Green light emitting organic electroluminescent device and method for producing green light

Abstract

The present invention comprises at least one host material H B , at least one thermally activated delayed fluorescent (TADF) material E B and at least one small full width at half maximum (FWHM) emitter S B In particular, the present invention relates to an organic electroluminescent device comprising at least one light-emitting layer B comprising B is the energy S B Move to S B It emits light having a maximum emission in the wavelength range of 500 nm to 560 nm.

Description

[Technical field]

[0001] The present invention comprises at least one host material H B at least one emissive layer B comprising at least one thermally activated delayed fluorescent (TADF) material E B and at least one small full width at half maximum (FWHM) emitter S B An organic electroluminescent device comprising: B Energy is S B Go to S B emits light. B exhibits a narrow (expressed as small full width at half maximum (FWHM)) green emission with an emission maximum between 500 nm and 560 nm. Furthermore, the present invention relates to a method for generating green light by means of an organic electroluminescent device according to the present invention. [Background technology]

[0002] Organic electroluminescent devices containing one or more light-emitting layers based on organic materials, such as organic light-emitting diodes (OLEDs), light-emitting electrochemical cells (LECs) and light-emitting transistors, are gaining more and more importance. In particular, for electronic products such as screens, displays and illumination devices, OLEDs are promising devices. In contrast to most electroluminescent devices essentially based on inorganic materials, organic-based electroluminescent devices are often quite flexible and can be produced in particularly thin layers. Today, the already available OLED-based screens and displays have either good efficiency and long life, or good color purity and long life, but do not combine all three properties, i.e. good efficiency, long life and good color purity. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, there remains an unmet technical need for organic electroluminescent devices that have high quantum yields, long lifetimes and good color purity.

[0004] The color purity or color point of an OLED is typically given by CIEx and CIEy coordinates, while the color gamut for the next display generation is given by the so-called BT-2020 and DCPI3 values. Generally, to achieve these color coordinates, the top light-emitting element needs to have its color coordinates adjusted by modifying the cavity. To achieve high efficiency in the top light-emitting element while targeting these color gamuts, a narrow emission spectrum in the bottom light-emitting element is typically desired.

[0005] Recently, several fluorescent short-range charge transfer (NRCT) emitters have been developed, which exhibit fairly narrow emission spectra with FWHMs below 0.25 eV and are therefore more suitable for achieving the BT-2020 and DCPI3 color gamuts.

[0006] The central element of an organic electroluminescent device for generating light is typically at least one light-emitting layer located between an anode and a cathode. When a voltage (and current) is applied to the organic electroluminescent device, holes and electrons are injected from the anode and the cathode, respectively. Typically, a hole transport layer is typically located between the light-emitting layer and the anode, and an electron transport layer is typically located between the light-emitting layer and the cathode. The different layers are deposited in succession. High-energy excitons are then generated by recombination of holes and electrons in the light-emitting layer. The decay of such excited states (e.g., singlet states such as S1 and / or triplet states such as T1) to the ground state (S0) desirably results in the emission of light.

[0007] Surprisingly, it has been found that an emissive layer of an organic electroluminescent device comprising at least one TADF material, at least one small full width at half maximum (FWHM) emitter and at least one host material provides an organic electroluminescent device having a long lifetime, high quantum yield and exhibiting narrow emission ideally suited to achieve the BT-2020 and DCPI3 color gamuts.

[0008] Here, at least one TADF material transfers energy to at least one small full width at half maximum (FWHM) emitter exhibiting green emission with a maximum emission between 500 nm and 560 nm. [Means for solving the problem]

[0009] Thus, one aspect of the present invention is a method for producing a composition comprising the steps of: (i) at least one host material H B , which is the lowest singlet excited state energy level E(S1 H ) and the lowest triplet excited state energy level E(T1 H ) ; (ii) at least one TADF material E B , which is the lowest singlet excited state energy level E(S1 E ) and the lowest triplet excited state energy level E(T1 E ) and (iii) at least one small FWHM emitter S B , which is the lowest singlet excited state energy level E(S1 S ) and the lowest triplet excited state energy level E(T1 S ) An organic electroluminescent device comprising one or more emitting layers B comprising: Here, (each) E B The energy is (at least one) S B Move to (each) S B emits green light having a maximum emission between 500 nm and 560 nm (within the wavelength range); E(S1 H )>E(S1 E ) (1) E(S1 H )>E(S1 S ) (2) E(S1 E )>E(S1 S ) (3) E(T1 H )>E(T1 S ) (4) E(T1 H )>E(T1 E ) (5) This relates to an organic electroluminescence device, in which the relationship expressed by:

[0010] In a preferred embodiment, at least one small full width at half maximum (FWHM) emitter S B is a boron-containing phosphor. In a preferred embodiment, each small full width at half maximum (FWHM) phosphor S B is a boron-containing phosphor.

[0011] Therefore, the host material H B The lowest singlet excited state S1 H TADF material E B The lowest singlet excited state S1 E higher in energy than the host material H B The lowest singlet excited state S1 H is the FWHM of an arbitrary small emitter S B The lowest singlet excited state S1 S Higher in energy than TADF material E B The lowest singlet excited state S1 E is the FWHM of any small emitter S B The lowest singlet excited state S1 S higher in energy than the host material H B The lowest triplet excited state T1 H is the FWHM of an arbitrary small emitter S B The lowest triplet excited state T1 S higher in energy than the host material HB The lowest triplet excited state T1 H TADF material E B The lowest triplet excited state T1 E is higher in energy than

[0012] In a preferred embodiment of the present invention, the TADF material E B The lowest triplet excited state T1 E is the FWHM of an arbitrary small emitter S B The lowest triplet excited state T1 S Higher in energy than E(T1 E )>E(T1 S ).

[0013] In a preferred embodiment of the invention, the electroluminescent device according to the invention comprises exactly one light-emitting layer B.

[0014] In another embodiment of the invention, the electroluminescent device according to the invention comprises exactly two light-emitting layers B.

[0015] In another embodiment of the invention, the electroluminescent device according to the invention comprises more than two light-emitting layers B.

[0016] It is understood that the different light-emitting layers B optionally present in the same organic electroluminescent device according to the invention do not necessarily all contain the same materials, or even the same materials in the same ratios.

[0017] In an embodiment of the present invention, at least one light-emitting layer B comprises at least one host material H B , exactly one TADF material E B and exactly one small FWHM emitter S B Includes.

[0018] In a preferred embodiment of the present invention, at least one emitting layer B contains exactly one host material H BIn a preferred embodiment of the present invention, at least one emitting layer B comprises exactly one TADF material E B In a preferred embodiment of the present invention, at least one light-emitting layer B comprises exactly one small FWHM emitter S B In a preferred embodiment of the present invention, at least one light-emitting layer B comprises exactly one host material H B and exactly one TADF material E B In a preferred embodiment of the present invention, at least one light-emitting layer B comprises exactly one host material H B and exactly one small FWHM emitter S B In a preferred embodiment of the present invention, at least one emitting layer B comprises exactly one TADF material E B and exactly one small FWHM emitter S B In a preferred embodiment of the present invention, at least one light-emitting layer B comprises exactly one host material H B , exactly one TADF material E B and exactly one small FWHM emitter S B Includes.

[0019] In one embodiment, a small FWHM emitter S B presents a thermally activated delayed fluorescence (TADF) material. In one embodiment, the TADF material E B exhibits small FWHM. B In some cases, the TADF material E may emit light in the visible wavelength range, for example with a maximum emission in the wavelength range of 500 nm to 560 nm. B exhibits a small FWHM (eg, 0.30 eV or less, 0.25 eV or less, 0.20 eV or less, 0.15 eV or less, or 0.13 eV or less).

[0020] Surprisingly, the main contribution to the emission band of the photovoltaic device according to the invention is typically S B can contribute to the emission of E B From S B and preferably at least one host material H B From EB to and / or S B This suggests that at least one TADF material, E B but at least one small FWHM emitter S whose main function may be to emit green light. B These results suggest that the endothelial cells may act as an energy pump for

[0021] The light-emitting device according to the present invention exhibits a longer lifetime and / or higher efficiency than that of a device having a similar device structure, in which at least one light-emitting layer is composed of at least one host material H B At least one TADF material E B or at least one small FWHM emitter S B in combination with either (but not both).

[0022] Of particular interest is the E B and S. B Depending on the combination with, energy from a lower energy state can also be transferred to a higher energy state of another compound. Taking into account the reverse interclimbing crossing (RISC) that occurs in TADF materials, the E of the present invention B and S. B The combination with a small FWHM emitter S B This results in a particularly efficient light emission of

[0023] Further embodiments of the invention provide a luminance distribution of greater than 10%, more preferably greater than 13%, more preferably greater than 15%, even more preferably greater than 18%, or even greater than 20% of luminance distribution of greater than 1000 cd / m 2 and an emission maximum between 500 nm and 560 nm.

[0024] Further embodiments of the invention provide a luminance distribution of greater than 10%, more preferably greater than 13%, more preferably greater than 15%, even more preferably greater than 18%, or even greater than 20% of luminance distribution of greater than 1000 cd / m 2and an emission maximum between 510 nm and 550 nm.

[0025] Further embodiments of the invention provide a luminance distribution of greater than 10%, more preferably greater than 13%, more preferably greater than 15%, even more preferably greater than 18%, or even greater than 20% of luminance distribution of greater than 1000 cd / m 2 and an emission maximum between 520 nm and 540 nm.

[0026] In a preferred embodiment, the electroluminescent device (e.g., OLED) has a constant current density J of more than 100 h, preferably more than 200 h, more preferably more than 400 h, even more preferably more than 750 h, or even more than 1000 h. 0 =15mA / cm 2 The LT95 values ​​at

[0027] A further embodiment of the present invention relates to an electroluminescent device (e.g., OLED) that emits light at a distinct color point.According to the present invention, the electroluminescent device (e.g., OLED) emits light with a narrow emission band (small full width at half maximum (FWHM)).In a preferred embodiment, the electroluminescent device (e.g., OLED) according to the present invention emits light with the FWHM of the main emission peak being less than 0.25 eV, more preferably less than 0.20 eV, even more preferably less than 0.15 eV or even less than 0.13 eV.

[0028] A further embodiment of the present invention relates to an electroluminescent device (e.g., an OLED) that emits light with CIEx and CIEy color coordinates (CIEx=0.170 and CIEy=0.797) close to the predominantly green CIEx (=0.170) and CIEy (=0.797) color coordinates defined by ITU-R Recommendation BT.2020 (Rec.2020) and may therefore be suitable for use in ultra-high definition (UHD) displays, such as UHD-TVs. In this context, the term "close to" refers to the range of CIEx and CIEy coordinates provided at the end of this paragraph. In commercial applications, typically top-emitting (top electrode is typically transparent) devices are used, while the test devices used throughout this application represent bottom-emitting devices (bottom electrode and substrate are transparent). Thus, a further aspect of the present invention relates to an electroluminescent device (e.g. an OLED) whose emission exhibits CIEx colour coordinates of between 0.15 and 0.45, preferably between 0.15 and 0.35, more preferably between 0.15 and 0.30, or even more preferably between 0.15 and 0.25, or even between 0.15 and 0.20, and / or CIEy colour coordinates of between 0.60 and 0.92, preferably between 0.65 and 0.90, more preferably between 0.70 and 0.88, or even more preferably between 0.75 and 0.86, or even between 0.79 and 0.84.

[0029] Further embodiments of the present invention relate to OLEDs that emit light with CIEx and CIEy color coordinates close to the CIEx(=0.265) and CIEy(=0.65) color coordinates of the predominant color green (CIEx=0.265 and CIEy=0.65) as defined by DCIP3. In this context, the term "close to" refers to the range of CIEx and CIEy coordinates given at the end of this paragraph. In commercial applications, typically top-emitting (top electrode is typically transparent) devices are used, while the test devices used throughout this application represent bottom-emitting devices (bottom electrode and substrate are transparent). Thus, a further aspect of the present invention relates to an OLED whose bottom emission exhibits CIEx colour coordinates between 0.2 and 0.45, preferably between 0.2 and 0.35, or more preferably between 0.2 and 0.30, or even more preferably between 0.24 and 0.28, or even between 0.25 and 0.27, and / or CIEy colour coordinates between 0.60 and 0.9, preferably between 0.6 and 0.8, more preferably between 0.60 and 0.70, or even more preferably between 0.62 and 0.68, or even between 0.64 and 0.66.

[0030] One of the interesting purposes of an organic electroluminescent device can be the generation of light. Therefore, the present invention further relates to a method for generating light in a desired wavelength range, comprising the step of providing any organic electroluminescent device according to the present invention.

[0031] Thus, a further aspect of the present invention further relates to a method of generating light in a desired wavelength range, the method comprising: (i) providing an organic electroluminescent device according to the present invention; (ii) applying a current to the organic electroluminescence element; Includes.

[0032] A further aspect of the present invention relates to a method of making an organic electroluminescent device by assembling the elements described above. The present invention also relates to a method of generating green light, in particular by using said organic electroluminescent device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] The examples and claims further illustrate the invention.

[0034] Host material H B According to the present invention, one or more host materials H contained in at least one of the light-emitting layers B B is a p-host H that exhibits high hole mobility. P , n-host H showing high electron mobility N , or a bipolar host material H that exhibits both high hole and high electron mobility. BP It can be said that:

[0035] In one embodiment of the present invention, at least one light-emitting layer B of an organic electroluminescent device according to the present invention comprises one or more p-hosts H P In one embodiment of the present invention, at least one light-emitting layer B of the organic electroluminescent device according to the present invention comprises one p-host H P Contains only.

[0036] In one embodiment of the present invention, at least one light-emitting layer B of an organic electroluminescent device according to the present invention comprises one or more n-hosts H N In another embodiment of the present invention, at least one light-emitting layer B of the organic electroluminescent device according to the present invention comprises only one n-host H N Includes.

[0037] In one embodiment of the present invention, at least one light-emitting layer B of an organic electroluminescent device according to the present invention comprises one or more bipolar hosts H BPIn one embodiment of the present invention, at least one light-emitting layer B of the organic electroluminescent device according to the present invention comprises one bipolar host H BP Contains only.

[0038] In another embodiment of the present invention, at least one light-emitting layer B of the organic electroluminescent device according to the present invention comprises at least two different host materials. In this case, the more than one host materials present in at least one light-emitting layer B can be either all p-hosts or all n-hosts or all bipolar hosts, or a combination thereof.

[0039] If the organic electroluminescent device according to the invention comprises more than one emitting layer B, any of them may contain, independently of the other emitting layers, one host material H, for which the definition given above applies. B or more than one host material H B It is understood that the different light-emitting layers B comprised in an organic electroluminescent device according to the present invention do not necessarily all comprise the same materials, or even the same materials in the same concentrations.

[0040] At least one p-host H P and at least one n-host H N can optionally form exciplexes. P and H N H forming exciplexes and selection criteria including requirements for HOMO and / or LUMO energy levels P and H N In cases where exciplex formation is desired, it is known how to choose a pair with the p-host material H P The highest occupied molecular orbital (HOMO) of the n-host material H Nand the HOMO of the p-host material H P The lowest unoccupied molecular orbital (LUMO) of the n-host material H N The LUMO may be at least 0.20 eV higher in energy than the LUMO of

[0041] In a preferred embodiment of the present invention, at least one host material H B (For example, H P , H N and / or bipolar host H BP ) is an organic host material, which means in the context of the present invention that it does not contain any transition metal. In a preferred embodiment of the present invention, all the host materials H B (H P , H N and / or bipolar host H BP ) are organic host materials, which means in the context of the present invention that they do not contain any transition metals. Preferably, at least one host material H B , preferably all host materials H B (H P , H N and / or bipolar host H BP ) consists primarily of the elements hydrogen (H), carbon (C) and nitrogen (N), but may also contain, for example, oxygen (O), boron (B), silicon (Si), fluorine (F) and bromine (Br).

[0042] According to the invention, the p-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention P is the energy E HOMO (H P ) with the highest occupied molecular orbital HOMO(H P ), preferably: -6.1 eV≦E HOMO (H P )≦−5.6 eV.

[0043] According to the invention, the p-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention P is the energy E LUMO (H P ) with the lowest unoccupied molecular orbital LUMO(H P ), preferably: -2.6 eV≦E LUMO (H P ).

[0044] According to the invention, the p-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention P is the lowest singlet excited state energy level E(S1 p-H ), preferably: E(S1 p-H ) ≧3.0 eV.

[0045] According to the invention, the p-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention P is the lowest triplet excited state energy level E(T1 p-H ), preferably: E(T p-H )≧2.7 eV.

[0046] A host material H contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the present invention B Any of the requirements or preferred features defined above for the p-host H P Therefore, in a preferred embodiment, the following formulas (6) to (9): E(S1 p-H )>E(S1 E ) (6) E(S1 p-H )>E(S1 S ) (7) E(T1 p-H )>E(T1 S ) (8) E(T1 p-H)>E(T1 E ) (9) The relationship represented by

[0047] Therefore, the p-host H P The lowest singlet excited state S1 p-H is preferably a TADF material E B The lowest singlet excited state S1 E higher in energy than the p-host H P The lowest singlet excited state S1 p-H is preferably an arbitrary small FWHM emitter S B Singlet excited state S1 S higher in energy than the p-host H P The lowest triplet excited state T1 p-H is preferably an arbitrary small FWHM emitter S B The lowest triplet excited state T1 S higher in energy than the p-host H P The lowest triplet excited state T1 p-H is preferably a TADF material E B The lowest triplet excited state T1 E is higher in energy than

[0048] In a preferred embodiment of the present invention, a p-host H P may include or consist of: - 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 -X, a first chemical moiety comprising or consisting of a structure according to any of the following: [ka]

[0049] and - 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 -XIX, wherein the second chemical moiety comprises or consists of a structure according to any of the following: [ka]

[0050] During the ceremony, p-host material H P each of the at least one second chemical moiety present in is linked to the first chemical moiety via a single bond, represented by a dotted line in the formula above; During the ceremony, Z 1 each occurrence independently represents a direct bond, C(R II ) 2 , C=C(R II ) 2 , C=O, C=NR II , N.R. II , O, Si(R II ) 2 , S, S(O) and S(O) 2 selected from the group consisting of; R I each occurrence is, independently of each other, a single bond attachment site linking a first chemical moiety to a second chemical moiety, or hydrogen, deuterium, Me, i Pr, t Bu, wherein at least one R I is a single bond attachment site linking a first chemical moiety to a second chemical moiety; Ph, this is Me, i Pr, toptionally substituted with one or more substituents independently selected from the group consisting of Bu and Ph; R II Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu and Ph, this is Me, i Pr, t Optionally substituted with one or more substituents independently selected from the group consisting of Bu and Ph. selected from the group consisting of; where two or more adjacent substituents R II can optionally form an aromatic or heteroaromatic ring system having 3 to 18 carbon atoms.

[0051] In an even more preferred embodiment of the present invention, Z 1 Each occurrence is a direct bond and the adjacent substituent R II do not combine to form additional ring systems.

[0052] In a still further more preferred embodiment of the present invention, one or more p-hosts H optionally contained in the organic electroluminescent device according to the present invention P is selected from the group consisting of the following structures: [ka] [ka] [ka]

[0053] According to the invention, the n-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention N is the energy E HOMO (H N ) with the highest occupied molecular orbital HOMO(HN ), preferably having: E HOMO (H N )≦−5.9 eV.

[0054] According to the invention, the n-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention N is the energy E LUMO (H N ) with the lowest unoccupied molecular orbital LUMO(H N ), preferably: -3.5 eV ≦ E LUMO (H N )≦−2.9 eV.

[0055] According to the invention, the n-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention N is the lowest singlet excited state energy level E(S1 n-H ), preferably: E(S1 n-H ) ≧3.0 eV.

[0056] According to the invention, the n-host H optionally contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the invention N is the lowest triplet excited state energy level E(T1 n-H ), preferably: E(T n-H )≧2.7 eV.

[0057] A host material H contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the present invention B Any of the requirements or preferred properties defined above for the n-host H N Therefore, in a preferred embodiment, the following formulas (10) to (13): E(S1 n-H )>E(S1 E ) (10) E(S1n-H )>E(S1 S ) (11) E(T1 n-H )>E(T1 S ) (12) E(T1 n-H )>E(T1 E ) (13) The relationship represented by

[0058] Therefore, the n-host H N The lowest singlet excited state S1 n-H is preferably a TADF material E B The lowest singlet excited state S1 E higher in energy than the n-host H N The lowest singlet excited state S1 n-H is preferably an arbitrary small FWHM emitter S B The lowest singlet excited state S1 S higher in energy than the n-host H N The lowest triplet excited state T1 n-H is preferably an arbitrary small FWHM emitter S B The lowest triplet excited state T1 S Preferably, any n-host H N The lowest triplet excited state T1 n-H is any TADF material E B The lowest triplet excited state T1 E is higher in energy than

[0059] In a preferred embodiment of the present invention, the n-host H N is the formula H N -I, H N -II and H N -III comprising or consisting of a structure according to any of the following: [ka] In the formula, R III and R IVEach occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 , Ph, this is Me, i Pr, t Optionally substituted with one or more substituents independently selected from the group consisting of Bu and Ph. selected from the group consisting of; The structure is of 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 -XIV.

[0060] [ka] In the formula, X 1 is oxygen (O), sulfur (S) or carbon (R V ) 2 and; R V Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu and Ph, this is Me, i Pr, t Optionally substituted with one or more substituents independently selected from the group consisting of Bu and Ph. selected from the group consisting of; wherein two or more adjacent substituents R V may optionally form an aromatic or heteroaromatic ring system having 3 to 18 carbon atoms; In the formula, formula H N -I and H N In the formula II, at least one substituent R III is CN; The dotted line represents the formula H N -I, H N -II, H N The binding sites for either β-III are shown.

[0061] In an even more preferred embodiment of the present invention, one or more n-hosts H N is selected from the group consisting of the following structures: [ka]

[0062] In one embodiment of the present invention, the n-host H contained in at least one emitting layer B of the organic electroluminescent device according to the present invention N None of the above compounds contain phosphine oxide groups. N However, none of them are bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO).

[0063] According to the invention, a bipolar host H optionally contained in any of at least one light-emitting layer B of an organic electroluminescent device according to the invention BP is the energy E HOMO (H BP ) with the highest occupied molecular orbital HOMO(H BP ), preferably: -6.1 eV≦E HOMO (H BP )≦−5.6 eV.

[0064] According to the invention, a bipolar host H optionally contained in any of at least one light-emitting layer B of an organic electroluminescent device according to the invention BP is the energy E LUMO (H BP ) with the lowest unoccupied molecular orbital LUMO(H BP ), preferably: -3.5 eV ≦ E LUMO (H BP)≦−2.9 eV.

[0065] According to the invention, a bipolar host H optionally contained in at least one light-emitting layer B of an organic electroluminescent device according to the invention BP is the lowest singlet excited state energy level E(S1 bp-H ), preferably: E(S1 bp-H ) ≧3.0 eV.

[0066] According to the invention, a bipolar host H optionally contained in at least one light-emitting layer B of an organic electroluminescent device according to the invention BP is the lowest triplet excited state energy level E(T1 bp-H ), preferably: E(T bp-H )≧2.7 eV.

[0067] A host contained in at least one of the light-emitting layers B of the organic electroluminescent device according to the present invention BP Any of the requirements or preferred properties defined above for the bipolar host H according to the invention are preferably BP It is understood that the formula (14) to (17) below are also effective. Therefore, in a preferred embodiment, E(S1 bp-H )>E(S1 E ) (14) E(S1 bp-H )>E(S1 S ) (15) E(T1 bp-H )>E(T1 S ) (16) E(T1 bp-H )>E(T1 E ) (17) The relationship represented by

[0068] Therefore, the bipolar host H BP The lowest singlet excited state S1 bp-H is preferably a TADF material E BThe lowest singlet excited state S1 E It is higher in energy than the bipolar host H BP The lowest singlet excited state S1 bp-H is preferably an arbitrary small FWHM emitter S B The lowest singlet excited state S1 S It is higher in energy than the bipolar host H BP The lowest triplet excited state T1 bp-H is the FWHM of an arbitrary small emitter S B The lowest triplet excited state T1 S Preferably, any bipolar host H BP The lowest triplet excited state T1 bp-H is any TADF material E B The lowest triplet excited state T1 E is higher in energy than

[0069] TADF material E B According to the present invention, one or more thermally activated delayed fluorescent (TADF) materials E B any of the lowest singlet excited states S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26, S27, S28, S29, S30, S31, S32, S33, S34, S35, S36, S37, S38, S39, S40, S41, S42, S43, S44, S45, S46, S47, S48, S49, S50, S51, S52, S53, S54, S55, S56, S57, S58, S59, S60, S61, S62, S63, S64, S65, S66, S67, S68, S69, S70, S71, S72, S73, S74, S75, S76, S77, S78, S79, S81, S82, S83, S84, S85, S96, S97, S98, S99, S105, S99, S106, S107, S108, S110, S111, S121, S132, S142, S154, S165, S176, S186, S197, S108, S109, S110, S111, S121, S132, S143, S155, S166, S177, S187, S198, S199, S109, S109, S109, S110, S E and the lowest triplet excited state T1 E ΔE, which corresponds to the energy difference between ST Therefore, the TADF material E according to the present invention is preferably characterized by exhibiting a value of B ΔE ST is preferably in the lowest singlet excited state S1 E The lowest triplet excited state T1 E The apical crossing is small enough to allow thermal regrowth (also called up-apical crossing or reverse-apical crossing) at room temperature (RT) to

[0070] The organic electroluminescent device according to the present invention includes at least one light-emitting layer B, and a small FWHM emitter S B but with a ΔE of less than 0.4 eVST It is understood that any small FWHM emitter S in the context of the present invention may also have a value of 0.015 to 0.015 and exhibit thermally activated delayed fluorescence (TADF). B This is only an optional feature. In addition, the TADF material E in the context of the present invention B TADF material E B The energy of at least one small FWHM emitter S B The small FWHM emitter S in the context of the present invention functions primarily as an energy pump to B while the main contribution to the emission band of the optoelectronic device according to the invention is made by at least one small FWHM emitter S B can preferably contribute to the emission of light.

[0071] According to the present invention, the TADF material E contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the energy E HOMO (E B ) with the highest occupied molecular orbital HOMO (E B ), preferably: -6.0 eV≦E HOMO (E B )≦−5.8 eV.

[0072] According to the present invention, the TADF material E contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E B ), preferably: -3.4 eV ≦ E LUMO (E B )≦−3.0 eV.

[0073] According to the present invention, the TADF material E contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the lowest singlet excited state energy level E(S1E ), preferably: 2.5 eV ≦ E(S E )≦2.8 eV.

[0074] According to the present invention, the TADF material E contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the lowest triplet excited state energy level E(T1 E ), and the preferred range is ΔE ST The singlet state energy level E(S1 E ) may be defined by the preferred ranges set forth above.

[0075] In a preferred embodiment of the present invention, the TADF material E B has a maximum emission in the wavelength range of 480 nm to 560 nm, preferably 500 nm to 540 nm.

[0076] In a preferred embodiment of the present invention, the TADF material E B is an organic TADF material, which means in the context of the present invention that it does not contain any transition metal. Preferably, the TADF material E according to the present invention B consists primarily of the elements hydrogen (H), carbon (C) and nitrogen (N), but may also contain, for example, oxygen (O), boron (B), silicon (Si), fluorine (F) and bromine (Br).

[0077] In one embodiment of the present invention, at least one TADF material E B each of which comprises at least one electron donating moiety D (i.e., donor) and at least one electron withdrawing moiety A (i.e., acceptor), where at least one donor D and at least one acceptor A are covalently attached to the same linker; The linker is an aromatic or heteroaromatic group having 3 to 30 carbon atoms, most preferably benzene or biphenyl.

[0078] In a preferred embodiment of the invention, each moiety D comprises or consists of a structure represented by any of the formulae shown below: [ka] [ka] [ka]

[0079] During the ceremony, Z 2 Each occurrence of each represents, independently of each other, a direct bond, CR 1 R 2 , C=CR 1 R 2 , C=O, C=NR 1 , N.R. 1 , O, SiR 1 R 2 , S, S(O) and S(O) 2 selected from the group consisting of; # represents the site of attachment of the donor moiety D to the linker as described above; R a , R 1 and R 2 Each occurrence independently represents hydrogen, deuterium, N(R 3 ) 2 , OR 3 , Si(R 3 ) 3 , B(OR 3 ) 2 , O.S.O. 2 R 3 , C.F. 3 , CN, F, Cl, Br, I, C 1 ~C 40 -alkyl, This may be one or more substituents R 3 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 3 C=CR 3 , C≡C, Si(R3 ) 2 , Ge(R 3 ) 2 , Sn(R 3 ) 2 , C=O, C=S, C=Se, C=NR 3 , P(=O)(R 3 ), SO, SO 2 , N.R. 3 , O, S or CONR 3 Optionally replaced by; C 1 ~C 40 -alkoxy, This may be one or more substituents R 3 optionally replaced by wherein one or more non-adjacent CH 2 The - group is 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, SO 2 , N.R. 3 , O, S or CONR 3 Optionally replaced by; C 1 ~C 40 -thioalkoxy, This may be one or more substituents R 3 optionally replaced by wherein one or more non-adjacent CH 2 The - group is 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, SO 2 , N.R.3 , O, S or CONR 3 Optionally replaced by; C 2 ~C 40 -alkenyl, This may be one or more substituents R 3 optionally replaced by wherein one or more non-adjacent CH 2 The - group is 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, SO 2 , N.R. 3 , O, S or CONR 3 Optionally replaced by; C 2 ~C 40 -alkynyl, This may be one or more substituents R 3 optionally replaced by wherein one or more non-adjacent CH 2 The - group is 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, SO 2 , N.R. 3 , O, S or CONR 3 Optionally replaced by; C 6 ~C 60 -aryl, This may be one or more substituents R 3 optionally replaced by; C3 ~C 57 Heteroaryl, This may be one or more substituents R 3 optionally replaced by selected from the group consisting of; R 3 Each occurrence independently represents hydrogen, deuterium, OPh, or CF 3 ,C.N.,F. C 1 ~C 5 -alkyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -alkoxy, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -thioalkoxy, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkenyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkynyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 6 ~C 18 -aryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; C 3 ~C 17Heteroaryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; N(C 6 ~C 18 -aryl) 2 ; N(C 3 ~C 17 -heteroaryl) 2 , and N(C 3 ~C 17 -heteroaryl)(C 6 ~C 18 -aryl) selected from the group consisting of; In the formula, optionally, the substituent R a , R 1 and R 2 may each independently be a monocyclic, polycyclic, aliphatic, aromatic and / or benzo-fused ring system, with one or more adjacent substituents R a , R 1 and R 2 wherein optionally one or more hydrogen atoms of the ring system so formed may be replaced by R 3 may be replaced by:

[0080] In a preferred embodiment of the invention, the donor moiety, D, is not an unsubstituted carbazole.

[0081] In a preferred embodiment of the invention, each acceptor moiety A comprises or consists of a structure represented by any of the formulae shown below: [ka] [ka] [ka]

[0082] During the ceremony, The dotted line represents a single bond connecting the acceptor moiety A to the linker described above; R 4 Each occurrence independently represents hydrogen, deuterium, N(R 5 ) 2 , OR 5 , Si(R 5 ) 3 , B(OR 5 ) 2 , O.S.O. 2 R 5 , C.F. 3 , CN, F, Cl, Br, I, C 1 ~C 40 -alkyl, This may be one or more substituents R 5 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 5 C=CR 5 , C≡C, Si(R 5 ) 2 , Ge(R 5 ) 2 , Sn(R 5 ) 2 , C=O, C=S, C=Se, C=NR 5 , P(=O)(R 5 ), SO, SO 2 , N.R. 5 , O, S or CONR 5 Optionally replaced by; C 1 ~C 40 -Alkoxy This may be one or more substituents R 5 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 5 C=CR 5 , C≡C, Si(R 5 ) 2 , Ge(R 5 ) 2 , Sn(R 5 ) 2 , C=O, C=S, C=Se, C=NR 5, P(=O)(R 5 ), SO, SO 2 , N.R. 5 , O, S or CONR 5 Optionally replaced by; C 1 ~C 40 -thioalkoxy, This may be one or more substituents R 5 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 5 C=CR 5 , C≡C, Si(R 5 ) 2 , Ge(R 5 ) 2 , Sn(R 5 ) 2 , C=O, C=S, C=Se, C=NR 5 , P(=O)(R 5 ), SO, SO 2 , N.R. 5 , O, S or CONR 5 Optionally replaced by; C 2 ~C 40 -alkenyl, This may be one or more substituents R 5 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 5 C=CR 5 , C≡C, Si(R 5 ) 2 , Ge(R 5 ) 2 , Sn(R 5 ) 2 , C=O, C=S, C=Se, C=NR 5 , P(=O)(R 5 ), SO, SO 2 , N.R. 5 , O, S or CONR 5 Optionally replaced by; C 2 ~C 40 -alkynyl, This may be one or more substituents R 5 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 5 C=CR 5 , C≡C, Si(R 5 ) 2 , Ge(R 5 ) 2 , Sn(R 5 ) 2 , C=O, C=S, C=Se, C=NR 5 , P(=O)(R 5 ), SO, SO 2 , N.R. 5 , O, S or CONR 5 Optionally replaced by; C 6 ~C 60 -aryl, This may be one or more substituents R 5 Optionally replaced by; C 3 ~C 57 Heteroaryl, This may be one or more substituents R 5 Optionally replaced by selected from the group consisting of; R 5 Each occurrence independently represents hydrogen, deuterium, OPh, or CF 3 ,C.N.,F. C 1 ~C 5 -alkyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -alkoxy, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F, C 1 ~C 5 -thioalkoxy, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F, C 2 ~C 5 -alkenyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F, C 2 ~C 5 -alkynyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 6 ~C 18 -aryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; C 3 ~C 17 Heteroaryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; N(C 6 ~C 18 -aryl) 2 ; N(C 3 ~C 17 -heteroaryl) 2 , and N(C 3 ~C 17 -heteroaryl)(C 6 ~C 18 -aryl) selected from the group consisting of; wherein optionally two or more adjacent substituents R 4 may, independently of one another, form monocyclic, polycyclic, aliphatic, aromatic and / or benzo-fused ring systems, where optionally one or more hydrogen atoms of the ring system so formed can be replaced by R 5 may be replaced by:

[0083] In an even more preferred embodiment of the present invention, at least one TADF material E B each of which comprises at least one electron donating moiety D (i.e., a donor) and at least one electron withdrawing moiety A (i.e., an acceptor), where all donors D and all acceptors A are covalently attached to the same linker; wherein the linker is an aromatic or heteroaromatic group having 3 to 30 carbon atoms, most preferably benzene or biphenyl; wherein the donor moiety D described above each comprises or consists of a structure represented by any of the formulas shown above; wherein the acceptor moiety A described above each comprises or consists of a structure represented by any of the formulae shown above; In the formula, R 1 and R 2 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, This may be one or more substituents R 3 optionally replaced by; C 3 ~C 17 Heteroaryl, This may be one or more substituents R 3 optionally replaced by selected from the group consisting of; R 4 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium: C6 ~C 18 -aryl, This may be one or more substituents R 5 optionally replaced by; C 3 ~C 17 Heteroaryl, This may be one or more substituents R 5 optionally replaced by selected from the group consisting of; R 3 and R 5 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Phenyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R a Each occurrence represents, independently, hydrogen, Me, i Pr, t Bu, CN, CF 3 , Ph, this is Me, i Pr, t Bu, CN, CF 3 and Ph, Pyridinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Pyrimidinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Carbazolyl, which is Me, i Pr,t Bu, CN, CF 3 and Ph, Triazinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph; and N(Ph) 2 is selected from the group consisting of:

[0084] In a still further more preferred embodiment of the present invention, at least one TADF material E B each of which comprises at least one electron donating moiety D (i.e., donor) and at least one electron withdrawing moiety A (i.e., acceptor), where all donors D and all acceptors A are covalently attached to the same linker; wherein the linker is an aromatic or heteroaromatic group having 3 to 30 carbon atoms, most preferably benzene or biphenyl; wherein the donor moiety D described above each comprises or consists of a structure represented by any of the formulas shown above; wherein each of the acceptor moieties A described above comprises or consists of a structure represented by any of the formulae shown above; In the formula, R 1 , R 2 , R 3 and R 4 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Phenyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; Ra Each occurrence represents, independently, hydrogen, Me, i Pr, t Bu, CN, CF 3 , Ph, this is Me, i Pr, t Bu, CN, CF 3 and Ph; Triazinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, optionally substituted with one or more substituents independently selected from the group consisting of is selected from the group consisting of:

[0085] In one embodiment of the present invention, at least one TADF material E B Each of the is an organic TADF material that includes: each independently having the formula E B one or more first chemical moieties R comprising or consisting of the structure I 6 , [ka] And - Formula E B -II and E B -III, optionally one second chemical moiety comprising or consisting of a structure according to [ka] wherein each second chemical moiety (if present) is connected to a first chemical moiety R via a single bond. 6 Connected to During the ceremony, # is the first chemical moiety R 6 represents the site of attachment to a second chemical moiety, or is hydrogen; k, in each occurrence, is independently 0, 1, 2, 3 or 4; m, in each occurrence, is independently 0, 1 or 2; n, in each occurrence, is independently 0, 1 or 2; each occurrence of o is independently 0 or 1; p, in each occurrence, is independently 0, 1 or 2; q, in each occurrence, is independently 0, 1 or 2; r, in each occurrence, is independently 0, 1, 2, 3, 4 or 5; Q 1 Each occurrence of is independent of each other, N, CR 6 and C.R. 7 selected from the group consisting of; Q 2 Each occurrence of represents, independently, C-Ar EWG and C.R. Q2 selected from the group consisting of; Q 3 Each occurrence of represents, independently, N, C-Ar EWG and C.R. Q2 selected from the group consisting of; Q 4 Each occurrence of 6 , C-Ar EWG and C.R. Q2 selected from the group consisting of; X 2 Each occurrence of represents, independently, Ar EWG , C.N. and C.F. 3 selected from the group consisting of; Ar EWG each occurrence independently represents a group of the formula Ar EWG -I, Ar EWG -II, Ar EWG -III, Ar EWG -IV, Ar EWG -V, Ar EWG -VI, Ar EWG -VII, Ar EWG -VIII, Ar EWG -IX, Ar EWG -X, Ar EWG -XI, Ar EWG -XII, ArEWG -XIII and Ar EWG -XIV.

[0086] [ka]

[0087] These are linked to the core structure (here, preferably of formula E B -I) and R Z1 Each occurrence of represents, independently of each other, CN and CF 3 selected from the group consisting of; Z 3 Each occurrence of each represents, independently of each other, a direct bond, CR 9 R 10 , C=CR 9 R 10 , C=O, C=NR 9 , N.R. 9 , O, SiR 9 R 10 , S, S(O) and S(O) 2 selected from the group consisting of; R e Each occurrence independently represents hydrogen, deuterium, F, Cl, Br and I, C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, This is deuterium, C 1 ~C 5 -Alkyl group, C 6 ~C 18 -aryl groups, optionally substituted with one or more substituents independently selected from the group consisting of F, Cl, Br and I; selected from the group consisting of; R 7 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, This may be one or more substituents R 11 optionally replaced by; C 3 ~C 17 Heteroaryl, This may be one or more substituents R 11 optionally replaced by selected from the group consisting of; R 8 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced with deuterium; C 6 ~C 18 -aryl, This may be one or more substituents R 11 optionally replaced by; C 3 ~C 17 Heteroaryl, This may be one or more substituents R 11 optionally replaced by selected from the group consisting of; R Q2 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 , Ph and Carbazolyl, which is Me, i Pr, t Bu, CN, CF 3 , Ph and N(Ph) 2 and optionally substituted with one or more substituents independently selected from the group consisting of is selected from the group consisting of R b , R c , R d , R 9 and R 10 Each occurrence independently represents hydrogen, deuterium, N(R 12 ) 2 , OR 12 , Si(R 12 ) 3 , B(OR 12 ) 2 , O.S.O. 2 R 12 , C.F. 3 , CN, F, Br, I; C 1 ~C 40 -alkyl, This may be one or more substituents R 12 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 12 C=CR 12 , C≡C, Si(R 12 ) 2 , Ge(R 12 ) 2 , Sn(R 12 ) 2 , C=O, C=S, C=Se, C=NR 12 , P(=O)(R 12 ), SO, SO 2 , N.R. 12 , O, S or CONR 12 Optionally replaced by; C 1 ~C 40 -alkoxy, This may be one or more substituents R 12 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 12 C=CR 12 , C≡C, Si(R 12 ) 2 , Ge(R 12 ) 2 , Sn(R 12 )2 , C=O, C=S, C=Se, C=NR 12 , P(=O)(R 12 ), SO, SO 2 , N.R. 12 , O, S or CONR 12 Optionally replaced by; C 1 ~C 40 -thioalkoxy, This may be one or more substituents R 12 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 12 C=CR 12 , C≡C, Si(R 12 ) 2 , Ge(R 12 ) 2 , Sn(R 12 ) 2 , C=O, C=S, C=Se, C=NR 12 , P(=O)(R 12 ), SO, SO 2 , N.R. 12 , O, S or CONR 12 Optionally replaced by; C 2 ~C 40 -alkenyl, This may be one or more substituents R 12 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 12 C=CR 12 , C≡C, Si(R 12 ) 2 , Ge(R 12 ) 2 , Sn(R 12 ) 2 , C=O, C=S, C=Se, C=NR 12 , P(=O)(R 12 ), SO, SO 2 , N.R. 12 , O, S or CONR 12 Optionally replaced by; C 2 ~C40 -alkynyl, This may be one or more substituents R 12 optionally replaced by wherein one or more non-adjacent CH 2 The - group is R 12 C=CR 12 , C≡C, Si(R 12 ) 2 , Ge(R 12 ) 2 , Sn(R 12 ) 2 , C=O, C=S, C=Se, C=NR 12 , P(=O)(R 12 ), SO, SO 2 , N.R. 12 , O, S or CONR 12 Optionally replaced by; C 6 ~C 60 -aryl, This may be one or more substituents R 12 optionally replaced by; C 3 ~C 57 Heteroaryl, This may be one or more substituents R 12 optionally replaced by selected from the group consisting of; R 11 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 , Phenyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R 12 Each occurrence independently represents hydrogen, deuterium, OPh, or CF 3 ,C.N.,F. C 1 ~C 5 -alkyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -alkoxy, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -thioalkoxy, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkenyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkynyl, In the formula, one or more hydrogen atoms may optionally be independently selected from deuterium, CN, CF 3 or replaced by F; C 6 ~C 18 -aryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; C 3 ~C 17 Heteroaryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; N(C 6 ~C 18 -aryl) 2 ; N(C 3 ~C 17 -heteroaryl) 2 , N(C3 ~C 17 -heteroaryl)(C 6 -C 18 -aryl), and Aliphatic cyclic amino groups containing 5 to 8 carbon atoms (preferably pyrrolidinyl and piperidinyl) selected from the group consisting of; wherein optionally any adjacent substituent R b , R c , R d , R 9 and R 10 form, independently of one another, a monocyclic or polycyclic, aliphatic, aromatic and / or benzo-fused ring system; whereby optionally one or more hydrogen atoms of the ring system thus formed can be replaced by R 12 may be replaced by; In the formula, formula E B In -II, two adjacent groups Q 1 At least one, but not more than three, groups Q, with the restriction that Q and Q cannot both be N. 1 is nitrogen (N); Formula E B In -II, two adjacent groups Q 1 Both are CR 6 At least one, but not more than three, groups Q 1 CR 6 and; In the formula, formula E B In III, at least one group Q 3 is nitrogen (N); wherein preferably: 1≦(m+p)≦4, 1≦(n+q)≦4, 1≦(m+n+o)≦5.

[0088] In a preferred embodiment of the present invention, R b , R c and R d wherein at least one substituent of the group consisting of 3 is a direct bond, and therefore, preferably, the TADF material E BThe donor moiety in cannot be an unsubstituted carbazolyl group.

[0089] In a preferred embodiment of the present invention, R 7 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Ph, which is hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and phenyl, selected from the group consisting of; R 8 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Ph, which is hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and phenyl, selected from the group consisting of; R Q2 Each occurrence of represents, independently, hydrogen, deuterium, Ph, Carbazolyl, which is Me, i Pr, t Bu, CN, CF 3 , Ph and N(Ph) 2 and optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R b , R c and R d Each occurrence represents, independently of the others, hydrogen, Me, i Pr, t Bu, CN, CF 3 , Ph, this is Me, i Pr,t Bu, CN, CF 3 and Ph, Pyridinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Pyrimidinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Carbazolyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Triazinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, And N(Ph) 2 selected from the group consisting of; R e Each occurrence of represents, independently, hydrogen, deuterium, C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, This can be one or more C 1 ~C 5 -alkyl group and / or one or more C 6 ~C 18 - optionally substituted with an aryl group selected from the group consisting of; wherein optionally any adjacent substituent R b , R c , R d , R 9 and R 10 are, independently of one another, monocyclic or polycyclic, aliphatic, aromatic and / or benzo-fused ring systems containing 3 to 30 carbon atoms Forming; except where the definition set forth above applies.

[0090] In an even more preferred embodiment of the present invention, Z 3 is a direct bond for each occurrence; R 7 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, This may be one or more substituents R 11 optionally replaced by; C 3 ~C 17 Heteroaryl, This may be one or more substituents R 11 optionally replaced by selected from the group consisting of; R 8 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, This may be one or more substituents R 11 optionally replaced by; C 3 ~C17 Heteroaryl, This may be one or more substituents R 11 optionally replaced by; Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Ph, which is hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and phenyl; selected from the group consisting of; R Q2 Each occurrence of represents, independently, hydrogen, deuterium, Ph and Carbazolyl, which is Ph and N(Ph) 2 and optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R b , R c and R d Each occurrence represents, independently of the others, hydrogen, Me, i Pr, t Bu, CN, CF 3 and Ph, this is Me, i Pr, t Bu, CN, CF 3 and Ph; Carbazolyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph; Triazinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R e Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu and C 6 ~C 18 -aryl, This is deuterium, Me, i Pr, t Optionally substituted with one or more substituents selected from the group consisting of Bu selected from the group consisting of; wherein optionally any adjacent substituent R b , R c , R d , R 9 and R 10 form, independently of each other, a monocyclic or polycyclic, aliphatic, aromatic and / or benzo-fused ring system containing 3 to 18 carbon atoms; except where the definition set forth above applies.

[0091] In a still further preferred embodiment of the present invention, Z 3 is a direct bond for each occurrence; R 7 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Ph, which is hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and phenyl, selected from the group consisting of; R 8 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Ph, which is hydrogen, deuterium, Me, i Pr, tBu, CN, CF 3 and phenyl, selected from the group consisting of; R Q2 Each occurrence represents, independently, hydrogen, deuterium, and Carbazolyl, which is Ph and N(Ph) 2 and optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R b Each occurrence is hydrogen; R c and R d Each occurrence represents, independently, hydrogen, Me, i Pr, t Bu, CN, CF 3 , Ph, this is Me, i Pr, t Bu, CN, CF 3 and Ph; Pyridinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Pyrimidinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Carbazolyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, Triazinyl, which is Me, i Pr, t Bu, CN, CF 3and Ph, And N(Ph) 2 selected from the group consisting of; R e Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu and Ph, which is deuterium, Me, i Pr, t Optionally substituted with one or more substituents selected from the group consisting of Bu selected from the group consisting of; except where the definition set forth above applies.

[0092] In a particularly preferred embodiment of the present invention, Z 3 is a direct bond for each occurrence; Ar EWG each occurrence independently represents a group of the formula Ar EWG -I, Ar EWG -VII, Ar EWG -VIII, Ar EWG -IX, Ar EWG -X, Ar EWG -XI, Ar EWG -XII and Ar EWG -XIII; R 7 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and Ph, which is hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and phenyl, selected from the group consisting of; R 8 Each occurrence independently represents hydrogen, deuterium, Me, i Pr,t Bu, CN, CF 3 and Ph, which is hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 and phenyl, selected from the group consisting of; R Q2 Each occurrence represents, independently, hydrogen, deuterium, and Carbazolyl, which is Ph and N(Ph) 2 and optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R b Each occurrence is hydrogen, R c and R d Each occurrence represents, independently of the others, hydrogen, Me, i Pr, t Bu, CN, CF 3 and Ph, this is Me, i Pr, t Bu, CN, CF 3 and Ph; Carbazolyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R e Each occurrence is hydrogen; except where the definition set forth above applies.

[0093] In one embodiment of the present invention, one or more TADF materials E B Each of the formula E B -I-1, E B -I-2, EB -I-3, E B -I-4, E B -I-5, E B -I-6, E B -I-7 and E B -having a structure represented by any of I-8: [ka] [ka] [ka]

[0094] During the ceremony, Y 1 Each occurrence of is nitrogen (N) or CH, and at least one Y 1 is N, R 13 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 , Ar EWG , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, This is deuterium, C 1 ~C 5 -Alkyl groups and C 6 ~C 18 -Optionally substituted with one or more substituents independently selected from aryl groups selected from the group consisting of; R 14 and R 15 Each occurrence of is independently C-Ar EWG and C.R. Q2 selected from the group consisting of; R 16 Each occurrence of 6 , C-ArEWG and C.R. Q2 selected from the group consisting of; where there are not more than two groups R 13 CN, CF 3 or Ar EWG and; except where the definition set forth above applies.

[0095] In a preferred embodiment of the present invention, one or more TADF materials E B Each of the formula E B -I-1a, E B -I-2a, E B -I-3a, E B -I-4a, E B -I-5a, E B -I-6a, E B -I-7 (see above) and E B -I-8 (see above).

[0096] [ka] [ka] [ka]

[0097] In the formula, R 13 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 , Ar EWG and Ph, which is deuterium, Me, i Pr, t Optionally substituted with one or more substituents independently selected from the group consisting of Bu and Ph. selected from the group consisting of; where there are not more than two groups R 13 CN, CF 3 or ArEWG and; except where the definition set forth above applies.

[0098] Optionally, any adjacent substituent R b , R c , R d , R 9 and R 10 may, independently of one another, form a monocyclic or polycyclic, aliphatic, aromatic and / or benzo-fused ring system; optionally one or more hydrogen atoms of the ring system so formed may be replaced by R 12 may be replaced by:

[0099] In a preferred embodiment, there are not more than two groups R 13 CN, CF 3 or Ar EWG It is.

[0100] In a preferred embodiment, 1≦(m+p) and / or 1≦(n+q).

[0101] In an even more preferred embodiment of the present invention, one or more TADF materials E B Each of the formula E B -I-1a-1, E B -I-2a-1, E B -I-3a-1, E B -I-4a-1, E B -I-5a-1, E B -I-6a-1, E B -I-7 (see above) and E B -I-8 (see above), [ka] [ka] [ka]

[0102] In the formula, R 13 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 , Ar EWG and Ph, which is deuterium, Me, i Pr, t Optionally substituted with one or more substituents independently selected from the group consisting of Bu and Ph. selected from the group consisting of; where not more than two groups R are attached to the same benzene ring. 13 CN, CF 3 or Ar EWG and; except where the definition set forth above applies.

[0103] In a still further preferred embodiment of the present invention, one or more TADF materials E B Each of the formula E B -I-1a-1, E B -I-2a-1, E B -I-3a-1, E B -I-4a-1, E B -I-5a-1, E B -I-6a-1, E B -I-7 (see above) and E B -I-8, In the formula, Z 3 is a direct bond, each occurrence of except where the definition set forth above applies.

[0104] In a preferred embodiment of the present invention, X 2 Each occurrence of represents, independently of each other, CN, [ka] is selected from the group consisting of These are connected via the positions marked by dotted lines.

[0105] In a preferred embodiment of the present invention, Y 1 Each occurrence is nitrogen (N).

[0106] In a particularly preferred embodiment of the present invention, one or more TADF materials E B Each of the formula E B -I-3a-1a, E B -I-3a-1b, E B -I-4a-1a and E B -having a structure represented by any of I-4a-1b: [ka] [ka] In the formula, preferably R EWG Each occurrence independently represents hydrogen, CN, and [ka] In the formula, formula E B -I-3a-1a and E B In I-4a-1a, preferably, two R EWG Exactly one of them is hydrogen.

[0107] TADF materials E for use in organic electroluminescent devices according to the present invention B Examples are listed below, where the invention is, of course, not limited to devices that contain one of these molecules.

[0108] Formula E B -TADF material E by I-3a-1a B Particularly preferred examples are listed below: [ka]

[0109] Formula E B-TADF material E by I-3a-1b B Particularly preferred examples are listed below: [ka]

[0110] Formula E B -TADF material E by I-4a-1a B Particularly preferred examples are listed below: [ka] [ka] [ka] [ka]

[0111] Formula E B -TADF material E by I-4a-1b B Particularly preferred examples are listed below: [ka]

[0112] TADF Materials for Use According to the Invention B Further examples are listed below: [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0113] TADF material E B The synthesis of can be achieved via standard reactions and reaction conditions known to those skilled in the art. Typically, in the first step, a coupling reaction, preferably a palladium-catalyzed coupling reaction, may be carried out to give the compound of formula E B -TADF material E by I-3a-1 B The synthesis of the compound is exemplarily shown below: [ka]

[0114] E1 is any boric acid (R B =H) or an equivalent amount of borate ester (R B = alkyl or aryl), in particular, two R B forms a ring to give, for example, fluoro-(trifluoromethyl)phenyl, difluoro-(trifluoromethyl)phenyl, fluoro-(cyano)phenyl or difluoro-(cyano)phenyl boric acid pinacol ester. E2 is used as the second reactant, where Hal refers to halogen, which may be I, Br or Cl, but is preferably Br. The reaction conditions for such palladium-catalyzed coupling reactions are known to those skilled in the art, for example from WO2017 / 005699, and it is known that the reacting groups of E1 and E2 can be exchanged to optimize the reaction yield, as shown below.

[0115] [ka]

[0116] In a second step, a compound of formula E B Molecules according to -I-3a-1 can be obtained via reaction E3 of the nitrogen heterocycle with an aryl halide, preferably an aryl fluoride or an aryl dihalide, preferably an aryl dihalide, in a nucleophilic aromatic substitution. Typical conditions include the use of a base such as potassium tribasic phosphate or sodium hydride in an aprotic polar solvent such as dimethylsulfoxide (DMSO) or N,N-dimethylformamide (DMF).

[0117] [ka]

[0118] In particular, the donor molecule E4 is a 3,6-substituted carbazole (e.g., 3,6-dimethylcarbazole, 3,6-diphenylcarbazole, 3,6-di-tert-butylcarbazole), a 2,7-substituted carbazole (e.g., 2,7-dimethylcarbazole, 2,7-diphenylcarbazole, 2,7-di-tert-butylcarbazole), a 1,8-substituted carbazole (e.g., 1,8-dimethylcarbazole, 1,8-diphenylcarbazole, 1,8-di-tert-butylcarbazole), a monosubstituted carbazole (e.g., 1-methylcarbazole, 1-phenylcarbazole, 1-tert-butylcarbazole), a disubstituted carbazole (e.g., 2-methylcarbazole, 2-phenylcarbazole, 2-tert-butylcarbazole), or a trisubstituted carbazole (e.g., 3-methylcarbazole, 3-phenylcarbazole, 3-tert-butylcarbazole). Alternatively, halogen substituted carbazoles, specifically 3-bromocarbazole, can be used as E4. In a subsequent reaction, a borate ester or boric acid functional group may illustratively be introduced at the position of one or more halogen substituents introduced via E4, for example via reaction with bis(pinacolato)diboron (CAS No. 73183-34-3), to produce the corresponding carbazol-3-yl borate ester or carbazol-3-yl boric acid. b , R c or R d is a corresponding halogenated reactant, e.g., R c -Hal, preferably R c -Cl and R c It may be introduced at the location of a borate ester group or a boronic acid group via a coupling reaction with -Br. Alternatively, the substituent R b [R b -B(OH) 2 ], R c [R c -B(OH) 2 ] or R d [R d -B(OH) 2 or the corresponding boronic acid ester, b , R c or R d may be introduced at the position of one or more halogen substituents.

[0119] Further TADF emitting materials B can be obtained in the same manner. B may also be obtained by any alternative synthetic route suitable for this purpose.

[0120] An alternative synthetic route may involve the introduction of a nitrogen heterocycle to an aryl halide or pseudohalide, preferably an aryl bromide, iodide, triflate or tosylate, via copper or palladium catalyzed coupling.

[0121] Small FWHM illuminant SB A small full width at half maximum (FWHM) emitter S in the context of the present invention B is any phosphor having an emission spectrum exhibiting a FWHM of 0.25 eV or less (≦0.25 eV) measured at room temperature (i.e. (approximately) 20° C.) at 1-5 wt %, particularly 1 wt %, of the phosphor in poly(methyl methacrylate) PMMA.

[0122] In a preferred embodiment of the present invention, a small FWHM emitter S in the context of the present invention is B is PMMA (1-5 wt%, especially 1 wt% of phosphor S B In another embodiment of the invention, at least one small FWHM emitter S is any emitter having an emission spectrum exhibiting an FWHM of ≦0.24 eV, more preferably ≦0.23 eV, even more preferably ≦0.22 eV, ≦0.21 eV, or ≦0.20 eV, as measured at room temperature (i.e. (approximately) 20° C.) using a 1000 nm wavelength laser (UVLA) or a 1000 nm wavelength laser (UVLA). B exhibit a FWHM of ≦0.19 eV, ≦0.18 eV, ≦0.17 eV, ≦0.16 eV, ≦0.15 eV, ≦0.14 eV, ≦0.13 eV, ≦0.12 eV, or ≦0.11 eV.

[0123] In addition, a small FWHM emitter S in the context of the present invention B is PMMA (1-5 wt%, especially 1 wt% of phosphor S B The maximum emission is in the wavelength range of 500 nm to 560 nm when measured at room temperature using a 500 nm FT-IR spectrophotometer.

[0124] In a preferred embodiment of the present invention, one or more at least one small FWHM emitter S B is the phosphor S in PMMA (1-5 wt%, especially 1 wt%) B The maximum emission is in the wavelength range of 520 nm to 540 nm when measured at room temperature using a .

[0125] TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device according to the present inventionB However, it is understood that the TADF material E may have an emission spectrum exhibiting a FWHM of 0.25 eV or less (≦0.25 eV). B can also exhibit a maximum emission in the wavelength range of 500 nm to 560 nm. B EB typically contains at least one small FWHM emitter S B While it mainly serves as an energy pump transfer energy to the photoelectron device according to the present invention, the main contribution to the emission band of the photoelectron device according to the present invention is from at least one small FWHM emitter S B Any small FWHM emitter S in the context of the present invention can be preferably contributed to the emission of B is different.

[0126] In a preferred embodiment of the present invention, an arbitrary small FWHM emitter S B is an organic emitter, which means in the context of the present invention that it does not contain any transition metal. Preferably, any small FWHM emitter S according to the present invention B consists primarily of the elements hydrogen (H), carbon (C), nitrogen (N) and boron (B), but may also contain, for example, oxygen (O), silicon (Si), fluorine (F) and bromine (Br).

[0127] In a preferred embodiment of the present invention, a small FWHM emitter S in the context of the present invention is B is a short-range charge transfer (NRCT) emitter.

[0128] Typical NRCT emitters have been described in the literature by Hatakeyama et al. (Advanced Materials, 2016, 28(14):2777-2781, DOI: 10.1002 / adma.201505491) and exhibit delayed components in the time-resolved photoluminescence spectra, indicating close-range HOMO-LUMO separation.

[0129] A typical NRCT emitter exhibits only one emission band in the emission spectrum, whereas a typical fluorescent emitter exhibits several distinct emission bands due to vibrational progression.

[0130] According to the present invention, any small FWHM emitter S contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the energy E HOMO (S B ) with the highest occupied molecular orbital HOMO(S B ), preferably: -5.6 eV≦E HOMO (S B )≦−5.4 eV.

[0131] According to the present invention, any small FWHM emitter S contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the energy E LUMO (S B ) with the lowest unoccupied molecular orbital LUMO(S B ), preferably: -3.1 eV≦E LUMO (S B )≦−2.9 eV.

[0132] According to the present invention, any small FWHM emitter S contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the lowest singlet excited state energy level E(S1 S ), preferably: 2.4 eV ≦ E(S S )≦2.6 eV.

[0133] According to the present invention, any small FWHM emitter S contained in at least one of the emitting layers B of the organic electroluminescent device according to the present invention B is the lowest triplet excited state energy level E(T1 S ), the preferred range being the singlet state energy level E(S1 S) according to the preferred ranges set forth above, and the small FWHM emitter S B ΔE ST can be defined by the preferred feature that

[0134] In a preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the above is a boron (B)-containing phosphor.

[0135] Known examples of boron (B)-containing small FWHM emitters include structures having a boron-dipyrromethene core, where typically the boron element is additionally substituted with either two fluorine substituents or two alkoxy substituents, where one or more hydrogen atoms may be replaced by fluorine (F) or two aryloxy substituents. Specific examples of such emitters are shown below: [ka]

[0136] In one embodiment, at least one small FWHM emitter S B Each of comprises or consists of a polycyclic aromatic compound.

[0137] In one embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -I, comprising or consisting of the structure: [ka] where B is boron; Ar 1 , Ar 2 and Ar 3 are each independently selected from the group consisting of an aromatic ring and a heteroaromatic ring, and Ar 1 , Ar 2 , Ar 3can optionally be linked to each other to form one or more additional rings.

[0138] General formula S B -I Ar 1 , Ar 2 , Ar 3 The aromatic ring as the aromatic ring is, for example, an aryl ring having 6 to 30 carbon atoms. The aryl ring is preferably an aryl ring having 6 to 16 carbon atoms, more preferably an aryl ring having 6 to 12 carbon atoms, and particularly preferably an aryl ring having 6 to 10 carbon atoms.

[0139] General formula S B -I Ar 1 , Ar 2 , Ar 3 Specific examples of the aromatic ring as the aromatic ring include a monocyclic ring such as a benzene ring; a bicyclic ring such as a biphenyl ring; a fused bicyclic ring such as a naphthalene ring; a tricyclic ring such as a terphenyl ring (m-terphenyl, o-terphenyl or p-terphenyl); a fused tricyclic ring such as an acenaphthylene ring, a fluorene ring, a phenalene ring and a phenanthrene ring; a fused tetracyclic ring such as a triphenylene ring, a pyrene ring and a naphthacene ring; and a fused pentacyclic ring such as a pentylene ring and a pentacene ring.

[0140] General formula S B -I Ar 1 , Ar 2 , Ar 3 The aromatic ring as represented by the general formula S is, for example, a heteroaryl ring having 2 to 30 carbon atoms, and the heteroaryl ring is preferably a heteroaryl ring having 2 to 25 carbon atoms, more preferably a heteroaryl ring having 2 to 20 carbon atoms, even more preferably a heteroaryl ring having 2 to 15 carbon atoms, and particularly preferably a heteroaryl ring having 2 to 10 carbon atoms. B -I Ar 1 , Ar 2 , Ar 3The aromatic heterocycle as represented by the formula (I) may be a heterocycle containing, in addition to carbon as an atom constituting the ring, for example, 1 to 5 heteroatoms selected from oxygen, sulfur and nitrogen.

[0141] General formula S B -I Ar 1 , Ar 2 , Ar 3 Specific examples of the aromatic heterocycle as the aromatic heterocycle include a pyrrole ring, an oxazole ring, an isoxazole ring, a thiazole ring, an isothiazole ring, an imidazole ring, an oxadiazole ring, a thiadiazole ring, a triazole ring, a tetrazole ring, a pyrazole ring, a pyridine ring, a pyrimidine ring, a pyridazine ring, a pyrazine ring, a triazine ring, an indole ring, an isoindole ring, a 1H-indazole ring, a benzimidazole ring, a benzoxazole ring, a benzothiazole ring, a 1H-benzotriazole ring, Examples of the ring include a quinoline ring, an isoquinoline ring, a cinnoline ring, a quinazoline ring, a quinoxaline ring, a phthalazine ring, a naphthyridine ring, a purine ring, a pteridine ring, a carbazole ring, an acridine ring, a phenoxathiin ring, a phenoxazine ring, a phenothiazine ring, a phenazine ring, an indolizine ring, a furan ring, a benzofuran ring, an isobenzofuran ring, a dibenzofuran ring, a thiophene ring, a benzothiophene ring, a dibenzothiophene ring, a furazan ring, an oxadiazole ring, and a thiathrene ring.

[0142] General formula S B -I Ar 1 , Ar 2 , Ar 3 One or more hydrogen atoms in the aromatic or heteroaromatic rings mentioned above as f may be substituted by In the formula, R f Each occurrence independently represents hydrogen, deuterium, N(R 17 ) 2 , OR 17 , S.R. 17 , Si(R 17 ) 3 , B(OR 17 ) 2 , O.S.O. 2 R 17 , C.F.3 , CN, halogen, C 1 ~C 40 -alkyl, This may be one or more substituents R 17 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 17 C=CR 17 , C≡C, Si(R 17 ) 2 , Ge(R 17 ) 2 , Sn(R 17 ) 2 , C=O, C=S, C=Se, C=NR 17 , P(=O)(R 17 ), SO, SO 2 , N.R. 17 , O, S or CONR 17 Optionally replaced by; C 1 ~C 40 -alkoxy, This may be one or more substituents R 17 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 17 C=CR 17 , C≡C, Si(R 17 ) 2 , Ge(R 17 ) 2 , Sn(R 17 ) 2 , C=O, C=S, C=Se, C=NR 17 , P(=O)(R 17 ), SO, SO 2 , N.R. 17 , O, S or CONR 17 Optionally replaced by; C 1 ~C 40 -thioalkoxy, This may be one or more substituents R 17 optionally replaced by; wherein one or more non-adjacent CH 2The - group is R 17 C=CR 17 , C≡C, Si(R 17 ) 2 , Ge(R 17 ) 2 , Sn(R 17 ) 2 , C=O, C=S, C=Se, C=NR 17 , P(=O)(R 17 ), SO, SO 2 , N.R. 17 , O, S or CONR 17 Optionally replaced by; C 2 ~C 40 -alkenyl, This may be one or more substituents R 17 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 17 C=CR 17 , C≡C, Si(R 17 ) 2 , Ge(R 17 ) 2 , Sn(R 17 ) 2 , C=O, C=S, C=Se, C=NR 17 , P(=O)(R 17 ), SO, SO 2 , N.R. 17 , O, S or CONR 17 Optionally replaced by; C 2 ~C 40 -alkynyl, This may be one or more substituents R 17 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 17 C=CR 17 , C≡C, Si(R 17 ) 2 , Ge(R 17 ) 2 , Sn(R 17 ) 2 , C=O, C=S, C=Se, C=NR 17 , P(=O)(R17 ), SO, SO 2 , N.R. 17 , O, S or CONR 17 Optionally replaced by; C 6 ~C 60 -aryl, This may be one or more substituents R 17 optionally replaced by; C 3 ~C 57 Heteroaryl, This may be one or more substituents R 17 optionally replaced by selected from the group consisting of; R 17 Each occurrence independently represents hydrogen, deuterium, OPh, SPh, or CF 3 , CN, F, Si(C 1 ~C 5 -alkyl) 3 , Si(Ph) 3 , C 1 ~C 5 -alkyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -alkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -thioalkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkenyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkynyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 6 ~C 18 -aryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; C 3 ~C 17 Heteroaryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; N(C 6 ~C 18 -aryl) 2 , N(C 3 ~C 17 -heteroaryl) 2 ; and N(C 3 ~C 17 -heteroaryl)(C 6 -C 18 -aryl) selected from the group consisting of; During the ceremony, Substituent R f and R 17 may each independently be monocyclic or polycyclic, aliphatic, aromatic, heteroaromatic and / or benzo-fused ring systems, each independently being substituted by one or more substituents R f , R 17 and / or an aromatic or heteroaromatic ring Ar 1 , Ar 2 and Ar 3 where the ring thus formed may optionally be formed with one or more substituents R f may be optionally substituted with

[0143] In one embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -II, S B -III and S B -IV Containing or consisting of the structure: [ka] During the ceremony, Ar 1 , Ar 2 , Ar 3 , R f and R 17 The above definitions apply to: Y 2 , Y 3 and Y 4 are, each occurrence independently of each other, NR 18 , O, C(R 18 ) 2 , S or Si(R 18 ) 2 is selected from the group consisting of: R 18 are, each occurrence independently of each other, C 1 ~C 5 -alkyl, which is one or more substituents R 19 optionally replaced by; C 6 ~C 60 -aryl, which is one or more substituents R 19 optionally replaced by; C 3 ~C 57 heteroaryl, which is one or more substituents R 19 optionally replaced by; R 19 Each occurrence independently represents hydrogen, deuterium, N(R 20 ) 2 , OR 20 , S.R. 20 , Si(R 20 ) 3 , B(OR20 ) 2 , O.S.O. 2 R 20 , C.F. 3 , CN, halogen, C 1 ~C 40 -alkyl, This may be one or more substituents R 20 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 20 C=CR 20 , C≡C, Si(R 20 ) 2 , Ge(R 20 ) 2 , Sn(R 20 ) 2 , C=O, C=S, C=Se, C=NR 20 , P(=O)(R 20 ), SO, SO 2 , N.R. 20 , O, S or CONR 20 Optionally replaced by; C 1 ~C 40 -alkoxy, This may be one or more substituents R 20 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 20 C=CR 20 , C≡C, Si(R 20 ) 2 , Ge(R 20 ) 2 , Sn(R 20 ) 2 , C=O, C=S, C=Se, C=NR 20 , P(=O)(R 20 ), SO, SO 2 , N.R. 20 , O, S or CONR 20 Optionally replaced by; C 1 ~C 40 -thioalkoxy, This may be one or more substituents R 20optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 20 C=CR 20 , C≡C, Si(R 20 ) 2 , Ge(R 20 ) 2 , Sn(R 20 ) 2 , C=O, C=S, C=Se, C=NR 20 , P(=O)(R 20 ), SO, SO 2 , N.R. 20 , O, S or CONR 20 Optionally replaced by; C 2 ~C 40 -alkenyl, This may be one or more substituents R 20 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 20 C=CR 20 , C≡C, Si(R 20 ) 2 , Ge(R 20 ) 2 , Sn(R 20 ) 2 , C=O, C=S, C=Se, C=NR 20 , P(=O)(R 20 ), SO, SO 2 , N.R. 20 , O, S or CONR 20 Optionally replaced by; C 2 ~C 40 -alkynyl, This may be one or more substituents R 20 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 20 C=CR 20 , C≡C, Si(R 20 ) 2 , Ge(R 20 ) 2 , Sn(R20 ) 2 , C=O, C=S, C=Se, C=NR 20 , P(=O)(R 20 ), SO, SO 2 , N.R. 20 , O, S or CONR 20 Optionally replaced by; C 6 ~C 60 -aryl, This may be one or more substituents R 20 optionally replaced by; C 3 ~C 57 Heteroaryl, This may be one or more substituents R 20 optionally replaced by selected from the group consisting of; R 20 Each occurrence independently represents hydrogen, deuterium, OPh, SPh, or CF 3 , CN, F, Si(C 1 ~C 5 -alkyl) 3 , Si(Ph) 3 , C 1 ~C 5 -alkyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -alkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -thioalkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkenyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkynyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 6 ~C 18 -aryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; C 3 ~C 17 Heteroaryl, This can be one or more C 1 -C 5 - optionally substituted with alkyl substituents; N(C 6 ~C 18 -aryl) 2 , N(C 3 ~C 17 -heteroaryl) 2 ; and N(C 3 ~C 17 -heteroaryl)(C 6 ~C 18 -aryl) selected from the group consisting of; During the ceremony, Substituent R f , R 17 , R 18 and R 19 may each independently be monocyclic or polycyclic, aliphatic, aromatic, heteroaromatic and / or benzo-fused ring systems, each independently being substituted by one or more substituents R f , R 17 , R 18 , R 19 and / or aromatic or heteroaromatic ring Ar 1 , Ar 2 and Ar 3where the ring thus formed may optionally be formed with one or more substituents R f may be optionally substituted with

[0144] In one embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -comprising or consisting of the structure III-3a: [ka] In the formula, R VI , R VII , R VIII , R IX , R X , R XI , R XII , R XIII , R XIV , R XV , R XVI , R XVII , R XVIII , R XIX , R XX , R XXI , R XXII and R XXIII are, independently of each other, hydrogen, deuterium, and N(R 21 ) 2 , OR 21 , S.R. 21 , Si(R 21 ) 3 , B(OR 21 ) 2 , O.S.O. 2 R 21 , C.F. 3 , CN, halogen, C 1 ~C 40 -alkyl, This may be one or more substituents R 21 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 21 C=CR 21 , C≡C, Si(R 21 ) 2 , Ge(R 21 ) 2, Sn(R 21 ) 2 , C=O, C=S, C=Se, C=NR 21 , P(=O)(R 21 ), SO, SO 2 , N.R. 21 , O, S or CONR 21 Optionally replaced by; C 1 ~C 40 -alkoxy, This may be one or more substituents R 21 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 21 C=CR 21 , C≡C, Si(R 21 ) 2 , Ge(R 21 ) 2 , Sn(R 21 ) 2 , C=O, C=S, C=Se, C=NR 21 , P(=O)(R 21 ), SO, SO 2 , N.R. 21 , O, S or CONR 21 Optionally replaced by; C 1 ~C 40 -thioalkoxy, This may be one or more substituents R 21 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 21 C=CR 21 , C≡C, Si(R 21 ) 2 , Ge(R 21 ) 2 , Sn(R 21 ) 2 , C=O, C=S, C=Se, C=NR 21 , P(=O)(R 21 ), SO, SO 2 , N.R. 21 , O, S or CONR 21 Optionally replaced by; C2 ~C 40 -alkenyl, This may be one or more substituents R 21 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 21 C=CR 21 , C≡C, Si(R 21 ) 2 , Ge(R 21 ) 2 , Sn(R 21 ) 2 , C=O, C=S, C=Se, C=NR 21 , P(=O)(R 21 ), SO, SO 2 , N.R. 21 , O, S or CONR 21 Optionally replaced by; C 2 ~C 40 -alkynyl, This may be one or more substituents R 21 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 21 C=CR 21 , C≡C, Si(R 21 ) 2 , Ge(R 21 ) 2 , Sn(R 21 ) 2 , C=O, C=S, C=Se, C=NR 21 , P(=O)(R 21 ), SO, SO 2 , N.R. 21 , O, S or CONR 21 Optionally replaced by; C 6 ~C 60 -aryl, This may be one or more substituents R 21 optionally replaced by; C 3 ~C 57 Heteroaryl, This may be one or more substituents R21 optionally replaced by selected from the group consisting of; wherein optionally one or more adjacent pairs of groups, R VI and R VII , R VII and R VIII , R VIII and R IX , R X and R XI , R XI and R XII , R XII and R XIII , R XIV and R XV , R XV and R XVI , R XVI and R XVII , R XVII and R XVIII , R XIX and R XX , R XX and R XXI , R XXI and R XXII , R XXII and R XXIII form an aromatic ring system, which has the general formula S B -III-3a is fused to the adjacent benzene ring a, b, c or d of the formula III-3a, which is fused to one or more substituents R 21 optionally replaced by; In some cases, R VI and R XXIII , R XIII and R XIV One or both pairs of 4 A group, which in each occurrence can independently be a direct bond, a CR 22 R 23 , C=CR 22 R 23 , C=O, C=NR 22 , N.R. 22 , O, SiR 22 R 23 , S, S(O) and S(O) 2 selected from the group consisting of; R 21 Each occurrence independently represents hydrogen, deuterium, OPh, SPh, or CF3 , CN, F, Si(C 1 ~C 5 -alkyl) 3 , Si(Ph) 3 , C 1 ~C 5 -alkyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -alkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -thioalkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkenyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkynyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 6 ~C 18 -aryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; C 3 ~C 17 Heteroaryl, This can be one or more C 1 ~C 5 - optionally substituted with alkyl substituents; N(C6 -C 18 -aryl) 2 , N(C 3 -C 17 -heteroaryl) 2 ; and N(C 3 -C 17 -heteroaryl)(C 6 -C 18 -aryl) selected from the group consisting of; R 22 and R 23 Each occurrence independently represents hydrogen, deuterium, N(R 24 ) 2 , OR 24 , Si(R 24 ) 3 , B(OR 24 ) 2 , O.S.O. 2 R 24 , C.F. 3 ,CN,F,Br,I, C 1 ~C 40 -alkyl, This may be one or more substituents R 24 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 24 C=CR 24 , C≡C, Si(R 24 ) 2 , Ge(R 24 ) 2 , Sn(R 24 ) 2 , C=O, C=S, C=Se, C=NR 24 , P(=O)(R 24 ), SO, SO 2 , N.R. 24 , O, S or CONR 24 Optionally replaced by; C 1 ~C 40 -alkoxy, This may be one or more substituents R 24 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 24 C=CR 24 , C≡C, Si(R 24 ) 2 , Ge(R 24 ) 2 , Sn(R 24 ) 2 , C=O, C=S, C=Se, C=NR 24 , P(=O)(R 24 ), SO, SO 2 , N.R. 24 , O, S or CONR 24 Optionally replaced by; C 1 ~C 40 -Thioalkoxy This may be one or more substituents R 24 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 24 C=CR 24 , C≡C, Si(R 24 ) 2 , Ge(R 24 ) 2 , Sn(R 24 ) 2 , C=O, C=S, C=Se, C=NR 24 , P(=O)(R 24 ), SO, SO 2 , N.R. 24 , O, S or CONR 24 Optionally replaced by; C 2 ~C 40 -alkenyl, This may be one or more substituents R 24 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 24 C=CR 24 , C≡C, Si(R 24 ) 2 , Ge(R 24 ) 2 , Sn(R 24 ) 2, C=O, C=S, C=Se, C=NR 24 , P(=O)(R 24 ), SO, SO 2 , N.R. 24 , O, S or CONR 24 Optionally replaced by; C 2 ~C 40 -alkynyl, This may be one or more substituents R 24 optionally replaced by; wherein one or more non-adjacent CH 2 The - group is R 24 C=CR 24 , C≡C, Si(R 24 ) 2 , Ge(R 24 ) 2 , Sn(R 24 ) 2 , C=O, C=S, C=Se, C=NR 24 , P(=O)(R 24 ), SO, SO 2 , N.R. 24 , O, S or CONR 24 Optionally replaced by; C 6 ~C 60 -aryl, This may be one or more substituents R 24 optionally replaced by; C 3 ~C 57 Heteroaryl, This may be one or more substituents R 24 optionally replaced by selected from the group consisting of; R 24 Each occurrence independently represents hydrogen, deuterium, OPh, SPh, or CF 3 , CN, F, Si(C 1 ~C 5 -alkyl) 3 , Si(Ph) 3 , C 1 ~C 5 -alkyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -alkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 1 ~C 5 -thioalkoxy, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkenyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 2 ~C 5 -alkynyl, In the formula, optionally, one or more hydrogen atoms are independently selected from deuterium, CN, CF 3 or replaced by F; C 6 ~C 18 -aryl, This can be one or more C 1 -C 5 - optionally substituted with alkyl substituents; C 3 ~C 17 Heteroaryl, This can be one or more C 1 -C 5 - optionally substituted with alkyl substituents; N(C 6 ~C 18 -aryl) 2 , N(C 3 ~C 17 -heteroaryl) 2 ; and N(C 3 ~C17 -heteroaryl)(C 6 -C 18 -aryl) selected from the group consisting of; R A is hydrogen, C 3 ~C 15 -heteroaryl, where optionally one or more hydrogen atoms are independently selected from deuterium, halogen, C 1 ~C 5 -Alkyl, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl), C 3 ~C 15 -substituted by heteroaryl, and C 6 ~C 18 -aryl, where optionally one or more hydrogen atoms are independently selected from the group consisting of C 1 ~C 5 -Alkyl, CN, CF 3 and replaced by Ph; And C 6 ~C 18 -aryl, where optionally one or more hydrogen atoms are independently C 1 ~C 5 -Alkyl, CN, CF 3 and Ph, this is Me, i Pr, t Bu, CN, CF 3 and Ph; Pyridinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph; Pyrimidinyl, which is Me, i Pr, t Bu, CN, CF 3and Ph; Triazinyl, which is Me, i Pr, t Bu, CN, CF 3 and Ph, optionally substituted with one or more substituents independently selected from the group consisting of are substituted by substituents independently selected from the group consisting of is selected from the group consisting of:

[0145] In a highly preferred embodiment of the present invention, R A teeth, C 3 ~C 15 -heteroaryl, where optionally one or more hydrogen atoms are independently selected from deuterium, halogen, C 1 ~C 5 -Alkyl, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl), C 3 ~C 15 -substituted by heteroaryl, and C 6 ~C 18 -aryl, where optionally one or more hydrogen atoms are independently selected from the group consisting of C 1 ~C 5 -Alkyl, CN, CF 3 and replaced by Ph is selected from the group consisting of:

[0146] In a particularly preferred embodiment of the present invention, R A teeth, C 3 ~C 15 -heteroaryl, where optionally one or more hydrogen atoms are independently selected from deuterium, halogen, C 1 ~C 5 -Alkyl, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl), C3 ~C 15 -substituted by heteroaryl, and C 6 ~C 18 -aryl, where optionally one or more hydrogen atoms are independently selected from the group consisting of C 1 ~C 5 -Alkyl, CN, CF 3 and is replaced by Ph, In the formula, formula S B -III-3a by R A The binding site of C 3 ~C 15 -C of heteroaryl 3 ~C 15 -One of the carbon atoms is selected from the group consisting of:

[0147] In one embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-7, S B -III-3a-8, S B -III-3a-9, S B -III-3a-10, S B -III-3a-11, S B -III-3a-12, S B -III-3a-13, S B -III-3a-14, S B -III-3a-15, S B -III-3a-16, S B -III-3a-17, S B -III-3a-18, S B -III-3a-19, S B -III-3a-20, S B -III-3a-21, S B -III-3a-22, SB -III-3a-23, S B -III-3a-24, S B -III-3a-25, S B -III-3a-26, S B -III-3a-27, S B -III-3a-28, S B -III-3a-29, S B -comprising or consisting of a structure according to any of III-3a-30:

[0148] [ka] [ka] [ka] [ka]

[0149] In a preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-9 and S B -comprising or consisting of a structure according to any of III-3a-10: [ka]

[0150] In a preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a, S B-III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-7, S B -III-3a-8, S B -III-3a-9, S B -III-3a-10, S B -III-3a-11, S B -III-3a-12, S B -III-3a-13, S B -III-3a-14, S B -III-3a-15, S B -III-3a-16, S B -III-3a-17, S B -III-3a-18, S B -III-3a-19, S B -III-3a-20, S B -III-3a-21, S B -III-3a-22, S B -III-3a-23, S B -III-3a-24, S B -III-3a-25, S B -III-3a-26, S B -III-3a-27, S B -III-3a-28, S B -III-3a-29, S B -III-3a-30, wherein R A is hydrogen or a group of formula R A -I, R A -II, R A -III, R A -IV, R A -V, R A -VI, R A -VII, R A -VIII, R A -IX, R A -X, R A -XI, R A-XII and R A -XIII, [ka] During the ceremony, The dotted line indicates the binding site to the core structure; Q 5 Each occurrence independently represents nitrogen (N) and R 25 selected from the group consisting of; X 3 Each occurrence independently represents oxygen (O), sulfur (S), carbon (C), or ruthenium (R). 25 ) 2 and N.R. 25 selected from the group consisting of; R 25 Each occurrence independently represents hydrogen, deuterium, halogen, C 1 ~C 5 -Alkyl, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl) and C 6 ~C 18 -aryl, which is C 1 ~C 5 -Alkyl, CN, CF 3 , C 6 ~C 18 -aryl and C 3 ~C 15 - optionally substituted with one or more substituents independently selected from the group consisting of heteroaryl; C 3 ~C 15 -heteroaryl, which is C 1 ~C 5 -Alkyl, CN, CF 3 , C 6 ~C 18 -aryl and C 3 ~C 15 -heteroaryl, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; R 26Each occurrence independently represents hydrogen, deuterium, halogen, C 1 ~C 5 -Alkyl, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl) and C 6 ~C 18 -aryl, which is C 1 ~C 5 -Alkyl, CN, CF 3 , C 6 ~C 18 -aryl and C 3 ~C 15 - optionally substituted with one or more substituents independently selected from the group consisting of heteroaryl; C 3 ~C 15 -heteroaryl, which is C 1 ~C 5 -Alkyl, CN, CF 3 , C 6 ~C 18 -aryl and C 3 ~C 15 -heteroaryl, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; wherein two or more adjacent substituents R 25 and / or R 26 is C 3 ~C 30 -Aromatic or C 3 ~C 15 - optionally forming an aromatic heterocyclic ring system, In the formula, formula R A -III, R A -IV, R A -V and R A -At least one Q in VI 5 is N; In the formula, formula R A -III, R A -IV, R A -V and R A In -VI, two adjacent groups Q 5cannot both be N.

[0151] In an even more preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a, S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-7, S B -III-3a-8, S B -III-3a-9, S B -III-3a-10, S B -III-3a-11, S B -III-3a-12, S B -III-3a-13, S B -III-3a-14, S B -III-3a-15, S B -III-3a-16, S B -III-3a-17, S B -III-3a-18, S B -III-3a-19, S B -III-3a-20, S B -III-3a-21, S B -III-3a-22, S B -III-3a-23, S B -III-3a-24, S B -III-3a-25, S B -III-3a-26, S B -III-3a-27, S B -III-3a-28, S B -III-3a-29, S B -III-3a-30, wherein R A is hydrogen or a group of formula R A -I, R A -II, R A -III, R A-IV, R A -V, R A -VI, R A -VII, R A -VIII, R A -IX, R A -X, R A -XI, R A -XII and R A -XIII; In the formula, R 26 Each occurrence is hydrogen.

[0152] In an even more preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a, S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-7, S B -III-3a-8, S B -III-3a-9, S B -III-3a-10, S B -III-3a-11, S B -III-3a-12, S B -III-3a-13, S B -III-3a-14, S B -III-3a-15, S B -III-3a-16, S B -III-3a-17, S B -III-3a-18, S B -III-3a-19, S B -III-3a-20, S B -III-3a-21, S B -III-3a-22, S B -III-3a-23, S B -III-3a-24, S B -III-3a-25, S B-III-3a-26, S B -III-3a-27, S B -III-3a-28, S B -III-3a-29, S B -III-3a-30, wherein R A is hydrogen or a group of formula R A -Ia, R A -Ib, R A -Ic, R A -Id, R A -Ie, R A -If, R A -Ig, R A -IIIa, R A -IIIb, R A -IVa, R A -IVb, R A -Va, R A -Vb, R A -Vc, R A -Vd, R A -Ve, R A -Vf, R A -VIa, R A -VIb, R A -VIc, R A -VId, R A -VIe, R A - VIf, R A -VII, R A -VIIIa, R A -VIIIb, R A -VIIIc, R A -IXa, R A -IXb and R A -IXc,

[0153] [ka] [ka]

[0154] During the ceremony, The dotted line indicates the binding site to the core structure; R 25Each occurrence independently represents hydrogen, deuterium, or C. 1 ~C 5 -Alkyl, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl) and C 6 ~C 18 -aryl, which is C 1 ~C 5 -Alkyl, CN, CF 3 , C 6 ~C 18 -aryl and C 3 ~C 15 - optionally substituted with one or more substituents independently selected from the group consisting of heteroaryl; C 3 ~C 15 -heteroaryl, which is C 1 ~C 5 -Alkyl, CN, CF 3 , C 6 ~C 18 -aryl and C 3 ~C 15 -heteroaryl, optionally substituted with one or more substituents independently selected from the group consisting of selected from the group consisting of; In the formula, adjacent groups R 25 do not combine to form additional ring systems of any kind.

[0155] In a still further more preferred embodiment of the present invention, R 25 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl) and C 6 ~C 18 -aryl, which is Me, i Pr, t Bu, CN, CF 3and Ph; C 3 ~C 15 heteroaryl, which is Me, i Pr, t Bu, CN, CF 3 , C 6 ~C 18 - optionally substituted with one or more substituents independently selected from the group consisting of aryl and Ph; selected from the group consisting of; During the ceremony, Adjacent group R 25 do not combine to form additional ring systems of any kind.

[0156] In a still further more preferred embodiment of the present invention, R 25 Each occurrence independently represents hydrogen, deuterium, Me, i Pr, t Bu, CN, CF 3 , SiMe 3 , SiPh 3 (Ph=phenyl) and Ph, this is Me, i Pr, t Bu, CN, CF 3 and Ph; During the ceremony, Adjacent group R 25 do not combine to form additional ring systems of any kind.

[0157] In one embodiment, R VI , R VII , R VIII , R IX , R X , R XI , R XII , R XIII , R XIV , R XV , R XVI , R XVII , R XVIII , R XIX , RXX , R XXI , R XXII and R XXIII are, independently of each other, hydrogen, deuterium, halogen, CN, CF 3 , SiMe 3 , SiPh 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17 -heteroaryl, CN or CF 3 Optionally replaced by; C 3 ~C 15 Heteroaryl, wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17 -heteroaryl, CN or CF 3 Optionally replaced by; and N(Ph) 2 selected from the group consisting of; wherein optionally at least one adjacent pair of groups, R VI and R VII , R VII and R VIII , R VIII and R IX is the formula S B -III-3a, forming an aromatic ring system fused to the adjacent benzene ring a, and / or optionally at least one adjacent pair of groups, R X and R XI , R XIand R XII , R XII and R XIII is represented by the general formula S B - forming an aromatic ring system fused to the adjacent benzene ring b of III-3a; wherein each of the aromatic ring systems thus formed optionally contains 3 to 30 carbon atoms and contains one or more substituents R 21 optionally replaced by; wherein it is particularly preferred that the two aromatic ring systems thus formed are identical; In some cases, R VI and R XXIII , R XIII and R XIV One or both pairs of 4 A group, which in each occurrence can independently be a direct bond, a CR 22 R 23 , C=CR 22 R 23 , C=O, C=NR 22 , N.R. 22 , O, SiR 22 R 23 , S, S(O) and S(O) 2 selected from the group consisting of; In the formula, R 21 , R 22 and R 23 Each occurrence independently represents hydrogen, deuterium, halogen, CN, CF 3 , SiMe 3 , SiPh 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17-heteroaryl, CN or CF 3 are independently substituted by; C 3 ~C 15 Heteroaryl, wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17 -heteroaryl, CN or CF 3 are independently substituted by; and N(Ph) 2 is selected from the group consisting of:

[0158] In an even more preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a, S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-9, S B -comprising or consisting of a structure according to any of III-3a-10; In the formula, R VI , R VII , R VIII , R IX , R X , R XI , R XII , R XIII , R XIV , R XV , R XVI , R XVII , R XVIII , R XIX , R XX , R XXI , R XXII and R XXIII are, independently of each other, hydrogen, deuterium, halogen, CN, CF 3, SiMe 3 , SiPh 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17 -heteroaryl, CN or CF 3 are independently substituted by; C 3 ~C 15 Heteroaryl, wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17 -heteroaryl, CN or CF 3 are independently substituted by; and N(Ph) 2 selected from the group consisting of; wherein optionally at least one adjacent pair of groups, R VI and R VII , R VII and R VIII , R VIII and R IX is the formula S B -III-3a, forming an aromatic ring system fused to the adjacent benzene ring a, and / or optionally at least one adjacent pair of groups, R X and R XI , R XI and R XII , R XII and R XIII is represented by the general formula S B - forming an aromatic ring system fused to the adjacent benzene ring b of III-3a; wherein each of the aromatic ring systems thus formed optionally contains 3 to 30 carbon atoms and contains one or more substituents R 21 optionally replaced by; wherein it is particularly preferred that the two aromatic ring systems thus formed are identical; In some cases, R VI and R XXIII , R XIII and R XIV One or both pairs of 4 A group, which in each occurrence can independently be a direct bond, a CR 22 R 23 , C=CR 22 R 23 , C=O, C=NR 22 , N.R. 22 , O, SiR 22 R 23 , S, S(O) and S(O) 2 selected from the group consisting of; In the formula, R 21 , R 22 and R 23 Each occurrence independently represents hydrogen, deuterium, halogen, CN, CF 3 , SiMe 3 , SiPh 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17 -heteroaryl, CN or CF 3 are independently substituted by; C 3 ~C 15 Heteroaryl, wherein optionally one or more hydrogen atoms are C 1 ~C 5 -Alkyl, C 6 ~C 18 -aryl, C 3 ~C 17 -heteroaryl, CN or CF 3 are independently substituted by; and N(Ph) 2 is selected from the group consisting of:

[0159] In an even more preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a, S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-9, S B -III-3a-10, In the formula, R VI , R VII , R VIII , R IX , R X , R XI , R XII , R XIII , R XIV , R XV , R XVI , R XVII , R XVIII , R XIX , R XX , R XXI , R XXII and R XXIII are, independently of each other, hydrogen, deuterium, CN, CF 3 , SiMe 3 , SiPh 3 , N(Ph) 2 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, wherein optionally one or more hydrogen atoms are Me, i Pr, t Bu, CN, CF 3 or independently substituted by Ph; C 3 ~C 15 Heteroaryl, wherein optionally one or more hydrogen atoms are Me, i Pr, t Bu, CN, CF 3 or independently substituted by Ph; wherein optionally at least one adjacent pair of groups, R VI and R VII , R VII and R VIII , R VIII and R IX is the formula S B -III-3a, forming an aromatic ring system fused to the adjacent benzene ring a, and / or optionally at least one adjacent pair of groups, R X and R XI , R XI and R XII , R XII and R XIII is represented by the general formula S B - forming an aromatic ring system fused to the adjacent benzene ring b of III-3a, wherein each of the aromatic ring systems optionally thus formed contains from 3 to 30 carbon atoms; It is particularly preferred that the two aromatic ring systems thus formed are identical; In some cases, R VI and R XXIII , R XIII and R XIV One or both pairs of 4 A group, which in each occurrence can independently be a direct bond, a CR 22 R 23 , C=CR 22 R23 , C=O, C=NR 22 , N.R. 22 , O, SiR 22 R 23 , S, S(O) and S(O) 2 selected from the group consisting of; In the formula, R 22 and R 23 Each occurrence independently represents hydrogen, deuterium, CN, or CF 3 , SiMe 3 , SiPh 3 , C 1 ~C 5 -alkyl, wherein one or more hydrogen atoms are optionally replaced by deuterium; C 6 ~C 18 -aryl, wherein optionally one or more hydrogen atoms are Me, i Pr, t Bu, CN, CF 3 or independently substituted by Ph; C 3 ~C 15 Heteroaryl, wherein optionally one or more hydrogen atoms are Me, i Pr, t Bu, CN, CF 3 or Ph.

[0160] In a preferred embodiment of the present invention, R VI , R VII , R VIII , R IX , R X , R XI , R XII , R XIII , R XIV , R XV , R XVI , R XVII , R XVIII , R XIX , R XX , R XXI , R XXII and R XXIII is hydrogen, deuterium, Me,i Pr, t Bu, CN, CF 3 , N(Ph) 2 and Ph, where one or more hydrogen atoms are deuterium, Me, i Pr, t Bu, CN, CF 3 Optionally replaced by; In some cases, R VI and R XXIII , R XIII and R XIV One or both pairs of are combined to form Z 4 A group is formed which, in each occurrence, is a direct bond.

[0161] In a particularly preferred embodiment of the present invention, at least one small FWHM emitter S B Each of the formulas S B -III-3a, S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-9, S B -III-3a-10, In the formula, R VI , R VII , R VIII , R IX , R X , R XI , R XII , R XIII , R XIV , R XV , R XVI , R XVII , R XVIII , R XIX , R XX , R XXI , R XXII and R XXIII are, independently of each other, hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 , N(Ph) 2 and Ph, where one or more hydrogen atoms are deuterium, Me, i Pr, t Bu, CN, CF 3 Optionally replaced by selected from the group consisting of; In some cases, R VI and R XXIII , R XIII and R XIV One or both pairs of 4 A group is formed which, in each occurrence, is a direct bond.

[0162] Small FWHM emitter S for use in an organic electroluminescent device according to the present invention B Examples are listed below, where the invention is, of course, not limited to devices that contain one of these molecules.

[0163] formula S B -III-3a-1 small FWHM light emitter S B Examples are listed below:

[0164] [ka]

[0165] formula S B -III-3a-2 small FWHM light emitter S B Examples are listed below:

[0166] [ka] [ka] [ka]

[0167] formula SB -III-3a-3, S B -III-3a-4, S B -III-3a-5 and S B -III-3a-6 Small FWHM emitter S B Examples are listed below: [ka]

[0168] formula S B -III-3a-9: Small FWHM emitter S B Examples are listed below: [ka]

[0169] Small FWHM illuminant S B The synthesis of formula S can be accomplished via standard reactions and reaction conditions known to those skilled in the art. B - a light emitter with a small FWHM that includes or consists of the structure III-3a B An example of a typical reaction scheme for XVIII =R XIX , R XVII =R XX , R XVI =R XXI , R XV =R XXII , R XIV =R XXIII , R XIII =R VI , R XII =R VII , R XI =R VIII and R X =R IX Is: [ka]

[0170] 1,3-Dibromo-2,5-dichlorobenzene (CAS: 81067-41-6, 1.00 equiv.), E1 (2.20 equiv.), tris(dibenzylideneacetone)dipalladium Pd 2 (dba) 3 (0.02 equivalents, CAS: 51364-51-3), tri-tert-butyl-phosphine (P( t Bu) 3、 CAS: 13716-12-6, 0.08 equivalents) and sodium tert-butoxide (NaO t Bu; 6.00 equiv.) is stirred in toluene at 80° C. for 2 h under nitrogen atmosphere. After cooling to room temperature (rt), the reaction mixture is extracted with toluene and brine and the phases are separated. The combined organic layers are washed with MgSO 4 The resulting crude product is purified by recrystallization or column chromatography to give I1 as a solid.

[0171] [ka]

[0172] I1 (1.00 equiv.), E2 (2.20 equiv., tris(dibenzylideneacetone)dipalladium Pd 2 (dba) 3 (0.02 equiv.; CAS: 51364-51-3), tri-tert-butyl-phosphine (0.08 equiv., P( t Bu) 3 , CAS: 13716-12-6) and sodium tert-butoxide (NaO t Bu; 5.00 equiv.) is stirred in toluene at 100° C. for 5 h under nitrogen atmosphere. After cooling to room temperature (rt), the reaction mixture is extracted with toluene and brine and the phases are separated. The combined organic layers are washed with MgSO 4 The mixture is dried at rt and then the solvent is removed under reduced pressure. The resulting crude product is purified by recrystallization or column chromatography to give I2 as a solid.

[0173] [ka]

[0174] I2 (1 equivalent) was dissolved in THF under a nitrogen atmosphere and cooled to -20 °C, or dissolved in tert-butylbenzene and cooled to -10 °C, t BuLi (2 equiv., CAS: 594-19-4) is added and the reaction mixture is stirred at 0° C. After the lithiation is complete, the reaction is quenched, 1,3,2-dioxaborolane (2 equiv., CAS: 61676-62-8) is added and the reaction mixture is stirred at reflux at 70° C. for 2 h. After cooling to room temperature (rt), the reaction mixture is extracted between toluene and brine and the phases are separated. The combined organic layers are washed with MgSO 4 The mixture is dried at rt and then the solvent is removed under reduced pressure. The resulting crude product is purified by recrystallization or column chromatography to give I3 as a solid.

[0175] [ka]

[0176] I3 (1 eq.), N,N-diisopropylethylamine (10 eq., CAS: 7087-68-5) and AlCl 3 (10 equiv., CAS: 7446-70-0) is stirred in chlorobenzene at 120 °C for 16 h under nitrogen atmosphere. After cooling to room temperature (rt), the reaction mixture is extracted between toluene and brine and the phases are separated. The combined organic layers are washed with MgSO 4 The resulting crude product is purified by recrystallization or column chromatography to give I4 as a solid.

[0177] [ka]

[0178] I4 (1 eq.), E3 (1.1 eq.), palladium(II) acetate (CAS: 3375-31-3, 0.1 eq.), S-Phos (CAS: 657408-07-6, 0.24 eq.) and potassium phosphate tribasic (5 eq.) are stirred in dioxane / water 5:1 under nitrogen atmosphere at 100 °C for 16 h. After cooling to room temperature (rt), the reaction mixture is extracted between toluene and brine and the phases are separated. The combined organic layers are washed with MgSO 4 The mixture is dried at rt and then the solvent is removed under reduced pressure. The resulting crude product is purified by recrystallization or column chromatography to give P1 as a solid.

[0179] Further FWHM of the illuminant S B can be obtained similarly. B can also be obtained by any alternative synthetic route suitable for this purpose.

[0180] In a preferred embodiment of the present invention, each TADF material E contained in at least one emitting layer B B is the formula E B -I, and each FWHM of a light emitter S contained in at least one light emitting layer B B is the formula S B -I

[0181] In an even more preferred embodiment of the present invention, each TADF material E contained in at least one emissive layer B B is the formula E B -I-1, E B -I-2, E B -I-3, E B -I-4, E B -I-5, E B -I-6, E B -I-7 and E B -I-8, and each FWHM light emitter S contained in at least one light emitting layer B B Each of the formulas S B -II, S B -III and S B -IV.

[0182] In an even more preferred embodiment of the present invention, each TADF material E contained in at least one emissive layer B B is the formula E B -I-1a, E B -I-2a, E B -I-3a, E B -I-4a, E B -I-5a, E B -I-6a, E B -I-7 and E B -I-8, and each FWHM of the luminescent material S contained in at least one luminescent layer B B is the formula S B -III-3a.

[0183] In an even more preferred embodiment of the present invention, each TADF material E contained in at least one emissive layer B B is the formula E B -I-1a-1, E B -I-2a-1, E B -I-3a-1, E B -I-4a-1, E B -I-5a-1, E B -I-6a-1, E B -I-7 and E B -I-8, and each FWHM of the luminescent material S contained in at least one luminescent layer B B is the formula S B -III-3a.

[0184] In an even more preferred embodiment of the present invention, each TADF material E contained in at least one emissive layer B B is the formula E B -I-3a-1a, E B -I-3a-1b, E B -I-5a-1a and E B -I-6a-1a, and each FWHM of the light emitter S contained in at least one light emitting layer B B is the formula SB -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-9 and S B -III-3a-10.

[0185] In a particularly preferred embodiment of the present invention, each TADF material E contained in at least one emitting layer B B is the formula E B -I-3a-1a, E B -I-3a-1b, E B -I-5a-1a and E B -I-6a-1a, and each FWHM of the light emitter S contained in at least one light emitting layer B B is the formula S B -III-3a-1, S B -III-3a-2, S B -III-3a-3, S B -III-3a-4, S B -III-3a-5, S B -III-3a-6, S B -III-3a-9 and S B -III-3a-10.

[0186] In a particularly preferred embodiment of the present invention, each TADF material E contained in at least one emitting layer B B has a structure according to any of the particularly preferred examples shown in the present specification, and each FWHM of the light emitter S contained in at least one light emitting layer B B has a structure according to any of the particularly preferred examples shown herein.

[0187] Relationship between HOMO and LUMO energy levels of components in the emitting layer B In a preferred embodiment of the present invention, at least one p-host HP is present in the light-emitting layer B, the following formulas (20) to (22): E LUMO (H P )>E LUMO (E B ) (20) E HOMO (H P )≦E HOMO (S B ) (twenty one) E LUMO (H P )>E LUMO (S B ) (twenty two) Preferably, one or more or all of the relationships expressed by

[0188] In a preferred embodiment of the present invention, at least one p-host H P and at least one n-host H N is present in the light-emitting layer B, the following formulas (18) to (22): E HOMO (H P )>E HOMO (H N ) (18) E LUMO (H P )>E LUMO (H N ) (19) E LUMO (H P )>E LUMO (E B ) (20) E HOMO (H P )≦E HOMO (S B ) (twenty one) E LUMO (H P )>E LUMO (S B ) (twenty two) Preferably, one or more or all of the relationships expressed by

[0189] In a preferred embodiment of the present invention, at least one p-host H Pand at least one n-host H N and at least one bipolar host H BP is present in the light-emitting layer B, the following formulas (18) to (23): E HOMO (H P )>E HOMO (H N ) (18) E LUMO (H P )>E LUMO (H N ) (19) E LUMO (H P )>E LUMO (E B ) (20) E HOMO (H P )≦E HOMO (S B ) (twenty one) E LUMO (H P )>E LUMO (S B ) (twenty two) E LUMO (H P )>E LUMO (H BP ) (twenty three) Preferably, one or more or all of the relationships expressed by

[0190] Thus, the p-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention P represents an n-host H optionally contained in at least one emitting layer B of an organic electroluminescent device according to the invention N The highest occupied molecular orbital HOMO(H N ) of energy E HOMO (H N ), preferably higher than the energy E HOMO (H P ) with the highest occupied molecular orbital HOMO(H P ).

[0191] Furthermore, the p-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention P represents an n-host H optionally contained in at least one emitting layer B of an organic electroluminescent device according to the present invention N The lowest unoccupied molecular orbital LUMO(H N ) of energy E LUMO (H N ), preferably higher than the energy E LUMO (H P ) with the lowest unoccupied molecular orbital LUMO(H P ).

[0192] In addition, the p-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention P represents a TADF material E contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention; B The lowest unoccupied molecular orbital LUMO (E B ) of energy E LUMO (E B ), preferably higher than the energy E LUMO (H P ) with the lowest unoccupied molecular orbital LUMO(H P ).

[0193] The p-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention P represents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The highest occupied molecular orbital HOMO(S B ) of energy E HOMO (S B ), preferably lower than or equal to the energy E HOMO (H P ) with the highest occupied molecular orbital HOMO(H P ).

[0194] Furthermore, the p-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention P represents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The lowest unoccupied molecular orbital LUMO(S B ) of energy E LUMO (S B ), preferably higher than the energy E LUMO (H P ) with the lowest unoccupied molecular orbital LUMO(H P ).

[0195] In addition, the p-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention P represents a bipolar host H optionally contained in at least one light-emitting layer B of an organic electroluminescent device according to the invention; BP The lowest unoccupied molecular orbital LUMO(H BP ) of energy E LUMO (H BP ), preferably higher than the energy E LUMO (H P ) with the lowest unoccupied molecular orbital LUMO(H P ).

[0196] In a preferred embodiment of the present invention, the p-host H P is the light-emitting layer E B Insofar as present in the formula (26) and / or (27): -0.3 eV ≤ E HOMO (H P )-E HOMO (E B )≦0.3 eV (26) E LUMO (H P )-E LUMO (E B )≧0.3eV (27) In one embodiment, one or both of the relationships selected from the group consisting of:

[0197] In a preferred embodiment of the present invention, the p-host H P and n-host H N is the light-emitting layer E B As long as it exists in the following formulas (24) to (27): E HOMO (H P )-E HOMO (H N ) ≧ 0.3 eV (24) E LUMO (H P )-E LUMO (H N )≧0.3eV (25) -0.3 eV ≤ E HOMO (H P )-E HOMO (E B )≦0.3 eV (26) E LUMO (H P )-E LUMO (E B )≧0.3eV (27) Preferably, one or more or all of the relationships selected from the group consisting of:

[0198] In a preferred embodiment of the present invention, the p-host H P and n-host H N and bipolar host H BP is the light-emitting layer E B As long as it exists in the following formulas (24) to (28): E HOMO (H P )-E HOMO (H N ) ≧ 0.3 eV (24) E LUMO (H P )-E LUMO (H N )≧0.3eV (25) -0.3 eV ≤ E HOMO (H P )-E HOMO (E B )≦0.3 eV (26) E LUMO (H P )-E LUMO (EB )≧0.3eV (27) E LUMO (H P )-E LUMO (H BP )≧0.3eV (28) Preferably, one or more or all of the relationships selected from the group consisting of:

[0199] Therefore, in a preferred embodiment of the present invention, the p-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention P is the energy E HOMO (H P ) with the highest occupied molecular orbital HOMO(H P ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention, N is the energy E HOMO (H N ) with the highest occupied molecular orbital HOMO(H N ), wherein preferably: E HOMO (H P )-E HOMO (H N ) ≧0.3 eV. In other words, E HOMO (H P ) and E HOMO (H N ) is preferably 0.3 eV or more.

[0200] In a preferred embodiment of the present invention, the p-host H P is the energy E LUMO (H P ) with the lowest unoccupied molecular orbital LUMO(H P ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention, N is the energy E LUMO (H N ) with the lowest unoccupied molecular orbital LUMO(HN ), wherein preferably: E LUMO (H P )-E LUMO (H N ) ≧0.3 eV. In other words, E LUMO (H P ) and E LUMO (H N ) is preferably 0.3 eV or more.

[0201] In a preferred embodiment of the present invention, the p-host H P is the energy E HOMO (H P ) with the highest occupied molecular orbital HOMO(H P ) and the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention. B is the energy E HOMO (E B ) with the highest occupied molecular orbital HOMO (E B ), where preferably: -0.3 eV≦E HOMO (H P )-E HOMO (E B In other words, the p-host H contained in at least one light-emitting layer B of the organic electroluminescence device according to the present invention is ≦0.3 eV. P HOMO(H P ) is a TADF emitter E contained in at least one emitting layer B of an organic electroluminescent device according to the present invention B HOMO(E B ), but the energy difference preferably does not exceed 0.3 eV.

[0202] In a preferred embodiment of the present invention, the p-host H P is the energy E HOMO (H P ) with the lowest unoccupied molecular orbital LUMO(HP ) and the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention. B is the energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E B ), wherein preferably: E LUMO (H P )-E LUMO (E B ) ≧0.3 eV. In other words, E LUMO (H P ) and E LUMO (E B ) is preferably 0.3 eV or more.

[0203] In a preferred embodiment of the present invention, the p-host H P is the energy E LUMO (H P ) with the lowest unoccupied molecular orbital LUMO(H P ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention is a bipolar host H BP is the energy E LUMO (H BP ) with the lowest unoccupied molecular orbital LUMO(H BP ), wherein preferably: E LUMO (H P )-E LUMO (H BP ) ≧0.3 eV. In other words, E LUMO (H P ) and E LUMO (H BP ) is preferably 0.3 eV or more.

[0204] In a preferred embodiment of the present invention, the n-host H N is the light-emitting layer E B As long as it exists in the following formulas (29) to (32): E HOMO (H N )≦E HOMO(E B ) (29) E LUMO (H N )≦E LUMO (E B ) (30) E HOMO (H N ) <E HOMO (S B ) (31) E LUMO (H N ) <E LUMO (S B ) (32) Preferably, one or more or all of the relationships expressed by

[0205] In a preferred embodiment of the present invention, the n-host H N and bipolar host H BP is the light-emitting layer E B As long as it exists in the following formulas (29) to (33): E HOMO (H N )≦E HOMO (E B ) (29) E LUMO (H N )≦E LUMO (E B ) (30) E HOMO (H N ) <E HOMO (S B ) (31) E LUMO (H N ) <E LUMO (S B ) (32) E HOMO (H N ) <E HOMO (H BP ) (33) Preferably, one or more or all of the relationships expressed by

[0206] Thus, the n-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the inventionN represents a TADF material E contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention; B The highest occupied molecular orbital HOMO(E B ) of energy E HOMO (E B ), preferably lower than or equal to the energy E HOMO (H N ) with the highest occupied molecular orbital HOMO(H N ).

[0207] Furthermore, the n-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention N represents a TADF material E contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention; B The lowest unoccupied molecular orbital LUMO (E B ) of energy E LUMO (E B ) preferably equal to or lower than the energy E LUMO (H N ) with the lowest unoccupied molecular orbital LUMO(H N ).

[0208] In addition, the n-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention N represents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The highest occupied molecular orbital HOMO(S B ) of energy E HOMO (S B ), preferably lower than the energy E HOMO (H N ) with the highest occupied molecular orbital HOMO(H N ).

[0209] n-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention Nrepresents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The lowest unoccupied molecular orbital LUMO(S B ) of energy E LUMO (S B ), preferably lower than the energy E LUMO (H N ) with the lowest unoccupied molecular orbital LUMO(H N ).

[0210] Furthermore, the n-host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention N represents a bipolar host H optionally contained in at least one light-emitting layer B of an organic electroluminescent device according to the invention; BP The highest occupied molecular orbital HOMO(H BP ) of energy E HOMO (H BP ), preferably lower than the energy E HOMO (H N ) with the highest occupied molecular orbital HOMO(H N ).

[0211] In a preferred embodiment of the present invention, the n-host H N is the light-emitting layer E B As long as it exists in the following formulas (34) to (36): E HOMO (E B )-E HOMO (H N )≧0.3eV (34) E LUMO (E B )-E LUMO (H N )≧0.2eV (35) E LUMO (S B )-E LUMO (H N )≧0.2eV (36) Preferably, one or more or all of the relationships expressed by

[0212] In a preferred embodiment of the present invention, the n-host H N and bipolar host H BP is the light-emitting layer E B As long as it exists in the following formulas (34) to (37): E HOMO (E B )-E HOMO (H N )≧0.3eV (34) E LUMO (E B )-E LUMO (H N )≧0.2eV (35) E LUMO (S B )-E LUMO (H N )≧0.2eV (36) E HOMO (H BP )-E HOMO (H N )≧0.3eV (37) One or more or all of the relationships represented by

[0213] Therefore, in a preferred embodiment of the present invention, the TADF material E contained in at least one emissive layer B of the organic electroluminescent device according to the present invention B is the energy E HOMO (E B ) with the highest occupied molecular orbital HOMO (E B ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention, N is the energy E HOMO (H N ) with the highest occupied molecular orbital HOMO(H N ), wherein preferably: E HOMO (E B )-E HOMO (H N ) ≧0.3 eV. In other words, E HOMO (E B ) and E HOMO (H N ) is preferably 0.3 eV or more.

[0214] In a preferred embodiment of the present invention, the TADF material E B is the energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E B ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention, N is the energy E LUMO (H N ) with the lowest unoccupied molecular orbital LUMO(H N ), wherein preferably: E LUMO (E B )-E LUMO (H N ) ≧0.2 eV. In other words, E LUMO (E B ) and E LUMO (H N ) is preferably 0.2 eV or more.

[0215] In a preferred embodiment of the present invention, small FWHM emitters S are included in at least one emitting layer B of an organic electroluminescent device according to the present invention. B is the energy E LUMO (S B ) with the lowest unoccupied molecular orbital LUMO(S B ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention, N is the energy E LUMO (H N ) with the lowest unoccupied molecular orbital LUMO(H N ), wherein preferably: E LUMO (S B )-E LUMO (H N ) ≧0.2 eV. In other words, E LUMO (S B ) and E LUMO (H N) is preferably 0.2 eV or more.

[0216] In a preferred embodiment of the present invention, a bipolar host H optionally contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention BP is the energy E HOMO (H BP ) with the highest occupied molecular orbital HOMO(H BP ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention, N is the energy E HOMO (H N ) with the highest occupied molecular orbital HOMO(H N ), wherein preferably: E HOMO (H BP )-E HOMO (H N ) ≧0.3 eV. In other words, E HOMO (H BP ) and E HOMO (H N ) is preferably 0.3 eV or more.

[0217] In a preferred embodiment of the present invention, the bipolar host H BP is present in the light-emitting layer B, the following formulas (38) to (40): E HOMO (H BP )≦E HOMO (S B ) (38) E LUMO (H BP )≦E LUMO (E B ) (39) E LUMO (H BP ) <E LUMO (S B ) (40) Preferably, one, two or all of the relationships represented by

[0218] Thus, the bipolar host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention BP represents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The highest occupied molecular orbital HOMO(S B ) of energy E HOMO (S B ), preferably lower than or equal to the energy E HOMO (H BP ) with the highest occupied molecular orbital HOMO(H BP ).

[0219] Furthermore, the bipolar host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention BP represents a TADF material E contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention; B The lowest unoccupied molecular orbital LUMO (E B ) of energy E LUMO (E B ), preferably lower than or equal to the energy E LUMO (H BP ) with the lowest unoccupied molecular orbital LUMO(H BP ).

[0220] In addition, the bipolar host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention BP represents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The lowest unoccupied molecular orbital LUMO(S B ) of energy E LUMO (S B ), preferably lower than the energy E LUMO (H BP ) with the lowest unoccupied molecular orbital LUMO(H BP ).

[0221] In a preferred embodiment of the present invention, the bipolar host H BP is present in the light-emitting layer B, the following formulas (41) to (43): -0.3 eV ≤ E HOMO (H BP )-E HOMO (E B )≦0.3 eV (41) E LUMO (E B )-E LUMO (H BP ) ≧ 0.2 eV (42) E LUMO (H BP )-E LUMO (S B ) ≧ 0.2 eV (43) Preferably, one, two or all of the relationships represented by

[0222] Thus, in a preferred embodiment of the present invention, a bipolar host H optionally contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention BP is the energy E HOMO (H BP ) with the highest occupied molecular orbital HOMO(H BP ) and the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention. B is the energy E HOMO (E B ) with the highest occupied molecular orbital HOMO (E B ), where preferably: -0.3 eV≦E HOMO (H BP )-E HOMO (E B )≦0.3 eV. In other words, the bipolar host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention BP HOMO(H BP ) is a TADF emitter E contained in at least one emitting layer B of an organic electroluminescent device according to the present invention B HOMO(E B), but the energy difference preferably does not exceed 0.3 eV.

[0223] Furthermore, the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention B is the energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E B ) optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention is a bipolar host H BP is the energy E LUMO (H BP ) with the lowest unoccupied molecular orbital LUMO(H BP ), wherein preferably: E LUMO (E B )-E LUMO (H BP ) ≧0.2 eV. In other words, E LUMO (E B ) and E LUMO (H BP ) is preferably 0.2 eV or more.

[0224] In addition, the bipolar host H optionally contained in at least one light-emitting layer B of the organic electroluminescent device according to the invention BP is the energy E LUMO (H BP ) with the lowest unoccupied molecular orbital LUMO(H BP ) and the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention. B is the energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E B ), wherein preferably: E LUMO (H BP )-E LUMO (S B ) ≧0.2 eV. In other words, E LUMO (H BP ) and E LUMO (EB ) is preferably 0.2 eV or more.

[0225] In a preferred embodiment of the present invention, the compounds of formulas (44) and (45) below are provided: E HOMO (E B )≦E HOMO (S B ) (44) E LUMO (E B ) <E LUMO (S B ) (45) The relationship represented by

[0226] Therefore, in a preferred embodiment, the TADF material E contained in at least one emitting layer B of the organic electroluminescent device according to the present invention B represents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The highest occupied molecular orbital HOMO(S B ) of energy E HOMO (S B ) preferably equal to or lower than the energy E HOMO (E B ) with the highest occupied molecular orbital HOMO (E B ).

[0227] In a preferred embodiment of the present invention, the TADF material E B represents a small FWHM emitter S contained in at least one emitting layer B of an organic electroluminescent device according to the present invention. B The lowest unoccupied molecular orbital LUMO(S B ) of energy E LUMO (E B ) lower than the energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E B ).

[0228] In a preferred embodiment of the present invention, the compound according to formula (46): E LUMO (E B )-E LUMO (S B )≧0.2eV (46) The relationship represented by

[0229] Therefore, in a preferred embodiment of the present invention, the TADF material E contained in at least one emissive layer B of the organic electroluminescent device according to the present invention B is the energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E B ) and a small FWHM emitter S contained in at least one emitting layer B of the organic electroluminescent device according to the present invention. B is the energy E LUMO (S B ) with the lowest unoccupied molecular orbital LUMO(S B ), wherein preferably: E LUMO (E B )-E LUMO (S B ) ≧0.2 eV. In other words, E LUMO (E B ) and E LUMO (S B ) is preferably 0.2 eV or more.

[0230] In even more preferred embodiments of the present invention, two, three, more than three or all of the relationships represented by the above-described formulae (1) to (23), (29) to (33), (38) to (40), (44) and (45) apply, where this does not imply that all species referred to in these relationships are preferably contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention, but instead that it is particularly preferred that all relationships selected from the group of listed relationships referring to any contained species apply. For example, n-host H Nis not contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention, the n-host H N While the relations referring to the n-host H N is preferably applicable whenever

[0231] In particularly preferred embodiments of the present invention, two, three, more than three or all of the relationships represented by the above-described formulae (1) to (46) apply, where this does not imply that all species referring to these relationships are preferably contained in at least one light-emitting layer B of an organic electroluminescent device according to the present invention, but instead it implies that it is particularly preferred that all relationships selected from the group of relationships referring to any contained species apply.

[0232] Composition of at least one light-emitting layer B One or more hosts H B (e.g., one or more p-hosts H P and / or one or more n-hosts H N and / or one or more bipolar hosts H BP ), one or more TADF emitters E B , and one or more light emitters S B may be included in the organic electroluminescent device in any amount and in any ratio.

[0233] In a preferred embodiment of the present invention, each of the at least one light-emitting layer B in the organic electroluminescent device according to the present invention contains at least one host material H B (More specifically: P and / or H N and / or H BP ) with at least one TADF material E B Contains more by weight than

[0234] In a preferred embodiment of the present invention, each of the at least one emitting layer B in the organic electroluminescent device according to the present invention contains at least one TADF material E B , at least one small FWHM emitter S B Contains more by weight than

[0235] In a preferred embodiment, in the organic electroluminescent device according to the present invention, at least one of the light-emitting layers B comprises (i) 30 to 89.9% by weight of one or more host compounds H B ; (ii) 10 to 60 wt. % of one or more TADF materials E B ; and (iii) 0.1 to 10 wt. % of one or more small FWHM phosphors S B and, where appropriate, (iv) 0 to 72% by weight of one or more solvents Contains (or consists of).

[0236] In the organic electroluminescent device according to the present invention, H N In an optional preferred embodiment, any of at least one light-emitting layer B is (i) 10 to 89.9% by weight of one or more p-host compounds H P ; (ii) 0 to 79.9% by weight of one or more n-host compounds H N ; (iii) 10 to 50 wt % of one or more TADF materials E B ; and (iv) 0.1 to 10 wt. % of one or more small FWHM phosphors S B and, where appropriate, (v) 0 to 72% by weight of one or more solvents Contains (or consists of).

[0237] In the organic electroluminescent device according to the present invention, HN In an even more preferred embodiment, at least one of the light-emitting layers B is (i) 22 to 87.5% by weight of one or more p-host compounds H P ;In some cases, (ii) 0 to 65.5% by weight of one or more n-host compounds H N ; (iii) 12 to 40 wt. % of one or more TADF materials E B ; and (iv) 0.5 to 5 wt. % of one or more small FWHM phosphors S B and, where appropriate, (v) 0 to 65.5% by weight of one or more solvents Contains (or consists of).

[0238] In the organic electroluminescent device according to the present invention, H N In another preferred embodiment, the light-emitting layer B is (i) 10 to 30% by weight of one or more p-host compounds H P ; (ii) 40 to 79.9% by weight of one or more n-host compounds H N ; (iii) 10 to 49 wt. % of one or more TADF materials E B ; and (iv) 0.1 to 10 wt. % of one or more small FWHM phosphors S B and, where appropriate, (v) 0 to 34% by weight of one or more solvents Contains (or consists of).

[0239] In the organic electroluminescent device according to the present invention, H N In another preferred embodiment, the light-emitting layer B is (i) 40 to 74% by weight of one or more p-host compounds H P ; (ii) 10 to 30% by weight of one or more n-host compounds H N ; (iii) 10 to 49 wt. % of one or more TADF materials E B ; and (iv) 0.1 to 10 wt. % of one or more small FWHM phosphors S B and, where appropriate, (v) 0 to 34% by weight of one or more solvents Contains (or consists of).

[0240] As mentioned above, it is understood that the different light-emitting layers B optionally contained in the same organic electroluminescent device according to the present invention do not necessarily all comprise the same materials, or even the same materials in the same ratios.

[0241] In one embodiment, the emissive layer not only comprises organic molecules according to the present invention, but also a host material, in particular at least one TADF material E, whose triplet (T1) and singlet (S1) energy levels are energetically higher than the triplet (T1) and singlet (S1) energy levels of the one or more organic molecules. B and / or at least one emitter S of FWHM B Includes.

[0242] A further aspect of the present invention is (a) at least one emitter S according to the invention of FWHM, in particular in the form of an emitter and / or a host; B , and (b) A TADF material E different from the organic molecules according to the present invention B one or more emitters and / or host materials H B , (c) optionally one or more dyes and / or one or more solvents The present invention relates to a composition comprising or consisting of:

[0243] In one embodiment, the light emitting layer comprises: (a) at least one FWHM emitter S according to the invention, in particular in the form of an emitter and / or a host; B , and (b) A TADF material E different from the organic molecules according to the present invention B one or more emitters and / or host materials H B , and (c) optionally one or more dyes and / or one or more solvents A composition comprising or consisting of (or consisting essentially of)

[0244] In one embodiment, the emissive layer EML is (i) 0.1 to 10% by weight, preferably 0.5 to 5% by weight, in particular 1 to 3% by weight, of one or more phosphors S according to the invention having a FWHM of B ; (ii) 5 to 99% by weight, preferably 15 to 85% by weight, in particular 20 to 75% by weight, of at least one host compound H B ; and (iii) 0.9 to 94.9% by weight, preferably 14.5 to 80% by weight, in particular 24 to 77% by weight, of at least one further host compound D having a structure different from that of the molecule according to the invention; and (iv) optionally 0 to 94% by weight, preferably 0 to 65% by weight, in particular 0 to 50% by weight, of a solvent; and (v) up to 30% by weight, in particular up to 20% by weight, preferably up to 5% by weight of (TADF material E) having a structure different from that of the molecules according to the invention. B At least one further emitter molecule F A composition comprising or consisting of (or consisting essentially of)

[0245] Preferably, the energy is provided by a host compound H B to one or more FWHM emitters S B In particular, the present invention B Host compound H BThe first triplet excited state T1(H B ) to the first triplet excited state T1(S B ) and / or the present invention S B Host compound H B The first singlet excited state S1(H B ) to a first singlet excited state S1(S B ) can be moved to

[0246] Element structure Those skilled in the art will recognize that at least one light-emitting layer B is typically incorporated into the organic electroluminescent device of the present invention. Preferably, such an organic electroluminescent device comprises at least the following layers: at least one light-emitting layer B, at least one anode layer A and at least one cathode layer C.

[0247] Preferably, at least one light-emitting layer B is located between an anode layer A and a cathode layer C. The general set-up is therefore preferably ABC. This does not of course exclude the presence of one or more optional further layers. These can be present on the A side, the B side and / or the C side, respectively.

[0248] Preferably, the anode layer A is located on the surface of the substrate. The substrate can be formed by any material or composition of materials. Most frequently, a glass slide is used as the substrate. Alternatively, a thin metal layer (e.g., a copper, gold, silver or aluminum film) or a plastic film or slide can be used. This can allow a higher degree of flexibility. At least one of both electrodes should be (essentially) transparent to allow light emission from the electroluminescent element (e.g., an OLED). Usually, the anode layer A is mostly made of a material that allows to obtain an (essentially) transparent film. Preferably, the anode layer A comprises or even consists of a high content of transparent conductive oxides (TCOs).

[0249] Such an anode layer A may illustratively comprise indium tin oxide, zinc aluminum oxide, phosphorus tin oxide, indium zinc oxide, PbO, SnO, zirconium oxide, molybdenum oxide, vanadium oxide, tungsten oxide, graphite, doped Si, doped Ge, doped GaA, doped polyaniline, doped polypyrrole and / or doped polythiophene, as well as mixtures of two or more thereof.

[0250] Particularly preferably, the anode layer A is made of indium tin oxide (ITO) (e.g., (InO 3 ) 0.9 (SnO 2 ) 0.1 The roughness of the anode layer A caused by the transparent conductive oxide (TCO) can be compensated for by using a hole injection layer (HIL). Furthermore, the HIL can facilitate the injection of quasi-charge carriers (i.e. holes), in that the transfer of quasi-charge carriers from the TCO to the hole transport layer (HTL) is facilitated. The hole injection layer (HIL) can be made of poly-3,4-ethylenedioxythiophene (PEDOT), polystyrenesulfonate (PSS), MoO 2 , V 2 O 5, CuPC or CuI, in particular a mixture of PEDOT and PSS. The hole injection layer (HIL) can also prevent diffusion of metals from the anode layer A into the hole transport layer (HTL). The HIL can be, for example, PEDOT:PSS (poly-3,4-ethylenedioxythiophene:polystyrenesulfonate), PEDOT (poly-3,4-ethylenedioxythiophene), mMTDATA (4,4',4''-tris[phenyl(m-tolyl)amino]triphenylamine), spiro-TAD (2,2',7,7'-tetrakis(n,n-diphenylamino)-9,9'-spirobifluorene), DNTPD (N1,N1'-(biphenyl-4,4'-diyl)bis(N1-phenyl-N4,N4-di-m-tolylbenzene-1,4-diamine), NPB (N,N'-bis- (1-naphthalenyl)-N,N'-bis-phenyl-(1,1'-biphenyl)-4,4'-diamine), NPNPB (N,N'-diphenyl-N,N'-di-[4-(N,N-diphenyl-amino)phenyl]benzidine), MeO-TPD (N,N,N',N'-tetrakis(4-methoxyphenyl)-benzidine), HAT-CN (1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile) and / or spiro-NPD (N,N'-diphenyl-N,N'-bis-(1-naphthyl)-9,9'-spirobifluorene-2,7-diamine).

[0251] Adjacent to the anode layer A or the hole injection layer (HIL) is typically a hole transport layer (HTL). Any hole transport compound may be used herein. Exemplarily, electron rich aromatic heterocyclic compounds such as triarylamines and / or carbazoles may be used as hole transport compounds. The HTL can reduce the energy barrier between the anode layer A and the light emitting layer B (which serves as the light emitting layer (EML)). The hole transport layer (HTL) may also be an electron blocking layer (EBL). Preferably, the hole transport compounds have a relatively high energy level of their triplet state T1. Exemplarily, the hole transport layer (HTL) may comprise a star-shaped heterocycle such as tris(4-carbazolyl-9-ylphenyl)amine (TCTA), poly-TPD (poly(4-butylphenyl-diphenyl-amine)), [alpha]-NPD (poly(4-butylphenyl-diphenyl-amine)), TAPC (4,4'-cyclohexylidene-bis[N,N-bis(4-methylphenyl)benzenamine]), 2-TNATA (4,4',4''-tris[2-naphthyl(phenyl)-amino]triphenylamine), spiro-TAD, DNTPD, NPB, NPNPB, MeO-TPD, HAT-CN, and / or TrisPcz (9,9'-diphenyl-6-(9-phenyl-9H-carbazol-3-yl)-9H,9'H-3,3'-bicarbazole). In addition, the HTL may include a p-doped layer, which may consist of an inorganic or organic dopant in an organic hole-transporting matrix. Transition metal oxides such as vanadium oxide, molybdenum oxide or tungsten oxide may be used as inorganic dopants, for example. Tetrafluorotetracyanoquinodimethane (F4-TCNQ), copper-pentafluorobenzoate (Cu(I)pFBz) or transition metal complexes may be used as organic dopants, for example.

[0252] Exemplary EBLs include mCP (1,3-bis(carbazol-9-yl)benzene), TCTA, 2-TNATA, mCBP (3,3-di(9H-carbazol-9-yl)biphenyl), 9-[3-(dibenzofuran-2-yl)phenyl]-9H-carbazole, 9-[3-(dibenzofuran-2-yl)phenyl]-9H-carbazole, 9-[3-(dibenzothiophen-2-yl)phenyl]-9H-carbazole, and 9-[3-(dibenzothiophen-2-yl)phenyl]-9H-carbazole. The carbazole may include carbazole, 9-[3,5-bis(2-dibenzofuranyl)phenyl]-9H-carbazole, 9-[3,5-bis(2-dibenzothiophenyl)phenyl]-9H-carbazole, tris-Pcz, CzSi (9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole) and / or DCB (N,N'-dicarbazolyl-1,4-dimethylbenzene).

[0253] The composition of at least one light-emitting layer B has been described above. Any of the one or more light-emitting layers B according to the present invention preferably has a thickness of 1 mm or less, more preferably 0.1 mm or less, even more preferably 10 μm or less, even more preferably 1 μm or less, particularly preferably 0.1 μm or less.

[0254] Any electron transporter may be used in the electron transport layer (ETL). Illustratively, electron poor compounds such as benzimidazole, pyridine, triazole, oxadiazole (e.g. 1,3,4-oxadiazole), phosphine oxide and sulfone may be used. Illustratively, the electron transporter ETM may also be a star-shaped heterocycle such as 1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl (TPBi). The ETM may be illustratively NBphen (2,9-bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline), Alq3 (aluminum-tris(8-hydroxyquinoline)), TSPO1 (diphenyl-4-triphenylsilylphenyl-phosphine oxide), BPyTP2 (2,7-di(2,2′-bipyridin-5-yl)triphenyl), Sif87 (dibenzo[b,d]thiophen-2-yltriphenylsilane), Sif88 (dibenzo[b,d]thiophen-2-yl)diphenylsilane), BmPyPhB (1,3-bis[3,5-di(pyridin-3-yl)phenyl]benzene) and / or BTB (4,4′-bis-[2-(4,6-diphenyl-1,3,5-triazinyl)]-1,1′-biphenyl). Optionally, the electron transport layer may be doped with a material such as Liq (8-hydroxyquinolinolatolithium). Optionally, a second electron transport layer may be located between the electron transport layer and the cathode layer C. The electron transport layer (ETL) may also block holes or a hole blocking layer (HBL) is introduced.

[0255] HBL is, for example, HBM1: [ka] , BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline = bathocuproine), BAlq (bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum), NBphen (2,9-bis(naphthalen-2-yl)-4,7-diphenyl-1,10-phenanthroline), Alq3 (aluminum-tris(8-hydroxyquinoline)), TSPO1 (diphenyl-4-triphenylsilylphenyl-phosphine oxide), T2T (2,4,6-tris(biphenyl-3-yl)-1,3,5-triazine), T These may include 3T (2,4,6-tris(triphenyl-3-yl)-1,3,5-triazine), TST (2,4,6-tris(9,9'-spirobifluoren-2-yl)-1,3,5-triazine), DTST (2,4-diphenyl-6-(3'-triphenylsilylphenyl)-1,3,5-triazine), DTDBF (2,8-bis(4,6-diphenyl-1,3,5-triazinyl)dibenzofuran) and / or TCB / TCP (1,3,5-tris(N-carbazolyl)benzol / 1,3,5-tris(carbazol-9-yl)benzene).

[0256] Adjacent to the electron transport layer (ETL) may be a cathode layer C. Exemplarily, the cathode layer C may comprise or consist of a metal (e.g., Al, Au, Ag, Pt, Cu, Zn, Ni, Fe, Pb, LiF, Ca, Ba, Mg, In, W or Pd) or a metal alloy. For practical reasons, the cathode layer C may also consist of an (essentially) opaque metal such as Mg, Ca or Al. Alternatively or in addition, the cathode layer C may also comprise graphite and / or carbon nanotubes (CNTs). Alternatively, the cathode layer C may also consist of nanoscale silver wires.

[0257] In a preferred embodiment, the organic electroluminescent device comprises at least the following layers: A) an anode layer A, which contains at least one component selected from the group consisting of indium tin oxide, indium zinc oxide, PbO, SnO, graphite, doped silicium, doped germanium, doped GaA, doped polyaniline, doped polypyrrole, doped polythiophene, and mixtures of two or more thereof; B) a light-emitting layer B according to the invention as described herein; and C) a cathode layer C, which contains at least one component selected from the group consisting of Al, Au, Ag, Pt, Cu, Zn, Ni, Fe, Pb, In, W, Pd, LiF, Ca, Ba, Mg, and mixtures or alloys of two or more thereof; Including, Here, the light-emitting layer B is located between the anode layer A and the cathode layer C.

[0258] In one embodiment, when the organic electroluminescent device is an OLED, it optionally has the following layer structure: A) anode layer A, which illustratively comprises indium tin oxide (ITO); HTL) Hole transport layer HTL; B) Light-emitting layer B, according to the present invention as described herein; ETL) electron transport layer ETL; and C) a cathode layer, illustratively containing Al, Ca and / or Mg may include: Preferably, the layer order here is A-HTL-B-ETL-C.

[0259] Additionally, the organic electroluminescent device may optionally include one or more protective layers that protect the device from damaging exposure to harmful species in the environment, illustratively including moisture, vapors and / or gases.

[0260] An electroluminescent device (e.g., an OLED) may further include an optional protective layer between the electron transport layer (ETL) D and the cathode layer C, which may be referred to as the electron injection layer (EIL). This layer may be made of any of a variety of materials, including lithium fluoride, cesium fluoride, silver, Liq (8-hydroxyquinolinolatolithium), Li 2 O, BaF 2 , MgO and / or NaF.

[0261] Unless otherwise specified, any of the layers of the various embodiments may be deposited by any suitable method. The layers in the context of the present invention, including the light-emitting layer B, may be produced by means of liquid processing (also called "film processing", "fluid processing", "solution processing" or "solvent processing"). This means that the components contained in each layer are applied in liquid form to the surface of a part of the device. Preferably, the layers in the context of the present invention, including the light-emitting layer B, may be produced by means of spin-coating. This method, which is well known to those skilled in the art, makes it possible to obtain thin and (essentially) homogeneous layers.

[0262] Alternatively, layers in the context of the present invention, including at least one light-emitting layer B, may be produced by other methods based on liquid processing, such as, for example, casting methods (e.g., drop casting) and rolling methods, as well as printing methods (e.g., inkjet printing, gravure printing, blade coating), which may optionally be carried out in an inert atmosphere (e.g., in a nitrogen atmosphere).

[0263] In another preferred embodiment, the layers in the context of the present invention, including at least one emissive layer B, may be produced by any other method known in the art, including but not limited to vacuum processing methods well known to those skilled in the art, such as deposition by thermal (co)distillation, organic vapor phase deposition (OVPD) and organic vapor jet printing (OVJP).

[0264] When producing a layer by means of liquid processing, a solution containing the components of the layer (i.e. for the light-emitting layer B of the present invention, at least one host compound H B , at least one TADF material E B and at least one small FWHM emitter S B ) may further comprise a volatile organic solvent. Such an organic solvent may optionally be one selected from the group consisting of tetrahydrofuran, dioxane, chlorobenzene, diethylene glycol diethyl ether, 2-(2-ethoxyethoxy)ethanol, gamma-butyrolactone, N-methylpyrrolidinone, ethoxyethanol, xylene, toluene, anisole, phenetole, acetonitrile, tetrahydrothiophene, benzonitrile, pyridine, trihydrofuran, triarylamine, cyclohexanone, acetone, propylene carbonate, ethyl acetate, benzene, and PGMEA (propylene glycol monoethyl ether acetate). Furthermore, a combination of two or more solvents may be used. After being applied in liquid form, the layer may be subsequently dried and / or cured by any means in the art, illustratively at ambient conditions, at elevated temperatures (e.g., about 50° C. or about 60° C.), or under reduced pressure.

[0265] The organic electroluminescent element may also be formed into a thin layer, generally having a thickness of 5 mm or less, 2 mm or less, 1 mm or less, 0.5 mm or less, 0.25 mm or less, 100 μm or less, or 10 μm or less.

[0266] Organic electroluminescent devices (e.g., OLEDs) are small in size (e.g., 5 mm 2 Below, and even 1mm 2 with a surface area of ​​less than 0.5 cm 2 ) or large size (e.g. 20cm 2The organic electroluminescent device (e.g., OLED) according to the present invention can be used to generate screens, as large-area light-emitting devices, as luminescent wallpapers, as luminescent window frames or glass, as luminescent signs, as luminescent displays or flexible screens or displays, in some cases. Next to normal use, the organic electroluminescent device (e.g., OLED) can also be illustratively used as luminescent membranes, "smart packaging" signs or innovative design elements. Furthermore, they can be used for cell detection and testing (e.g., as biological signs).

[0267] Further definitions and information As used throughout, the term "layer" in the context of the present invention preferably refers to a body having a broadly planar geometry.

[0268] As used herein, the terms organic electroluminescent and optoelectronic light-emitting devices can be understood in the broadest sense as any device comprising one or more light-emitting layers B, each of which is formed from at least one host material H. B , at least one TADF material E B , and at least one small FWHM emitter S B for all of which the above definitions apply.

[0269] An organic electroluminescent device can be understood in the broadest sense as any device based on organic materials suitable for emitting light in the visible or ultraviolet (UV) range, i.e., in the wavelength range from 380 nm to 800 nm. More preferably, the organic electroluminescent device may be capable of emitting light in the visible range, i.e., from 400 nm to 800 nm.

[0270] In a preferred embodiment of the invention, the organic electroluminescent device is a device selected from the group consisting of an organic light emitting diode (OLED), a light emitting electrochemical cell (LEC) and a light emitting transistor.

[0271] Particularly preferably, the organic electroluminescent element is an organic light emitting diode (OLED). Optionally, the organic electroluminescent element may be entirely opaque, semi-transparent or (essentially) transparent.

[0272] As used throughout this application, the term "aromatic ring system" can be understood in the broadest sense as any bicyclic or polycyclic aromatic moiety, for which the following definition applies.

[0273] As used throughout this application, the terms "aryl" and "aromatic" can be understood in the broadest sense as any monocyclic, bicyclic or polycyclic aromatic moiety. Thus, an aryl group contains 6 to 60 aromatic ring atoms, and a heteroaryl group contains 5 to 60 aromatic ring atoms, of which at least one is a heteroatom. Nevertheless, throughout this application, the number of aromatic ring atoms is given as a subscript number in the definition of certain substituents. In particular, a heteroaromatic ring contains 1 to 3 heteroatoms. Again, the terms "heteroaryl" and "heteroaromatic" can be understood in the broadest sense as any monocyclic, bicyclic or polycyclic hetero-aromatic moiety containing at least one heteroatom. The heteroatom may be the same or different in each occurrence and is individually selected from the group consisting of N, O and S. Thus, the term "arylene" refers to a divalent substituent that has two attachment sites to other molecular structures, thereby serving as a linker structure. If a group in an illustrative embodiment is defined differently from the definitions given herein, e.g., the number of aromatic ring atoms or the number of heteroatoms is different from the definitions given, the definition in the illustrative embodiment shall apply. According to the present invention, a fused (annulated) aromatic or heteroaromatic polycycle is composed of two or more single aromatic or heteroaromatic rings that have been formed into a polycycle via a condensation reaction.

[0274] In particular, as used throughout this application, the terms "aryl group" or "heteroaryl group" refer to any of the following: benzene, naphthalene, anthracene, phenanthrene, pyrene, dihydropyrene, chrysene, perylene, fluoranthene, benzanthracene, benzphenanthrene, tetracene, pentacene, benzopyrene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene; pyrrole, indole, isoindole, carbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, phenothiazine, phenoxazine, pyrazole, indazole, imidazole, benzimidazole, naphthoimidazole, phenanthridine, pyridoimidazole, ... and groups attached through any position of the aromatic or heteroaromatic group derived from radinoimidazole, quinoxalinoimidazole, oxazole, benzoxazole, naphthoxazole, anthroxazole, phenanthroxazole, isoxazole, 1,2-thiazole, 1,3-thiazole, benzothiazole, pyridazine, benzopyridazine, pyrimidine, benzopyrimidine, 1,3,5-triazine, quinoxaline, pyrazine, phenazine, naphthyridine, carboline, benzocarboline, phenanthroline, 1,2,3-triazole, 1,2,4-triazole, benzotriazole, 1,2,3-oxadiazole, 1,2,4-oxadiazole, 1,2,5-oxadiazole, 1,2,3,4-tetrazine, purine, pteridine, indolizine and benzothiadiazole, or a combination of the groups described above.

[0275] As used throughout this application, the term "cyclic group" can be understood in the broadest sense as any monocyclic, bicyclic or polycyclic moiety.

[0276] As used above and herein, the term "alkyl group" can be understood in the broadest sense as any linear, branched or cyclic alkyl substituent. In particular, the term alkyl refers to the following substituents: methyl (Me), ethyl (Et), n-propyl (nPr), i-propyl (iPr), cyclopropyl, n-butyl (nBu), i-butyl (iBu), s-butyl (sBu), t-butyl (tBu), cyclobutyl, 2-methylbutyl, n-pentyl, s-pentyl, t-pentyl, 2-pentyl, neo-pentyl, cyclopentyl, n-hexyl, s-hexyl, t-hexyl, 2-hexyl, 3-hexyl, neo-hexyl, cyclopentyl, cyclopentyl, n-hexyl, s-hexyl, t-hexyl, 2-hexyl, 3-hexyl, neo-hexyl, cyclopentyl, cyclopentyl, n-hexyl, s-hexyl, t-hexyl, cyclo ... cyclohexyl, 1-methylcyclopentyl, 2-methylpentyl, n-heptyl, 2-heptyl, 3-heptyl, 4-heptyl, cycloheptyl, 1-methylcyclohexyl, n-octyl, 2-ethylhexyl, cyclooctyl, 1-bicyclo[2,2,2]octyl, 2-bicyclo[2,2,2]-octyl, 2-(2,6-dimethyl)octyl, 3-(3,7-dimethyl)octyl, adamantyl, 2,2,2-trifluoroethyl, 1,1-dimethyl-n-hex-1-yl 1,1-dimethyl-n-hept-1-yl, 1,1-dimethyl-n-oct-1-yl, 1,1-dimethyl-n-dec-1-yl, 1,1-dimethyl-n-dodec-1-yl, 1,1-dimethyl-n-tetradec-1-yl, 1,1-dimethyl-n-hexadec-1-yl, 1,1-dimethyl-n-octadec-1-yl, 1,1-diethyl-n-hex-1-yl, 1,1-diethyl-n-hept-1-yl, 1,1-diethyl-n-oct-1-yl, 1,1-diethyl 1,1-diethyl-n-dec-1-yl, 1,1-diethyl-n-dodec-1-yl, 1,1-diethyl-n-tetradec-1-yl, 1,1-diethyl-n-hexadec-1-yl, 1,1-diethyl-n-octadec-1-yl, 1-(n-propyl)-cyclohex-1-yl, 1-(n-butyl)-cyclohex-1-yl, 1-(n-hexyl)-cyclohex-1-yl, 1-(n-octyl)-cyclohex-1-yl and 1-(n-decyl)-cyclohex-1-yl.

[0277] As used above and herein, the term "alkenyl" includes linear, branched and cyclic alkenyl substituents. The term alkenyl group includes, by way of example, the substituents ethenyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl or cyclooctadienyl.

[0278] As used above and herein, the term "alkynyl" includes linear, branched and cyclic alkynyl substituents. The term alkynyl group includes, by way of example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl or octynyl.

[0279] As used above and herein, the term "alkoxy" includes linear, branched and cyclic alkoxy substituents. The term alkoxy group includes, by way of example, methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy and 2-methylbutoxy.

[0280] As used above and herein, the term "thioalkoxy" includes linear, branched and cyclic thioalkoxy substituents, where, by way of example, the O of the alkoxy group is replaced by an S.

[0281] As used above and herein, the terms "halogen" and "halo" may be understood in the broadest sense as preferably fluorine, chlorine, bromine or iodine.

[0282] Wherever hydrogen (H) is mentioned herein, it can also be replaced by deuterium at each occurrence.

[0283] When a molecular fragment is described as being a substituent or otherwise attached to another moiety, it is understood that the name can be written as if it were the fragment (e.g., naphthyl, dibenzofuryl) or as if it were the entire molecule (e.g., naphthalene, dibenzofuran). As used herein, these different ways of designating a substituent or attached fragment are considered equivalent.

[0284] Unless otherwise specified, percentages refer to percentages by weight ((weight / weight), (w / w), wt.%).

[0285] Host compound H B (More specific:H P and H N ), the energy of the first triplet excited state T1 is typically taken as the energy of the host material H B The time-gated emission spectra are determined from the onset at 77 K with a delay time of 1 ms and an integration time of 1 ms measured in a neat film.

[0286] TADF material E B For, the energy of the first triplet excited state T1 is typically determined from the onset of the time-gated emission spectrum at 77 K with a delay time of 1 ms and an integration time of 1 ms measured in a film of poly(methyl methacrylate) (PMMA) with 10 wt % of the emitter unless otherwise stated.

[0287] Small full width at half maximum (FWHM) emitter S B For, the energy of the first triplet excited state T1 is typically determined from the onset of the time-gated emission spectrum at 77 K with a delay time of 1 ms and an integration time of 1 ms measured on a film of poly(methyl methacrylate) (PMMA) with 1 wt % to 5 wt %, in particular 1 wt %, of the emitter unless otherwise specified.

[0288] The orbitals and excited state energies can be determined by means of experimental methods known to those skilled in the art. Experimentally, the highest occupied molecular orbital E HOMO The energy of the lowest unoccupied molecular orbital E is determined by methods known to those skilled in the art from cyclic voltammetry measurements with an accuracy of 0.1 eV. LUMO The energy of E HOMO +E gap where E gap is determined as follows:

[0289] Host compound H B (More specific:H P and H N ), the onset of emission of a neat film of the host material, corresponding to the energy of the first singlet excited state S1, is E, unless otherwise stated. gap Used as.

[0290] TADF material E B For the onset of emission of a film having 10 wt % TADF material in poly(methyl methacrylate) (PMMA), which corresponds to the energy of the first singlet excited state S1, unless otherwise stated, E gap Used as.

[0291] Small full width at half maximum (FWHM) emitter S B For a small full width at half maximum (FWHM) emitter S in poly(methyl methacrylate) (PMMA), which corresponds to the energy of the first singlet excited state S B The onset of emission for films having 1% to 5% by weight, especially 1% by weight, is, unless otherwise specified, E gap Used as.

[0292] As used herein, unless more specifically defined in a particular context, the designations for the color of emitted and / or absorbed light are as follows: Violet color: >380~420nm wavelength range; Indigo: wavelength range of >420~475nm; Sky blue color: >475~500nm wavelength range; Green: >500~560nm wavelength range; Yellow: >560~580nm wavelength range; Orange: >580~620nm wavelength range; Red: Wavelength range of >620~800nm.

[0293] Unless otherwise stated, small FWHM emitter S B With respect to these colors, the illuminant S B Emission maximum .LAMBDA. of poly(methyl methacrylate) (PMMA) films with 2 wt.% max PMMA TADF material E B For these colors, unless otherwise stated, the emission maximum λ of a poly(methyl methacrylate) (PMMA) film with 10% max PMMA Refers to... EXAMPLES

[0294] Cyclic Voltammetry 10 in dichloromethane or a suitable solvent and a suitable supporting electrolyte (e.g., 0.1 mol / l tetrabutylammonium hexafluorophosphate). -3 Cyclic voltammograms of solutions with concentrations of organic molecules in mol / l were measured. The measurements were performed at room temperature and under nitrogen atmosphere using a three-electrode assembly (working and counter electrodes: Pt wire, reference electrode: Pt wire) and FeCp 2 / FeCp 2 + The HOMO data was corrected using ferrocene as an internal standard for SCE.

[0295] Density functional theory calculations Molecular geometries were optimized using BP86 functions and the resolution of identity method (RI). Excitation energies were calculated using the (BP86) optimized structures using the Time-Dependent DFT (TD-DFT) method. Orbitals and excited state energies were calculated using B3LYP functions. Def2-SVP basis set and m4 grid were used for numerical integration. The Turbomole program package was used for all calculations.

[0296] optical physical measurements Sample preparation: spin coating Equipment: Spin 150, SPS euro. The sample concentration, dissolved in an appropriate solvent, was 10 mg / ml.

[0297] Program: 1) 3 sec at 400 U / min; 20 sec at 1000 U / min at 1000 U / s. 3) 10 sec at 4000 U / min at 1000 U / s. After coating, the membrane was run at 70° C. for 1 min.

[0298] Photoluminescence spectroscopy and TCSPC (Time-Correlated Single Photon Counting) Steady-state emission spectroscopy was recorded using a Horiba Scientific, Modell FluoroMax-4 equipped with a 150W Xenon-Arc lamp, excitation and emission monochromators and a Hamamatsu R928 photomultiplier, with time-correlated single-photon counting option. Emission and excitation spectra were corrected using standard correction fits.

[0299] Excited state lifetimes were determined using the same system using an FM-2013 instrument and the TCSPC method with a Horiba Yvon TCSPC hub. Excitation light source: NanoLED370 (wavelength: 371nm, pulse duration: 1.1ns) NanoLED290 (wavelength: 294nm, pulse duration: <1ns) SpectraLED310 (wavelength: 314nm) SpectraLED355 (wavelength: 355nm).

[0300] Data analysis (exponential fit) was performed using the DataStation software suite and DAS6 analysis software. The fit was determined using a chi-square test.

[0301] Photoluminescence quantum yield measurement For photoluminescence quantum yield (PLQY) measurements, an absolute PL quantum yield measurement C9920-03G system (Hamamatsu Photonics) was used. Quantum yields and CIE coordinates were determined using software U6039-05 version 3.6.0.

[0302] Emission maxima are given in nm, quantum yields Φ in %, and CIE coordinates as x,y values.

[0303] The following protocol was used to determine PLQY: 1) Quality assurance: Anthracene in ethanol (known concentration) was used as a reference 2) Excitation wavelength: The absorption maximum of the organic molecule was determined and this wavelength was used to excite the molecule. 3) Measurement Quantum yields were measured under nitrogen atmosphere on solution or film samples. The yields were calculated using the following equation:

number

[0304] Generation and characterization of organic electroluminescent devices Through vacuum deposition method, OLED devices containing organic molecules according to the present invention can be produced. If a layer contains more than one compound, the weight percentage of one or more compounds is indicated in %. The total weight percentage value amounts to 100%, therefore, if no value is indicated, the fraction of this compound is equal to the difference between the given value and 100%.

[0305] Non-fully optimized OLEDs were characterized using standard methods and measuring electroluminescence spectra, intensity-dependent external quantum efficiency (in %) calculated using light detected by a photodiode, and current. OLED device lifetime was extracted from the change in luminance during operation at constant current density. The LT50 value corresponds to the time at which the measured luminance decreased to 50% of the initial luminance, similarly LT80 corresponded to the time at which the measured luminance decreased to 80% of the initial luminance, LT97 corresponded to the time at which the measured luminance decreased to 97% of the initial luminance, etc.

[0306] Accelerated lifetime measurements were performed (e.g., by applying increasing current densities). As an example, 500 cd / m 2 The LT80 value was determined at:

number

[0307] The values ​​correspond to the average of several (typically 2 to 8) pixels and the standard deviation among these pixels is shown. The figure shows a data series for one OLED pixel.

[0308] Experimental Results Stack Material [ka]

[0309] Host material H B (Here, for example, p-host H P) [ka]

[0310] [Table 1]

[0311] TADF material E B [ka] [ka]

[0312] [Table 2]

[0313] Small FWHM emitter S B [ka] [ka]

[0314] [Table 3]

[0315] [Table 4]

[0316] To evaluate the results of the present invention, comparative experiments were performed in which only the composition of the light-emitting layer (6) was varied.

[0317] Result I: Host H B (p-host H P (exemplified as) and the fluctuation of the illuminant SB Composition of Light-Emitting Layer B (percentages refer to weight percent): [Table 5]

[0318] E B =E B -10 and H P = Element results for mCBP: [Table 6]

[0319] E B =E B -10 and H P =Element results for PYD2: [Table 7]

[0320] Result II: Host H B and TADF E B Fluctuations in Configuration of the emissive layer B (percentages refer to weight percent): [Table 8]

[0321] S B =S B -1 and H P = Element results for mCBP: [Table 9]

[0322] S B =S B -1 and H P =Element results for PYD2: [Table 10]

[0323] H P mCBP and E B AsE B For all electroluminescent devices using a combination of host, TADF emitter and FWHM emitter (H-type devices), including -10, the emitter S B For illuminant S-1, a relative lifetime increase of 374% (from 1.00 to 4.74) can be observed. B For -2, a relative lifetime increase of 188% (from 1.00 to 2.88) can be observed, whereas for the illuminant S B For -3 a relative lifetime increase of 193% (from 1.00 to 2.93) could be observed, while the efficiency (EQE) remained almost constant.

[0324] In addition, H P mCBP and E B AsE B For all H-type elements using -10, the illuminant S was significantly lower than the comparative T-type elements. B For illuminant S-1, a full width at half maximum (FWHM) reduction of 47% (from 76 nm to 36 nm) can be observed. B For illuminant S-2, a 47% FWHM reduction (from 76 nm to 36 nm) can be observed. B For H-3, a 47% FWHM reduction (from 76 nm to 40 nm) was observed. P As mCBP, E B AsE B -10, and S B As B -1, S B -2 or S B All H-type and T-type devices using -3 exhibited emission maxima in the desired green wavelength range of 500 nm to 560 nm, and even in the more preferred range of 510 nm to 550 nm.

[0325] H P As PYD2 and E B AsE BFor all H-type elements using -10, the illuminant S was significantly lower than the comparative T-type elements. B For illuminant S-1, a relative lifetime increase of 603% (from 1.00 to 7.03) can be observed. B For luminant S-2, a 303% increase in the relative lifetime (from 1.00 to 4.03) can be observed. B For H-3, a 58% increase in relative lifetime (from 1.00 to 1.58) could be observed, while the efficiency (EQE) remained almost constant. P As PYD2 and E B AsE B For all H-type elements using -10, the illuminant S was significantly lower than the comparative T-type elements. B For illuminant S-1, a full width at half maximum (FWHM) reduction of 46% (from 78 nm to 42 nm) can be observed. B For illuminant S-2, a 46% FWHM reduction (from 78 nm to 42 nm) can be observed. B For -3, a 46% FWHM reduction (from 78 nm to 42 nm) could be observed. P As PYD2, E B AsE B -10, and S B As B -1, S B -2 or S B All H-type and T-type devices using -3 exhibited emission maxima in the desired green wavelength range of 500 nm to 560 nm, and even in the more preferred range of 510 nm to 550 nm.

[0326] H P As mCBP and S B As B For all H-type elements using -1, when compared to their respective comparison T-type elements, B With the use of -1, a relative lifespan extension of 89% (from 1.00 to 1.89) was observed, with E B For -3, a 120% increase in relative life span (from 0.59 to 1.79) was observed, with E BFor -4, a 120% increase in relative life span (from 1.09 to 2.29) was observed, with E B For -8, a 700% relative lifespan extension (from 2.20 to 9.20) can be observed, and E B For H-8, an increase in the relative lifetime of 859% (from 2.29 to 10.88) could be observed, while the efficiency (EQE) remained almost constant. P As mCBP and S B As B For all H-type elements using -1, when compared to their respective comparison T-type elements, B For E-1, a 23% full width at half maximum (FWHM) decrease (from 86 nm to 68 nm) can be observed. B For -3, a 53% FWHM reduction (from 76 nm to 36 nm) can be observed, and E B For -4, a 50% FWHM reduction (from 80 nm to 40 nm) can be observed, and E B For -8, a 46% FWHM reduction (from 78 nm to 42 nm) can be observed, and E B For -10, a 53% FWHM reduction (from 76 nm to 36 nm) could be observed. P As mCBP, S B As B -1, and E B AsE B -1, E B -3, E B -4, E B -8 or E B All H-type and T-type devices using -10 exhibited emission maxima in the desired green wavelength range of 500 nm to 560 nm, and even in the more preferred range of 510 nm to 550 nm.

[0327] H P As PYD2 and S B As B For all H-type elements using -1, when compared to their respective comparison T-type elements, B With the use of -3, a relative lifespan extension of 399% (from 1.00 to 4.99) was observed, with EB For -4, a 590% increase in relative life span (from 1.86 to 7.76) was observed, and E B For -5, a 120% increase in relative life span (from 0.44 to 2.37) can be observed, with E B For E-6, a 136% increase in relative life span (from 1.08 to 2.44) was observed. B For -8, a 781% increase in relative life span (from 2.56 to 10.37) was observed, and E B For H-10, a 981% increase in relative lifetime (from 1.63 to 11.44) could be observed, while no significant change in efficiency (EQE) was observed. P As PYD2 and S B As B For all H-type elements using -1, when compared to their respective comparison T-type elements, B For -3, a 47% full width at half maximum (FWHM) reduction (from 76 nm to 40 nm) can be observed, and E B For -4, a 48% FWHM reduction (from 80 nm to 42 nm) can be observed, and E B For -5, a 46% FWHM reduction (from 78 nm to 42 nm) can be observed, and E B For -6, a 47% FWHM reduction (from 75 nm to 40 nm) can be observed, and E B For -8, a 45% FWHM reduction (from 76 nm to 42 nm) can be observed, and E B For -10, a 47% FWHM reduction (from 78 nm to 42 nm) could be observed. P As PYD2, S B As B -1, and E B AsE B -3, E B -4, E B -5, E B -5, E B -8 or E BAll H-type and T-type devices using -10 exhibited emission maxima in the desired green wavelength range of 500 nm to 560 nm, and even in the more preferred range of 510 nm to 550 nm.

[0328] Further examples of organic electroluminescent devices according to the present invention:

[0329] Example D1 Small FWHM emitter S B -1 was also tested in an OLED D1 fabricated with the following layer structure: [Table 11]

[0330] [ka]

[0331] The OLED D1 is 1000cd / m 2 An external quantum efficiency (EQE) of 16.1% was obtained at 1200 cd / m. The emission maximum was at 532 nm with a FWHM of 38 nm at 7.6 V. The corresponding CIEx value was 0.32 and CIEy value was 0.65. 2 The LT95 value of 1522h was determined.

[0332] Example D2 Small FWHM emitter S B -1 was also tested on an OLED D2 fabricated with the following layer structure: [Table 12]

[0333] OLED D2 is 1000cd / m 2 An external quantum efficiency (EQE) of 17.7% was obtained at 1200 cd / m. The emission maximum was at 532 nm with a FWHM of 36 nm at 7.6 V. The corresponding CIEx value was 0.31 and CIEy value was 0.65. 2 The LT95 value for 2006h was determined.

[0334] Example D3 Small FWHM emitter S B -1 was also tested in an OLED D3 fabricated with the following layer structure: [Table 13]

[0335] OLED D3 is 1000cd / m 2 An external quantum efficiency (EQE) of 20.2% was obtained at 1200 cd / m. The emission maximum was at 532 nm with a FWHM of 38 nm at 7.6 V. The corresponding CIEx value was 0.32 and CIEy value was 0.65. 2 The LT95 value of 1866h was determined.

[0336] Example D4 Small FWHM emitter S B -3 was also tested on an OLED D4 fabricated with the following layer structure: [Table 14]

[0337] The OLED D4 is 1000cd / m 2 An external quantum efficiency (EQE) of 16.3% was obtained at 1200 cd / m. The emission maximum was at 516 nm with a FWHM of 40 nm at 7.0 V. The corresponding CIEx value was 0.27 and CIEy value was 0.65. 2 The LT95 value of 1162h was determined.

Claims

1. Each independently of the other, (i) at least one p-host material H 2 P, said p-host material H 2 P having a lowest singlet excited state energy level E(S1 Ｈ ) and the lowest triplet excited state energy level E(T1 Ｈ ) and comprising or consisting of one first chemical moiety consisting of a structure according to formula H p -VIII and at least one second chemical moiety consisting of a structure according to any of formulas H p -XI, H p -XII, H p -XIII, H p -XIV, H p -XV, H p -XVII, H p -XVIII, and H p -XIX; 【Chemistry 1】 【Chemistry 2】 During the ceremony, Z 1 is a direct bond; R I , in each occurrence, independently of each other, is a single bond attachment site linking a first chemical moiety to a second chemical moiety or is selected from the group consisting of hydrogen, deuterium, Me, i Pr, t Bu; wherein at least one R I is a single bond attachment site linking a first chemical moiety to a second chemical moiety; And Ph, wherein Ph is optionally substituted with one or more substituents independently selected from the group consisting of Me, i Pr, t Bu and Ph; selected from the group consisting of: R II , in each occurrence, independently, is selected from the group consisting of hydrogen, deuterium, Me, i Pr, t Bu, and Ph, wherein Ph is optionally substituted with one or more substituents independently selected from the group consisting of Me, i Pr, t Bu, and Ph. selected from the group consisting of: wherein two or more adjacent substituents R II optionally form an aromatic or heteroaromatic ring system having 3 to 18 carbon atoms; (ii) at least one thermally activated delayed fluorescent (TADF) material E Ｂ , the thermally activated delayed fluorescent (TADF) material E Ｂ is the lowest singlet excited state energy level E(S1 Ｅ ) and the lowest triplet excited state energy level E(T1 Ｅ ) and having a structure represented by E B -I-3a or E B -I-4a; 【Chemistry 3】 During the ceremony, Y 1 is nitrogen (N); m is 1 or 2; n is 1 or 2; X2 is CN; Z 3 is a direct bond; R b , R c , and R d are each independently hydrogen or deuterium; wherein any adjacent substituents R b , R c and R d form, independently of one another, a monocyclic or polycyclic, aliphatic, aromatic and / or benzo-fused ring system; optionally one or more hydrogen atoms of the ring system so formed are replaced by R 12 ; R 13 at each occurrence is independently hydrogen, deuterium, or CN; wherein one or more hydrogen atoms are optionally replaced by C 6 -C 18 -aryl; And (iii) at least one light emitter S Ｂ , the light emitter S Ｂ is the lowest singlet excited state energy level E(S1 Ｓ ) and the lowest triplet excited state energy level E(T1 Ｓ ) and comprising or consisting of a structure represented by the formula S B -III-3a 【Chemistry 4】 wherein R VI , R VII , R VIII , R IX , R X , R XI , R XII , R XIII , R XIV , R XV , R XVI , R XVII , R XVIII , R XIX , R XX , R XXI , R XXII and R XXIII are each independently hydrogen, deuterium, C 6 -aryl, is selected from the group consisting of said C 6 -aryl is optionally substituted with one or more substituents R 21 ; R 21 at each occurrence, independently of other occurrences, is hydrogen, deuterium, C 1 -C 5 -alkyl, wherein optionally one or more hydrogen atoms are replaced, independently of one another, by deuterium, CN, CF 3 or F; is selected from the group consisting of R A is hydrogen, C 3 -C 4 -heteroaryl, where optionally one or more hydrogen atoms are replaced, independently of one another, by C 6 -C 18 -aryl, and C 6 -C 18 -aryl, where optionally one or more hydrogen atoms are replaced, independently of one another, by C 1 -C 5 -alkyl; Including, An organic electroluminescent device comprising one or more light-emitting layers B, Here, each E Ｂ energy is at least one S Ｂ Move to each S Ｂ emits light having an emission maximum between 500 nm and 560 nm, where the following formulas (1) to (5): E (S1) Ｈ )>E(S1 Ｅ ) (1) E (S1) Ｈ )>E(S1 Ｓ ) (2) E (S1) Ｅ )>E(S1 Ｓ ) (3) E(T1) Ｈ )>E(D1 Ｓ ) (4) E(T1) Ｈ )>E(D1 Ｅ ) (5) The relationship represented by The organic electroluminescence element.

2. TADF material E Ｂ is less than 0.4 eV, the lowest singlet excited state S1 Ｅ and the lowest triplet excited state T1 Ｅ ΔE, which corresponds to the energy difference ＳＴ The organic electroluminescence device according to claim 1 , wherein the organic electroluminescence device exhibits a value.

3. At least one illuminant S Ｂ 3. The organic electroluminescence device according to claim 1, wherein the organic electroluminescence device has an emission spectrum exhibiting a full width at half maximum (FWHM) of 0.25 eV or less.

4. At least one thermally activated delayed fluorescent (TADF) material E Ｂ has a maximum emission λ in the wavelength range of 500 nm to 560 nm ｍａｘ The organic electroluminescence device according to any one of claims 1 to 3, further comprising (D).

5. At least one thermally activated delayed fluorescent (TADF) material E Ｂ However, −6.0 eV≦E ＨＯＭＯ (E Ｂ ) ≦-5.8 eV with energy E ＨＯＭＯ (E Ｂ The highest occupied molecular orbital HOMO (E Ｂ 5. The organic electroluminescence device according to claim 1, further comprising:

6. Formula S Ｂ -III-3 by R Ａ The binding site of ３ ~C １５ -C of heteroaryl ３ ~C １５ - one of the carbon atoms, The organic electroluminescence device according to any one of claims 1 to 5.

7. −2.6 eV≦E ＬＵＭＯ (H Ｐ ) by energy E ＬＵＭＯ (H Ｐ ) having the lowest unoccupied molecular orbital LUMO (H Ｐ ) one or more p-host materials H Ｐ The organic electroluminescence device according to any one of claims 1 to 6, comprising:

8. 8. The organic electroluminescence device according to claim 1, which is a device selected from the group consisting of an organic light-emitting diode, a light-emitting electrochemical cell, and a light-emitting transistor.

9. At least one light-emitting layer B comprises (i) 10 to 89.9% by weight of one or more p-host compounds H Ｐ ; (ii) 0 to 79.9 wt. % of one or more n-host compounds H Ｎ ; (iii) 10 to 50 wt. % of one or more TADF materials E Ｂ and (iv) 0.1 to 10% by weight of one or more phosphors S Ｂ and (v) 0 to 72% by weight of one or more solvents Including, The organic electroluminescence device according to any one of claims 1 to 8.

10. At least one light-emitting layer B comprises (i) 22 to 87.5% by weight of one or more p-host compounds H Ｐ ; (ii) optionally, 0 to 65.5 wt. % of one or more n-host compounds H Ｎ ; (iii) 12 to 40 wt. % of one or more TADF materials E Ｂ and (iv) 0.5 to 5% by weight of one or more phosphors S Ｂ and (v) 0 to 65.5% by weight of one or more solvents Including, The organic electroluminescence device according to any one of claims 1 to 9.

11. 1. A method for producing green light at a wavelength between 500 nm and 560 nm, comprising: (i) providing an organic electroluminescence device according to any one of claims 1 to 10; (ii) applying a current to the organic electroluminescent device.

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