, This is because it has one or more substituents R 9 It is selectively replaced by, R 9 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 10 )2, OR 10 , Si(R 10 )3, B(OR 10 )2, OSO2R 10 ,CF3,CN,F,Cl,Br,I, C1-C 40 Alkyl, This is because it has one or more substituents R 10 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Alkoxy, This is because it has one or more substituents R 10 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Thioalkoxy, This is because it has one or more substituents R 10 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkenil, This is because it has one or more substituents R 10 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkinil, This is because it has one or more substituents R 10 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R 10 It is selectively replaced by and C3-C 60 Heteroaryl, This is because it has one or more substituents R 10 It is selectively replaced by, R 10 Each of these is independently selected from the following groups: Hydrogen, deuterium, OPh, CF3, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C1-C5 alkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C1-C5 thioalkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C2-C5 alkenyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C2-C5 alkynyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, C1-C5 alkyl, Ph, or CN. C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, Ph, or C1-C5 alkyl. N(C6-C 18 Ariel) 2, N(C3-C 17 Heteroaryl)2, and N(C3-C 17 (Heteroaryl)(C6-C 18 Ariel), R 7 In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I

[0293] Here, R X R 6 It is defined as follows, however, in chemical formula EWG-I, at least one R X The base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which is condensed into a structure of chemical formula A-IV, with one or more substituents R 10 It is selectively replaced by Here, the fused ring system selectively formed in this way contains a total of 9 to 18 ring atoms. In the chemical formulas LI, L-II, L-III, L-IV, LV, L-VI, L-VII and L-VIII, Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, provided that there is at least one Q 3 It is nitrogen (N), R 11In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, F, Cl, Br, I, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively substituted with deuterium. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently of each other: deuterium, C1-C5 alkyl, C6-C 18 Substituted with aryl groups, F, Cl, Br and I, R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical parts bonded to the third chemical part is the number of available bond positions in the third chemical part (i.e., R 11 The number of each TADF material E is limited only by the aforementioned provisions. B It comprises at least one first chemical part, at least one second chemical part, and exactly one third chemical part.

[0294] In a preferred embodiment of the present invention, Z 2 In each case, they are independent of each other, directly coupled, 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, R a , R b , R d , R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 3 )2, OR 3 , Si(R 3)3, CF3, CN, F, Cl, Br, I, C1-C 40 Alkyl, This is because it has one or more substituents R 3 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R 3 It is selectively replaced by and C3-C 60 Heteroaryl, This is because it has one or more substituents R 3 It is selectively replaced by, R 3 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 4 )2, OR 4 , Si(R 4 )3, CF3, CN, F, Br, I, C1-C 40 Alkyl, This is because it has one or more substituents R 4 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C60 Ariel, This is because it has one or more substituents R 4 It is selectively replaced by and C3-C 57 Heteroaryl, This is because it has one or more substituents R 4 It is selectively replaced by, Here, selectively, substituent R a , R b , R d , R 1 , R 2 , R 3 and R 4 any of the Or one is R, independently of each other. a , R b , R d , R 1 , R 2 , R 3 and R 4 Select from Together with one or more adjacent substituents, it forms monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-condensed ring systems, where, selectively, the ring systems thus formed are one or more substituents R 5 It is selectively replaced by, R 4 and R 5 Each of these is independently selected from the following groups: Hydrogen, deuterium, CF3, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, C1-C5 alkyl, Ph, or CN. C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, C1-C5 alkyl, or Ph. N(C6-C 18 Ariel) 2, N(C3-C 17 Heteroaryl)2, and N(C3-C 17 (Heteroaryl)(C6-C 18 Ariel), a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1 If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other. 6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 9 )2, OR 9 , Si(R 9 )3, B(OR 9 )2, OSO2R 9 ,CF3,CN,F,Cl,Br,I, C1-C 40 Alkyl, This is because it has one or more substituents R 9 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R 9 It is selectively replaced by and C3-C 60 Heteroaryl, This is because it has one or more substituents R 9 It is selectively replaced by, R 9 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 10 )2, OR 10 , Si(R 10 )3, B(OR 10 )2, OSO2R 10 ,CF3,CN,F,Cl,Br,I, C1-C 40 Alkyl, This is because it has one or more substituents R 10 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 Selective Replaced with, C6-C 60 Ariel, This is because it has one or more substituents R 10 It is selectively replaced by and C3-C 60 Heteroaryl, This is because it has one or more substituents R 10 It is selectively replaced by, R 10 Each of these is independently selected from the following groups: Hydrogen, deuterium, OPh, CF3, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, C1-C5 alkyl, Ph, or CN. C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, Ph, or C1-C5 alkyl. N(C6-C 18 Ariel) 2, N(C3-C 17 Heteroaryl)2, and N(C3-C 17 (Heteroaryl)(C6-C 18 Ariel), R 7 In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I Here, R X R 6 Defined as follows, however, at least one R X The base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which is condensed into a structure of chemical formula A-IV, with one or more substituents R 10 The rings are selectively substituted, and the fused ring systems thus selectively formed contain a total of 9 to 18 ring atoms. Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, but at least one Q 3 It is nitrogen (N), R 11 In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively substituted with deuterium. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently of each other, consisting of deuterium, C1-C5 alkyl groups and C6-C 18 Substituted with an aryl group, R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical parts bonded to the third chemical part is the third chemical part. The number of bond positions available in the target region (i.e., substituent R 11 The number of TADF materials E is limited only by the number of TADF materials E (preferably, according to the provisions above). B (This includes at least one first chemical part, at least one second chemical part, and exactly one third chemical part).

[0295] In a more preferred embodiment of the present invention, Z 2 In each case, they are independent of each other, directly coupled, 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, R a , R b , Rd , R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 3 )2, OR 3 , Si(R 3 )3, CF3, CN, F, Cl, Br, I, C1-C 40 Alkyl, This is because it has one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 3 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 3 It is selectively replaced by, R 3 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 4 )2, Si(R 4 )3, CF3, CN, F, C1-C5 alkyl, This is because it has one or more substituents R 4 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 4 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 4 It is selectively replaced by, Here, selectively, substituent R a , R b , R d , R 1 , R 2 and R 3 One of these is R, independently of the others. a , R b , R d , R 1 , R 2 and R3 Together with one or more adjacent substituents selected from, a monocyclic or polycyclic, aliphatic or aromatic, carbocyclic or heterocyclic and / or benzo-condensed ring system is formed, where the ring system thus selectively formed is one or more substituents R 5 It is selectively replaced by, R 4 and R 5 Each of these is independently selected from the following groups: Hydrogen, deuterium, CF3, CN, F, Me, i Pr, t Bu, N(Ph)2, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1 If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other. 6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 9 )2, OR 9 , Si(R 9 )3, CF3, CN, F, C1-C5 alkyl, This is because it has one or more substituents R 9 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 9 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 9 It is selectively replaced by, R 9 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 10 )2, OR 10 , Si(R 10 )3, CF3, CN, F, C1-C5 alkyl, This is because it has one or more substituents R 10 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 10 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 10 It is selectively replaced by, R 10 Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, N(Ph)2, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu, Ph, CN, CF3 or F, R 7In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I Here, R X R 6 Defined as follows, however, at least one R X The base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which is condensed into a structure of chemical formula A-IV, with one or more substituents R 10 The rings are selectively substituted, and the fused ring systems thus selectively formed contain a total of 9 to 18 ring atoms. Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, but at least one Q 3 It is nitrogen (N), R 11 In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively substituted with deuterium. C6-C 18 Ariel, This is deuterium, Me, i Pr, t It is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph, R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical moieties bonded to the third chemical moiety is the number of available bonding positions in the third chemical moiety (i.e., substituent R 11 (Number of) Limited by (preferably, according to the provisions above, each TADF material E B (This includes at least one first chemical part, at least one second chemical part, and exactly one third chemical part).

[0296] In a more preferred embodiment of the present invention, Z 2 In each case, they are independent of each other, directly coupled, 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, R a , R b , R d , R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 3 )2, OR 3 , Si(R 3 )3, CF3, CN, C1-C5 alkyl, This is because it has one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 3 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 3 It is selectively replaced by, R 3 Each of these is independently selected from the following groups: Hydrogen, deuterium, CF3, CN, F, Me, i Pr, t Bu, N(Ph)2, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, Here, selectively, any substituent R a , R b , R d , R 1 and R 2 These are, R, independent of each other. a , R b , R d , R 1 and R 2 Together with one or more adjacent substituents selected from, they form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-condensed ring systems, where the ring systems thus selectively formed are hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring system, which is selectively formed in this manner and consists of a structure according to chemical formula D-1 and bonded rings formed by adjacent substituents, contains a total of 13 to 40 ring atoms, preferably 16 to 30 ring atoms. a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1 If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other.6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 9 )2, OR 9 , Si(R 9 )3, CF3, CN, F, C1-C5 alkyl, This is because it has one or more substituents R 9 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 9 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 9 It is selectively replaced by, R 9 Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, N(Ph)2, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu, Ph, CN, CF3 or F, R 7 In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I Here, R X R 6 Defined as follows, however, at least one R XThe base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which condenses into a structure of chemical formula A-IV, with hydrogen, deuterium, and Me. i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring systems selectively formed in this way contain a total of 9 to 18 ring atoms. Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, but at least one Q 3 It is nitrogen (N), R 11 In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, t Bu, and Me, i Pr, t Ph is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph. R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical moieties bonded to the third chemical moiety is the number of available bonding positions in the third chemical moiety (i.e., substituent R 11 The number of each TADF material E is limited only by (preferably, according to the provisions above, each TADF material E B (This includes at least one first chemical part, at least one second chemical part, and exactly one third chemical part).

[0297] In a more preferred embodiment of the present invention, Z 2 In each case, they are independent of each other, directly coupled, 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, R a , R b and R d Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 3 )2, OR 3 , Si(R 3 )3, CF3, CN, Me, i Pr, t Bu, Ph, where one or more hydrogen atoms are selectively and independently of each other, deuterium, Me, i Pr, t Replaced by Bu and Ph, Carbazolyl, where one or more hydrogen atoms are selectively and independently of each other, deuterium, Me, i Pr, t Replaced by Bu and Ph, Triazinyl, where one or more hydrogen atoms are selectively and independently of each other, deuterium, Me, i Pr, t Replaced by Bu and Ph, Pyrimidinyl, where one or more hydrogen atoms are selectively and independently of each other, deuterium, Me, i Pr, t Replaced by Bu and Ph, Pyridinyl, where one or more hydrogen atoms are selectively and independently of each other, deuterium, Me, i Pr, t Replaced by Bu and Ph, R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 3 )2, OR 3 , Si(R 3 )3, CF3, CN, C1-C5 alkyl, This is because it has one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 3 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 3 It is selectively replaced by, R 3 Each of these is independently selected from the following groups: Hydrogen, deuterium, CF3, CN, F, Me, i Pr, t Bu, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, Here, selectively, any substituent R a , R b , R d , R 1 and R 2 These are, R, independent of each other. a , R b , R d , R 1 and R 2 Together with one or more adjacent substituents selected from, form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-condensed ring systems. Here, the ring system selectively formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, a fused ring system consisting of a structure by chemical formula D1, selectively formed in this manner, and bonded rings formed by adjacent substituents, comprising a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms, a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1 If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other. 6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 9 )2, OR 9 , Si(R 9 )3, CF3, CN, F, C1-C5 alkyl, This is because it has one or more substituents R 9 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 9 It is selectively replaced by and C3-C 17 Heteroaryl, This is because it has one or more substituents R 9 It is selectively replaced by, R 9 Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, N(Ph)2, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu, Ph, CN, CF3 or F, R 7 In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I Here, R X R 6 Defined as follows, however, at least one R X The base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which condenses into a structure of chemical formula A-IV, with hydrogen, deuterium, and Me. i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring systems selectively formed in this way contain a total of 9 to 18 ring atoms. Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, but at least one Q 3 It is nitrogen (N), R 11In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, t Bu, and Me, i Pr, t Ph is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph. R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical moieties bonded to the third chemical moiety is the number of available bonding positions in the third chemical moiety (i.e., substituent R 11 The number of each TADF material E is limited only by (preferably, according to the provisions above, each TADF material E B (This includes at least one first chemical part, at least one second chemical part, and exactly one third chemical part).

[0298] In a more preferred embodiment of the present invention, Z 2 In each case, they are independent of each other, directly coupled, 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, R a , R b and R d Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 3 )2, OR 3 , Si(R 3 )3, CF3, CN, Me, i Pr, t Bu, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph substituted with Bu and Ph, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Carbazolyl substituted with Bu and Ph, R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, OR 3 , Si(R 3 )3, C1-C5 alkyl, This is because it has one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is because it has one or more substituents R 3 It is selectively replaced by, R 3 Each of these is independently selected from the following groups: Hydrogen, deuterium, CF3, CN, F, Me, i Pr, t Bu, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, Here, selectively, any substituent R a , R b , R d , R 1 and R 2 These are, R, independent of each other. a , R b , R d , R 1 and R 2 Together with one or more adjacent substituents selected from, form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-condensed ring systems. Here, the ring system selectively formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, tSelectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring system, which is selectively formed in this manner and consists of a structure according to chemical formula D1 and bonded rings formed by adjacent substituents, contains a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms. a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1 If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other. 6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, OPh, N(Ph)2, Si(Me)3, Si(Ph)3, CF3, CN, F, Me, i Pr, t Bu, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph substituted with Bu and Ph, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Carbazolyl substituted with Bu and Ph, R 7 In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I Here, R X R 6 Defined as follows, however, at least one R X The base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which condenses into a structure of chemical formula A-IV, with hydrogen, deuterium, and Me. i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring systems selectively formed in this way contain a total of 9 to 18 ring atoms. Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, but at least one Q 3 It is nitrogen (N), R 11 In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, t Bu, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, tPh is replaced by Bu and Ph. R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical moieties bonded to the third chemical moiety is the number of available bonding positions in the third chemical moiety (i.e., substituent R 11 The number of each TADF material E is limited only by (preferably, according to the provisions above, each TADF material E B (This includes at least one first chemical part, at least one second chemical part, and exactly one third chemical part).

[0299] In a more preferred embodiment of the present invention, Z 2 In each case, they are independent of each other, directly coupled, 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, R a , R b and R d Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, Si(Me)3, Si(Ph)3, CF3, CN, Me, i Pr, t Bu, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph substituted with Bu and Ph, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Carbazolyl substituted with Bu and Ph, R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, Here, selectively, any substituent R a , R b , R d , R 1 and R 2 They are independent of each other. , R a , R b , R d , R 1 and R 2 Together with one or more adjacent substituents selected from, form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-condensed ring systems. Here, the ring system selectively formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring system, which is selectively formed in this manner and consists of a structure according to chemical formula D1 and bonded rings formed by adjacent substituents, contains a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms. a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other. 6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, Si(Me)3, Si(Ph)3, Me, i Pr, t Bu, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph substituted with Bu and Ph, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Carbazolyl substituted with Bu and Ph, R 7 In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I Here, R X R 6 It is defined as such, but is either CN or CF3, however, it has at least one R X The base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which condenses into a structure of chemical formula A-IV, with hydrogen, deuterium, and Me. i Pr, tBu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring systems selectively formed in this way contain a total of 9 to 18 ring atoms. Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, but at least one Q 3 It is nitrogen (N), R 11 In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, t Bu, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph is replaced by Bu and Ph. R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical moieties bonded to the third chemical moiety is the number of available bonding positions in the third chemical moiety (i.e., substituent R). 11 The number of each TADF material E is limited only by (preferably, according to the provisions above, each TADF material E B (This includes at least one first chemical part, at least one second chemical part, and exactly one third chemical part).

[0300] In a particularly preferred embodiment of the present invention, Z 2 In each case, they are independent of each other, directly coupled, CR 1 R 2 , C=O, NR 1 , O, SiR 1 R 2Selected from the group consisting of S, S(O), and S(O)2, R a , R b and R d Each of these is independently selected from the following groups: Hydrogen, deuterium, CF3, CN, Me, i Pr, t Bu, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, R 1 and R 2 Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, Here, selectively, any substituent R a , R b , R d , R 1 and R 2 These are, R, independent of each other. a , R b , R d , R 1 and R 2 Together with one or more adjacent substituents selected from, form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic and / or benzo-condensed ring systems. Here, the ring system selectively formed in this way consists of hydrogen, deuterium, Me, i Pr, t Bu, CF3, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t It is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph-substituted Ph, Here, the fused ring system, which is selectively formed in this manner and consists of a structure according to chemical formula D1 and rings formed and bonded by adjacent substituents, contains a total of 13 to 30 ring atoms, preferably 16 to 30 ring atoms. a is an integer, and can be 0 or 1. b is an integer, in each case either 0 or 1, where both b are always identical. Here, when integer a is 1, both integers b are 0, and when both integers b are 1, integer a is 0. Q 1 In each case, nitrogen (N) and CR are independent of each other. 6 and CR 7 Selected from, however, in chemical formula AI, two adjacent groups Q 1 Neither of these is nitrogen (N), and here, the base Q of the chemical formula AI. 1 If none of them are nitrogen (N), then group Q 1 At least one of them is CR 7 And, Q 2 In each case, nitrogen (N) and CR are independent of each other. 6 Selected from, provided that in chemical formulas A-II and A-III, at least one group Q 2 It is nitrogen (N), and two adjacent groups Q 2 Both are not nitrogen (N), R 6 and R 8 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, Me, i Pr, t Bu, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph replaced by Bu and Ph, Carbazolyl, where one or more hydrogen atoms are selectively and independently of each other, deuterium, Me, i Pr, t Replaced by Bu and Ph, R 7In each case, the following are independently selected from the group consisting of CN, CF3, and structures with chemical formula EWG-I: [ka] ...Chemical formula EWG-I Here, R X R 6 It is defined as such, but is either CN or CF3, however, it has at least one R X The base is CN or CF3, Here, in chemical formulas A-IV, two adjacent groups R 8 It selectively forms an aromatic ring, which condenses into a structure of chemical formula A-IV, with hydrogen, deuterium, and Me. i Pr, t Bu, CF3, CN, F, and one or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Selectively substituted with one or more substituents independently selected from the group consisting of Bu, Ph, CN, CF3, or Ph substituted with F, Here, the fused ring systems selectively formed in this way contain a total of 9 to 18 ring atoms. Q 3 In each case, nitrogen (N) and CR are independent of each other. 12 Selected from, but at least one Q 3 It is nitrogen (N), R 11 In each case, these are either bond positions of single bonds that independently connect the first or second chemical part to the third chemical part, or are independently selected from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, t Bu, and One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Ph is replaced by Bu and Ph. R 12 R 6 It is defined as follows: Here, the maximum number of first and second chemical moieties bonded to the third chemical moiety is the number of available bonding positions in the third chemical moiety (i.e., substituent R 11 The number of each TADF material E is limited only by (preferably, according to the provisions above, each TADF material E B (This includes at least one first chemical part, at least one second chemical part, and exactly one third chemical part).

[0301] In a preferred embodiment of the present invention, a is always 1 and b is always 0.

[0302] In a preferred embodiment of the present invention, Z 2 In each case, it is a direct join.

[0303] In a preferred embodiment of the present invention, R a In each case, it is hydrogen.

[0304] In a preferred embodiment of the present invention, R a and R d In each case, it is hydrogen.

[0305] In a preferred embodiment of the present invention, Q 3 In each case, it is nitrogen (N).

[0306] In one embodiment of the present invention, in the chemical formula EWG-I, at least one group R X is CN.

[0307] In a preferred embodiment of the present invention, in the chemical formula EWG-I, exactly one group R X is CN.

[0308] In a preferred embodiment of the present invention, in the chemical formula EWG-I, exactly one R X The group is CN, and in the chemical formula EWG-I, R X The base is not CF3.

[0309] Examples of the first chemical part of the present invention are shown below, but this does not mean that the present invention is limited to these examples: [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] Here, the aforementioned definition applies.

[0310] Examples of the second chemical part of the present invention are shown below, but this does not mean that the present invention is limited to these examples: [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] Here, the aforementioned definition applies.

[0311] In a preferred embodiment of the present invention, each TADF material E B is the chemical formula E B -I, E B -NO B -III, E B -IV, E B -V, E B -Work, E B -Work I, E B -VIII, E B -IX, E B -X and E B -Having a structure represented by any one of XI: [ka] ...Chemical formula E B -I [ka] ...Chemical formula E B -II [ka] ...Chemical formula E B -III [ka] ...Chemical formula E B -IV [ka] ...Chemical formula E B -V [ka] ...Chemical formula E B -VI [ka] ...Chemical formula E B -VII [ka] ...Chemical formula E B -VIII [ka] ...Chemical formula E B -IX [ka] ...Chemical formula E B -X [ka] ...Chemical formula E B -XI Here, R 13 R 11 It is defined as follows, however, R 13 This is not a single bond position that connects the first or second chemical part to the third chemical part, R Y The is selected from CN and CF3, or R Y It contains or is composed of the structure shown in the following chemical formula BN-I: [ka] ...Chemical formula BN-I This is due to a single bond represented by a dotted line, resulting in the chemical formula E B -I, E B -NO B -III, E B -IV, E B -V, E B -Work, E B -Work I, E B -VIII or E B - The structure is coupled to IX, where exactly one R BN The base is CN, and the other two R BNThe base is hydrogen (H) in both cases. The definitions mentioned above apply to all other cases.

[0312] In a preferred embodiment of the present invention, R 13 In each case, it is hydrogen.

[0313] In one embodiment of the present invention, R Y In each case, it is CN.

[0314] In one embodiment of the present invention, R Y In each case, it is CF3.

[0315] In one embodiment of the present invention, R Y In each case, the structure is represented by the chemical formula BN-I. It is made.

[0316] In a preferred embodiment of the present invention, R Y In each case, the structures are selected independently from those represented by CN and the chemical formula BN-I.

[0317] In a preferred embodiment of the present invention, each TADF material E B This is the chemical formula E to which the aforementioned definition applies. B -I, E B -NO B -III, E B -IV, E B -V, E B -Work, E B -Work I and E B -It has a structure that can be represented by any one of the following X.

[0318] In a preferred embodiment of the present invention, each TADF material E B This is the chemical formula E to which the aforementioned definition applies. B -I, E B -NO B -III, E B -V and E B -It has a structure that can be represented by any one of the following X.

[0319] TADF material E for use in an organic electroluminescent device according to the present invention B Examples are shown below, but this means only the examples shown are suitable TADF materials in the context of the present invention B and does not mean that.

[0320] Chemical formula E B TADF material E according to -I B Non-limiting examples are shown below: [Chemical formula] [Chemical formula] [Chemical formula] [Chemical formula] [Chemical formula] [Chemical formula] [Chemical formula] ' [[ID=--8]] ' [Chemical formula] [Chemical formula] ' ' ' ' '

[0321] ' ' Chemical formula E B TADF material E according to -II B Non-limiting examples are shown below: [Chemical formula] [ka] [ka] [ka] [ka]

[0322] Chemical formula E B -III TADF material E B A non-restrictive example is shown below: [ka] [ka] [ka] [ka]

[0323] Chemical formula E B - TADF material E by IV B A non-restrictive example is shown below: [ka]

[0324] Chemical formula E B -V TADF material E B A non-restrictive example is shown below: [ka]

[0325] Chemical formula E B -VI-based TADF material E B A non-restrictive example is shown below: [ka]

[0326] Chemical formula E B -VII TADF material E B A non-restrictive example is shown below: [ka]

[0327] Chemical formula E B -TADF material E by VIII B A non-restrictive example is shown below: [ka]

[0328] Chemical formula E B - TADF material E by IX B A non-restrictive example is shown below: [ka] [ka]

[0329] Chemical formula E B -X-based TADF material E B A non-restrictive example is shown below: [ka] [ka]

[0330] Chemical formula E B - TADF material E by XI B A non-restrictive example is shown below: [ka]

[0331] TADF material E B The synthesis of is achieved via standard reactions and reaction conditions well known to those skilled in the art. Generally, in the first step, a coupling reaction, preferably a palladium-catalyzed coupling reaction, is carried out to form chemical formula E B -III, E B -IV and E B -TADF material E using one of the following: B The following is an example illustrating the synthesis of: [ka]

[0332] E1 is any boronic acid (R B =H) or the corresponding boronic acid ester (R B = alkyl or aryl), and in particular, two R B This forms a ring, and for example, pinacol boronic acid ester can be provided. E2 is used as the second reactant, where Hal represents a halogen, which can be I, Br or Cl, but preferably Br. The reaction conditions for the palladium-catalyzed coupling reaction are known to those skilled in the art, for example, from WO2017 / 005699, and it is known that the reactants E1 and E2 are interchangeable as shown below to optimize the reaction yield: [ka]

[0333] In the second step, a TADF molecule is obtained via the reaction of a nitrogen heterocycle in a nucleophilic aromatic substitution with an aryl halide, preferably an aryl fluoride E3. Typical conditions include the use of a base such as tripotassium phosphate or sodium hydride in an aprotic polar solvent such as dimethyl sulfoxide (DMSO) or N,N-dimethylformamide (DMF). [ka]

[0334] 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 These are also 8-di-tert-butylcarbazole, 1-substituted carbazoles (e.g., 1-methylcarbazole, 1-phenylcarbazole, 1-tert-butylcarbazole), 2-substituted carbazoles (e.g., 2-methylcarbazole, 2-phenylcarbazole, 2-tert-butylcarbazole), or 3-substituted carbazoles (e.g., 3-methylcarbazole, 3-phenylcarbazole, 3-tert-butylcarbazole).

[0335] As an alternative, halogen-substituted carbazoles, particularly 3-bromocarbazole, can also be used as E4.

[0336] In subsequent reactions, the boronic acid ester group or boronic acid group is exemplary introduced at the position of one or more halogen substituents introduced via E4, and the corresponding carbazole-3-yl-boronic acid ester or carbazole-3-yl-boronic acid is produced, for example, through a reaction with (pinacolate)diborone (CAS No. 73183-34-3). This can be done. Then, the corresponding halogenated reactant, for example, R a -Hal, preferably , R a -Cl and R a - Through a coupling reaction with Br, one or more substituents R are added in place of the boronic acid ester group or boronic acid group. a , R b or R d It can be implemented.

[0337] As an alternative, substituent R a [R a -B(OH)2], R b [R b -B(OH)2] or R d [R d One or more substituents R are introduced via DH at the position of one or more halogen substituents through the reaction of -B(OH)2] with a boronic acid or corresponding boronic acid ester. a , R b or R d It can be implemented.

[0338] Also, TADF material E B It can be obtained similarly. Also, TADF material E B This can be obtained by any alternative synthesis route suitable for the purpose.

[0339] An alternative synthetic route also involves introducing a nitrogen heterocycle into an aryl halide or aryl pseudohalide, preferably an aryl bromide, aryl iodide, aryl triflate, or aryl tosylate, via copper or palladium-catalyzed coupling.

[0340] Phosphorescent material P B In the context of the present invention, phosphorescent material P B To obtain luminescence from the triplet state, this method utilizes intramolecular spin-orbit interaction (heavy atom effect) induced by metal atoms.

[0341] Generally, it is understood that all phosphorescent complexes used in organic electroluminescent elements in the latest technology can also be used in organic electroluminescent elements according to the present invention.

[0342] Phosphorescent material P used in organic electroluminescent elements B It is common knowledge to those skilled in the art that, in the context of this invention, the phosphorescent material is a complex of Ir, Pt, Pt, Au, Os, Eu, Ru, Re, Ag, and Cu, preferably Ir, Pt, and Pd, and more preferably Ir and Pt. Those skilled in the art know which materials are suitable as phosphorescent materials in organic electroluminescent devices and how to synthesize them. Furthermore, those skilled in the art are familiar with the design principles of phosphorescent complexes for use in organic electroluminescent devices and know how to adjust the luminescence of the complex by structural changes.

[0343] See the following examples: 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; ARBMYusoff, AJHuckaba, MKNazeeruddin, 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.

[0344] For example, US2020274081(A1), US20010019782(A1), US20020034656(A1), US20030138657(A1), US2005123791(A1), US20060065890(A1), US20060134462(A1), US20070034863(A1), US20070111026(A1), US2007034863(A1), US2007138437(A1), U S20080020237(A1), US20080297033(A1), US2008210930(A1), US20090115322(A1), US2009104472(A1), US20100244004 (A1), US2010105902(A1), US20110057559(A1), US2011215710(A1), US2012292601(A1), US2013165653(A1), US2014024 6656(A1), US20030068526(A1), US20050123788(A1), US2005260449(A1), US20060127696(A1), US20060202194(A1), U S20070087321(A1), US20070190359(A1), US2007104979(A1), US2007224450(A1), US20080233410(A1), US200805851( A1), US20090039776(A1), US20090179555(A1), US20100090591(A1), US20100295032(A1), US20030072964(A1), US200 50244673(A1), US20060008670(A1), US20060134459(A1), US20060251923(A1), US20070103060(A1), US20070231600( A1), US2007104980(A1), US2007278936(A1), US20080261076(A1), US2008161567(A1), US20090108737(A1), US200908 5476(A1), US20100148663(A1), US2010102716(A1), US2010270916(A1), US20110204333(A1), US2011285275(A1), US2 013033172(A1), US2013334521(A1), US2014103305(A1), US2003068536(A1), US2003085646(A1), US2006228581(A1), US2006197077(A1), US2011114922(A1), US2011114922(A1), US2003054198(A1), and EP2730583(A1) are phosphorescent materials P in the context of the present invention. B Phosphorescent materials that can be used are disclosed. It is understood that this does not mean that the present invention is limited to organic electroluminescent elements that include phosphorescent materials described in one of the named reference documents.

[0345] As indicated in US2020274081(A1), examples of phosphorescent complexes for use in organic electroluminescent devices such as those of the present invention include the complexes listed below. Again, it should be understood that the present invention is not limited to these examples.

[0346] [ka] [ka] JPEG0007894358000136.jpg214143 [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0347] As mentioned above, those skilled in the art will see that any phosphorescent complex used in the latest technology is a phosphorescent material P in the context of the present invention. BIt can be recognized that it is suitable for this purpose.

[0348] In one embodiment of the present invention, each phosphorescent material P B It contains iridium (Ir).

[0349] In one embodiment of the present invention, at least one phosphorescent material P B Preferably, each phosphorescent material P B It is an organometallic complex containing iridium (Ir) or platinum (Pt).

[0350] In one embodiment of the present invention, at least one phosphorescent material P B Preferably, each phosphorescent material P B It is an organometallic complex containing iridium (Ir).

[0351] In one embodiment of the present invention, at least one phosphorescent material P B Preferably, each phosphorescent material P B It is an organometallic complex containing platinum (Pt).

[0352] Also, phosphorescent material P B A non-restrictive example is the following general chemical formula P B Includes compounds represented by -I: [ka] ...Chemical formula P B -I .

[0353] Chemical formula P B In -I, M is selected from the group consisting of Ir, Pt, Pd, Au, Eu, Ru, Re, Ag, and Cu. n is an integer from 1 to 3. X 2 and Y 1 In each case, they independently form bidentate monoanionic ligands.

[0354] In one embodiment of the present invention, each phosphorescent material P B The chemical formula P is as follows: B -Includes or is composed of a structure by -I: [ka] ...Chemical formula P B -I Here, M is selected from the group consisting of Ir, Pt, Pd, Au, Eu, Ru, Re, Ag, and Cu. n is an integer from 1 to 3. X 2 and Y 1 In each case, they independently form bidentate monoanionic ligands.

[0355] Chemical formula P B Examples of compounds represented by -I are shown below in the general chemical formula P B -II or general chemical formula P B Includes compounds represented by -III: [ka] ...Chemical formula P B -II [ka] ...Chemical formula P B -III Chemical formula P B -II and P B In -III, X' is an aromatic ring bonded to M by a carbon (C) bond, and Y' is a ring that forms a ring by being coordinated to M by a nitrogen (N) bond.

[0356] X' and Y' can bond together, and X' and Y' can form a new ring. Chemical formula P B -III, Z 3 P is a bidentate ligand containing two oxygen (O) atoms. Its chemical formula is P. B -II and P BIn -III, M is preferably Ir from the viewpoint of high efficiency and long lifespan.

[0357] 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 Aaryl, more preferably C6-C 12 Aryl, particularly preferably C6-C 10 It is an aryl molecule, where X' is one or more substituents R in each case, which are selectively present. E It will be replaced by this.

[0358] 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 Heteroaryl, particularly preferably C2-C 10 It is a heteroaryl compound, where Y' is selectively one or more substituents R in each case. E It is replaced by, for example, one or more substituents R. E Replaced by It is also a C1-C5 heteroaryl.

[0359] Chemical formula P B -II and P B -III contains a bidentate ligand Z with two oxygen (O) atoms. 3 For example, a C2-C molecule having two oxygen atoms. 30 Bidentate ligands, preferably C2-C having two oxygen atoms. 25 Bidentate ligands, more preferably C2-C having two oxygen atoms 20 Bidentate ligands, more preferably C2-C having two oxygen atoms. 15 Bidentate ligands, particularly preferably C2-C having two oxygen atoms. 10 It is a bidentate ligand, and here, Z3 In each case, one or more substituents R are selectively selected. E It is replaced by Z. 3 For example, one or more substituents R selectively selected E It is also a C2-C5 bidentate ligand with two oxygen atoms that are substituted.

[0360] R E In each case, the following group is selected independently of each other: Hydrogen, deuterium, N(R) 5E )2, OR 5E , SR 5E , Si(R 5E )3, CF3, CN, halogen, C1-C 40 Alkyl, This is because it has one or more substituents R 5E Selectively substituted, 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 It is selectively replaced by, C1-C 40 Thioalkoxy, This is because it has one or more substituents R 5E Selectively substituted, 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R5E It is selectively replaced by and C3-C 57 Heteroaryl, This is because it has one or more substituents R 5E It is selectively replaced by [this].

[0361] R 5E In each case, the following group is selected independently of each other: Hydrogen, deuterium, N(R) 6E )2, OR 6E , SR 6E , Si(R 6E )3, CF3, CN, F, C1-C 40 Alkyl, This is because it has one or more substituents R 6E Selectively substituted, 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R 6E It is selectively replaced by and C3-C 57 Heteroaryl, This is because it has one or more substituents R 6E It is selectively replaced by [this].

[0362] R 6E In each case, the following group is selected independently of each other: Hydrogen, deuterium, OPh, CF3, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C1-C5 alkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C1-C5 thioalkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C6-C 18 Ariel, This is selectively substituted with one or more C1-C5 alkyl substituents, C3-C 17 Heteroaryl, This is selectively substituted with one or more C1-C5 alkyl substituents, N(C6-C 18 Ariel) 2, N(C3-C 17 Heteroaryl)2, and N(C3-C 17 (Heteroaryl)(C6-C 18 Ariel).

[0363] Substituent R E , R 5E or R 6E R consists of one or more substituents R that are independent of and selectively determined from each other. E , R 5E , R 6E and / or X', Y' and Z 3 Together, they can form monocyclic or polycyclic, aliphatic, aromatic, heteroaromatic, and / or benzo-condensed ring systems.

[0364] Chemical formula P BExamples of compounds represented by -II include Ir(ppy)3, Ir(ppy)2(acac), Ir(mppy)3, Ir(PPy)2(m-bppy), 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)pyridineiridium(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, Ir(phq)2tpy, fac- There are 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.

[0365] Chemical formula P B Other examples of compounds represented by -II are shown below with chemical formula P B -II-1 to P B It contains compounds represented by -II-11. In the structural formula, "Me" represents a methyl group. [ka] [ka] [ka]

[0366] Chemical formula P B Other examples of compounds represented by -III are shown below with chemical formula P B -III-1 to P B It contains compounds represented by -III-6. In the structural formula, "Me" represents a methyl group.

[0367] [ka]

[0368] Additionally, iridium complexes described in US2003017361(A1), US2004262576(A1), WO2010027583(A1), US2019245153(A1), US2013119354(A1), and US2019233451(A1) can be used. From the viewpoint of high efficiency for phosphorescent materials, Ir(ppy)3 and Hex-Ir(ppy)3 are often used for green emission.

[0369] Small FWHM emitter S B The present invention provides a small FWHM emitter S B This also generally refers to any emitter having an emission spectrum with an FWHW of 0.25 eV or less (≤0.25) measured from a spin-coated film having 1 to 5 wt%, particularly 2 wt%, of emitters in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C). As an alternative, a small FWHM emitter S B The emission spectrum is generally observed at room temperature (i.e., approximately 20°C) with 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene. B It can be measured in a solution containing [the specified value].

[0370] In a preferred embodiment of the present invention, a small FWHM emitter S B This is 1 to 5 wt%, especially 2 wt%, of emitter S in PMMA at room temperature. B Any emitter having an emission spectrum exhibiting FWHM of ≤0.24eV, more preferably ≤0.23eV, even more preferably ≤0.22eV, ≤0.21eV, or ≤0.20eV, measured from a spin-coated film having the above characteristics. Alternatively, a small FWHM emitter S B The emission spectrum is generally observed at room temperature (i.e., approximately 20°C) with 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene. BMeasurement can be performed in a solution containing the present invention. B This indicates FWHM for ≤0.19eV, ≤0.18eV, ≤0.17eV, ≤0.16eV, ≤0.15eV, ≤0.14eV, ≤0.13eV, ≤0.12eV, or ≤0.11eV.

[0371] In one embodiment of the present invention, each small FWHM emitter S B This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, it emits light with maximum emission in the wavelength range of 440 nm to 470 nm.

[0372] In one embodiment of the present invention, each small FWHM emitter S B This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, it emits light with maximum emission in the wavelength range of 500 nm to 560 nm.

[0373] In one embodiment of the present invention, each small FWHM emitter S B This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, it emits light with maximum emission in the wavelength range of 610 nm to 665 nm.

[0374] In one embodiment of the present invention, each small FWHM emitter S B This is 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene at room temperature (i.e., (approximately) 20°C). B When measured, it emits maximum emission in the wavelength range of 440 nm to 470 nm.

[0375] In one embodiment of the present invention, each small FWHM emitter S B This is 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene at room temperature (i.e., (approximately) 20°C). BWhen measured, it emits light with maximum emission in the wavelength range of 500 nm to 560 nm.

[0376] In one embodiment of the present invention, each small FWHM emitter S B is room temperature (sand At approximately 20°C, 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene. B When measured, it emits maximum emission in the wavelength range of 610 nm to 665 nm.

[0377] TADF material E included in the light-emitting layer B of the organic electroluminescent element according to the present invention B This is also an emitter having an emission spectrum that selectively exhibits an FWHM of 0.25 eV or less (≤0.25 eV). Selectively, the TADF material E included in the light-emitting layer B of the organic electroluminescent element according to the present invention B Furthermore, it can exhibit maximum emission within the aforementioned wavelength ranges (i.e., 400 nm to 470 nm, 500 nm to 560 nm, and 610 nm to 665 nm).

[0378] In one embodiment of the present invention, one of the relationships represented by the following formulas (23) to (25) applies: 440nm<λ max (S B )<470nm (23) 510nm<λ max (S B )<550nm (24) 610nm<λ max (S B )<665nm (25) Here, .'' max (S B ) is a small FWHM emitter S in the context of the present invention. B This shows the maximum light emission.

[0379] In one embodiment, the aforementioned relationships represented by formulas (23) to (25) apply to the material contained in any one of the at least one light-emitting layer B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (23) to (25) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0380] In a preferred embodiment of the present invention, each small FWHM emitter S B This is an organic emitter, which in the context of the present invention means that it does not contain any transition metals. 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), but may also contain, for example, oxygen (O), silicon (Si), fluorine (F), and bromine (Br).

[0381] In a preferred embodiment of the present invention, a small FWHM emitter S B This is a fluorescent emitter, which, in the context of the present invention, means that the emitter can emit light at room temperature when electronically excited (for example, in the photoelectronic device according to the present invention), and here the luminescence excited state is a singlet state.

[0382] In one embodiment of the present invention, a small FWHM emitter S B This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of 50% or more.

[0383] In a preferred embodiment of the present invention, a small FWHM emitter S B This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of 60% or higher.

[0384] In a more preferred embodiment of the present invention, a small FWHM emitter SB This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of 70% or higher.

[0385] In a more preferred embodiment of the present invention, a small FWHM emitter S B This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, 80% or The photoluminescence quantum yield (PLQY) is shown above.

[0386] In a particularly preferred embodiment of the present invention, a small FWHM emitter S B This is achieved at room temperature with (1 to 5 wt%, especially 2 wt% emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of over 90%.

[0387] In one embodiment of the present invention, a small FWHM emitter S B This is 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene at room temperature (i.e., (approximately) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of 50% or more.

[0388] In a preferred embodiment of the present invention, a small FWHM emitter S B This is 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene at room temperature (i.e., (approximately) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of 60% or higher.

[0389] In a more preferred embodiment of the present invention, a small FWHM emitter S B This is 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene at room temperature (i.e., (approximately) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of over 70%.

[0390] In a more preferred embodiment of the present invention, a small FWHM emitter S B This is 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene at room temperature (i.e., (approximately) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of over 80%.

[0391] In a particularly preferred embodiment of the present invention, a small FWHM emitter S B This is 0.001-0.2 mg / mL of emitter S in dichloromethane or toluene at room temperature (i.e., (approximately) 20°C). B When measured, it exhibits a photoluminescence quantum yield (PLQY) of over 90%.

[0392] Those skilled in the art will find a small FWHM emitter S that meets the aforementioned requirements or preferred characteristics. B I know how to design it.

[0393] Small FWHM emitter S in the context of the present invention B The most suitable molecules for providing this are the well-known 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) materials, whose structural characteristics and applications in organic electroluminescent devices have been studied in detail and are common knowledge to those skilled in the art. Furthermore, the latest technology describes methods for synthesizing such materials and for obtaining emitters having specific emission hues.

[0394] See, for example: J. Liao, Y. Wang, Y. 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.

[0395] Furthermore, those skilled in the art will recognize that the BODIPY basic structure shown below is [ka] For example, we are familiar with the fact that, due to intermolecular π-π interactions and associated self-quenching, organic electroluminescent elements are not ideally suited as emitters.

[0396] It is common knowledge to those skilled in the art that by attaching large-volume groups as substituents to the aforementioned BODIPY core structure, emitter molecules more suitable for organic electroluminescent devices can be obtained. Such large-volume groups may be, for example, aryl, heteroaryl, alkyl, or alkoxy substituents (among many others) or condensed polycyclic or heteroaromatic groups, all of which can be selectively substituted. The selection of suitable substituents in the BODIPY core is obvious to those skilled in the art and can be readily derived from the latest technology. The same is true for the numerous synthetic routes that have been established for the synthesis and subsequent modification of such molecules.

[0397] For example, see: 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.

[0398] Small FWHM emitter S in the context of the present invention B Examples of suitable BODIPY-type emitters are shown below: [ka] [ka] [ka] [ka]

[0399] This is because a BODIPY derivative having different structural characteristics from those described above is a small FWHM emitter S in the context of the present invention. B This is understood not to mean that it is unsuitable. For example, the BODIPY-derived structures or derivatives thereof disclosed in US2020251663(A1), EP3671884(A1), US20160230960(A1), and US20150303378(A1) are suitable for use in small FWHM emitters S according to the present invention. B But so.

[0400] Furthermore, it is known to those skilled in the art that an emitter for an organic electroluminescent device can be reached by replacing one or both of the fluorine substituents bonded to the central boron atom of the BODIPY core structure with an alkoxy or aryloxy group that is selectively substituted with an electron-withdrawing substituent such as fluorine (F) or trifluoromethyl (CF3), via an oxygen atom. Such molecules are disclosed, for example, in US2012037890(A1), and those skilled in the art will know that such BODIPY-related compounds are suitable small FWHM emitters in the context of the present invention. B It is understood that... Examples of such emitter molecules are shown below, and this is because only the structure shown below is suitable for small FWHM emitters S in the context of the present invention. B This does not mean that: [ka]

[0401] Furthermore, the bodily-related boron-containing emitter disclosed in US20190288221(A1) is a small FWHM emitter S suitable for use according to the present invention. B This constitutes a group of emitters that can provide [something].

[0402] Small FWHM emitter S in the context of the present invention B Another type of molecule suitable for providing this is the NRCT (near-range-charge-transfer) emitter.

[0403] Typical NRCT emitters are described in the literature as exhibiting delayed components in time-resolved photoluminescence spectra and showing near-range HOMO-LUMO separation. See 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.

[0404] Typical NRCT emitters exhibit only one emission band in their emission spectrum, while typical fluorescence emitters exhibit multiple unique emission bands due to vibrational progression. It indicates the end.

[0405] Those skilled in the art will understand the context of the present invention, specifically the small FWHM emitter S B Methods for designing and synthesizing NRCT emitters suitable for this purpose are known. For example, the emitter disclosed in EP3109253(A1) is a small FWHM emitter S in the context of the present invention. B It is also used as such.

[0406] 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) are small FWHM emitters S for use according to the present invention. B We disclose an emitter material suitable for this purpose.

[0407] Small FWHM emitter S in the context of the present invention B A group of emitters usable as such are boron (B)-containing emitters containing or composed of the structure shown by the chemical formula DABNA-I below: [ka] ...Chemical formula DABNA-I Here, Each of the rings A', B', and C' independently represents an aromatic or heteroaromatic ring containing 5 to 24 ring atoms, of which, in the case of a heteroaromatic ring, 1 to 3 ring atoms are heteroatoms independently selected from N, O, S, and Se. Here, In each aromatic ring or heteroaromatic ring A', B', and C', one or more hydrogen atoms are selectively and independently substituents R DABNA-1 It is replaced by, which in each case is independently selected from the following group: Deuterium, N(R) 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), C1-C 40 Alkyl, This selectively involves one or more substituents R DABNA-2 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C1-C40 Alkoxy, This selectively involves one or more substituents R DABNA-2 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C1-C 40 Thioalkoxy, This selectively involves one or more substituents R DABNA-2 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C2-C 40 Alkenil, This selectively involves one or more substituents R DABNA-2 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C2-C 40 Alkinil, This selectively involves one or more substituents R DABNA-2 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C6-C 60 Ariel, This selectively involves one or more substituents R DABNA-2 Replaced by, C3-C 57 Heteroaryl, This selectively involves one or more substituents R DABNA-2 Replaced by, and Aliphatic cyclic amines containing 4 to 18 carbon atoms and 1 to 3 nitrogen atoms, R DABNA-2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 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), C1-C5 alkyl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 CONRDABNA-6 Replaced by, C1-C5 alkoxy, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C1-C5 thioalkoxy, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C2-C5 alkenyl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C2-C5 alkynyl, This selectively involves one or more substituents RDABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-6 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-6 Replaced by, and Aliphatic cyclic amines containing 4 to 18 carbon atoms and 1 to 3 nitrogen atoms, Here, R DABNA-1 and R DABNA-2 Two or more adjacent substituents selected from the above selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems fused to adjacent rings A', B', or C', where each selectively formed fused ring system (i.e., each ring A', B', or C' and any additional rings selectively fused to it) contains a total of 8 to 30 ring atoms. Y a and Y b These are independent of each other, directly (single) coupled, NR DABNA-3 O, S, C(R DABNA-3 )2, Si(R DABNA-3 )2, BR DABNA-3 Selected from and Se, R DABNA-3 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) 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), C1-C 40 Alkyl, This selectively involves one or more substituents R DABNA-4 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C1-C 40 Alkoxy, This selectively involves one or more substituents R DABNA-4 Replaced by, Here, one or more non-adjacent CH2 units are R DABNA-4 C=CR DABNA-4 , C≡C, Si(R DABNA-4 )2, Ge(R DABNA-4 )2, Sn(R DABN A-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 by, C1-C 40 Thioalkoxy, This selectively involves one or more substituents R DABNA-4 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C2-C 40 Alkenil, This selectively involves one or more substituents R DABNA-4 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C2-C 40 Alkinil, This selectively involves one or more substituents R DABNA-4 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C6-C 60 Ariel, This selectively involves one or more substituents R DABNA-4 Replaced by, C3-C 57 Heteroaryl, This selectively involves one or more substituents R DABNA-4 Replaced by, and Aliphatic cyclic amines containing 4 to 18 carbon atoms and 1 to 3 nitrogen atoms, R DABNA-4 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-5 )2, OR DABNA-5 , SRDABNA-5 , Si(R DABNA-5 )3, B(OR DABNA-5 )2, OSO2R DABNA-5 CF3, CN, halogen (F, Cl, Br, I), C1-C 40 Alkyl, This selectively involves one or more substituents R DABNA-5 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C1-C 40 Alkoxy, This selectively involves one or more substituents R DABNA-5 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C1-C 40 Thioalkoxy, This selectively involves one or more substituents R DABNA-5 Replaced by, Here, one or more non-adjacent CH2 units are R DABNA-5 C=CR DABNA-5 , C≡C, Si(R DABNA-5 )2, Ge(R DABNA-5 )2, Sn(R DABN A-5 )2, C=O, C=S, C=Se, C=NR DABNA-5 , P(=O)(R DABNA-5 ), O, S or CONR DABNA-5Replaced by, C2-C 40 Alkenil, This selectively involves one or more substituents R DABNA-5 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C2-C 40 Alkinil, This selectively involves one or more substituents R DABNA-5 Replaced by, Here, one or more non-adjacent CH2 units 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 by, C6-C 60 Ariel, This selectively involves one or more substituents R DABNA-5 Replaced by, C3-C 57 Heteroaryl, This selectively involves one or more substituents R DABNA-5 Replaced by, and Aliphatic cyclic amines containing 4 to 18 carbon atoms and 1 to 3 nitrogen atoms, R DABNA-5 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-6 )2, OR DABNA-6 , SR DABNA-6 , Si(R DABNA-6 )3, B(OR DABNA-6 )2, OSO2R DABNA-6CF3, CN, halogen (F, Cl, Br, I), C1-C5 alkyl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C1-C5 alkoxy, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C1-C5 thioalkoxy, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C2-C5 alkenyl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C2-C5 alkynyl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, one or more non-adjacent CH2 groups are selectively 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 by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-6 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-6 Replaced by, and Aliphatic cyclic amines containing 4 to 18 carbon atoms and 1 to 3 nitrogen atoms, Here, R DABNA-3 , R DABNA-4 and R DABNA-5 Two or more adjacent substituents selected from selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, where the selectively formed fused ring systems contain a total of 8 to 30 ring atoms. RDABNA-6 Each of these is independently selected from the following groups: Hydrogen, deuterium, OPh (Ph=phenyl), SPh, CF3, CN, F, Si(C1-C5 alkyl)3, Si(Ph)3, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, Ph, CN, CF3, or F. C1-C5 alkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C1-C5 thioalkoxy, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C2-C5 alkenyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C2-C5 alkynyl, Here, one or more hydrogen atoms are selectively and independently substituted by deuterium, CN, CF3, or F. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently deuterium, CN, CF3, F, C1-C5 alkyl, SiMe3, SiPh3, or C6-C 18 Substituted by aryl substituents, C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently deuterium, CN, CF3, F, C1-C5 alkyl, SiMe3, SiPh3, or C6-C 18 Substituted by aryl substituents, N(C6-C 18 Ariel) 2, N(C3-C 17 Heteroaryl)2, and N(C3-C 17 (Heteroaryl)(C6-C 18 Ariel), Here, Y a and Yb one of the following, or Y a and Y b Both of them are NR DABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2 or BR DABNA-3 If so, the one or two substituents R DABNA-3 These are the adjacent rings A' and B'(Y a =NR DABNA-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 ) directly (single) coupled to one or both of NR, or independently in each case, DABNA-1 O, S, C(R DABNA-1 )2, Si(R DABNA-1 )2, BR DABNA-1 And can be bonded via a linking atom or atomic group selected from Se, Here, two or more structures of the chemical formula DABNA-I are selectively joined to each other, preferably condensed by sharing at least one, more preferably exactly one bond. Here, two or more structures of the chemical formula DABNA-I are selectively present in the emitter, sharing at least one, preferably exactly one aromatic or heteroaromatic ring (i.e., the ring is also part of the two structures of the chemical formula DABNA-I), wherein the ring is preferably one of the rings A', B', and C' of the chemical formula DABNA-I, and also R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 , especially R DABNA-3The covalent ring may be any aromatic substituent or heteroaromatic substituent selected from the above, or any aromatic ring or heteroaromatic ring formed by two or more adjacent substituents as described above, where the covalent ring may constitute identical or distinct parts of two or more structures of the chemical formula DABNA-I that share the ring (i.e., the covalent ring may also be, for example, ring C' of two structures of the chemical formula DABNA-I selectively contained in the emitter, or the covalent ring may also be, for example, ring B' of one structure of the chemical formula DABNA-I and ring C' of the other structure selectively contained in the emitter). Here, selectively select at least one R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 However, this is replaced by a bond to a further chemical entity of the chemical formula DABNA-I, and / or selectively 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 is replaced by a bond to a further chemical entity of the chemical formula DABNA-I.

[0408] 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 contains a structure with the chemical formula DABNA-I.

[0409] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, each small FWHM emitter S B This includes the structure represented by the chemical formula DABNA-I.

[0410] 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 with the chemical formula DABNA-I.

[0411] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, each small FWHM emitter S B It consists of a structure with the chemical formula DABNA-I.

[0412] In a preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B It contains or consists of a structure with the chemical formula DABNA-I, and A', B ' and C' are all aromatic rings (i.e., all benzene rings) each having six ring atoms.

[0413] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I, where Y a and Y b They are independent of each other, NR DABNA-3 O, S, C(R DABNA-3 )2 and Si(R DABNA-3 ) Selected from 2.

[0414] In a preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I, where Y a and Y b They are independent of each other, NR DABNA-3 Selected from O and S.

[0415] In a more preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S BThis includes or is composed of a structure with the chemical formula DABNA-I, where Y a and Y b They are independent of each other, NR DABNA-3 And selected from O.

[0416] In a particularly preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I, where Y a and Y b Both are NR DABNA-3 That is the case.

[0417] In a particularly preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or is composed of a structure with the chemical formula DABNA-I, where Y a and Y b They are identical and independent of each other, and both are NR DABNA-3 That is the case.

[0418] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B It contains or is composed of a structure with the chemical formula DABNA-I. R DABNA-1 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-2 )2, OR DABNA-2 , SR DABNA-2 , Si(R DABNA-2 )3, CF3, CN, F, C1-C5 alkyl, This selectively involves one or more substituents R DABNA-2 Replaced by, C1-C5 alkoxy, This selectively involves one or more substituents R DABNA-2 Replaced by, C1-C5 thioalkoxy, This selectively involves one or more substituents R DABNA-2 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-2 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-2 Replaced by, R DABNA-2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-6 )2, OR DABNA-6 , SR DABNA-6 , Si(R DABNA-6 )3, CF3, CN, F, C1-C5 alkyl, This selectively involves one or more substituents R DABNA-6 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-6 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, R DABNA-1 and R DABNA-2 Two or more adjacent substituents selected from the above selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems fused to adjacent rings A', B', or C', where the selectively formed fused ring systems (i.e., each ring A', B', or C' and the additional rings selectively fused to them) contain a total of 8 to 30 ring atoms.

[0419] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B It contains or is composed of a structure with the chemical formula DABNA-I. R DABNA-1 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-2 )2, OR DABNA-2 , SR DABNA-2 , Si(R DABNA-2 )3, C1-C5 alkyl, This selectively involves one or more substituents R DABNA-2 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-2 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-2 Replaced by, R DABNA-2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-6 )2, OR DABNA-6 , SR DABNA-6 , Si(R DABNA-6 )3, CF3, CN, F, C1-C5 alkyl, This selectively involves one or more substituents R DABNA-6 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-6 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, R DABNA-1 and R DABNA-2Two or more adjacent substituents selected from the above selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems fused to adjacent rings A', B', or C', where the selectively formed fused ring systems (i.e., each ring A', B', or C' and the additional rings selectively fused to them) contain a total of 8 to 30 ring atoms.

[0420] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-1 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-2 )2, OR DABNA-2 , SR DABNA-2 , C1-C5 alkyl, This selectively involves one or more substituents R DABNA-2 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-2 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-2 Replaced by, R DABNA-2 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, OPh, CN, Me, i Pr, t Bu, Si(Me)3, Ph, This selectively involves one or more substituents R DABNA-6 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-6 Replaced by, Here, two or more adjacent R DABNA-1 These rings form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems condensed to adjacent rings A', B', or C', where the selectively formed fused ring systems (i.e., each ring A', B', or C' and the additional rings selectively condensed to them) contain a total of 8 to 30 ring atoms.

[0421] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B It contains or is composed of a structure with the chemical formula DABNA-I. R DABNA-1 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, OPh, Me, i Pr, t Bu, Si(Me)3, Ph, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced with Bu, Ph, or CN C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced with Bu, Ph, or CN Here, two or more adjacent substituents R DABNA-1 The rings selectively condense to adjacent rings A', B', or C' to form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, where the selectively formed fused ring systems (i.e., each ring A', B', or C' and the additional ring selectively condensed to it) contain a total of 8 to 30 ring atoms.

[0422] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B It contains or is composed of a structure with the chemical formula DABNA-I. R DABNA-1 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, Me, i Pr, t Bu, Ph, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced with Bu, Ph, or CN Carbazolyl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced with Bu, Ph, or CN Triazinyl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced with Bu, Ph, or CN Pyrimidinyl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced with Bu, Ph, or CN Pyridinyl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced with Bu, Ph, or CN Here, two or more adjacent substituents R DABNA-1 The rings selectively condense to adjacent rings A', B', or C' to form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, where the selectively formed fused ring systems (i.e., each ring A', B', or C' and the additional ring selectively condensed to it) contain a total of 8 to 30 ring atoms.

[0423] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I, and R DABNA-1 and R DABNA-2 The adjacent substituents selected from do not form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems condensed on the adjacent ring A', B', or C'.

[0424] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-3 Each of these is independently selected from the following groups: Hydrogen, deuterium, C1-C4 alkyl, This selectively involves one or more substituents R DABNA-4 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-4 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-4 Replaced by, R DABNA-4 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) DABNA-5 )2, OR DABNA-5 , SR DABNA-5 Si(C1-C5 alkyl)3, CF3, CN, F, C1-C5 alkyl, This selectively involves one or more substituents R DABNA-5 Replaced by, C6-C 18Ariel, This selectively involves one or more substituents R DABNA-5 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-5 Replaced by, R DABNA-5 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, OPh, Si(Me)3, CF3, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t B Replaced by u, Ph or CN, C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced by Bu, Ph, or CN Here, R DABNA-3 , R DABNA-4 and R DABNA-5 Two or more adjacent substituents selected from the set selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, where the selectively formed fused ring systems contain a total of 8 to 30 ring atoms.

[0425] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-3 Each of these is independently selected from the following groups: Hydrogen, deuterium, C1-C4 alkyl, This selectively involves one or more substituents R DABNA-4 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-4 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-4 Replaced by, R DABNA-4 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(Ph)2, OPh, Si(Me)3, CF3, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced by Bu, Ph, or CN C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced by Bu, Ph, or CN Here, R DABNA-3 and R DABNA-4 Two or more adjacent substituents selected from the set do not form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with respect to each other.

[0426] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-3Each of these is independently selected from the following groups: Hydrogen, deuterium, C1-C4 alkyl, This selectively involves one or more substituents R DABNA-4 Replaced by, C6-C 18 Ariel, This selectively involves one or more substituents R DABNA-4 Replaced by, C3-C 17 Heteroaryl, This selectively involves one or more substituents R DABNA-4 Replaced by, R DABNA-4 Each of these is independently selected from the following groups: Hydrogen, deuterium, CN, F, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced by Bu, Ph, or CN C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced by Bu, Ph, or CN Here, R DABNA-3 and R DABNA-4 Two or more adjacent substituents selected from the set do not form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with respect to each other.

[0427] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. RDABNA-3 Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, and C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced by Bu, Ph, or CN Here, R DABNA-3 Two or more adjacent substituents selected from the set do not form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with respect to each other.

[0428] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-3 Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, i Pr, t Bu, and Ph, Here, one or more hydrogen atoms are selectively and independently of each other, including deuterium, Me, i Pr, t Replaced by Bu, Ph, or CN Here, R DABNA-3 Two or more adjacent substituents selected from the set do not form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with respect to each other.

[0429] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. RDABNA-6 In each case, the following group is selected independently of each other: Hydrogen, deuterium, OPh (Ph=phenyl), SPh, CF3, CN, F, Si(C1-C5 alkyl)3, Si(Ph)3, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, Ph, CN, CF3, or F. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently deuterium, CN, CF3, F, C1-C5 alkyl, SiMe3, SiPh3, or C6-C 18 Replaced with aryl, C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently deuterium, CN, CF3, F, C1-C5 alkyl, SiMe3, SiPh3, or C6-C 18 Replaced with aryl, N(C6-C 18 Ariel) 2, N(C3-C 17 Heteroaryl)2, and N(C3-C 17 (Heteroaryl)(C6-C 18 Ariel).

[0430] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-6 In each case, the following group is selected independently of each other: Hydrogen, deuterium, N(Ph)2, OPh (Ph=phenyl), SPh, CF3, CN, F, Si(Me)3, Si(Ph)3, C1-C5 alkyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, Ph, CN, CF3, or F. C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently deuterium, CN, CF3, F, Me, i Pr, t Replaced with Bu, SiMe3, SiPh3, or Ph, C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently deuterium, CN, CF3, F, Me, i Pr, t It is replaced with Bu, SiMe3, SiPh3, or Ph.

[0431] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-6 In each case, the following group is selected independently of each other: Hydrogen, deuterium, N(Ph)2, CN, F, Me, i Pr, t Bu, Ph, Here, one or more hydrogen atoms are selectively and independently of deuterium, CN, Me, i Pr, t Replaced with Bu or Ph, C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently of deuterium, CN, Me, i Pr, t It will be replaced with Bu or Ph.

[0432] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I. R DABNA-6In each case, the following group is selected independently of each other: Hydrogen, deuterium, Me, i Pr, t Bu, Ph, Here, one or more hydrogen atoms are selectively and independently of deuterium, Me, i Pr, t Replaced by Bu or Ph.

[0433] In one embodiment of the present invention, at least one, preferably each, light-emitting layer B And, preferably, at least one, each of the one or more small FWHM emitters S B It contains or is composed of a structure with the chemical formula DABNA-I. Y a and / or Y b NR DABNA-3 , C(R DABNA-3 )2, Si(R DABNA-3 )2 or BR DABNA-3 If so, one or two substituents R DABNA-3 This 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-3 In the case of 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 ).

[0434] In one embodiment, a small FWHM emitter S in the context of the present invention BThese are selectively polymers (e.g., dimers) of the aforementioned chemical formula DABNA-I, meaning that their structures contain one or more subunits, each having a structure according to the chemical formula DABNA-I. In this case, those skilled in the art will understand that two or more subunits according to the chemical formula DABNA-I may, for example, be conjugable and preferably condensed with one another (i.e., sharing at least one bond, where each substituent bonded to the atom forming that bond may not be any further). Furthermore, two or more subunits may share at least one, preferably exactly one, aromatic ring or heteroaromatic ring. This is, for example, a small FWHM emitter S B This means that each of these contains two or more subunits having the structure of the chemical formula DABNA-I, where the two subunits share one aromatic ring or heteroaromatic ring (i.e., each ring is part of the two subunits). As a result, each of the polymer (e.g., dimer) emitters S B This has a shared ring present only once and does not contain two whole subunits with the chemical formula DABNA-I. Nevertheless, those skilled in the art will understand that in this application, the emitter is still considered a polymer of the chemical formula DABNA-I (for example, a dimer if it contains two subunits having the structure of the chemical formula DABNA-I). The same applies to polymers that share one or more rings. Preferably, the polymer is a dimer containing two subunits, each having the structure of the chemical formula DABNA-I.

[0435] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each small FWHM emitter S B As mentioned above, 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.

[0436] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B It contains or consists of two or more structures (i.e., subunits) with the chemical formula DABNA-I, preferably exactly two. Here, each subunit shares at least one, preferably exactly one, aromatic or heteroaromatic ring (i.e., the ring is also part of the two structures of the chemical formula DABNA-I), where the covalent ring is also one of the rings A', B', and C' of the chemical 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-3 The covalent ring may be any aromatic substituent or heteroaromatic substituent selected from the above, or any aromatic ring or heteroaromatic ring formed by two or more adjacent substituents as described above, where the covalent ring can constitute identical or distinct parts of two or more structures of the chemical formula DABNA-I that share the ring (i.e., the covalent ring may also be, for example, ring C' of two structures of the chemical formula DABNA-I selectively contained in the emitter, or the covalent ring may also be, for example, ring B' of one structure of the chemical formula DABNA-I selectively contained in the emitter and ring C' of the other structure).

[0437] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, in each, one or more small FWHM emitters S B It contains or is composed of two or more structures (i.e., subunits) with the chemical formula DABNA-I, preferably exactly two. Here, R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6At least one of these is replaced by a bond to a further chemical entity of the chemical formula DABNA-I, and / or R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 At least one hydrogen atom in any one of these is replaced by a bond to a further chemical entity of the chemical formula DABNA-I.

[0438] The small FWHM emitter S according to the present invention B A non-limiting example of an emitter containing or composed of a structure with the chemical formula DABNA-I that can be used as follows: [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

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[0439] In one embodiment of the present invention, at least one small FWHM emitter S B This includes the structure represented by the chemical formula BNE-1.

[0440] In one embodiment of the present invention, each small FWHM emitter S B This includes the structure represented by the chemical formula BNE-1.

[0441] In one embodiment of the present invention, at least one small FWHM emitter S B It consists of a structure with the chemical formula BNE-1.

[0442] In one embodiment of the present invention, each small FWHM emitter S B It consists of a structure with the chemical formula BNE-1.

[0443] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or is composed of a structure with the chemical formula BNE-1, where V 1 CR BNE-V V 2 CR BNE-I That is the case.

[0444] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or consists of a structure with the chemical formula BNE-1, where V 1 and V 2 Both are nitrogen (N).

[0445] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes a structure with the chemical formula BNE-1, or from It is composed, and here, V 1 is nitrogen (N), and V 2 CR BNE-I That is the case.

[0446] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or is composed of a structure with the chemical formula BNE-1, where V 1 CR BNE-V V 2 It is nitrogen (N).

[0447] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or consists of a structure with the chemical formula BNE-1, where both c and d are 0.

[0448] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or consists of a structure with the chemical formula BNE-1, where c is 0 and d is 1.

[0449] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or consists of a structure with the chemical formula BNE-1, where c is 1 and d is 0.

[0450] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or consists of a structure with the chemical formula BNE-1, where both c and d are 1.

[0451] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B It contains or is composed of a structure with the chemical formula BNE-1. Here, X 3 This is direct bonding, CR BNE-3 R BNE-4 , C=O, NR BNE-3 O, S, SiR BNE-3 R BNE-4 Selected from the group consisting of, Y 2 This is direct bonding, CR BNE-3’ R BNE-4’ , C=O, NR BNE-3’ O, S, SiR BNE-3’ R BNE-4’ It is selected from the group consisting of the following.

[0452] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B It contains or is composed of a structure with the chemical formula BNE-1. Here, X 3 This is direct bonding, CRBNE-3 R BNE-4 , NR BNE-3 O, S, SiR BNE-3 R BNE-4 Selected from the group consisting of, Y 2 This is direct bonding, CR BNE-3’ R BNE-4’ , NR BNE-3’ O, S, SiR BNE-3’ R BNE-4’ It is selected from the group consisting of the following.

[0453] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B It contains or is composed of a structure with the chemical formula BNE-1. Here, X 3 This is direct bonding, CR BNE-3 R BNE-4 , NR BNE-3 O, S, SiR BNE-3 R BNE-4 Selected from the group consisting of, Y 2 This is a direct bond.

[0454] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B It contains or is composed of a structure with the chemical formula BNE-1. Here, X 3 This is direct coupling or NR BNE-3 And, Y 2 This is a direct bond.

[0455] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or consists of a structure with the chemical formula BNE-1. Here, X 3 , NR BNE-3 And, Y 2 This is a direct bond.

[0456] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B This includes or consists of a structure with the chemical formula BNE-1. 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 selected from the following groups: Hydrogen, deuterium, 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, C1-C 40 Alkyl, This is because it has one or more substituents R BNE-5 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Alkoxy, This is because it has one or more substituents R BNE-5 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Thioalkoxy, This is because it has one or more substituents R BNE-5 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkenil, This is because it has one or more substituents R BNE-5 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C2-C 40 Alkinil, This is because it has one or more substituents R BNE-5 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R BNE-5 It is selectively replaced by and C2-C 57 Heteroaryl, This is because it has one or more substituents R BNE-5 It is selectively replaced by, R BNE-d , R BNE-d’ and R BNE-e They are selected independently from the following groups: Hydrogen, deuterium, CF3, CN, F, Cl, Br, I, C1-C 40 Alkyl, This is because it has one or more substituents R BNE-a It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C6-C 60 Ariel, This is because it has one or more substituents R BNE-a It is selectively replaced by and C2-C 57 Heteroaryl, This is because it has one or more substituents R BNE-a It is selectively replaced by, R BNE-a Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) BNE-5 )2, ORBNE-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, C1-C 40 Alkyl, This is because it has one or more substituents R BNE-5 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Alkoxy, This is because it has one or more substituents R BNE-5 It is selectively replaced by, Here, one or more non-adjacent CH2 units 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 It is selectively replaced by, C1-C 40 Thioalkoxy, This is because it has on...

Claims

1. An organic electroluminescent element comprising at least one light-emitting layer B consisting of one or more sublayers, wherein the one or more sublayers are adjacent to each other and collectively include the following: (i) Lowest excited singlet state energy level E(S1) Ｈ ) and the lowest excited triplet state energy level E(T1 Ｈ ) at least one host material H Ｂ , (ii) Lowest excited singlet state energy level E(S1 Ｐ ) and the lowest excited triplet state energy level E(T1 Ｐ ) at least one phosphorescent material P Ｂ , (iii) At least one small full-width at half-maximum (FWHM) emitter S that has a lowest excited singlet state energy level E(S1 Ｓ ), and a lowest excited triplet state energy level E(T1 Ｓ ), and emits light having a full-width at half-maximum (FWHM) of 0.25 eV or less Ｂ , and selectively (iv) Lowest excited singlet state energy level E(S1) Ｅ ) and the lowest excited triplet state energy level E(T1 Ｅ At least one thermally activated delayed fluorescence (TADF) material E having ) Ｂ , 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 includes at least one material selected from the group consisting of, Here, at least one host material H Ｂ This is an energy E less than -5.60 eV. ＨＯＭＯ (H Ｂ ) has the highest occupied orbit HOMO (H Ｂ ) has, The at least one small FWHM emitter S Ｂ It meets the following requirements: (i) Boron (B)-containing emitters, which are each small FWHM emitters S Ｂ This means that at least one of the atoms inside is boron (B).

2. The organic electroluminescent element according to claim 1, wherein at least one of the one or more sublayers of at least one light-emitting layer B includes the following: (iv) Lowest excited singlet state energy level E(S1) Ｅ ) and the lowest excited triplet state energy level E(T1 Ｅ At least one thermally activated delayed fluorescence (TADF) material E having ) Ｂ .

3. The aforementioned at least one TADF material E B is (i) Lowest excited singlet state energy level E(S1) Ｅ ) and the lowest excited triplet state energy level E(T1 Ｅ ΔE corresponds to the energy difference with ) ＳＴ It is characterized by a value of less than 0.4 eV, (ii) The organic electroluminescent element according to claim 1 or 2, exhibiting a photoluminescence quantum yield (PLQY) greater than 30%.

4. The organic electroluminescent element according to claim 2, to which the relationship represented by the following formulas (1), (2), and (3) applies: E(T1) Ｈ )>E(D1 Ｐ ) (1) E (T1) Ｐ )>E(S1 Ｓ ) (2) E (T1) Ｈ )>E(S1 Ｅ ) (3).

5. At least one sublayer is made of exactly one TADF material E Ｂ and exactly one phosphorescent material P Ｂ An organic electroluminescent element according to any one of claims 1 to 4, comprising

6. One sublayer is exactly one TADF material E Ｂ It includes one sublayer, and each sublayer is exactly one phosphorescent material P Ｂ And exactly one small FWHM emitter S Ｂ An organic electroluminescent element according to any one of claims 1 to 5, including the following:

7. The aforementioned at least one H B includes or consists of the following p-host H Ｐ The organic electroluminescent element according to any one of claims 1 to 6: -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 containing or composed of any one of X, and 【Chemistry 1】 Chemical formula H Ｐ -I 【Chemistry 2】 Chemical formula H Ｐ -II 【Transformation 3】 Chemical formula H Ｐ -III 【Chemistry 4】 Chemical formula H Ｐ -IV 【Transformation 5】 Chemical formula H Ｐ -V 【Transformation 6】 Chemical formula H Ｐ -VI 【Transformation 7】 Chemical formula H Ｐ -VI 【Transformation 8】 Chemical formula H Ｐ -VIII 【Chemistry 9】 Chemical formula H Ｐ -IX 【Chemistry 10】 Chemical formula H Ｐ -X - Each has 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 - A structure comprising any one of XIX, or one or more second chemical parts composed thereof, 【Chemistry 11】 Chemical formula H Ｐ -XI 【Chemistry 12】 Chemical formula H Ｐ -XII 【Chemistry 13】 Chemical formula H Ｐ -XIII 【Chemistry 14】 Chemical formula H Ｐ -XIV 【Chemistry 15】 Chemical formula H Ｐ -XV 【Chemistry 16】 Chemical formula H Ｐ -XVI 【Chemistry 17】 Chemical formula H Ｐ -XVI [Chemistry 18] Chemical formula H Ｐ -XVIII 【Chemistry 19】 Chemical formula H Ｐ -XIX Here, the p-host material H Ｐ Each of the at least one second chemical part present in is connected to the first chemical part via a single bond represented by a dotted line in the chemical formula, Here, Z １ In each case, they are independent of each other, directly bonded, C(R) ＩＩ ) ２ , C = C(R ＩＩ ) ２ C=O, C=NR ＩＩ , NR ＩＩ , O, Si(R ＩＩ ) ２ , S, S(O) and S(O) ２ Selected from the group consisting of, R Ｉ In each case, these are either single bond sites that independently link the first chemical portion to the second chemical portion, or selected from the group consisting of the following: Hydrogen, deuterium, Me, ｉ Pr, ｔ Bu, and Me, ｉ Pr, ｔ Ph is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph. Here, at least one R Ｉ This is a single bond bonding site that connects the first chemical portion to the second chemical portion. R ＩＩ Each of these is independently selected from the following groups: Hydrogen, deuterium, Me, ｉ Pr, ｔ Bu, and Me, ｉ Pr, ｔ Ph is selectively substituted with one or more substituents independently selected from the group consisting of Bu and Ph. Here, two or more adjacent substituents R ＩＩ It selectively forms aliphatic or aromatic, carbocyclic or heterocyclic systems, and has 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 structures consisting of any one of the XIX, but also adjacent substituents R ＩＩ The fused ring system, composed of additional rings selectively formed by this process, contains a total of 3 to 60 carbon atoms.

8. The organic electroluminescent element according to any one of claims 1 to 7 to which the following relationships represented by formulas (3) and (4) apply: E(T1) Ｈ )>E(D1 Ｅ ) (3) E(T1) Ｅ )>E(D1 Ｐ ) (4).

9. (i) The at least one host material H B has energy E ＨＯＭＯ (H Ｂ ) has the highest occupied orbit HOMO (H Ｂ ) has, (ii) The at least one phosphorescent material P B has an energy E ＨＯＭＯ (P Ｂ ) has the highest occupied orbit HOMO (P Ｂ ) has, (iii) The at least one small FWHM emitter S B has energy E ＨＯＭＯ (S Ｂ ) has the highest occupied orbit HOMO (S Ｂ ) has, Herein, the relationship represented by the following formulas (10) and (11) applies to the organic electroluminescent element according to any one of claims 1 to 8: E ＨＯＭＯ (P Ｂ )>E ＨＯＭＯ (H Ｂ ) (10) E ＨＯＭＯ (P Ｂ )>E ＨＯＭＯ (S Ｂ ) (11)。

10. The organic electroluminescent element according to any one of claims 1 to 9 to which the relationship represented by the following formula (4) applies: E(T1) Ｅ )>E(D1 Ｐ ) (4).

11. The at least one small FWHM emitter S Ｂ The organic electroluminescent element according to any one of claims 1 to 10, further satisfying the following requirements: (ii) comprising a polycyclic aromatic or heteroaromatic core structure in which at least two aromatic rings are condensed together.

12. The organic electroluminescent element according to any one of claims 1 to 11, wherein the one or more sublayers collectively include or are composed of the following: (i) 30 to 99.8% by weight of 1 or more host material H Ｂ , (ii) 0.1 to 30% by weight of 1 or more phosphorescent material P Ｂ , (iii) Small FWHM emitter S of 1 or more in weight of 0.1 to 10% Ｂ , and selectively (iv) 0 to 69.8% by weight of 1 or more TADF material E Ｂ , and selectively (v) 0 to 69.8% by weight of one or more solvents.

13. The organic electroluminescent element according to any one of claims 1 to 12, wherein the at least one light-emitting layer B consists of exactly one (sub) layer.

14. A method for generating light, including the following steps: (i) To provide an organic electroluminescent element according to any one of claims 1 to 13, and (ii) Applying an electric current to the organic electroluminescent element.

15. The light generation method according to claim 14, which generates light in a wavelength range selected from one of the following wavelength ranges: (i) 510 nm to 550 nm, (ii) 440 nm to 470 nm, or (iii) 610 nm to 665 nm.

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