Organic electroluminescent element

Abstract

The present invention relates to an organic electroluminescent device comprising one or more emissive layers B, each of which is composed of one or more sublayers, the one or more sublayers being generally composed of one or more excitation energy transfer components EET-1, one or more excitation energy transfer components EET-2, and one or more small FWHM emitters S emitting light with a full width at half maximum (FWHM) of 0.25 eV or less. B The present invention also relates to a method for generating light using the organic electroluminescent device according to the present invention.

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 each of the one or more sublayers of the light-emitting layer B comprises one or more excitation energy transfer components EET-1, one or more excitation energy transfer components EET-2, and one or more small FWHM emitters S that emit light having a full width at half maximum (FWHM) of 0.25 eV or less. B , and selectively one or more host materials H B This invention includes the following. Furthermore, the present invention relates to a light generation method utilizing an organic electroluminescent element according to the present invention. [Overview of the project] [Problems that the invention aims to solve]

[0002] For example, organic electroluminescent devices, such as organic light-emitting diodes (OLEDs), light-emitting electrochemical cells (LECs), and light-emitting transistors, which include one or more light-emitting layers based on organic materials, 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 that are substantially based on inorganic materials, organic electroluminescent devices, which are based on organic materials, can usually be produced in a flexible and especially thin-film form. OLED-based screens and displays already available today 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 upper light-emitting element to modify its cavity and adjust the color coordinates. To achieve high efficiency in the upper light-emitting element while targeting such a color gamut, a narrow emission spectrum is required in the lower light-emitting element.

[0004] The latest phosphorescent emitters exhibit a somewhat broad emission, which is reflected in the broad emission of phosphorescent-based OLEDs (PHOLEDs), which generally have a full width at half maximum (FWHM) of emission spectra greater than 0.25 eV. The broad emission spectrum of the PHOLED in the lower element results in a significant loss of outcoupling efficiency for the upper light-emitting element structure targeting the BT-2020 and DCPI three-color regions.

[0005] Furthermore, phosphorescent materials are typically 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 core performance indicator for pricing OLED application products.

[0006] In recent years, some fluorescent emitters or TADF (thermally-activated-delayed-fluorescence) emitters exhibiting somewhat 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 suffer from short lifetimes due to exciton-polaron annihilation or exciton-exciton annihilation, as well as 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 to transfer 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 cannot provide an organic electroluminescent device that possesses all of the aforementioned desirable characteristics, namely, excellent efficiency, long lifetime, and excellent color purity.

[0008] The central element 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. Typically, the hole transport layer is located (typically) between the light-emitting layer and the positive electrode, and the electron transport layer is usually 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 light emission. [Means for solving the problem]

[0009] Surprisingly, it consists of one or more (sub)layers and, overall, one or more excitation energy transfer components EET-1, one or more excitation energy transfer components EET-2, and one or more small FWHM emitters S that emit light with a full width at half maximum (FWHM) of 0.25 eV or less. B , and selectively one or more host materials H BIt has been found that an organic electroluminescent device including a light-emitting layer containing [substance] has a long lifespan, a high quantum yield, and is ideally suitable for achieving the BT-2020 and DCPI3 color regions, showing narrow emission, and provides an organic electroluminescent device.

[0010] Here, one or more small full-width at half-maximum (FWHM) emitters S where EET-1 and / or EET-2 exhibit light emission B can transfer the excitation energy.

Mode for Carrying Out the Invention

[0011] The present invention relates to an organic electroluminescent device including a light-emitting layer B containing four components (i) to (iv): [[ID=!4]] (i) One or more excitation energy transfer components EET-1 each having a lowest excited singlet state S1 EET-1 with an energy level of E(S1 EET-1 ), and a lowest excited triplet state T1 EET-1 with an energy level of E(T1 EET-1 ); (ii) One or more excitation energy transfer components EET-2 each having a lowest excited singlet state S1 EET-2 with an energy level of E(S1 EET-2 ), and a lowest excited triplet state T1 EET-2 with an energy level of E(T1 EET-2 ); (iii) One or more small full-width at half-maximum (FWHM) emitters S each having a lowest excited singlet state S1 S with an energy level of E(S1 S ), and a lowest excited triplet state T1 S with an energy level of E(T1 S ), and emitting light having a full-width at half-maximum (FWHM) of 0.25 eV or less, and B and (iv) One or more each having a lowest excited singlet state S1 H with an energy level of E(S1 H ), and a lowest excited triplet state T1 [[ID=5!]] H) is the lowest excited triplet state T1 H Having one or more host materials H B , Here, EET-1 and EET-2 are not structurally identical. Here, EET-1 and EET-2 are TADF material E B And, Here, E(T1 EET-1 )>E(S1 S ) and E(T1 EET-2 )>E(S1 S ) and Here, |E(S1 EET-1 )-E(T1 EET-2 )|≦0.3eV, and |E(S1 EET-2 )-E(T1 EET-1 )|≦0.3eV, This means that both of the one or more excitation energy transfer components EET-1 and EET-2 are TADF materials, but their molecular structures are different. Energy level E(T1 EET-1 The lowest excited triplet state T1 EET-1 However, the energy level is E(S1 S The lowest excited singlet state S1 S It means that the energy is even higher. Energy level E(T1 EET-2 The lowest excited triplet state T1 EET-2 However, the energy level is E(S1 S The lowest excited singlet state S1 S It means that the energy is even higher. Energy level is E(S1 EET-1 The lowest excited singlet state S1 EET-1 And the energy level is E(T1 EET-2 The lowest excited triplet state T1 EET-2 The absolute value of the energy difference between them is 0.3 eV or less, and Energy level is E(S1 EET-2 The lowest excited singlet state S1 EET-2 And the energy level is E(T1 EET-1The lowest excited triplet state T1 EET-1 This means that the absolute value of the energy difference between them is 0.3 eV or less.

[0012] Throughout this specification, we will refer to the relationships between energies such as excited states, orbitals, and maximum emission of components within one or more light-emitting layers B of the organic electroluminescent element according to the present invention. It will be understood that a relationship involving the energies of two specific components applies only to light-emitting layers B that contain all of such specific components. Furthermore, the fact that one relationship applies to an element according to the present invention does not mean that all elements of the present invention must contain all the components mentioned in the relationship. In particular, the light-emitting layer B may selectively contain only one or more host materials H B It includes H B Refer to equations that show relationships relating to the excited state (S1, T1) or orbital (HOMO, LUMO) energies of a host material H. B It will be understood that this applies only to the light-emitting layer B which includes [the specified element]. Such general matters are applicable to all embodiments of the present invention.

[0013] The inventors have found that the aforementioned surprising beneficial effects on device performance are particularly achievable when the materials inside each of the one or more light-emitting layers B are preferably selected such that the requirements given by the above formulas (1) to (6) are satisfied (as long as each component is included in the same light-emitting layer B). The light-emitting layer B according to the present invention contains one or more excitation energy transfer components EET-1, one or more excitation energy transfer components EET-2, and one or more small FWHM emitters S B , and one or more selective host materials H B It is assumed that the requirements related to the HOMO- and LUMO- energies can provide a beneficial effect on device performance due to their influence on the recombination region (i.e., the region where excitons are generated by electron-hole recombination). This is explained in detail in the subchapters later in the text.

[0014] Furthermore, the material inside each of the one or more light-emitting layers B of the organic electroluminescent element according to the present invention includes not only at least one, preferably, each excitation energy transfer component EET-1, but also at least one, preferably, each excitation energy transfer component EET-2, and at least one, preferably, each small FWHM emitter S B The excitation energy is transferred to the small FWHM emitter S B Preferably, the device is selected to emit light having a full width at half maximum (FWHM) of 0.25 eV or less. This is also explained in detail in a subchapter later in the text.

[0015] If the aforementioned (preferred) requirements are met, an organic electroluminescent element exhibiting a long lifetime, high quantum yield, and narrow emission can be produced, which is ideally suited for achieving the BT-2020 and DCPI three-color regions.

[0016] In a preferred embodiment, at least one, preferably each light-emitting layer B, is made of one or more host materials H B Includes.

[0017] In one embodiment of the present invention, the organic electroluminescent element includes a light-emitting layer B consisting of exactly one (sub)layer, which includes the following: (i) One or more excitation energy transfer components EET-1, (ii) One or more excitation energy transfer components EET-2, (iii) Small FWHM emitter S of 1 or more B , and (iv) One or more host materials H B , Here, EET-1 and EET-2 are not structurally identical (i.e., they do not have the same chemical structure).

[0018] In one embodiment of the present invention, the organic electroluminescent element includes exactly one light-emitting layer B, and the light-emitting layer B consists of exactly one (sub)layer including the following: (i) One or more excitation energy transfer components EET-1, (ii) One or more excitation energy transfer components EET-2, (iii) Small FWHM emitter S of 1 or more B , and (iv) One or more host materials H B , Here, EET-1 and EET-2 are not structurally identical (i.e., they do not have the same chemical structure).

[0019] Combinations of sublayers 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 more 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 more preferred embodiment of the present invention, the electroluminescent element according to the present invention includes exactly one light-emitting layer B, and the light-emitting layer B consists of exactly one (sub)layer.

[0020] 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 excitation energy transfer component EET-1, exactly one excitation energy transfer component EET-2 and exactly one small FWHM emitter S B Includes.

[0021] 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 excitation energy transfer component EET-1, exactly one excitation energy transfer component EET-2 and exactly one small FWHM emitter S B Includes.

[0022] 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 , precisely one excitation energy transfer component EET-2 and precisely one small FWHM emitter S B Includes.

[0023] 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 one embodiment of the present invention, at least one, though 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.

[0024] 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.

[0025] Composition of the Emitting Layer (EML) B In describing the composition of one or more light-emitting layers B of the organic electroluminescent element according to the present invention in more detail below, the content of specific materials will be shown as a percentage where appropriate. Unless otherwise specified for a particular embodiment, all percentages refer to weight percentages, which have the same meaning as weight percent or weight % ((weight / weight), (w / w), wt.%). For example, in a particular composition, one or more small FWHM emitters S B When the content is mentioned as 1% exemplarily, this refers to one or more small FWHM emitters S B (That is, all S BIt is understood that the total weight (molecular sum) is 1% by weight, i.e., that it accounts for 1% of the total weight of each luminescent layer B. Whenever the composition of luminescent layer B is specified by providing a preferred content of its components in weight percent, it is understood that the sum of the total contents of all components equals 100% by weight (i.e., the total weight of each luminescent layer B).

[0026] (Selectively included) 1 or more host materials H B , 1 or more excitation energy transfer components EET-1, 1 or more excitation energy transfer components EET-2, and 1 or more small FWHM emitters S B This can be included in any amount and any proportion in the organic electroluminescent element according to the present invention.

[0027] In one embodiment, (at least one) host material H B , (at least one) excitation energy transfer component EET-1, (at least one) excitation energy transfer component EET-2 and (at least one) small FWHM emitter S B This can be present in any amount and any proportion in organic electroluminescent elements.

[0028] 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 one or more host materials H B (More specifically, H P and / or H N and / or H BP ) with one or more small FWHM emitters S B Contains more.

[0029] 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 one or more host materials H B (More specifically, H P and / or H N and / or H BPIt contains more than one excitation energy transfer component EET-2.

[0030] 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 one or more host materials H B (More specifically, H P and / or H N and / or H BP It contains more than one excitation energy transfer component EET-1.

[0031] In a preferred embodiment of the present invention, each of the one or more light-emitting layers B of the electroluminescent element according to the present invention transmits one or more excitation energy transfer components EET-1 to one or more small FWHM emitters S B Contains more.

[0032] 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 contains one or more excitation energy transfer components EET-1 in greater quantities than one or more excitation energy transfer components EET-2.

[0033] In one embodiment, in an organic electroluminescent element according to the present invention, at least one, preferably each light-emitting layer B (consisting of one (sub)layer or including one or more sublayers) comprises or consists of the following as a whole: (i) 30-99.7% by weight of one or more host compounds H B , (ii) 0.1 to 40% by weight of one or more excitation energy transfer components EET-1, (iii) 0.1 to 40% by weight of 1 or more excitation energy transfer components EET-2, (iv) Small FWHM emitters S of 0.1 to 10% by weight, 1 or more B , and selectively (v) 0 to 69.7% by weight of 1 or more solvents.

[0034] In one embodiment, in the organic electroluminescence device according to the present invention, at least one (which may consist of one layer of (sub) layer or include one or more sub layers), preferably each light-emitting layer B, as a whole, contains the total TADF material E including EET-1 and EET-2 B in a total amount of 20 to 40% by weight based on the total mass of the light-emitting layer B.

[0035] In one embodiment, in the organic electroluminescence device according to the present invention, at least one (which may consist of one layer of (sub) layer or include one or more sub layers), preferably each light-emitting layer B, as a whole, contains or consists of the following: (i) 12 to 60% by weight of one or more excitation energy transfer components EET-1, (ii) 0.1 to 30% by weight of one or more excitation energy transfer components EET-2, (iii) 0.1 to 10% by weight of one or more small FWHM emitters S B , (iv) 30 to 87.8% by weight of one or more host materials H B , and optionally (v) 0 to 57.8% by weight of one or more solvents.

[0036] In one embodiment, in the organic electroluminescence device according to the present invention, at least one (which may consist of one layer of (sub) layer or include one or more sub layers), preferably each light-emitting layer B, as a whole, contains or consists of the following: (i) 12 to 60% by weight of one or more excitation energy transfer components EET-1, (ii) 0.1 to 30% by weight of one or more excitation energy transfer components EET-2, (iii) 0.1 to 10% by weight of one or more small FWHM emitters S B , (iv) 30 to 87.8% by weight of one or more host materials H B , and optionally (v) 0 to 3% by weight of one or more solvents. [[ID=4​In a preferred embodiment of the present invention, at least one, preferably each light-emitting layer B, contains one or more small FWHM emitters S of 5% by weight or less based on the total weight of the light-emitting layer B B (in each light-emitting layer B, the total content of S B means 5% by weight or less).

[0038] In a more preferred embodiment of the present invention, at least one, preferably each light-emitting layer B, contains one or more small FWHM emitters S of 3% by weight or less based on the total weight of the light-emitting layer B B (in each light-emitting layer B, the total content of S B means 3% by weight or less).

[0039] In one embodiment of the present invention, at least one, preferably each light-emitting layer B, contains one or more small FWHM emitters S of 1% by weight or less based on the total weight of the light-emitting layer B B (in each light-emitting layer B, the total content of S B means 1% by weight or less).

[0040] In a preferred embodiment of the present invention, at least one, preferably each light-emitting layer B, contains one or more small FWHM emitters S of 0.5 to 0.7% by weight based on the total weight of the light-emitting layer B<00001​​​​​​​​​​​​​​(i) Each excitation energy transfer component EET-1 has an energy level E(S1 EET-1 ) Lowest excited singlet state S1 EET-1 , and energy level E(T1 EET-1 ) Lowest excited triplet state T1 EET-1 It has, (ii) Each excitation energy transfer component EET-2 has an energy level E(S1 EET-2 ) Lowest excited singlet state S1 EET-2 , and energy level E(T1 EET-2 ) Lowest excited triplet state T1 EET-2 It has, (iii) Each small half-width (FWHM) emitter S B This is the energy level E(S1 S ) Lowest excited singlet state S1 S , and energy level E(T1 S ) Lowest excited triplet state T1 S It has, (iv) Each (selectively included) host material H B is, energy level E(S1 H ) Lowest excited singlet state S1 H , and energy level E(T1 H ) Lowest excited triplet state T1 H It holds.

[0043] In one embodiment of the present invention, the following applies to materials included in the light-emitting layer B having the same relationship represented by formulas (7) to (9): E(S1 H )>E(S1 EET-1 ) (7) E(S1 H )>E(S1 EET-2 ) (8) E(S1 H )>E(S1 S ) (9).

[0044] Therefore, at least one, preferably each host material H B The lowest excited singlet state S1 HThis includes at least one, preferably the lowest excited singlet state S1 of each excitation energy transfer component EET-1. EET-1 The energy is higher (Equation 7), and at least one, preferably the lowest excited singlet state S1 of each excitation energy transfer component EET-2. EET-2 Higher energy (Equation 8), at least one, preferably each small FWHM emitter S B The lowest excited singlet state S1 S It has higher energy (Equation 9).

[0045] In one embodiment, the aforementioned relationships represented by formulas (7) to (9) apply to the materials contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0046] In one embodiment of the present invention, one or both of the relationships represented by the following formulas (10) and (11) apply to the same material contained in the light-emitting layer B: E(S1 EET-1 )>E(S1 S ) (10) E(S1 EET-2 )>E(S1 S ) (11).

[0047] Therefore, at least one, preferably the lowest excited singlet state S1 of each excitation energy transfer component EET-1. EET-1 (Equation 10), and / or at least one, preferably the lowest excited singlet state S1 of each excitation energy transfer component EET-2. EET-2 (Equation 11) comprises at least one, preferably each small FWHM emitter S B The lowest excited singlet state S1 S It has higher energy.

[0048] In one embodiment, one or both of the aforementioned relationships represented by formulas (10) and (11) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0049] In a preferred embodiment of the present invention, the following relationship is applied to materials contained in the light-emitting layer B, which are identical in nature: E(S1 H )>E(S1 EET-1 ) (7) E(S1 H )>E(S1 EET-2 ) (8) E(S1 H )>E(S1 S ) (9) E(S1 EET-1 )>E(S1 S ) (10) E(S1 EET-2 )>E(S1 S ) (11).

[0050] In one embodiment, the aforementioned relationships represented by formulas (7) to (11) apply to the materials contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0051] In a preferred embodiment of the present invention, the following formulas (13) and (14) are applied to the material contained in the light-emitting layer B having the same relationship: E(T1 H )>E(T1 EET-1 ) (13) E(T1 EET-1 )≧E(T1 EET-2 ) (14).

[0052] Therefore, at least one, preferably each host material H B The lowest excited triplet state T1 H This includes at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 Higher energy (Equation 13). Also, at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 This includes at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2The energy is the same as or higher than (Equation 14).

[0053] In one embodiment, the aforementioned relationships represented by formulas (13) and (14) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0054] In a preferred embodiment of the present invention, the following applies to materials contained in the light-emitting layer B having the same relationship represented by formulas (14) to (16): E(T1 EET-1 )≧E(T1 EET-2 ) (14) E(T1 EET-2 )>E(S1 S ) (15) E(T1 EET-2 )>E(T1 S ) (16).

[0055] Therefore, at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 This includes at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 At least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2, which has the same energy as or higher than (Equation 14). EET-2 This includes at least one, preferably, small FWHM emitters S B The lowest excited singlet state S1 S Even higher energy (Equation 15), at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 This includes at least one, preferably, small FWHM emitters S B The lowest excited triplet state T1 S The energy is even higher (Equation 16).

[0056] In one embodiment, the aforementioned relationships represented by formulas (14) to (16) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0057] In a preferred embodiment of the present invention, the relationships represented by the following formulas (7) to (10) and (15) apply, as long as each component is contained in the same light-emitting layer B: E(S1 H )>E(S1 EET-1 ) (7) E(S1 H )>E(S1 EET-2 ) (8) E(S1 H )>E(S1 S ) (9) E(S1 EET-1 )>E(S1 S ) (10) E(T1 EET-2 )>E(S1 S ) (15).

[0058] In one embodiment, the aforementioned relationships represented by formulas (7) to (10) and (15) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0059] In an alternative embodiment of the present invention, the following relationships represented by formulas (17) and (10) apply to the materials contained in the same light-emitting layer B: E(T1 EET-2 )>E(T1 EET-1 ) (17) E(S1 EET-1 )>E(S1 S ) (10).

[0060] Therefore, at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 This includes at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1A higher energy (Equation 17), at least one, preferably the lowest excited singlet state S1 of each excitation energy transfer component EET-1. EET-1 This includes at least one, preferably, small FWHM emitters S B The lowest excited singlet state S1 S The energy is even higher (Equation 10).

[0061] In an alternative embodiment, the aforementioned relationships represented by formulas (17) and (10) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0062] In a preferred embodiment of the present invention, the following relationships represented by formulas (18), (15), (19), and (20) are applied to materials contained in the light-emitting layer B: E(T1 H )>E(T1 EET-2 ) (18) E(T1 EET-2 )>E(S1 S ) (15) E(T1 H )>E(S1 EET-1 ) (19) E(T1 EET-1 )>E(T1 EET-2 ) (20).

[0063] Therefore, at least one, preferably each host material H B The lowest excited triplet state T1 H This includes at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 Even higher energy (Equation 18), at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 This includes at least one, preferably, small FWHM emitters S B The lowest excited singlet state S1 S Even higher energy (Equation 15), at least one, preferably each host material H BThe lowest excited triplet state T1 H This includes at least one, preferably the lowest excited singlet state S1 of each excitation energy transfer component EET-1. EET-1 Even higher energy (Equation 19), at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 This includes at least one, preferably the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 The energy is even higher (Equation 20).

[0064] In one embodiment, the aforementioned relationships represented by formulas (18), (15), (19), and (20) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0065] In one embodiment of the present invention, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 And at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 The energy difference between them is less than 0.3 eV: E(T1) EET-2 )-E(T1 EET-1 ) < 0.3eV and E(T1 EET-1 )-E(T1 EET-2 ) < 0.3eV.

[0066] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 And at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 The energy difference between them is less than 0.3 eV: E(T1) EET-2 )-E(T1 EET-1 ) < 0.3eV and E(T1 EET-1 )-E(T1 EET-2 ) < 0.3eV.

[0067] In one embodiment of the present invention, in each of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 And at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 The energy difference between them is less than 0.3 eV: E(T1) EET-2 )-E(T1 EET-1 ) < 0.3eV and E(T1 EET-1 )-E(T1 EET-2 ) < 0.3eV.

[0068] In one embodiment of the present invention, the following applies to materials included in the light-emitting layer B having the same relationship represented by formula (20): E(T1 EET-1 )>E(T1 EET-2 ) (20).

[0069] In one embodiment, the aforementioned relationship represented by formula (20) applies to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0070] In a preferred embodiment of the present invention, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 And at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 The energy difference between them is less than 0.2 eV: E(T1) EET-2 )-E(T1 EET-1 ) < 0.2eV and E(T1 EET-1 )-E(T1 EET-2 ) < 0.2eV.

[0071] In a preferred embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2And at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 The energy difference between them is less than 0.2 eV: E(T1) EET-2 )-E(T1 EET-1 ) < 0.2eV and E(T1 EET-1 )-E(T1 EET-2 ) < 0.2eV.

[0072] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 And at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-1. EET-1 The energy difference between them is less than 0.2 eV: E(T1) EET-2 )-E(T1 EET-1 ) < 0.2eV and E(T1 EET-1 )-E(T1 EET-2 ) < 0.2eV.

[0073] In a preferred embodiment of the present invention, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 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) EET-2 )-E(S1 S ) < 0.3eV and E(S1 S )-E(T1 EET-2 ) < 0.3eV.

[0074] In a preferred embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 and at least one, preferably, small half-width (FWHM) emitter S B The lowest excited singlet state S1S The energy difference between them is less than 0.3 eV: E(T1) EET-2 )-E(S1 S ) < 0.3eV and E(S1 S )-E(T1 EET-2 ) < 0.3eV.

[0075] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 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) EET-2 )-E(S1 S ) < 0.3eV and E(S1 S )-E(T1 EET-2 ) < 0.3eV.

[0076] In a preferred embodiment of the present invention, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2. EET-2 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 0.2 eV: E(T1) EET-2 )-E(S1 S ) < 0.2eV and E(S1 S )-E(T1 EET-2 ) < 0.2eV.

[0077] In a preferred embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 and at least one, preferably, small half-width (FWHM) emitter S B The lowest excited singlet state S1 SThe energy difference between them is less than 0.2 eV: E(T1) EET-2 )-E(S1 S ) < 0.2eV and E(S1 S )-E(T1 EET-2 ) < 0.2eV.

[0078] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, at least one, preferably, the lowest excited triplet state T1 of each excitation energy transfer component EET-2 EET-2 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 0.2 eV: E(T1) EET-2 )-E(S1 S ) < 0.2eV and E(S1 S )-E(T1 EET-2 ) < 0.2eV.

[0079] HOMO-LUMO-Energy Related As described above, this relates to an organic electroluminescent element containing one or more light-emitting layers B, each consisting of one or more sublayers, where the one or more sublayers are adjacent to each other and collectively include the following: (i) Each has an energy of E HOMO The highest occupied orbital HOMO(EET-1) is (EET-1), and the energy is E LUMO (EET-1) has the lowest unoccupied orbital LUMO(EET-1), one or more excitation energy transfer components EET-1, (ii) Each has an energy of E HOMO The highest occupied orbital HOMO(EET-2) is (EET-2), and the energy is E LUMO Having one or more excitation energy transfer components EET-2, the lowest unoccupied orbital LUMO(EET-2) is (EET-2), (iii) Each has an energy of E HOMO (S B ) is the highest occupied orbit HOMO(S B ), and energy E LUMO (SB ) is the lowest open orbit LUMO(S B ) has one or more small FWHM emitters S B Here, each S B It emits light having a half-width (FWHM) of 0.25 eV or less, and selectively (iv) Each has an energy of E HOMO (H B ) is the highest occupied orbit HOMO(H B ), and energy E LUMO (H B ) is the lowest unsaturated orbit LUMO(H B ) having one or more host materials H B , Here, EET-1 and EET-2 are not structurally identical (i.e., they do not have the same chemical structure), Here, one or more sublayers located on the outer surface of each light-emitting layer B are EET-1, EET-2, and a small FWHM emitter S B It includes one or more materials selected from the group consisting of, Here, as long as each component is contained in the same light-emitting layer B, the relationships expressed by the following equations (1) to (6) apply: E LUMO (EET-1) <E LUMO (H B ) (1) E LUMO (EET-1) <E LUMO (EET-2) (2) E LUMO (EET-1) <E LUMO (S B ) (3) E HOMO (EET-2)≧E HOMO (H B ) (4) E HOMO (EET-2)≧E HOMO (EET-1) (5) E HOMO (EET-2)≧E HOMO (S B ) (6).

[0080] In one embodiment, the aforementioned relationships represented by formulas (1) to (6) also apply to materials contained in any one of the one or more light-emitting layers B of the organic electroluminescent element according to the present invention, as long as each component is contained in the same light-emitting layer B.

[0081] In one embodiment of the present invention, the energy is E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B ) is when the energy is E HOMO (H B At least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (S B )>E HOMO (H B ).

[0082] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, the energy is E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B ) is when the energy is E HOMO (H B At least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (S B )>E HOMO (H B ).

[0083] In one embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S BThe highest occupied orbital HOMO(S B ) is when the energy is E HOMO (H B At least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (S B )>E HOMO (H B ).

[0084] In one embodiment of the present invention, the energy is E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B ) is when the energy is E HOMO At least one of the (EET-1) is preferably an excitation energy transfer component EET-1 with an energy even higher than the highest occupied orbital HOMO(EET-1) of each EET-1. HOMO (S B )>E HOMO (EET-1).

[0085] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, the energy is E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B ) is when the energy is E HOMO At least one of the (EET-1) is preferably an excitation energy transfer component EET-1 with an energy even higher than the highest occupied orbital HOMO(EET-1) of each EET-1. HOMO (S B )>E HOMO (EET-1).

[0086] In one embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO (S BAt least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B ) is when the energy is E HOMO At least one of the (EET-1) is preferably an excitation energy transfer component EET-1 with an energy even higher than the highest occupied orbital HOMO(EET-1) of each EET-1. HOMO (S B )>E HOMO (EET-1).

[0087] In one embodiment of the present invention, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO At least one of the (EET-1) is preferably an excitation energy transfer component EET-1 with an energy even higher than the highest occupied orbital HOMO(EET-1) of each EET-1. HOMO (EET-2)>E HOMO (EET-1).

[0088] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO At least one of the (EET-1) is preferably an excitation energy transfer component EET-1 with an energy even higher than the highest occupied orbital HOMO(EET-1) of each EET-1. HOMO (EET-2)>E HOMO (EET-1).

[0089] In one embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMOAt least one of the (EET-1) is preferably an excitation energy transfer component EET-1 with an energy even higher than the highest occupied orbital HOMO(EET-1) of each EET-1. HOMO (EET-2)>E HOMO (EET-1).

[0090] In one embodiment of the present invention, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO (H B At least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (EET-2)>E HOMO (H B ).

[0091] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO (H B At least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (EET-2)>E HOMO (H B ).

[0092] In one embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO (H B At least one of the host materials H is preferably one of the host materials H BThe highest occupied orbit HOMO(H B ) has even higher energy: E HOMO (EET-2)>E HOMO (H B ).

[0093] In one embodiment of the present invention, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B ) has even higher energy: E HOMO (EET-2)>E HOMO (S B ).

[0094] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B ) has even higher energy: E HOMO (EET-2)>E HOMO (S B ).

[0095] In one embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, has an energy of E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S BThe highest occupied orbital HOMO(S B ) has even higher energy: E HOMO (EET-2)>E HOMO (S B ).

[0096] In one embodiment of the present invention, at least one, preferably, the highest occupied orbital HOMO(EET-1) of each excitation energy transfer component EET-1 is at least one, preferably, each small FWHM emitter S B The highest occupied orbital HOMO(S B ) has the same energy as or lower than: E HOMO (EET-1)≦E HOMO (S B ).

[0097] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, at least one, preferably the highest occupied orbital HOMO(EET-1) of each excitation energy transfer component EET-1, is at least one, preferably the small FWHM emitter S B The highest occupied orbital HOMO(S B ) has the same energy as or lower than: E HOMO (EET-1)≦E HOMO (S B ).

[0098] In one embodiment of the present invention, in each of the one or more light-emitting layers B, at least one, preferably the highest occupied orbital HOMO(EET-1) of each excitation energy transfer component EET-1, is at least one, preferably the small FWHM emitter S B The highest occupied orbital HOMO(S B ) has the same energy as or lower than: E HOMO (EET-1)≦E HOMO (S B ).

[0099] In a preferred embodiment of the present invention, the energy is E HOMOAt least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0 eV <E HOMO (EET-2)-E HOMO (S B ) < 0.8 eV.

[0100] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has an energy of E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0 eV <E HOMO (EET-2)-E HOMO (S B ) < 0.8 eV.

[0101] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B The energy difference with ) is greater than 0.0 eV and less than 0.3 eV: 0.0 eV <E HOMO (EET-2)-E HOMO(S B ) < 0.8 eV.

[0102] In a preferred embodiment of the present invention, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B The energy difference with (E HOMO (EET-2)-E HOMO (S B (E) > 0eV, preferably greater than 0.1eV HOMO (EET-2)-E HOMO (S B (E) > 0.1eV, more preferably greater than 0.2eV HOMO (EET-2)-E HOMO (S B (E) > 0.2eV, or more preferably, greater than 0.3eV (E) HOMO (EET-2)-E HOMO (S B )>0.3eV).

[0103] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has an energy of E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B The energy difference with (E HOMO (EET-2)-E HOMO (S B (E) > 0eV, preferably greater than 0.1eV HOMO (EET-2)-EHOMO (S B (E) > 0.1eV, more preferably greater than 0.2eV HOMO (EET-2)-E HOMO (S B (E) > 0.2eV, or more preferably, greater than 0.3eV (E) HOMO (EET-2)-E HOMO (S B )>0.3eV).

[0104] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (S B At least one, preferably each small half-width (FWHM) emitter S B The highest occupied orbital HOMO(S B The energy difference with (E HOMO (EET-2)-E HOMO (S B (E) > 0eV, preferably greater than 0.1eV HOMO (EET-2)-E HOMO (S B (E) > 0.1eV, more preferably greater than 0.2eV HOMO (EET-2)-E HOMO (S B (E) > 0.2eV, or more preferably, greater than 0.3eV (E) HOMO (EET-2)-E HOMO (S B )>0.3eV).

[0105] In a preferred embodiment of the present invention, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMOAt least one of (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the highest occupied orbital HOMO(EET-1) is greater than 0 eV (E HOMO (EET-2)-E HOMO (EET-1)>0eV), preferably greater than 0.1eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E HOMO (EET-2)-E HOMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.4eV), especially greater than 0.5eV (E HOMO (EET-2)-E HOMO (EET-1)>0.5eV).

[0106] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has an energy of E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO At least one of (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the highest occupied orbital HOMO(EET-1) is greater than 0 eV (E HOMO (EET-2)-E HOMO (EET-1)>0eV), preferably greater than 0.1eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E HOMO (EET-2)-E HOMO(EET-1)>0.3eV), more preferably greater than 0.4eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.4eV), especially greater than 0.5eV (E HOMO (EET-2)-E HOMO (EET-1)>0.5eV).

[0107] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO At least one of (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the highest occupied orbital HOMO(EET-1) is greater than 0 eV (E HOMO (EET-2)-E HOMO (EET-1)>0eV), preferably greater than 0.1eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E HOMO (EET-2)-E HOMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E HOMO (EET-2)-E HOMO (EET-1) > 0.4eV), especially greater than 0.5eV (E HOMO (EET-2)-E HOMO (EET-1)>0.5eV).

[0108] In a preferred embodiment of the present invention, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (H BAt least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B The energy difference with (E HOMO (EET-2)-E HOMO (H B (E) > 0eV, preferably greater than 0.1eV HOMO (EET-2)-E HOMO (H B (E) > 0.1eV, more preferably greater than 0.2eV HOMO (EET-2)-E HOMO (H B (E) > 0.2eV, more preferably greater than 0.3eV HOMO (EET-2)-E HOMO (H B )>0.3eV), more preferably greater than 0.4eV (E HOMO (EET-2)-E HOMO (H B )>0.4eV), especially greater than 0.5eV (E HOMO (EET-2)-E HOMO (H B )>0.5eV).

[0109] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has an energy of E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (H B At least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B The energy difference with (E HOMO (EET-2)-E HOMO (H B (E) > 0eV, preferably greater than 0.1eV HOMO (EET-2)-E HOMO (H B (E) > 0.1eV, more preferably greater than 0.2eV HOMO (EET-2)-EHOMO (H B (E) > 0.2eV, more preferably greater than 0.3eV HOMO (EET-2)-E HOMO (H B )>0.3eV), more preferably greater than 0.4eV (E HOMO (EET-2)-E HOMO (H B )>0.4eV), especially greater than 0.5eV (E HOMO (EET-2)-E HOMO (H B )>0.5eV).

[0110] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E HOMO At least one (EET-2), preferably the highest occupied orbital HOMO(EET-2) of each excitation energy transfer component EET-2, and the energy E HOMO (H B At least one of the host materials H is preferably one of the host materials H B The highest occupied orbit HOMO(H B The energy difference with (E HOMO (EET-2)-E HOMO (H B (E) > 0eV, preferably greater than 0.1eV HOMO (EET-2)-E HOMO (H B (E) > 0.1eV, more preferably greater than 0.2eV HOMO (EET-2)-E HOMO (H B (E) > 0.2eV, more preferably greater than 0.3eV HOMO (EET-2)-E HOMO (H B )>0.3eV), more preferably greater than 0.4eV (E HOMO (EET-2)-E HOMO (H B )>0.4eV), especially greater than 0.5eV (E HOMO (EET-2)-E HOMO (H B )>0.5eV).

[0111] In one embodiment of the present invention, the energy is E LUMO (S B At least one, preferably each small half-width (FWHM) emitter S B Lowest altitude orbit LUMO(S B ) and energy E LUMO At least one of the (EET-1) components, preferably one in which the energy difference between the lowest unoccupied orbital LUMO(EET-1) and each excitation energy transfer component EET-1 is greater than 0.0 eV and less than 0.3 eV: 0.0 eV <E LUMO (S B )-E LUMO (EET-1) < 0.3 eV.

[0112] In one embodiment of the present invention, in at least one of the one or more light-emitting layers B, the energy is E LUMO (S B At least one, preferably each small half-width (FWHM) emitter S B Lowest altitude orbit LUMO(S B ) and energy E LUMO At least one of the (EET-1) components, preferably one in which the energy difference between the lowest unoccupied orbital LUMO(EET-1) and each excitation energy transfer component EET-1 is greater than 0.0 eV and less than 0.3 eV: 0.0 eV <E LUMO (S B )-E LUMO (EET-1) < 0.3 eV.

[0113] In one embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E LUMO (S B At least one, preferably each small half-width (FWHM) emitter S B Lowest altitude orbit LUMO(S B ) and energy E LUMOAt least one of the (EET-1) components, preferably one in which the energy difference between the lowest unoccupied orbital LUMO(EET-1) and each excitation energy transfer component EET-1 is greater than 0.0 eV and less than 0.3 eV: 0.0 eV <E LUMO (S B )-E LUMO (EET-1) < 0.3 eV.

[0114] In a preferred embodiment of the present invention, the energy is E LUMO (S B At least one, preferably each small half-width (FWHM) emitter S B Lowest altitude orbit LUMO(S B ) and energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (S B )-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (S B )-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (S B )-E LUMO (EET-1) > 0.2eV), particularly preferably greater than 0.3eV (E LUMO (S B )-E LUMO (EET-1)>0.3eV).

[0115] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has an energy of E LUMO (S B At least one, preferably each small half-width (FWHM) emitter S B Lowest altitude orbit LUMO(S B ) and energy E LUMOAt least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (S B )-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (S B )-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (S B )-E LUMO (EET-1) > 0.2eV), particularly preferably greater than 0.3eV (E LUMO (S B )-E LUMO (EET-1)>0.3eV).

[0116] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E LUMO (S B At least one, preferably each small half-width (FWHM) emitter S B Lowest altitude orbit LUMO(S B ) and energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (S B )-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (S B )-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (S B )-E LUMO (EET-1) > 0.2eV), particularly preferably greater than 0.3eV (E LUMO (S B )-E LUMO (EET-1)>0.3eV).

[0117] In a preferred embodiment of the present invention, the energy is E LUMO At least one (EET-2), preferably the lowest unoccupied orbital LUMO(EET-2) of each excitation energy transfer component EET-2, and the energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (EET-2)-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E LUMO (EET-2)-E LUMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.4eV), especially greater than 0.5eV (E LUMO (EET-2)-E LUMO (EET-1)>0.5eV).

[0118] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has an energy of E LUMO At least one (EET-2), preferably the lowest unoccupied orbital LUMO(EET-2) of each excitation energy transfer component EET-2, and the energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (EET-2)-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (ELUMO (EET-2)-E LUMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E LUMO (EET-2)-E LUMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.4eV), especially greater than 0.5eV (E LUMO (EET-2)-E LUMO (EET-1)>0.5eV).

[0119] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E LUMO At least one (EET-2), preferably the lowest unoccupied orbital LUMO(EET-2) of each excitation energy transfer component EET-2, and the energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (EET-2)-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E LUMO (EET-2)-E LUMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E LUMO (EET-2)-E LUMO (EET-1) > 0.4eV), especially greater than 0.5eV (E LUMO (EET-2)-E LUMO (EET-1)>0.5eV).

[0120] In a preferred embodiment of the present invention, the energy is E LUMO (H BAt least one of the host materials H is preferably one of the host materials H B Lowest airspace orbit LUMO(H B ) and energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (H B )-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (H B )-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (H B )-E LUMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E LUMO (H B )-E LUMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E LUMO (H B )-E LUMO (EET-1) > 0.4eV), especially greater than 0.5eV (E LUMO (H B )-E LUMO (EET-1)>0.5eV).

[0121] In a preferred embodiment of the present invention, at least one of the one or more light-emitting layers B has an energy of E LUMO (H B At least one of the host materials H is preferably one of the host materials H B Lowest airspace orbit LUMO(H B ) and energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (H B )-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (HB )-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (H B )-E LUMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E LUMO (H B )-E LUMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E LUMO (H B )-E LUMO (EET-1) > 0.4eV), especially greater than 0.5eV (E LUMO (H B )-E LUMO (EET-1)>0.5eV).

[0122] In a preferred embodiment of the present invention, in each of the one or more light-emitting layers B, the energy is E LUMO (H B At least one of the host materials H is preferably one of the host materials H B Lowest airspace orbit LUMO(H B ) and energy E LUMO At least one (EET-1), preferably, the energy difference between each excitation energy transfer component EET-1 and the lowest unoccupied orbital LUMO(EET-1) is greater than 0 eV (E LUMO (H B )-E LUMO (EET-1)>0eV), preferably greater than 0.1eV (E LUMO (H B )-E LUMO (EET-1) > 0.1eV), more preferably greater than 0.2eV (E LUMO (H B )-E LUMO (EET-1) > 0.2eV), more preferably greater than 0.3eV (E LUMO (H B )-E LUMO (EET-1)>0.3eV), more preferably greater than 0.4eV (E LUMO (H B )-E LUMO(EET-1) > 0.4eV), especially greater than 0.5eV (E LUMO (H B )-E LUMO (EET-1)>0.5eV).

[0123] Relationship with maximum emission In one embodiment of the present invention, one or both of the relationships represented by formulas (21) and (22) apply to the same material contained in the light-emitting layer B: |E λmax (EET-2)-E λmax (S B )|<0.30eV (21) |E λmax (EET-1)-E λmax (S B )|<0.30eV (22). This means the following: In each light-emitting layer B, at least one, preferably, the energy of the maximum emission given by the electron volts (eV) of each excitation energy transfer component EET-2 EET-2 λmax (EET-2) and at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B The energy difference with ) is less than 0.30 eV (Equation 21), and / or at least one, preferably, the energy of the maximum emission given by the electron volts (eV) of each excitation energy transfer component EET-1. λmax (EET-1) and at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B The energy difference with ) is less than 0.30 eV (Equation 22).

[0124] In one embodiment, one or both of the aforementioned relationships represented by formulas (21) and (22) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0125] In a preferred embodiment of the present invention, one or both of the relationships represented by formulas (23) and (24) apply to materials contained in the same light-emitting layer B: |E λmax (EET-2)-E λmax (S B )|<0.20eV (23) |E λmax (EET-1)-E λmax (S B )|<0.20eV (24). This means the following: In each light-emitting layer B, at least one, preferably, the energy of the maximum emission given by the electron volts (eV) of each excitation energy transfer component EET-2 EET-2 λmax (EET-2) and at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B The energy difference with ) is less than 0.20 eV (Equation 23), and / or at least one, preferably, the energy of the maximum emission given by the electron volts (eV) of each excitation energy transfer component EET-1. λmax (EET-1) and at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B The energy difference with ) is less than 0.20 eV (Equation 24).

[0126] In one embodiment, one or both of the aforementioned relationships represented by formulas (23) and (24) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0127] In a more preferred embodiment of the present invention, one or both of the relationships represented by formulas (25) and (26) apply to materials contained in the same light-emitting layer B: |E λmax (EET-2)-E λmax (SB )|<0.10eV (25) |E λmax (EET-1)-E λmax (S B )|<0.10eV (26). This means the following: In each light-emitting layer B, at least one, preferably, the energy of the maximum emission given by the electron volts (eV) of each excitation energy transfer component EET-2 EET-2 λmax (EET-2) and at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B The energy difference with ) is less than 0.10 eV (Equation 25), and / or at least one, preferably, the energy of the maximum emission given by the electron volts (eV) of each excitation energy transfer component EET-1 is less than 0.10 eV. λmax (EET-1) and at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B The energy difference with ) is less than 0.10 eV (Equation 26).

[0128] In one embodiment, one or both of the aforementioned relationships represented by formulas (25) and (26) apply to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0129] In one embodiment of the present invention, the relationship expressed by formula (27) is the same and applies to the materials contained in the light-emitting layer B: E λmax (EET-2)>E λmax (S B )(27). This means that within each light-emitting layer B, at least one, preferably, the maximum emission energy E given by the electron volts (eV) of each excitation energy transfer component EET-2 λmax(EET-2) has at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B This means it is greater than ).

[0130] In one embodiment, the aforementioned relationship represented by formula (27) applies to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0131] In one embodiment of the present invention, the relationship expressed by formula (28) is applied to the material contained in the light-emitting layer B, which is identical: E λmax (EET-1)>E λmax (S B )(28). This means that within each light-emitting layer B, at least one, preferably, the maximum emission energy E given by the electron volts (eV) of each excitation energy transfer component EET-1. λmax (EET-1) has at least one, preferably each small FWHM emitter S B The maximum emission energy E given by electron volts (eV) λmax (S B This means it is greater than ).

[0132] In one embodiment, the aforementioned relationship represented by formula (28) applies to the material contained in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0133] 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 less than 0.13 eV.

[0134] A further embodiment of the present invention is 1000 cd / m². 2 This relates to an electroluminescent element (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 than 20%, and shows maximum light emission at 500 nm to 560 nm.

[0135] A further embodiment of the present invention is 1000 cd / m². 2 This relates to an electroluminescent element (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 than 20%, and shows maximum light emission at 510 nm to 550 nm.

[0136] 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 than 20%, and shows maximum light emission at 515 nm to 540 nm.

[0137] In a preferred embodiment, the electroluminescent element (e.g., OLED) has a constant current density J0 = 15 mA / cm². 2In this case, the LT95 value is 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.

[0138] 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 less than 0.13 eV. 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 (=0.170) and CIEy (=0.797) 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. 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, a top-emitting element (with a transparent top electrode) is typically used, while the test element used throughout the present invention represents a bottom-emitting element (with a transparent bottom electrode and substrate). Therefore, a further aspect of the present invention relates to an electroluminescent element (e.g., OLED) whose 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 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 more preferably 0.79 to 0.84.

[0139] 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, a top-emitting element (with a transparent top electrode) is typically used, while the test element used throughout the present invention represents a bottom-emitting element (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 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 more preferably 0.64 to 0.66.

[0140] A further embodiment of the present invention is 1000 cd / m². 2 This relates to an electroluminescent element (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 than 20%, and shows maximum light emission at 420 nm to 500 nm.

[0141] 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 than 20%, and shows maximum light emission at 440 nm to 480 nm.

[0142] A further embodiment of the present invention is 1000 cd / m². 2This relates to an electroluminescent element (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 than 20%, and shows maximum light emission at 450 nm to 470 nm.

[0143] 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 maximum emission at 420nm to 500nm, preferably 430nm to 490nm, more preferably 440nm to 480nm, even more preferably 450nm to 470nm, and / or 500cd / m². 2 In this regard, we relate to electroluminescent elements (e.g., OLEDs) that exhibit an LT80 value exceeding 100 hours, preferably exceeding 200 hours, more preferably exceeding 400 hours, even more preferably exceeding 750 hours, or even more preferably exceeding 1000 hours.

[0144] 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 less than 0.13 eV.

[0145] A further embodiment of the present invention relates to an electroluminescent element (e.g., OLED) that emits light having color coordinates of CIEx and CIEy close to the color coordinates of CIEx (=0.131) and CIEy (=0.046) of primary color blue as defined by ITU-R Recommendation BT.2020 (Rec.2020), which is suitable for use in UHD displays, e.g., UHD-TV. The term "close" in this paragraph indicates the range of CIEx and CIEy coordinates provided at the end of this paragraph. In commercial applications, typically top-emitting elements (where the top electrode is transparent) are used, while the test elements used throughout the present invention indicate bottom-emitting elements (where the bottom electrode and the substrate are transparent). The CIEy color coordinate of the blue element decreases by up to 2 times when changing from a bottom-emitting element to a top-emitting element, while CIEx hardly changes (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 whose emission shows 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 particularly 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 particularly preferably 0.04 to 0.10.

[0146] A further embodiment of the present invention is 1000 cd / m 2In this case, it exhibits an external quantum efficiency of more than 8%, preferably more than 10%, more preferably more than 13%, even more preferably more than 15%, or even more than 20%, and / or exhibits maximum emission at 590nm to 690nm, preferably 610nm to 665nm, more preferably 620nm to 640nm, and / or 500cd / m² 2 The present invention relates to an electroluminescent element (e.g., OLED) exhibiting an LT80 value exceeding 100h, preferably exceeding 200h, more preferably exceeding 400h, even more preferably exceeding 750h, or even more preferably exceeding 1000h. Therefore, a further aspect of the present invention relates to an OLED exhibiting a CIEy color coordinate exceeding 0.25, preferably exceeding 0.27, more preferably exceeding 0.29, and even more preferably exceeding 0.30.

[0147] 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, a top-emitting element (with a transparent top electrode) is typically used, while the test element used throughout the present invention represents a bottom-emitting element (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 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 more preferably 0.29 to 0.35.

[0148] Therefore, a further aspect of the present invention is 14500 cd / m². 2 The present invention relates to an electroluminescent element (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 than 20%, and / or exhibits maximum light emission at 590nm to 690nm, preferably 610nm to 665nm, more preferably 620nm to 640nm.

[0149] One of the objects of interest of organic electroluminescent devices is also the generation of light. Accordingly, the present invention also relates to a method of generating light in a desired wavelength range, including the step of providing any organic electroluminescent device according to the present invention.

[0150] Accordingly, a further aspect of the present invention relates to a method of generating light in a desired wavelength range, including the following steps: (i) providing an organic electroluminescent device according to the present invention, and (ii) applying an electric current to the organic electroluminescent device.

[0151] A further aspect of the present invention relates to a method of manufacturing an organic electroluminescent device by constituting the aforementioned elements. The present invention also relates to a method of generating green light, particularly by using the organic electroluminescent device.

[0152] A further aspect of the present invention relates to an organic electroluminescent device to which at least one, preferably exactly one, of the relationships represented by the following formulas (29) to (31) is applied to the material contained in the same light-emitting layer B: 440nm < λ max (S B ) < 470nm (29) 510nm < λ max (S B ) < 550nm (30) 610nm < λ max (S B ) < 665nm (31) Here, λ max (S B ) is the maximum emission of at least one, preferably each small FWHM emitter S B , and is given in nanometers (nm).

[0153] In one embodiment of the present invention, at least one, preferably exactly one, of the relationships represented by the following formulas (29) to (31) applies to a material included in one of the one or more light-emitting layers B of the organic electroluminescent element according to the present invention.

[0154] A further aspect of the present invention relates to a method for generating light, which includes the following steps: (i) A step of providing an organic electroluminescent element according to the present invention, and (ii) The step of applying an electric current to the organic electroluminescent element.

[0155] A further aspect of the present invention relates to a method for generating light, which includes the following steps: (i) A step of providing an organic electroluminescent element according to the present invention, and (ii) The step of 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) 440 nm to 470 nm, or (iii) 610nm to 665nm.

[0156] Skilled technicians understand that, depending on the structure, one or more excitation energy transfer components EET-1 (see below) and one or more excitation energy transfer components EET-2 (see below) can be used as emitters in an organic electroluminescent device. However, preferably, in the organic electroluminescent device according to the present invention, the primary function of one or more excitation energy transfer components EET-1 and one or more excitation energy transfer components EET-2 is not to emit light. In a preferred embodiment, when a voltage (and current) is applied, the organic electroluminescent device 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 than 90%) from one or more small FWHM emitters 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.

[0157] In a preferred embodiment of the present invention, the relationship represented by the following formula (32) applies:

number

[0158] For example, two small FWHM emitters S, each having a light-emitting layer B with a concentration of 1% by weight. B If 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-coated film would amount to 98% by weight of the spin-coated film. The matrix material of such a spin-coated film is the host material H contained in the light-emitting layer B of the organic electroluminescent element. B The weight ratio may be selected to reflect the weight ratio. 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 at 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.

[0159] When the organic electroluminescent element according to the present invention includes one or more light-emitting layers B, the relationship represented by formula (32) preferably applies to all light-emitting layers B included in the element.

[0160] 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.

[0161] 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 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.

[0162] Small FWHM emitter S in the context of the present invention B For the selection of fluorescent emitters for use, it should be noted that the FWHM value is determined as described in the subchapter below (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 (32) and preferred embodiments related to the present invention. SB It is not understood as a value.

[0163] The examples and claims further illustrate the present invention.

[0164] Host material H B According to the present invention, any one or more host materials H contained in any one or more light-emitting layers 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.

[0165] 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 N LUMO energy E ) ≤ -2.70 eV LUMO (H N ) has. LUMO is the lowest-empty orbit. The energy of LUMO is determined as described in the subchapter below the main text.

[0166] 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 (H P )≧-5.70eV, more preferably E HOMO (H P HOMO energy E ≥ -5.40 eV HOMO (H P ) has. The HOMO is the highest occupied orbital. The energy of the HOMO is determined as described in the subchapter below the main text.

[0167] In a preferred embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention contains at least one, preferably 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)≧ -5.70 eV, more preferably, E HOMO (H P )≧ -5.40 eV of the HOMO energy E HOMO (H P ) having a p-host H P is. The HOMO is the highest occupied orbital.

[0168] In one embodiment of the present invention, in each light-emitting layer B, at least one contained in the light-emitting layer B, preferably, each p-host H P has a HOMO energy E HOMO (H P ) smaller than -5.60 eV.

[0169] In the context of the present invention, the bipolar host H showing high electron mobility BP preferably has a LUMO energy E LUMO (H BP )≦ -2.50 eV, more preferably, E LUMO (H BP )≦ -2.60 eV, even more preferably, E LUMO (H BP )≦ -2.65 eV, still more preferably, E LUMO (H BP )≦ -2.70 eV. The LUMO is the lowest unoccupied orbital. The energy of the LUMO is determined as described in the subchapter after this text. LUMO (H BP ) having.

[0170] In the context of the present invention, the bipolar host H showing high hole mobility BP preferably has a HOMO energy E HOMO (H BP )≧ -6.30 eV, more preferably, E HOMO (H BP )≧ -5.90 eV, even more preferably, E HOMO (H BP )≧ -5.70 eV, still more preferably, E HOMO (H BP )≧ -5.40 eV. HOMO (HBP ) has. The HOMO is the highest occupied orbital. The energy of the HOMO is determined as described in the subchapter below the main text.

[0171] In one embodiment of the present invention, a bipolar host material H BP Preferably, each bipolar host material H BP It satisfies all of the following requirements: (i) -2.50eV or less (E LUMO (H BP )≦-2.50eV), preferably E LUMO (H BP ) ≤ -2.60 eV, comfortable, E LUMO (H BP ) ≤ -2.65eV, more preferably E LUMO (H BP LUMO energy E ) ≤ -2.70 eV LUMO (H BP ) has, (ii) -6.30eV or more (E HOMO (H BP )≧-6.30eV), preferably E HOMO (H BP )≧-5.90eV, comfortably, E HOMO (H BP )≧-5.70eV, more preferably E HOMO (H BP HOMO energy E ≥ -5.40 eV HOMO (H BP ) has.

[0172] Those skilled in the art know what materials are suitable host materials for use in the organic electroluminescent element 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.

[0173] 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.

[0174] In a preferred 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 P Includes. In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention is a single host material H B It contains only p-host H P That is the case.

[0175] 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 is a single host material H B It contains only n-host H N That is the case.

[0176] 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 Includes. In one embodiment of the present invention, each light-emitting layer B of the organic electroluminescent element according to the present invention is a single host material H B It contains only, and the host material is bipolar host H BP That is the case.

[0177] In another embodiment of the present invention, at least one light-emitting layer B of the organic electroluminescent element according to the present invention comprises at least two different host materials H B This includes one or more host materials H 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.

[0178] 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 made of one or more host materials H to which the above definition applies. B It 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 are not necessarily all made of the same material, or moreover, do not contain the same material in the same concentration or proportion.

[0179] When the light-emitting layer B of the organic electroluminescent element according to the present invention consists of one or more sublayers, any of these sublayers may be independent of the other one or more sublayers and consist of one or more host materials H to which the above definition applies. B It is understood that this includes [the specified material]. 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 moreover, the same material in the same concentration or proportion.

[0180] 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.

[0181] In a preferred embodiment of the present invention, at least one host material H B (For example, H P H N and / or H BP ) is an organic host material, which 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).

[0182] In one embodiment of the present invention, each host material H B p-host H P That is the case.

[0183] In one embodiment of the organic electroluminescent element according to the present invention, at least one, preferably each light-emitting layer B, each host material H B p-host H P That is the case.

[0184] 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 the following: 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 comprising or consisting of any one of X, and [ka] (Chemical formula H P -I) [ka] (Chemical formula H P -II) [ka] (Chemical formula H P -III) [ka] (Chemical formula H P -IV) [ka] (Chemical formula H P -V) [ka] (Chemical formula H P -VI) [ka] (Chemical formula H P -VII) [ka] (Chemical formula H P -VIII) [ka] (Chemical formula H P -IX) [ka] (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- Containing a structure consisting of any one of XIX, or one or more second chemical parts consisting of such structures, [ka] (Chemical formula H P -XI) [ka] (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 H P -XVII) [ka] (H P -XVIII) [ka] (Chemical formula H P -XIX) Here, the p-host material H P Each of the one or more second chemical parts present is connected to the first chemical part via a single bond represented by a dotted line in the chemical formula, Here, Z 1In 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 sites 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 a single bond bonding site 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, 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 monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, 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 XIX, but also adjacent substituents R IIThe fused ring system, composed of additional rings selectively formed by this process, contains a total of 8 to 60 carbon atoms, preferably 12 to 40 carbon atoms, and more preferably 14 to 32 carbon atoms.

[0185] 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 bond to form an additional ring system.

[0186] 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] In a preferred embodiment of the present invention, n-host H is selectively included in any one or more light-emitting layers B (consisting of one (sub)layer or including one or more sublayers) as a whole. N is the chemical formula H N -I, H N -II and H N -Includes or consists of a structure based on 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] (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] (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 binding site 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 monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems, and has 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, composed of additional rings selectively formed by the above, contains 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.

[0187] 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] 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).

[0188] Excitation energy transfer components EET-1 and EET-2 For each light-emitting layer B, at least one, preferably one or more small FWHM emitters S, are included in the same light-emitting layer B of the organic electroluminescent element according to the present invention. B To transfer excitation energy to the element, one or more excitation energy transfer components EET-1 and one or more excitation energy transfer components EET-2 are preferably selected.

[0189] In a preferred embodiment of the present invention, at least one, preferably within each light-emitting layer B, at least one, preferably each excitation energy transfer component EET-1 transfers the excitation energy to at least one, preferably each small FWHM emitter S B To transmit.

[0190] To enable such energy transfer, at least one, preferably, emission spectrum of each excitation energy transfer component EET-1 at room temperature (i.e., (about) 20°C) (e.g., TADF material E B The fluorescence spectrum of EET-1 as such, and at least one, preferably each small FWHM emitter S, from which EET-1 must transfer energy. BThere is spectral superposition between the absorption spectrum at room temperature (i.e., approximately 20°C). Therefore, in a preferred embodiment, at least one, preferably within each light-emitting layer B, there is spectral superposition between the emission spectrum at room temperature (i.e., approximately 20°C) of each excitation energy transfer component EET-1 and at least one, preferably within each small FWHM emitter S B There is spectral superposition between the absorption spectrum at room temperature (i.e., approximately 20°C). The absorption and emission spectra are recorded as described in the subchapter below.

[0191] In a preferred embodiment of the present invention, at least one, preferably within each light-emitting layer B, at least one, preferably each excitation energy transfer component EET-2 transfers the excitation energy to at least one, preferably each small FWHM emitter S B To transmit.

[0192] To enable such energy transfer, at least one, preferably, emission spectrum of each excitation energy transfer component EET-2 at room temperature (i.e., (about) 20°C) (e.g., TADF material E B The fluorescence spectrum of EET-2 as such, and at least one, preferably each small FWHM emitter S, from which EET-2 must transfer energy. B There is spectral superposition between the absorption spectrum at room temperature (i.e., approximately 20°C). Therefore, in a preferred embodiment, at least one, preferably within each light-emitting layer B, there is spectral superposition between the emission spectrum at room temperature (i.e., approximately 20°C) of each excitation energy transfer component EET-2 and at least one, preferably within each small FWHM emitter S B There is spectral superposition between the absorption spectrum at room temperature (i.e., approximately 20°C). The absorption and emission spectra are recorded as described in the subchapter below.

[0193] In a more preferred embodiment of the present invention, in each light-emitting layer B, not only is there at least one, preferably, each excitation energy transfer component EET-2 contained in the light-emitting layer B, but at least one, preferably, each excitation energy transfer component EET-1 is also present in at least one, preferably, each small FWHM emitter S B It transmits energy to it.

[0194] To enable such energy transfer, at least one, preferably, each excitation energy transfer component EET-2, as well as at least one, preferably, each excitation energy transfer component EET-1, has an emission spectrum at room temperature (i.e., (about) 20°C) (e.g., TADF material E B The fluorescence spectra of EET-1 and EET-2 respectively, and at least one, preferably each small FWHM emitter S, from which EET-1 and EET-2 must transfer energy. B There is spectral superposition between the absorption spectrum at room temperature (i.e., approximately 20°C) and the other spectrum.

[0195] Therefore, in a preferred embodiment of the present invention, at least one, preferably, within each light-emitting layer B, the following two conditions are met: (i) At least one, preferably, emission spectrum of each excitation energy transfer component EET-1 at room temperature (i.e., about 20°C), and at least one, preferably, each small FWHM emitter S B There is spectral overlap between the absorption spectrum at room temperature (i.e., approximately 20°C) and the other spectrum. (ii) At least one, preferably, emission spectrum of each excitation energy transfer component EET-2 at room temperature (i.e., about 20°C), and at least one, preferably, each small FWHM emitter S B There is spectral overlap between this and the absorption spectrum at room temperature (i.e., approximately 20°C). Here, the absorption and emission spectra are recorded as described in the subchapter following the main text.

[0196] Furthermore, specific embodiments of the present invention related to the aforementioned formulas (10), (11), (14), (15), and (16) provide guidance on how to select EET-1 and EET-2, so that the excitation energy can be set to at least one, preferably each small FWHM emitter S (included in the same light-emitting layer B). B This can be transmitted to. Therefore, in a preferred embodiment of the present invention, the relationships represented by formulas (10), (11), (14), (15), and (16) apply to the material contained in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0197] The excitation energy transfer components EET-1 and EET-2 are preferably capable of harvesting triplet excitons for photoemission from the singlet state. Those skilled in the art will understand this to mean that the excitation energy transfer components EET-1 and EET-2 exhibit strong spin-orbit coupling, for example, to efficiently transfer excitation energy from an excited triplet state to an excited singlet state. Alternatively, triplet harvesting by the excitation energy transfer components EET-1 and EET-2 can also be achieved by reverse intersystem crossing (RISC) to convert an excited triplet state to an excited singlet state (see below). In both cases, the excitation energy is transferred to at least one small FWHM emitter S B The exciton is transmitted to (preferably S1) from the excited singlet state. S It emits light.

[0198] In a preferred embodiment, at least one, preferably within each light-emitting layer B, the lowest empty orbital LUMO(EET-1) of each excitation energy transfer component EET-1 has an energy of less than -2.3 eV. LUMO (EET-1) has: E LUMO (EET-1) < -2.3 eV.

[0199] In other preferred embodiments, at least one, preferably within each light-emitting layer B, the lowest empty orbital LUMO(EET-1) of each excitation energy transfer component EET-1 has an energy of less than -2.6 eV. LUMO (EET-1) has: E LUMO (EET-1) < -2.6 eV.

[0200] In a preferred embodiment, at least one, preferably within each light-emitting layer B, the highest occupied orbital HOMO(EET-1) of each excitation energy transfer component EET-1 has an energy E higher than -6.3 eV. HOMO (EET-1) has: E HOMO (EET-1)>-6.3eV.

[0201] In a preferred embodiment, at least one, preferably, within each light-emitting layer B, the following two conditions are met: (i) At least one, preferably the lowest empty orbital LUMO(EET-1) of each excitation energy transfer component EET-1 has an energy of less than -2.6 eV. LUMO (EET-1) has: E LUMO (EET-1)<-2.6eV (ii) At least one, preferably, the highest occupied orbital HOMO(EET-1) of each excitation energy transfer component EET-1 has an energy E higher than -6.3 eV. HOMO (EET-1) has: E HOMO (EET-1)>-6.3eV.

[0202] In one embodiment of the present invention, in each light-emitting layer B, not only is there at least one, preferably, each excitation energy transfer component EET-2, but also at least one, preferably, each excitation energy transfer component EET-1 has an E(S1) of less than 0.4 eV, preferably less than 0.3 eV, more preferably less than 0.2 eV, even more preferably less than 0.1 eV, or more preferably less than 0.05 eV. EET-1 ) and E(T1 EET-1 The energy difference with ) and E(S1 EET-2 ) and E(T1 EET-2 ΔE corresponds to the energy difference with ) ST Show the value.

[0203] In addition to one or more excitation energy transfer components EET-1, one or more excitation energy transfer components EET-2 are present in the TADF material E B It is selected from the group consisting of the following.

[0204] As described above, in the context of the present invention, the light-emitting layer B comprises one or more excitation energy transfer components EET-1 and one or more excitation energy transfer components EET-2, where they are not identical (i.e., they do not have the same chemical formula). This is because, within each light-emitting layer B of the organic electroluminescent element according to the present invention, excitation energy transfer components EET-1 and EET-2 are, for example, independently of each other, TADF material E B This means that the selection is made from a group consisting of the following, but the chemical structures are not identical in any case. That is, within the luminescent layer B, EET-1 does not have the same chemical formula (or structure) as EET-2.

[0205] Excitation energy transfer components EET-1 and EET-2 are each TADF material E B If selected as such, TADF material E B Even if not shown for all specific embodiments that refer to TADF material E BIt should be understood that any preferred features, characteristics, and embodiments described later also apply to any excitation energy transfer component EET-1 or EET-2.

[0206] TADF material E B As is known to those skilled in the art, for example, in an organic light-emitting diode (OLED), the light emitted from the emitter material (i.e., the light-emitting dopant) includes fluorescence from an excited singlet state (generally the lowest excited singlet state S1) and phosphorescence from an excited triplet state (generally the lowest excited triplet state T1).

[0207] In the context of the present invention, a fluorescent emitter can emit light upon electronic excitation at room temperature (i.e., about 20°C) (for example, in an organic electroluminescent device), where the luminescent excited state is a singlet state (generally, the lowest excited singlet state S1). A fluorescent emitter generally exhibits immediate (i.e., direct) fluorescence on a nanosecond timescale when the initial electronic excitation (e.g., by electron-hole recombination) provides the excited singlet state of the emitter.

[0208] In the context of the present invention, a delayed fluorescence material is a material that can reach an excited singlet state (generally the lowest excited singlet state S1) from an excited triplet state (generally the lowest excited singlet state S1) via reverse intersystem crossing (RISC; i.e., up-system crossing or reverse intersystem crossing), and can emit light when returning from the excited singlet state (generally S1) to the electron bottom state. The timescale (generally in the microsecond range) at which fluorescence emission occurs after RISC from the excited triplet state (generally T1) to the excited singlet state (generally S1) is slower than the timescale (generally in the nanosecond range) at which direct (i.e., immediate) fluorescence occurs, and is therefore called delayed fluorescence (DF). When RISC from the excited triplet state (generally from T1) to the excited singlet state (generally up to S1) occurs via thermal activation, and the thus filled excited singlet state emits light (delayed fluorescence emission), the process is called thermally activated delayed fluorescence (TADF). Therefore, TADF materials are materials that can emit thermally activated delayed fluorescence (TADF) as described above. The energy difference ΔE between the lowest excited singlet state energy level E(S1) and the lowest excited triplet state energy level E(T1) of the fluorescent emitter. ST When ΔE decreases, the transition from the lowest excited triplet state to the lowest excited singlet state by RISC can occur with high efficiency. Therefore, TADF materials generally have a small ΔE. ST Having a value constitutes part of the general knowledge of those skilled in the art (see below).

[0209] The generation of (thermally activated) delayed fluorescence is analyzed, for example, based on decay curves obtained from time-resolved (i.e., transient) photoluminescence (PL) measurements. PL emission from TADF materials can be divided into two components: one from the excited singlet state (generally S1) generated by initial excitation, and another from the excited singlet state (generally S1) generated via RISC through the excited triplet state (generally T1). Generally, there is a considerable time difference between the emission from the excited singlet state (generally S1) formed by initial excitation and the emission from the excited singlet state (generally S1) reached via RISC from the excited triplet state (generally T1).

[0210] TADF materials are preferably related to full decay dynamics and satisfy the following two conditions: (i) Damping dynamics exhibit two time domains, one generally in the nanosecond (ns) range and the other generally in the microsecond (μs) range, and (ii) The morphology of the emission spectrum is identical in the two time domains. Here, some of the light emitted in the first decay region is considered immediate fluorescence, and some of the light emitted in the second decay region is considered delayed fluorescence. PL measurements can be performed using a spin-coated film of 1–10 wt%, particularly 10 wt%, of each emitter (i.e., assumed TADF material) in poly(methyl methacrylate) (PMMA).

[0211] To assess whether the preferred criterion (i) is met (i.e., the damping dynamics exhibit two time domains, one generally in the nanosecond (ns) range and the other generally in the microsecond (μs) range), TCSPC (Time-correlated single-photon counting) is commonly used (see below), and the overall damping dynamics are generally analyzed as described later. Alternatively, transient photoluminescence measurements using spectral resolution can be performed (see below).

[0212] To evaluate whether the preferred criterion (ii) is met (i.e., the morphology of the emission spectrum matches in two time domains), transient photoluminescence measurements using spectral resolution can commonly be performed (see below).

[0213] Experimental details regarding such measurements are provided in a subchapter following the main text.

[0214] The ratio of delayed fluorescence to immediate fluorescence (n-value) can be calculated by integrating the respective photoluminescence decay over time, as described in the subchapter below this text.

[0215] In the context of the present invention, the TADF material preferably exhibits an n value (i.e., the ratio of delayed fluorescence to immediate fluorescence) greater than 0.05 (n>0.05), more preferably greater than 0.15 (n>0.15), more preferably greater than 0.25 (n>0.25), more preferably greater than 0.35 (n>0.35), more preferably greater than 0.45 (n>0.45), more preferably greater than 0.55 (n>0.55), more preferably greater than 0.65 (n>0.65), more preferably greater than 0.75 (n>0.75), more preferably greater than 0.85 (n>0.85), or more preferably greater than 0.95 (n>0.95).

[0216] According to the present invention, a thermally activated delayed fluorescence (TADF) material E B The 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 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).

[0217] Preferably, in the context of the present invention, TADF material E B (Immediate fluorescence and (luminescence S1) E The status is T1 E Both exhibit delayed fluorescence (when accessed from the state via thermally activated RISC).

[0218] A small FWHM emitter S included 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.

[0219] 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 B This is at least one small FWHM emitter S B It can transfer energy to it.

[0220] 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, 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C). B Measurements are taken from spin-coated films.

[0221] In one embodiment of the present invention, 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, 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (about) 20°C). B Measurements are taken from spin-coated films.

[0222] In one embodiment of the present invention, TADF material E BIt has maximum emission in the green wavelength range of 480 nm to 560 nm, preferably 500 nm to 560 nm, and generally, 10 wt% of TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C). B Measurements are taken from spin-coated films.

[0223] In one embodiment of the present invention, 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., (approximately) 20°C). B Measurements are taken from spin-coated films.

[0224] In a preferred embodiment of the present invention, TADF material E B The maximum emission (peak emission) of the small FWHM emitter S in the context of this invention is B It is at a wavelength shorter than the maximum emission (peak emission).

[0225] 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).

[0226] In a preferred embodiment of the present invention, each TADF material E B It has a molecular weight of 800 g / mol or less.

[0227] In one embodiment of the present invention, TADF emitter E B Generally, 10 wt% TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C) BIt exhibits a photoluminescence quantum yield (PLQY) of over 30%, as measured from spin-coated films.

[0228] In a preferred embodiment of the present invention, TADF emitter E B Generally, 10 wt% TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C) B It exhibits a photoluminescence quantum yield (PLQY) of over 50%, as measured from spin-coated films.

[0229] In a more preferred embodiment of the present invention, TADF emitter E B Generally, 10 wt% TADF material E in poly(methyl methacrylate) PMMA at room temperature (i.e., (approximately) 20°C) B It exhibits a photoluminescence quantum yield (PLQY) of over 70%, as measured from spin-coated films.

[0230] In one embodiment of the present invention, 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%.

[0231] 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.

[0232] Generally, it can emit fluorescence and (thermally activated) delayed fluorescence, but the TADF material E is selectively included in the organic electroluminescent element of the present invention as the excitation energy transfer component EET-1 and / or EET-2. B It should be noted that, preferably, it primarily functions as an "energy pump" and does not function as an emitter material.

[0233] Those skilled in the art will know the TADF material (molecule) E according to the present invention. B The method for designing it and the typical structural characteristics of 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 the group to be large in volume or twisted and connected via spirojunctions, which reduces the spatial overlap of the HOMO and LUMO. However, minimizing the spatial overlap of the HOMO and LUMO has the disadvantage of also lowering the PLQY (Photoluminescence Quantum Yield) of the TADF material. Therefore, both of these effects must be considered in practice, and ΔE ST Reduce and achieve high PLQY.

[0234] One common approach to designing TADF materials is to co-deposition 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. B For 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.

[0235] 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).

[0236] Typical donor moieties include diphenylamine, carbazole, acridine, phenoxazine, and derivatives of related structures.

[0237] Benzene, biphenyl groups, and derivatives of terphenyl groups to a certain extent are common linker groups.

[0238] 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.

[0239] 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)).

[0240] 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.

[0241] 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-xanthene-9-one 10,10-dioxide).

[0242] 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.

[0243] 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. B It is known that skilled technicians are familiar with the design principles of such molecules and also know how to design such molecules that have a specific emission hue (e.g., blue, green, or red emission).

[0244] 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.

[0245] 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. It is understood that this does not mean that the present invention is limited to organic electroluminescent elements comprising TADF materials disclosed in the cited references. Any TADF material used in the latest technology may be a suitable TADF material in the context of the present invention. B It is understood that this is the case.

[0246] 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.

[0247] 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.

[0248] In one embodiment of the present invention, each TADF material E B It contains one or more selectively substituted 1,3,5-triazinyl groups.

[0249] In one embodiment of the present invention, each TADF material E BIt comprises one or more chemical moieties independently selected from amino groups, indolyls, carbazolyls, 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.

[0250] 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, indolyls, carbazolyls and their derivatives, each of which 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.

[0251] 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, indolyls, carbazolyls and their derivatives, each of which 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.

[0252] 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, indolyls, carbazolyls and their derivatives, each of which 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.

[0253] Those skilled in the art will understand that the expression "derivative" means that either the respective parent structure is selectively substituted, or any atom within the respective parent structure is replaced, for example, by an atom of another element.

[0254] 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 consisting of one of the 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 selective second chemical parts are covalently bonded to the third chemical part via a single bond. In the chemical formula DI, # indicates the single bond site that connects the first chemical part of each chemical formula DI to the third chemical part. Z 2 In each case, they are independent of each other, directly coupled, CR 1 R2 , 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 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 Alkoxy, This is 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 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 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 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 , 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 one or more substituents R 3 It is selectively replaced by and C3-C 60 Heteroaryl, This is 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 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 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 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 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 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 one or more substituents R 4 It is selectively replaced by and C3-C 57 Heteroaryl, This is 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 R is 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, form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic system. R 4 In each case, a group consisting of the following is selected: 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), 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), R6 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 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 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 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 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 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 , 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 one or more substituents R 9 It is selectively replaced by and C3-C 60 Heteroaryl, This is one or more substituents R 9 It is selectively replaced by, R 9Each 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 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 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 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 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 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 , 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 one or more substituents R 10 It is selectively replaced by and C3-C 60 Heteroaryl, This is 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) Here, RX R 6 It is defined as follows, however, in chemical formula EWG-I, at least one R X The base is CN or CF3, In chemical formulas A-IV, two adjacent groups R 8 It selectively forms aromatic rings, which are condensed into a structure of chemical formula A-IV, where the selectively formed condensed ring system 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 11 In each case, these are either single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently 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.

[0255] 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 2Selected 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 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 one or more substituents R 3 It is selectively replaced by and C3-C 60 Heteroaryl, This is 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 one or more substituents R 4 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R4 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 one or more substituents R 4 It is selectively replaced by and C3-C 57 Heteroaryl, This is 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 R is 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, form a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic system. R 4 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 17Heteroaryl, 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 40Alkyl, This is 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 one or more substituents R 9 It is selectively replaced by and C3-C 60 Heteroaryl, This is 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 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 60Ariel, This is one or more substituents R 10 It is selectively replaced by and C3-C 60 Heteroaryl, This is 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, In chemical formulas A-IV, two adjacent groups R 8It 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 system thus selectively formed contains 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 single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently 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 attached to the third chemical part is the number of available bonding sites in the third chemical part (i.e., substituent R 11 The number of TADF materials E is limited only by the aforementioned provisions, and each TADF material E B It comprises at least one first chemical part, at least one second chemical part, and exactly one third chemical part.

[0256] 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 R2 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 one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 3 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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 one or more substituents R 4 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 4 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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 and R 3 R is independent of each other.a , R b , R d , R 1 , R 2 and R 3 Together with one or more adjacent substituents selected from, a monocyclic or polycyclic, aliphatic or aromatic, carbocyclic or heterocyclic 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 6and 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 one or more substituents R 9 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 9 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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 one or more substituents R 10 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 10 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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 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, In chemical formulas A-IV, two adjacent groups R 8 It selectively forms aromatic rings, which are condensed into a structure of chemical formula A-IV, where the selectively formed condensed ring system contains 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 single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently 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.

[0257] 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 one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 3 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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 R is independent of each other. a , R b , R d , R 1 and R 2Together with one or more adjacent substituents selected from, a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic system is formed, where the fused ring system, consisting of the structure of chemical formula D-1 and the attached rings formed by adjacent substituents, comprises a total of 13 to 40 ring atoms, preferably 13 to 30 ring atoms, more 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 one or more substituents R 9 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 9 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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, In chemical formulas A-IV, two adjacent groups R 8 It selectively forms aromatic rings, which are condensed into a structure of chemical formula A-IV, where the selectively formed condensed ring system contains 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 single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently 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.

[0258] 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 replaced by Bu and Ph, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Carbazolyl substituted with Bu and Ph, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Triazinyl substituted with Bu and Ph, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, t Pyrimidinyl substituted with Bu and Ph, One or more hydrogen atoms selectively and independently form deuterium, Me, i Pr, tPyridinyl substituted with 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 one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 3 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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 R is independent of each other. a , R b , R d , R 1 and R 2Together with one or more adjacent substituents selected from, a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic system is formed, where the fused ring system, consisting of the structure of chemical formula D-1 and the attached rings formed by adjacent substituents, comprises a total of 13 to 40 ring atoms, preferably 13 to 30 ring atoms, more 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 one or more substituents R 9 It is selectively replaced by, C6-C 18 Ariel, This is one or more substituents R 9 It is selectively replaced by and C3-C 17 Heteroaryl, This is 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, In chemical formulas A-IV, two adjacent groups R 8 It selectively forms aromatic rings, which are condensed into a structure of chemical formula A-IV, where the selectively formed condensed ring system contains 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, provided that there is at least one Q 3 It is nitrogen (N), R 11 In each case, these are either single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, tBu, 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.

[0259] 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 one or more substituents R 3 It is selectively replaced by, C6-C 18 Ariel, This is 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 R is independent of each other. a , R b , R d , R 1 and R 2 Together with one or more adjacent substituents selected from, a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic system is formed, where the fused ring system, consisting of the structure of chemical formula D-1 and the attached rings formed by adjacent substituents, comprises a total of 13 to 40 ring atoms, preferably 13 to 30 ring atoms, more 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 replaced by Bu and Ph, 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, 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 system thus selectively formed contains 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 Q3 It is nitrogen (N), R 11 In each case, these are either single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently 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, t Ph replaced by Bu and Ph, R 12 R 6 It is defined as follows.

[0260] 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 R is independent of each other. a , R b , R d , R 1 and R 2 Together with one or more adjacent substituents selected from, a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic system is formed, where the fused ring system, consisting of the structure of chemical formula D-1 and the attached rings formed by adjacent substituents, comprises a total of 13 to 40 ring atoms, preferably 13 to 30 ring atoms, more 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 2Both 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 replaced by Bu and Ph, 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, In chemical formulas A-IV, two adjacent groups R 8 It selectively forms aromatic rings, which are condensed into a structure of chemical formula A-IV, where the selectively formed condensed ring system contains 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 single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently from the group consisting of the following: Hydrogen, deuterium, Me, i Pr, tBu, 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.

[0261] 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 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, 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 R is independent of each other. a , R b , R d , R 1 and R 2Together with one or more adjacent substituents selected from, a monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic system is formed, where the fused ring system, consisting of the structure of chemical formula D-1 and the attached rings formed by adjacent substituents, comprises a total of 13 to 40 ring atoms, preferably 13 to 30 ring atoms, more 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, 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, 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 system thus selectively formed contains 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 single bond sites that independently link the first or second chemical part to the third chemical part, or they are selected independently 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 replaced by Bu and Ph, R 12 R 6 It is defined as follows.

[0262] In a preferred embodiment of the present invention, a is always 1 and b is always 0.

[0263] In a preferred embodiment of the present invention, Z 2 In each case, it is a direct join.

[0264] In a preferred embodiment of the present invention, R a In each case, it is hydrogen.

[0265] In a preferred embodiment of the present invention, R a and R d In each case, it is hydrogen.

[0266] In a preferred embodiment of the present invention, Q 3 In each case, it is nitrogen (N).

[0267] In one embodiment of the present invention, in the chemical formula EWG-I, at least one group R X is CN.

[0268] In a preferred embodiment of the present invention, in the chemical formula EWG-I, exactly one group R X is CN.

[0269] 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.

[0270] 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] JPEG0007844450000076.jpg33146 [ka] [ka] [ka] [ka] Here, the aforementioned definition applies.

[0271] 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] JPEG0007844450000082.jpg47144 [ka] [ka] [ka] [ka] [ka] [ka] JPEG0007844450000089.jpg19145 [ka] Here, the aforementioned definition applies.

[0272] 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 13This is not a single bond bonding site 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 consists 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 BN The base is hydrogen (H) in both cases. The definitions mentioned above apply to all other cases.

[0273] In a preferred embodiment of the present invention, R 13 In each case, it is hydrogen.

[0274] In one embodiment of the present invention, R Y In each case, it is CN.

[0275] In one embodiment of the present invention, R Y In each case, it is CF3.

[0276] In one embodiment of the present invention, R Y In each case, the structure is represented by the chemical formula BN-I.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] TADF material E for use in organic electroluminescent elements according to the present invention B Examples are shown below, but this is merely an example of a suitable TADF material E in the context of the present invention. B That does not mean...

[0281] Chemical formula E B -I TADF material E B An unrestrictive example is shown below: [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] Chemical formula E B -II TADF material E B An unrestrictive example is shown below: [ka] [ka] [ka] [ka] [ka] Chemical formula E B -III TADF material E B An unrestrictive example is shown below: [ka] [ka] [ka] [ka] Chemical formula E B - TADF material E by IV B An unrestrictive example is shown below: [ka] Chemical formula E B -V TADF material E B An unrestrictive example is shown below: [ka] Chemical formula E B -VI-based TADF material E B An unrestrictive example is shown below: [ka] Chemical formula E B -VII TADF material E B An unrestrictive example is shown below: [ka] Chemical formula E B -TADF material E by VIII B An unrestrictive example is shown below: [ka] Chemical formula E B - TADF material E by IX B An unrestrictive example is shown below: [ka] [ka] Chemical formula E B -X-based TADF material E B An unrestrictive example is shown below: [ka] [ka] Chemical formula E B - TADF material E by XI B An unrestrictive example is shown below: [ka] TADF material E B The synthesis is achieved by skilled technicians through standard reactions and reaction conditions well known to them. 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] 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 The ring can be formed, for example, to provide pinacol boronic acid ester. 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 such a palladium-catalyzed coupling reaction are known to those skilled in the art, for example from WO2017 / 005699, and it is known that the reactants of E1 and E2 are interchangeable as shown below to optimize the reaction yield: [ka] 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).

[0282] [ka] 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).

[0283] As an alternative, halogen-substituted carbazoles, particularly 3-bromocarbazole, can also be used as E4.

[0284] In subsequent reactions, a boronic acid ester group or boronic acid group is exemplary introduced at the position of one or more halogen substituents introduced via E4, and a corresponding carbazolylboronic acid or ester, such as carbazole-3-yl-boronic acid ester or carbazole-3-yl-boronic acid, can be produced, for example, through a reaction with (pinacolate)diborone (CAS No. 73183-34-3). Then, the corresponding halogenated reaction product, 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 This could be introduced.

[0285] 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 This could be introduced.

[0286] 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.

[0287] An alternative synthetic route also involves introducing a nitrogen heterocycle into an aryl halide or aryl pseudohalide, preferably aryl bromide, aryl iodide, aryl triflate, or aryl tosylate, via copper or palladium-catalyzed coupling.

[0288] Selective phosphorescent material PB In the context of the present invention, phosphorescent material P B This method utilizes intramolecular spin-orbit interaction (heavy atom effect) induced by metal atoms to obtain light emission from the triplet state (i.e., the excited triplet state, generally the lowest excited triplet state T1). In other words, phosphorescent material P B It can emit phosphorescence at room temperature (i.e., about 20°C), and this is generally due to 10% by weight of P in poly(methyl methacrylate) (PMMA). B It is measured from the spin-coated film.

[0289] Phosphorescent material P, which can emit phosphorescence by definition, is selectively included in the organic electroluminescent element of the present invention. B Preferably, it functions as an "energy pump" that is not primarily an emitter material. That is, the phosphorescent material P contained in the light-emitting layer B B This mainly involves small FWHM emitters S with excitation energies of 1 or more. B They are then transmitted to, and subsequently, they act as the main emitter material. Phosphorescent material P in light-emitting layer B B It is preferable that its primary function is not to emit light. However, it can emit light to some extent.

[0290] 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.

[0291] Phosphorescent material P used in organic electroluminescent elements BIt is common knowledge to those skilled in the art that the phosphorescent material is a complex of Ir, Pd, Pt, Au, Os, Eu, Ru, Re, Ag, and Cu, preferably Ir, Pt, and Pd, and more preferably Ir and Pt, in the context of this invention. Skilled technicians know which materials are suitable as phosphorescent materials in organic electroluminescent devices and how to synthesize them. Skilled technicians are also familiar with the design principles of phosphorescent complexes for use in organic electroluminescent devices and know how to adjust the luminescence of complexes through structural changes.

[0292] 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.

[0293] For example, US2020274081(A1), US20010019782(A1), US20020034656(A1), US20030138657(A1), US2005123791(A1), US20060065890(A1), US20060134462(A1), US20070034863(A1), US20070111026(A1), US2007034863(A1), US2007138437(A1), US20080020237(A1), US20080297033(A1), US2008210930( A1), US20090115322(A1), US2009104472(A1), US20100244004(A1), US201 0105902(A1), US20110057559(A1), US2011215710(A1), US2012292601(A1 ), US2013165653(A1), US20140246656(A1), US20030068526(A1), US20050 123788(A1), US2005260449(A1), US20060127696(A1), US20060202194(A1 ), US20070087321(A1), US20070190359(A1), US2007104979(A1), US2007224450(A1), US20080233410(A1), US200805851(A1), US20090039776(A1) , US20090179555(A1), US20100090591(A1), US20100295032(A1), US20030 072964(A1), US20050244673(A1), US20060008670(A1), US20060134459(A 1), US20060251923(A1), US20070103060(A1), US20070231600(A1), US200 7104980(A1), US2007278936(A1), US20080261076(A1), US2008161567(A1 ), US20090108737(A1), US2009085476(A1), US20100148663(A1), US20101 02716(A1), US2010270916(A1), US20110204333(A1), US2011285275(A1),US2013033172(A1), US2013334521(A1), US2014103305(A1), US2003068536(A1), US2003085646(A1), US2006228581(A1), US2006197077(A1), US2011114922(A1), US2011114922(A1), US2003054198(A1), and EP2730583(A1) 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.

[0294] 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.

[0295] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] As mentioned above, skilled technicians can determine that any phosphorescent complex used in the latest technology is a phosphorescent material P in the context of the present invention. B They will recognize that it is suitable for that purpose.

[0296] In one embodiment of the present invention, each phosphorescent material P contained in the light-emitting layer B B It contains iridium (Ir).

[0297] In one embodiment of the present invention, at least one phosphorescent material P B Preferably, each phosphorescent material P contained in the light-emitting layer B B It is an organometallic complex containing iridium (Ir) or platinum (Pt).

[0298] In one embodiment of the present invention, at least one phosphorescent material P is included in the light-emitting layer B. B Preferably, each phosphorescent material P B It is an organometallic complex containing iridium (Ir).

[0299] In one embodiment of the present invention, at least one phosphorescent material P is included in the light-emitting layer B. B Preferably, each phosphorescent material P B It is an organometallic complex containing platinum (Pt).

[0300] Also, phosphorescent material P B An unrestrictive example is the following general chemical formula P B Includes compounds represented by -I: [ka] (Chemical formula P B -I).

[0301] 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 between 1 and 3. X 2 and Y 1 In each case, they independently form bidentate monoanionic ligands.

[0302] In one embodiment of the present invention, each phosphorescent material P contained in the light-emitting layer B B The chemical formula P is as follows: B -Includes or consists 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 between 1 and 3. X 2 and Y 1 In each case, they independently form bidentate monoanionic ligands.

[0303] Chemical formula P B Examples of compounds represented by -I are shown below with chemical formula P B -II or 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.

[0304] 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 B In -III, M is preferably Ir from the viewpoint of high efficiency and long lifespan.

[0305] 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 with.

[0306] 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 It is also a C1-C5 heteroaryl that is substituted.

[0307] 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, Z 3 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.

[0308] 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 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 one or more substituents R 5E Selectively substituted, where one or more non-adjacent CH2 groups are R 5EC=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 one or more substituents R 5E It is selectively replaced by and C3-C 57 Heteroaryl, This is one or more substituents R 5E It is selectively replaced by [this].

[0309] 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 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 one or more substituents R 6E It is selectively replaced by and C3-C 57 Heteroaryl, This is one or more substituents R 6E It is selectively replaced by [this].

[0310] 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).

[0311] 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, or heteroaromatic ring systems.

[0312] Chemical formula P BNon-restrictive examples 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, fa c-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.

[0313] Chemical formula P B Other non-restrictive 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.

[0314] [ka] [ka] [ka] Chemical formula P B Other non-restrictive examples of compounds represented by -III are shown below, under 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.

[0315] [ka] 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.

[0316] Exciplex It has been demonstrated that TADF materials can convert an excited triplet state (preferably T1) to an excited singlet state (preferably S1) via reverse intersystem crossing (RISC). Furthermore, this generally results in a small ΔE ST A value is required, which is by definition TADF material E B In this case, it has been explicitly stated that it is less than 0.4 eV. Also, as mentioned above, this is because the TADF molecule E is spatially separated so that the HOMO and LUMO are largely separated by the (electron) donor group and (electron) acceptor group, respectively. B This is achieved by designing ΔE ST Another strategy for reaching species with small values ​​is to form an exciplex. As those skilled in the art know, an exciplex is an excited-state charge transfer complex (i.e., an excited-state donor-acceptor complex) formed between a donor molecule and an acceptor molecule. Those skilled in the art will know that in an exciplex, the spatial separation of the HOMO (on the donor molecule) and the LUMO (on the acceptor molecule) is typically somewhat small ΔE. ST It is understood that the excited triplet state (preferably T1) can be switched to the excited singlet state (preferably S1) via reverse intersystem crossing (RISC) by having a value.

[0317] In fact, as is known to those skilled in the art, TADF materials are not materials that have TADF follow-up emission, but are simply RISC-transferable from an excited triplet state to an excited singlet state on their own, as described above. Furthermore, TADF materials consist of virtually two materials, preferably two host materials H B More preferably, p-host material H P and n-host material H N It is well known to those skilled in the art that the exciplex is formed from (see below), and the host material H B (Generally, H P and H N It is understood that the material itself is TADF material.

[0318] Those skilled in the art will understand that not only any material contained in the same layer, particularly in the same EML, but also materials contained in adjacent layers and in very close proximity at the interface between those adjacent layers can form an exciplex together. Those skilled in the art will understand that pairs of materials forming an exciplex, particularly p-host H P and n-host H N A method for selecting a pair of materials, and selection criteria including HOMO and / or LUMO energy level requirements for the two components of the pair of materials, are known. That is, when exciplex formation is required, one component, for example, p-host material H P The highest occupied orbital (HOMO) of the n-host material H is the highest occupied orbital of the other component, for example, the n-host material H N The energy of the HOMO is at least 0.20 eV higher, and one component, for example, p-host material H P The lowest unoccupied orbital (LUMO) is the other component, for example, the n-host material H N Its energy is at least 0.20 eV higher than the LUMO.

[0319] It is common knowledge to those skilled in the art that when an exciplex is present in an organic electroluminescent device, particularly an OLED EML, the exciplex functions as an emitter material and can emit light when voltage and current are applied to the device. As is known from the latest technology and generally, the exciplex is non-radiative and, for example, when included in the EML of an organic electroluminescent device, can transfer excitation energy to the emitter material. Therefore, an exciplex that can be switched from an excited triplet state to an excited singlet state by RISC can also be used as excitation energy transfer components EET-1 and / or EET-2.

[0320] Host material H capable of forming an exciplex together B An unrestrictive example is shown below, where the donor molecule (i.e., p-host H) is the host molecule. P ) is selected from the following structures: [ka] Acceptor molecule (i.e., n-host H) N ) is selected from the following structures: [ka] [ka] [ka] [ka]

[0321] In the context of the present invention, the exciplex is any material included in the light-emitting layer B, for example, not only different excitation energy transfer components (EET-1 and / or EET-2), but also the excitation energy transfer components (EET-1 and / or EET-2) and a small FWHM emitter S B , or host material H B and excitation energy transfer component EET-1 or EET-2 or small FWHM emitter S B It is understood that they are formed from different host materials H as described above. Preferably, however, they are different host materials H B It is formed from this. It is also understood that an exciplex is formed, and the excitation energy transfer components (EET-1 and / or EET-2) themselves may not act.

[0322] Small FWHM emitter S B The present invention provides a small half-width (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].

[0323] In a preferred embodiment of the present invention, a small FWHM emitter S B This is 1 to 5% by weight, especially 2% by weight, of emitter S in PMMA at room temperature (i.e., (approximately) 20°C). 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 BThe 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 following. In another embodiment of the present invention, each small FWHM emitter S B This indicates FWHM for ≤0.19eV, ≤0.18eV, ≤0.17eV, ≤0.16eV, ≤0.15eV, ≤0.14eV, ≤0.13eV, ≤0.12eV, or ≤0.11eV.

[0324] In one embodiment of the present invention, each small FWHM emitter S B This is achieved at room temperature with (1 to 5% by weight, especially 2% by weight of emitter S B When measured with PMMA, it emits maximum emission in the wavelength range of 440 nm to 470 nm.

[0325] In one embodiment of the present invention, each small FWHM emitter S B This is achieved at room temperature with (1 to 5% by weight, especially 2% by weight of emitter S B When measured with PMMA, it emits light at its maximum emission in the wavelength range of 500 nm to 560 nm.

[0326] In one embodiment of the present invention, each small FWHM emitter S B This is achieved at room temperature with (1 to 5% by weight, especially 2% by weight of emitter S B When measured with PMMA, it emits light at its maximum emission in the wavelength range of 610 nm to 665 nm.

[0327] 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 light at its maximum emission in the wavelength range of 440 nm to 470 nm.

[0328] In one embodiment of the present invention, each small FWHM emitter S BThis 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 light at its maximum emission in the wavelength range of 500 nm to 560 nm.

[0329] 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 light at its maximum emission in the wavelength range of 610 nm to 665 nm.

[0330] 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).

[0331] In one embodiment of the present invention, one of the relationships represented by the following formulas (29) to (31) applies: 440nm<λ max (S B )<470nm (29) 510nm<λ max (S B )<550nm (30) 610nm<λ max (S B )<665nm (31) Here, .'' max (S B ) is a small FWHM emitter S in the context of the present invention. B This shows the maximum light emission.

[0332] In one embodiment, the aforementioned relationships represented by formulas (29) to (31) apply to materials included in any one or more light-emitting layers B of the organic electroluminescent element according to the present invention. In one embodiment, the aforementioned relationships represented by formulas (29) to (31) apply to materials included in the same light-emitting layer B of the organic electroluminescent element according to the present invention.

[0333] 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).

[0334] 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.

[0335] In one embodiment of the present invention, a small FWHM emitter S B This is achieved at room temperature with (1 to 5% by weight, especially 2% by weight of emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of 50% or more.

[0336] In a preferred embodiment of the present invention, a small FWHM emitter S B This is achieved at room temperature with (1 to 5% by weight, especially 2% by weight of emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of 60% or higher.

[0337] In a more preferred embodiment of the present invention, a small FWHM emitter S BThis is achieved at room temperature with (1 to 5% by weight, especially 2% by weight of emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of 70% or higher.

[0338] 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% by weight, especially 2% by weight of emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of over 80%.

[0339] 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% by weight, especially 2% by weight of emitter S B When measured with PMMA, it exhibits a photoluminescence quantum yield (PLQY) of over 90%.

[0340] 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.

[0341] 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.

[0342] 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%.

[0343] 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%.

[0344] 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%.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] Furthermore, skilled technicians understand that the BODIPY basic structure shown below is: JPEG0007844450000158.jpg1925 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.

[0349] 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 aromatics or heteroaromatics, all of which can be selectively substituted. The selection of suitable substituents in the BODIPY core is obvious to a skilled technician 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.

[0350] 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.

[0351] 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] This is because a BODIPY derivative having different structural characteristics than 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 with small FWHM emitters S according to the present invention. B But so.

[0352] Furthermore, it is known to those skilled in the art that an emitter for an organic electroluminescent device can be obtained by replacing one or both of the fluorine substituents attached to the central boron atom of the BODIPY core structure with an alkoxy or aryloxy group attached via an oxygen atom and selectively substituted with an electron-withdrawing substituent such as fluorine (F) or trifluoromethyl (CF3). Such molecules are disclosed, for example, in US2012037890(A1), and those skilled in the art will know that such a BODIPY-related compound is a suitable small FWHM emitter S 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] 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].

[0353] 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.

[0354] 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.

[0355] 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.

[0356] A skilled technician can identify a small FWHM emitter S in the context of the present invention. 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.

[0357] 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.

[0358] 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 consisting 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-C 40 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 CONRDABNA-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 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)(RDABNA-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-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 condensed to adjacent rings A', B', or C', where the selectively formed condensed ring systems (i.e., each ring A', B', or C' and the additional rings selectively condensed thereto) contain 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 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 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)(RDABNA-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 , SR DABNA-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 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 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-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-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. R DABNA-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 Y b one of the above, 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(RDABNA-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-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 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-6However, 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] In a preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, one or more small FWHM emitters S B This includes or consists of a structure with the chemical formula DABNA-I, where A', B', and C' are all aromatic rings (i.e., all benzene rings) each having six ring atoms.

[0364] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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.

[0365] In a preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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.

[0366] In a more preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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 And selected from O.

[0367] In a particularly preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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.

[0368] In a particularly preferred embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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 identical and independent of each other, and both are NR DABNA-3 That is the case.

[0369] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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 , 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 ring selectively fused to it) contain a total of 8 to 30 ring atoms.

[0370] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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 , 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-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 ring selectively fused to it) contain a total of 8 to 30 ring atoms.

[0371] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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 ring selectively condensed to it) contain a total of 8 to 30 ring atoms.

[0372] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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(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, becoming 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.

[0373] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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(Ph)2, Me, i Pr, t Bu, Ph, Here, one or more hydrogen atoms are selectively and independently of each other, becoming 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, becoming 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, becoming 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, becoming 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, becoming 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.

[0374] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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'.

[0375] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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 18 Ariel, 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, becoming 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, becoming 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.

[0376] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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, becoming deuterium, Me, i Pr, tReplaced by Bu, Ph, or CN C3-C 17 Heteroaryl, Here, one or more hydrogen atoms are selectively and independently of each other, becoming 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.

[0377] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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, 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, becoming 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, becoming 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.

[0378] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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 C6-C 18 Ariel, Here, one or more hydrogen atoms are selectively and independently of each other, becoming 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.

[0379] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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, Me, i Pr, t Bu, and Ph, Here, one or more hydrogen atoms are selectively and independently of each other, becoming 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.

[0380] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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, 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).

[0381] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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.

[0382] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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.

[0383] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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, 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.

[0384] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, one or more small FWHM emitters S B This includes or consists 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-3This 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 ).

[0385] In one embodiment, a small FWHM emitter S in the context of the present invention B These 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 are, for example, conjugable and preferably condensable (i.e., sharing at least one bond, where there are no further substituents attached to the atoms forming that bond). Furthermore, two or more subunits may share at least one, preferably exactly one, aromatic 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 BThis molecule has only one covalent ring 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 sharing one or more rings. Preferably, the polymer is a dimer containing two subunits, each having the structure of the chemical formula DABNA-I.

[0386] 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.

[0387] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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-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 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).

[0388] In one embodiment of the present invention, at least one, preferably, in each light-emitting layer B, at least one, preferably, 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, R DABNA-1 , R DABNA-2 , R DABNA-3 , R DABNA-4 , R DABNA-5 and R DABNA-6 At 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.

[0389] The small FWHM emitter S according to the present invention B An unrestricted example of an emitter containing or consisting of a structure with the chemical formula DABNA-I, which can be used as such, is shown below: [ka] [ka]

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[0390] Small FWHM emitter S in the context of the present invention B A group of emitters usable as such are emitters containing or consisting of the structure or polymer thereof, as shown in the following chemical formula BNE-1: [ka] (Chemical formula BNE-1) Here, c and d are both integers, independently selected from 0 and 1. e and f are both integers, chosen from 0 and 1, where e and f are (always) identical (i.e., both are 0 or both are 1). g and h are both integers, chosen from 0 and 1, where g and h are (always) identical (i.e., both are 0 or both are 1). If d is 0, then both e and f are 1, and if d is 1, then both e and f are 0. If c is 0, then both g and h are 1, and if c is 1, then both g and h are 0. V 1 It is nitrogen (N) and CR BNE-V Selected from, V 2 It is nitrogen (N) and CR BNE-I Selected from, X 3 This is direct bonding, CR BNE-3 R BNE-4 , C=CR BNE-3 R BNE-4 , C=O, C=NR BNE-3 , NR BNE-3 , O, SiR BNE-3 R BNE-4 Selected from the group consisting of S, S(O), and S(O)2, Y 2 This is direct bonding, CR BNE-3’ R BNE-4’ , C=CR BNE-3’ R BNE-4’, C=O, C=NR BNE-3’ , NR BNE-3’ , O, SiR BNE-3’ R BNE-4’ Selected from the group consisting of S, S(O), and S(O)2, 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 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 Replaced by, C1-C 40 Alkoxy, This is 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(RBNE-5 )2, C=O, C=S, C=Se, C=NR BNE-5 , P(=O)(R BNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced by, C1-C 40 Thioalkoxy, This is 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 Replaced by, C2-C 40 Alkenil, This is 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 Replaced by, C2-C 40 Alkinil, This is 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 Replaced by, C6-C 60 Ariel, This is one or more substituents R BNE-5 It is selectively replaced by and C2-C 57 Heteroaryl, This is 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, 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 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 Replaced by, C1-C 40 Alkoxy, This is 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 Replaced by, C1-C 40 Thioalkoxy, This is 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 Replaced by, C2-C 40 Alkenil, This is 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 Replaced by, C2-C 40 Alkinil, This is 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)(RBNE-5 ), SO, SO2, NR BNE-5 , O, S or CONR BNE-5 Replaced by, C6-C 60 Ariel, This is one or more substituents R BNE-a It is selectively replaced by and C2-C 57 Heteroaryl, This is 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, 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 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 Replaced by, C1-C 40 Alkoxy, This is 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 Replaced by, C1-C 40 Thioalkoxy, This is 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 Replaced by, C2-C 40 Alkenil, This is 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 Replaced by, C2-C 40 Alkinil, This is 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 Replaced by, C6-C 60 Ariel, This is one or more substituents R BNE-5 It is selectively replaced by and C2-C 57 Heteroaryl, This is one or more substituents R BNE-5 It is selectively replaced by, R BNE-5 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) BNE-6 )2, OR BNE-6 , Si(R BNE-6 )3, B(OR BNE-6 )2, B(R BNE-6 )2, OSO2R BNE-6 ,CF3,CN,F,Cl,Br,I, C1-C 40 Alkyl, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced by, C1-C 40 Alkoxy, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NRBNE-6 , O, S or CONR BNE-6 Replaced by, C1-C 40 Thioalkoxy, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced by, C2-C 40 Alkenil, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced by, C2-C 40 Alkinil, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 Replaced by, C6-C 60 Ariel, This is one or more substituents R BNE-6 It is selectively replaced by and C2-C 57 Heteroaryl, This is one or more substituents R BNE-6 It is selectively replaced by, R BNE-6 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 with deuterium, CN, CF3, Ph, or F. C1-C5 alkoxy, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C1-C5 thioalkoxy, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C2-C5 alkenyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C2-C5 alkynyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C6-C 18 Ariel, This is selectively substituted with one or more C1-C5 alkyl substituents, C2-C 17 Heteroaryl, This is selectively substituted with one or more C1-C5 alkyl substituents, N(C6-C 18 Ariel) 2, N(C2-C 17 Heteroaryl)2, and N(C2-C 17 (Heteroaryl)(C6-C 18 Ariel), Here, R BNE-III and R BNE-e It selectively binds to form a single bond directly. Here, substituent R BNE-a , R BNE-d , R BNE-d’ , R BNE-e , R BNE-3’ , R BNE-4’ and R BNE-5 Two or more of these elements selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with each other. Here, substituent R BNE-1 , R BNE-2 , R BNE-1’ , R BNE-2’ , R BNE-3 , R BNE-4 , R BNE-5 , R BNE-I , R BNE-II , R BNE-III , R BNE-IV and R BNE-V Two or more of these elements selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with each other. Here, two or more structures of chemical formula BNE-1 are selectively joined to each other, preferably condensed by sharing at least one, more preferably exactly one bond. Here, two or more structures of chemical formula BNE-1 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 two structures of chemical formula BNE-1), which is preferably one of rings a, b, and c' of chemical formula BNE-1, but R BNE-1 , R BNE-2 , R BNE-1’ , R BNE-2’ , R BNE-3 , R BNE-4 , R BNE-3’ , R BNE-4’ , R BNE-5 , R BNE-6 , R BNE-I , R BNE-II , R BNE-III , R BNE-IV , R BNE-V , RBNE-a , R BNE-e , R BNE-d and R BNE-d’ 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 substituents as described above, where the covalent ring may constitute identical or distinct parts of two or more structures of chemical formula BNE-1 that share the ring (i.e., the covalent ring may be, for example, ring c' of two structures of chemical formula BNE-1 selectively contained in the emitter, or the covalent ring may be, for example, ring b of one structure of chemical formula BNE-1 and ring c' of the other structure selectively contained in the emitter). Here, selectively, R BNE-1 , R BNE-2 , R BNE-1’ , R BNE-2’ , R BNE-3 , R BNE-4 , R BNE-5 , R BNE-3’ , R BNE-4’ , R BNE-6 , R BNE-I , R BNE-II , R BNE-III , R BNE-IV , R BNE-V , R BNE-a , R BNE-e , R BNE-d or R BNE-d’ At least one of these is replaced by a bond to a further chemical entity of chemical formula BNE-1, and / or R BNE-1 , R BNE-2 , R BNE-1’ , R BNE-2’ , R BNE-3 , R BNE-4 , R BNE-5 , R BNE-3’ , R BNE-4’ , R BNE-6 , R BNE-I , R BNE-II , R BNE-III , R BNE-IV , R BNE-V , R BNE-a , R BNE-e , R BNE-d or R BNE-d’ At least one hydrogen atom from any one of these is replaced by a bond to a further chemical entity of the chemical formula BNE-1.

[0391] 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 BNE-1.

[0392] 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 BNE-1.

[0393] 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 BNE-1.

[0394] 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 BNE-1.

[0395] 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 these, preferably each, contains or consists of a structure with the chemical formula BNE-1, and V 1 CR BNE-V V 2 CR BNE-I That is the case.

[0396] 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 these, preferably each, contains or consists of a structure with the chemical formula BNE-1, and V 1 and V 2 Both are nitrogen (N).

[0397] 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 these, preferably each, contains or consists of a structure with the chemical formula BNE-1, and V 1 is nitrogen (N), and V 2 CR BNE-I That is the case.

[0398] 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 these, preferably each, contains or consists of a structure with the chemical formula BNE-1, and V 1 CR BNE-V V 2 It is nitrogen (N).

[0399] 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 these, preferably each, contains or consists of a structure according to the chemical formula BNE-1, where both c and d are 0.

[0400] 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 these, preferably each, contains or consists of a structure according to the chemical formula BNE-1, where c is 0 and d is 1.

[0401] 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 these, preferably each, contains or consists of a structure according to the chemical formula BNE-1, where c is 1 and d is 0.

[0402] In one embodiment of the present invention, at least one, preferably one or more, small FWHM emitters S B It contains or consists of a structure with the chemical formula BNE-1, where both c and d are 1.

[0403] 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 these, preferably each, contains or comprises a structure according to the chemical formula BNE-1. 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.

[0404] 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 these, preferably each, contains or comprises a structure according to the chemical formula BNE-1. 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 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.

[0405] 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 these, preferably each, contains or comprises a structure according to the chemical formula BNE-1. 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.

[0406] 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 these, preferably each, contains or comprises a structure according to the chemical formula BNE-1. X 3 This is direct coupling or NR BNE-3 And, Y 2 This is a direct bond.

[0407] 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 these, preferably each, contains or comprises a structure according to the chemical formula BNE-1. X 3 , NR BNE-3 And, Y 2 This is a direct bond.

[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 these, preferably each, contains or comprises a structure according to the chemical formula BNE-1. R BNE-1 , R BNE-2 , RBNE-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 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 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-C40 Thioalkoxy, This is 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 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 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 one or more substituents R BNE-5 It is selectively replaced by and C2-C 57 Heteroaryl, This is 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 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 one or more substituents R BNE-a It is selectively replaced by and C2-C 57 Heteroaryl, This is 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, 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 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 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 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 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 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 one or more substituents R BNE-5 It is selectively replaced by and C2-C 57 Heteroaryl, This is one or more substituents R BNE-5 It is selectively replaced by, R BNE-5 Each of these is independently selected from the following groups: Hydrogen, deuterium, N(R) BNE-6 )2, OR BNE-6 , Si(R BNE-6 )3, B(OR BNE-6 )2, B(R BNE-6 )2, OSO2R BNE-6 ,CF3,CN,F,Cl,Br,I, C1-C 40 Alkyl, This is one or more substituents RBNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 It is selectively replaced by, C1-C 40 Alkoxy, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 It is selectively replaced by, C1-C 40 Thioalkoxy, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 It is selectively replaced by, C2-C 40 Alkenil, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 It is selectively replaced by, C2-C 40 Alkinil, This is one or more substituents R BNE-6 It is selectively replaced by, Here, one or more non-adjacent CH2 units are R BNE-6 C=CR BNE-6 , C≡C, Si(R BNE-6 )2, Ge(R BNE-6 )2, Sn(R BNE-6 )2, C=O, C=S, C=Se, C=NR BNE-6 , P(=O)(R BNE-6 ), SO, SO2, NR BNE-6 , O, S or CONR BNE-6 It is selectively replaced by, C6-C 60 Ariel, This is one or more substituents R BNE-6 It is selectively replaced by and C2-C 57 Heteroaryl, This is one or more substituents R BNE-6 It is selectively replaced by, R BNE-6 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 with deuterium, CN, CF3, Ph, or F. C1-C5 alkoxy, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C1-C5 thioalkoxy, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C2-C5 alkenyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C2-C5 alkynyl, Here, one or more hydrogen atoms are selectively and independently substituted with deuterium, CN, CF3, or F. C6-C 18 Ariel, This is selectively substituted with one or more C1-C5 alkyl substituents, C2-C 17 Heteroaryl, This is selectively substituted with one or more C1-C5 alkyl substituents, N(C6-C 18 Ariel) 2, N(C2-C 17 Heteroaryl)2, and N(C2-C 17 (Heteroaryl)(C6-C 18 Ariel), Here, R BNE-III and R BNE-e It selectively binds to form a single bond directly. Here, substituent R BNE-a , R BNE-d , R BNE-d’ , R BNE-e , R BNE-3’ , R BNE-4’ and R BNE-5 Two or more of these elements selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with each other. Here, substituent R BNE-1 , R BNE-2 , R BNE-1’ , R BNE-2’ , R BNE-3 , R BNE-4 , R BNE-5 , R BNE-I , R BNE-II , R BNE-III , R BNE-IV and R BNE-VTwo or more of these elements selectively form monocyclic or polycyclic, aliphatic or aromatic or heteroaromatic, carbocyclic or heterocyclic systems with each other. Here, two or more structures of chemical formula BNE-1 are selectively joined to each other, preferably condensed by s...

Claims

1. An organic electroluminescent element comprising a light-emitting layer B containing four components (i) to (iv) which consist of exactly one sublayer: (i) Each has an energy of E ＨＯＭＯ The highest occupied orbit HOMO (EET-1) is E ＬＵＭＯ The lowest unoccupied orbital LUMO (EET-1) is E(S1), and the lowest excited singlet state energy level is E(S1). Ｅ１ ) and the lowest excited triplet state energy level E(T1 Ｅ１ ) having one or more excitation energy transfer components EET-1, (ii) Each has an energy of E ＨＯＭＯ The highest occupied orbit HOMO (EET-2) is E ＬＵＭＯ The lowest unoccupied orbital LUMO (EET-2) is E(S1), and the lowest excited singlet state energy level is E(S1). Ｅ２ ) and the lowest excited triplet state energy level E(T1 Ｅ２ ) having one or more excitation energy transfer components EET-2, (iii) Each having an energy of E ＨＯＭＯ (S Ｂ ) the highest occupied molecular orbital HOMO(S Ｂ ) having an energy of E ＬＵＭＯ (S Ｂ ) the lowest unoccupied molecular orbital LUMO(S Ｂ ), the lowest singlet excited state energy level E(S1 Ｓ ) and the lowest triplet excited state energy level E(T1 Ｓ ), and emitting light having a full width at half maximum (FWHM) of 0.25 eV or less respectively, one or more small full width at half maximum (FWHM) emitters S Ｂ , and selectively (iv) Each has an energy of E ＨＯＭＯ (H Ｂ The highest occupied orbit HOMO (H Ｂ ), energy E ＬＵＭＯ (H Ｂ ) is the lowest open orbit LUMO(H Ｂ ), the lowest excited singlet state energy level E(S1 Ｈ ) and the lowest excited triplet state energy level E(T1 Ｈ ) having one or more host materials H Ｂ , Here, EET-1 and EET-2 are not structurally identical. Here, EET-1 and EET-2 are thermally activated delayed fluorescence (TADF) materials E Ｂ And, One of the TADF materials E B has a lowest unoccupied orbital LUMO (E B) with an energy E LUMO (E B) less than -2.6 eV, Here, E(T1 ＥＥＴ－１ )>E(S1 Ｓ ) and E(T1 ＥＥＴ－２ )>E(S1 Ｓ ) and Here, |E(S1 ＥＥＴ－１ )-E(T1 ＥＥＴ－２ ) | ≤ 0.3eV, and | E(S1 ＥＥＴ－２ )-E(T1 ＥＥＴ－１ ) | ≤ 0.3 eV.

2. | E (S1 ＥＥＴ－１ )-E(T1 ＥＥＴ－２ ) | ≤ 0.2eV, and | E(S1 ＥＥＴ－２ )-E(T1 ＥＥＴ－１ The organic electroluminescent element according to claim 1, wherein the voltage is ≤ 0.2 eV.

3. EET-1 and EET-2 are, (i) Independently of each other, the 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 elements according to claim 1 or 2, which independently exhibit a photoluminescence quantum yield (PLQY) greater than 30%.

4. EET-1 and EET-2 are, independently of each other, organic electroluminescent elements according to any one of claims 1 to 3, comprising: - One or more first chemical moieties, independently selected from amino groups, indolyl groups, carbazolyl groups and their derivatives, each selectively substituted, where the 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, carbocyclic or heterocyclic systems, and -CN and one or more second chemical moieties independently selected from the group consisting of selectively substituted 1,3,5-triazinyl groups.

5. The small FWHM emitter S Ｂ The organic electroluminescent element according to any one of claims 1 to 4, which satisfies at least one of the following requirements: (i) Boron (B)-containing emitters, which are each small FWHM emitters S Ｂ This means that at least one atom in is boron (B), and / or (ii) comprising a polycyclic aromatic or heteroaromatic core structure in which at least two aromatic rings are condensed together.

6. The small FWHM emitter S Ｂ The organic electroluminescent element according to any one of claims 1 to 5, wherein the emitter is boron-containing.

7. The small FWHM emitter S Ｂ The organic electroluminescent element according to any one of claims 1 to 6, which exhibits delayed fluorescence.

8. The small FWHM emitter S Ｂ The organic electroluminescent element according to any one of claims 1 to 7, wherein it exhibits maximum light emission in the range of 510 nm to 550 nm.

9. The small FWHM emitter S Ｂ The organic electroluminescent element according to any one of claims 1 to 7, wherein it exhibits maximum light emission in the range of 440 nm to 480 nm.

10. The aforementioned host material H Ｂ p-host material H includes or consists of the following: Ｐ The organic electroluminescent element according to any one of claims 1 to 9: -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 comprising or consisting of at least 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 at least one second chemical part consisting of such a structure, 【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 is, in each case independently of one another, a direct bond, C(R ＩＩ ), C═C(R ２ ), C═O, C═NR ＩＩ ), NR ２ ), O, Si(R ＩＩ ), S, S(O) and S(O) ＩＩ ), selected from the group consisting of ＩＩ ), ２ and ２ ; 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.

11. The light-emitting layer B comprises or consists of the following, according to any one of claims 1 to 10: (i) 30 to 99.7% by weight of one or more host compounds H Ｂ , (ii) 0.1 to 40% by weight of 1 or more excitation energy transfer components EET-1, (iii) 0.1 to 40% by weight of 1 or more excitation energy transfer components EET-2, (iv) 0.1 to 10% by weight of small FWHM emitters S Ｂ , and selectively (v) 0 to 69.7% by weight of one or more solvents.

12. The light-emitting layer B is composed of 20 to 40% by weight of TADF material E, based on the total mass of the light-emitting layer B. Ｂ An organic electroluminescent element according to any one of claims 1 to 11, comprising the above.

13. Light generation method including the following steps: (i) the step of providing an organic electroluminescent element according to any one of claims 1 to 12, and (ii) The step of applying an electric current to the organic electroluminescent element.

14. The light generation method according to claim 13, 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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