Organic electroluminescent green light emitting device

Abstract

The present application relates to an organic electroluminescent device comprising at least one light-emitting layer B, which comprises at least one host material H B at least one thermally activated delayed fluorescence (TADF) material E B and at least one small full width at half maximum (FWHM) emitter S B wherein E B transfers energy to S B and the emission maximum of S B is in the wavelength range of 500 nm to 560 nm.

Description

[0001] This invention relates to an organic electroluminescent device comprising at least one light-emitting layer B, wherein the light-emitting layer B comprises at least one host material H. B At least one thermally activated delayed fluorescence (TADF) material E B and at least one small half-peak full width at half maximum (FWHM) luminescent material S B E B Transfer energy to S B , making S B Glowing light. S B It emits narrow green light, exhibiting a small full width at half maximum (FWHM), with a maximum emission wavelength of 500 nm to 560 nm. Furthermore, this invention relates to a method for generating green light using the organic electroluminescent device of this invention.

[0002] Invention Description

[0003] Organic electroluminescent devices containing one or more organic-based light-emitting layers are becoming increasingly important. Organic electroluminescent devices include, for example, organic light-emitting diodes (OLEDs), light-emitting electrochemical cells (LECs), and light-emitting transistors. In particular, OLEDs are promising devices for electronic products such as screens, displays, and lighting equipment. Compared to most inorganic-based electroluminescent devices, organic-based OLEDs are generally quite flexible and can be fabricated in particularly thin layers. Existing OLED-based screens and displays either have good efficiency and long lifetime or good color purity and long lifetime, but they do not yet combine all three characteristics: good efficiency, long lifetime, and good color purity.

[0004] Therefore, there are still unmet technological needs for organic electroluminescent devices with high quantum yield, long lifetime and good color purity.

[0005] The color purity or color point of an OLED is typically represented by CIEx and CIEy coordinates, while the color gamut of next-generation displays is represented by so-called BT-2020 and DCPI3 values. Generally, to achieve these color coordinates, the top-emitting device needs to adjust the color coordinates by changing the cavity. To ensure high efficiency while achieving these color gamuts, the bottom-emitting device typically needs to produce a narrow emission spectrum.

[0006] Recently, some fluorescence near-range charge transfer (NRCT) emitters have been developed, which exhibit fairly narrow emission spectra with an FWHM of less than or equal to 0.25 eV, making them more suitable for achieving the BT-2020 and DCPI3 color gamuts.

[0007] The central element of an organic electroluminescent device (OLED) used to generate light is typically at least one emitting layer placed between the anode and the cathode. When a voltage (and current) is applied to the OLED, holes and electrons are injected from the anode and cathode, respectively. Typically, a hole transport layer is located between the emitting layer and the anode, while an electron transport layer is typically located between the emitting layer and the cathode. These different layers are arranged sequentially. High-energy excitons are then generated through recombination of holes and electrons in the emitting layer. Such excited states (e.g., singlet states such as S1 and / or triplet states such as T1) decay to the ground state (S0), resulting in luminescence.

[0008] Surprisingly, it has been found that the 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 narrow-field light emission with long lifetime, high quantum yield, and is well-suited for achieving the BT-2020 and DCPI3 color gamuts.

[0009] The at least one TADF material transfers energy to the at least one small full width at half maximum (FWHM) emitter, which exhibits green emission with a maximum emission wavelength of 500 nm to 560 nm.

[0010] Therefore, one aspect of the present invention relates to an organic electroluminescent device comprising one or more light-emitting layers B, each layer comprising independently of the other:

[0011] (i)

[0012] At least one host material H B It has the lowest excited singlet state energy level E(S1) H ) and the lowest excited triplet energy level E(T1) H );

[0013] (ii)

[0014] At least one TADF material E B It has the lowest excited singlet state energy level E(S1) E ) and the lowest excited triplet energy level E(T1) E );and

[0015] (ii)

[0016] At least one small FWHM light emitter S B It has the lowest excited singlet state energy level E(S1) S ) and the lowest excited triplet energy level E(T1) S ),

[0017] Each of them is E B Transfer energy to (at least) S B And (each) SB The emission of green light has a maximum emission value between 500 nm and 560 nm (wavelength range); the relationship between them is represented by the following formulas (1) to (5):

[0018] E(S1 H )>E(S1 E (1)

[0019] E(S1 H )>E(S1 S (2)

[0020] E(S1 E )>E(S1 S (3)

[0021] E(T1 H )>E(T1 S (4)

[0022] E(T1 H )>E(T1 E (5).

[0023] In a preferred embodiment, the at least one small full-width at half maximum (FWHM) emitter S B It is a boron-containing light emitter. In a preferred embodiment, each small full width at half maximum (FWHM) light emitter S B It is a boron-containing light emitter.

[0024] Therefore, the main material H B The lowest excited singlet state S1 H The energy is higher than that of TADF material E B The lowest excited singlet state S1 E Main material H B The lowest excited singlet state S1 H The energy is higher than the lowest excited singlet state S1 of any small FWHM luminescent body SB. S TADF material E B The lowest excited singlet state S1 E The energy is higher than the lowest excited singlet state S1 of any small FWHM luminescent body SB. S The lowest excited triplet state T1 of the host material HB H The energy is higher than the lowest excited triplet T1 of any small FWHM emitter SB. S Main material H B The lowest excited triplet state T1 H The energy is higher than that of TADF material E B The lowest excited triplet state T1 E .

[0025] In a preferred embodiment of the present invention, TADF material E B The lowest excited triplet state T1 E The energy is higher than any small FWHM light source. B The lowest excited triplet state T1 S :E(T1) E )>E(T1 S ).

[0026] In a preferred embodiment of the present invention, the electroluminescent device according to the present invention includes exactly one light-emitting layer B.

[0027] In another embodiment of the invention, the electroluminescent device according to the invention comprises exactly two light-emitting layers B.

[0028] In another embodiment of the invention, the electroluminescent device according to the invention includes more than two light-emitting layers B.

[0029] It should be understood that the multiple different light-emitting layers B optionally included in the same organic electroluminescent device according to the present invention do not necessarily all include the same material or the same proportion of the same material.

[0030] In one embodiment of the present invention, the at least one light-emitting layer B comprises at least one host material H. B , exactly one type of TADF material E B And exactly a small FWHM luminescent body S B .

[0031] In a preferred embodiment of the present invention, the at least one light-emitting layer B comprises only one host material H. B .

[0032] In a preferred embodiment of the present invention, the at least one light-emitting layer B comprises only one TADF material E. B .

[0033] In a preferred embodiment of the present invention, the at least one light-emitting layer B includes only a small FWHM light emitter S. B In a preferred embodiment of the invention, the at least one light-emitting layer B comprises only one host material H. B and only one TADF material E B In a preferred embodiment of the invention, the at least one light-emitting layer B comprises only one host material H. B and only one FWHM light emitter S B In a preferred embodiment of the present invention, the at least one light-emitting layer B comprises only one TADF material E. B and only one FWHM light emitter S BIn a preferred embodiment of the present invention, the at least one light-emitting layer B comprises only one host material H. B Only one type of TADF material E B and only one small FWHM light emitter S B .

[0034] In one embodiment, a small FWHM light emitter S B It exhibits thermally activated delayed fluorescence (TADF). In one embodiment, the TADF material E... B Presents a small FWHM. TADF material E B Optionally, it can emit light in the visible wavelength range, for example, having a maximum emission value in the wavelength range of 500 nm to 560 nm. In one embodiment, the TADF material E B It shows a small FWHM (e.g., less than or equal to 0.30 eV, less than or equal to 0.25 eV, less than or equal to 0.20 eV, less than or equal to 0.15 eV, or less than or equal to 0.13 eV).

[0035] A surprising discovery is that the main component of the emission band of the optoelectronic device of the present invention can generally be attributed to S. B The emission indicates that energy is emitted from E B Fully transfer to S B And preferably from at least one host material H B Transfer to E B and / or S B This indicates that at least one TADF material E B It can be used as at least one small FWHM light emitter S B The energy pump's main function is to emit green light.

[0036] Compared to emitters with similar device architectures, the emitter according to the present invention exhibits a longer lifetime and / or higher efficiency, wherein all at least one light-emitting layer comprises at least one host material H. B With at least one TADF material E B Or at least one small FWHM luminescent body S B (But you can't use both at the same time).

[0037] Of particular interest is E according to the present invention B and S B The combination of these elements allows energy to be transferred from lower energy states to higher energy states of other compounds. Furthermore, due to the reverse intersystem crossover (RISC) that occurs in TADF materials, the E of this invention... B and S B The combination of these can result in particularly efficient emission of the small FWHM emitting diode SB.

[0038] Another embodiment of the present invention relates to an electroluminescent device (e.g., an OLED) that has an efficiency of 1000 cd / m². 2 It exhibits an external quantum efficiency of greater than 10%, more preferably greater than 13%, more preferably greater than 15%, even more preferably greater than 18%, or even greater than 20%, and exhibits the maximum emission value between 500 nm and 560 nm.

[0039] Another embodiment of the present invention relates to an electroluminescent device (e.g., an OLED) that has an efficiency of 1000 cd / m². 2 It exhibits an external quantum efficiency of greater than 10%, more preferably greater than 13%, more preferably greater than 15%, even more preferably greater than 18%, or even greater than 20%, and exhibits maximum emission between 510 nm and 550 nm.

[0040] Another embodiment of the present invention relates to an electroluminescent device (e.g., an OLED) that has an efficiency of 1000 cd / m². 2 It exhibits an external quantum efficiency of more than 10%, more preferably more than 13%, more preferably more than 15%, even more preferably greater than 18%, or even greater than 20%, and exhibits maximum emission between 520 nm and 540 nm.

[0041] In a preferred embodiment, the electroluminescent device (e.g., OLED) operates at a constant current density J0 = 15 mA / cm². 2 The LT95 value exhibited is greater than 100 hours, preferably greater than 200 hours, more preferably greater than 400 hours, even more preferably greater than 750 hours, and even more preferably greater than 1000 hours.

[0042] Another embodiment of the invention relates to an electroluminescent device (e.g., an OLED) that emits light at different color points. According to the invention, the electroluminescent device (e.g., an OLED) emits light having a narrow emission band (small full width at half maximum (FWHM)). In a preferred embodiment, the FWHM of the main emission peak of the light emitted by the electroluminescent device (e.g., an OLED) according to the invention is below 0.25 eV, more preferably below 0.20 eV, even more preferably below 0.15 eV, or even below 0.13 eV.

[0043] Another embodiment of the invention relates to an electroluminescent device (e.g., an OLED) whose emitted light has CIEx and CIEy color coordinates close to the CIEx (=0.170) and CIEy (=0.797) color coordinates of the primary color green (as defined according to ITU-R BT.2020, i.e., Rec.2020). Therefore, it may be suitable for ultra-high definition (UHD) displays, such as UHD televisions. 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, top-emitting devices (where the top electrode is typically transparent) are commonly used, while the test device used throughout this application is a bottom-emitting device (where the bottom electrode and substrate are transparent). Therefore, another aspect of the present invention relates to an electroluminescent device (e.g., an OLED) whose emission exhibits CIEx color coordinates 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 more preferably between 0.15 and 0.20, and / or CIEy color coordinates 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 more preferably between 0.79 and 0.84.

[0044] Another embodiment of the present invention relates to an OLED whose emitted light has CIEx and CIEy color coordinates close to the CIEx (=0.265) and CIEy (=0.65) color coordinates of the primary color green (as defined in DCIP3). 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, top-emitting devices (top electrodes are typically transparent) are commonly used, while the test devices used throughout this application are bottom-emitting devices (bottom electrodes and substrates are transparent). Therefore, another aspect of the present invention relates to an OLED in which the CIEy color coordinates emitted from the bottom are 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 the CIEy color coordinates are 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.

[0045] One purpose of organic electroluminescent devices is to generate light. Therefore, the present invention also relates to a method for generating light within a desired wavelength range, comprising the step of providing an organic electroluminescent device according to any one of the present invention. Therefore, another aspect of the present invention relates to a method for generating light within a desired wavelength range, comprising the steps of:

[0046] (i)

[0047] Provided an organic electroluminescent device according to the present invention; and

[0048] (ii)

[0049] Apply current to the organic electroluminescent device

[0050] Another aspect of the invention relates to a method for manufacturing an organic electroluminescent device by assembling the aforementioned components. The invention also relates to a method for generating green light, particularly by using the organic electroluminescent device.

[0051] The embodiments and claims herein are intended to further illustrate the invention.

[0052] Main material H B

[0053] According to the present invention, any one or more host materials H contained in any at least one light-emitting layer B B It can be a p-host H with high hole mobility P n-host H with high electron mobility N Or a bipolar host material H that simultaneously possesses high hole mobility and high electron mobility BP .

[0054] 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 or more p-body H. P In one embodiment of the invention, at least one light-emitting layer B of the organic electroluminescent device according to the invention comprises only one p-body H. P .

[0055] 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 or more n-type bodies H. N In another embodiment of the invention, at least one light-emitting layer B of the organic electroluminescent device according to the invention comprises only one n-body H. N .

[0056] 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 or more bipolar bodies H. BP 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 only one bipolar body H. BP .

[0057] In another embodiment of the invention, at least one light-emitting layer B of the organic electroluminescent device according to the invention comprises at least two different host materials. In this case, the more than one host material present in at least one light-emitting layer B can be all p-hosts, all n-hosts, or all bipolar hosts, or a combination thereof.

[0058] It should be understood that if the organic electroluminescent device according to the present invention comprises more than one light-emitting layer B, then any one of them may independently comprise a host material H. B Or more than one main material H B H B This conforms to the above definition. It should also be understood that different light-emitting layers B included in the organic electroluminescent device of the present invention do not necessarily contain the same material or the same concentration of the same material.

[0059] The at least one p-body H P and at least one n-subject H N If included in the same light-emitting layer B of the organic electroluminescent device of the present invention, an exciplex can optionally be formed. Those skilled in the art know how to select H to form the exciton complex. P -H N Yes, and knows H including HOMO- and / or LUMO. P and H N The energy level requirement. That is to say, in cases where the formation of exciton complexes is expected, the p-type host material H... P The energy of the highest occupied molecular orbital (HOMO) can be higher than that of the n-type host material H N The HOMO is at least 0.20 eV high, and the p host material H P The energy of the lowest unoccupied molecular orbital (LUMO) can be higher than that of the host material H. N The LUMO is at least 0.20 eV higher.

[0060] In a preferred embodiment of the present invention, the at least one host material H B (e.g. H) P H N and / or bipolar subject H BP HB(H) is an organic host material, which, in the context of this invention, means that it does not contain any transition metals. In a preferred embodiment of the invention, all host materials in the electroluminescent device of the present invention are HB(H) P H N and / or bipolar subject H BP All of them are organic host materials, which in the context of this invention means that they do not contain any transition metals. Preferably, the at least one host material HB H is the preferred material for all main components. B (H P H N and / or bipolar subject H BP It is mainly composed of the elements hydrogen (H), carbon (C) and nitrogen (N), but may also include, for example, oxygen (O), boron (B), silicon (Si), fluorine (F) and bromine (Br).

[0061] According to the present invention, the p-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device P Having the highest occupied molecular orbital HOMO(H) P Its energy is E. HOMO (H P ), wherein the preferred value is: –6.1eV≤E HOMO (H P )≤–5.6eV.

[0062] According to the present invention, the p-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device according to the present invention P It has energy E LUMO( H P The lowest unoccupied molecular orbital LUMO (H) P ), wherein the preferred value is: –2.6eV≤E LUMO (H P ).

[0063] According to the present invention, the p-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device according to the present invention P It has the lowest excited singlet state energy level E(S1) p-H ), of which the preferred option is: E(S1) p-H) ≥3.0eV.

[0064] According to the present invention, the p-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device according to the present invention P It has the lowest excited triplet energy level E(T1) p-H ), of which the preferred option is: E(T1) p-H) ≥2.7eV.

[0065] It should be understood that any requirements or preferred features previously defined for the host material HB of any layer of at least one light-emitting layer B in the organic electroluminescent device according to the invention also preferably apply to the invention according to the following p-host HP. Therefore, in the preferred embodiment, the relationship represented by the following formulas (6) to (9) applies:

[0066] E(S1 p-H )>E(S1E (6)

[0067] E(S1 p-H )>E(S1 S (7)

[0068] E(T1 p-H )>E(T1 S (8)

[0069] E(T1 p-H )>E(T1 E (9).

[0070] Therefore, p-subject H P The lowest excited singlet state S1 p-H The energy is preferred to be higher than that of TADF material E B The lowest excited singlet state S1 E p main body H P The lowest excited singlet state S1 p-H The energy is preferably higher than that of any small FWHM emitter. B The lowest excited singlet state S1 S p main body H P The lowest excited triplet state T1 p-H Preferably, it has a higher energy than any small FWHM emitter S B The lowest excited triplet state T1 S p main body H P The lowest excited triplet state T1 p-H The energy is preferred to be higher than that of TADF material E B The lowest excited triplet state T1 E .

[0071] In a preferred embodiment of the invention, the p-body H is optionally contained in any layer of at least one light-emitting layer B. P Optionally includes or consists of the following:

[0072] ---A first chemical moiety, comprising or composed of according to formula H P -I、H P -II, H P -III, H P -IV, H P -V、H P -VI、H P -VII、H P The structural composition of any of -VIII, HP-IX, and HP-X:

[0073]

[0074]

[0075] and

[0076] ---One or more second chemical components, which comprise or are derived from formula H P -XI、H P -XII, H P -XIII, H P -XIV、H P -XV, H P -XVI, H P -XVII, H P The structural composition of any one of -XVIII, and H P -XIX:

[0077]

[0078]

[0079] It exists in the p-main material H P Each of at least one second chemical part is connected to the first chemical part by a single bond, which is represented by a dashed line in the above formula;

[0080] in

[0081] Z 1 Each time it appears, it is independently selected from direct bonds, C(R) II 2. C = C(R) II 2. C=O, C=NR II NR II O, Si(R) II )2,S,S(O) and S(O)2;

[0082] R I Each time it appears, it is an independent binding site for the single bond connecting the first chemical part and the second chemical part, or selected from: hydrogen, deuterium, Me, i Pr, t Bu, wherein at least one R I It is the binding site of the single bond connecting the first and second chemical parts, and

[0083] Ph, which is optionally selected independently of Me, i Pr, t Substituents of Bu and Ph;

[0084] R II Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Buhe

[0085] Ph, which is optionally selected independently of Me, i Pr, t Substituents of Bu and Ph;

[0086] Two or more adjacent substituents R II It can optionally form aromatic or heteroaromatic ring systems with 3 to 18 carbon atoms.

[0087] In even more preferred embodiments of the present invention, Z 1 Each time it appears, it is a direct bond and the adjacent substituent R II They do not combine to form another ring system.

[0088] In one or more preferred embodiments of the invention, one or more p-body H elements optionally included in the organic electroluminescent device of the invention are... P Choose a group consisting of the following structures:

[0089]

[0090]

[0091]

[0092] According to the present invention, the n-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention N It has energy E HOMO (H N The highest occupied molecular orbital (HOMO) of H N ), of which E is preferred. HOMO (H N )≤–5.9eV.

[0093] According to the present invention, the n-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention N It has energy E LUMO (H N The lowest unoccupied molecular orbital LUMO (H) N ), wherein the preferred value is: –3.5eV≤E LUMO (H N )≤–2.9eV.

[0094] According to the present invention, the n-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention N It has the lowest excited singlet state energy level E(S1) n-H ), of which the preferred option is: E(S1)n-H ≥3.0eV.

[0095] According to the present invention, the n-body H optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention N It has the lowest excited triplet energy level E(T1) n-H ), of which the preferred option is: E(T1) n-H ≥2.7eV.

[0096] It should be understood that the host material H previously described in at least one of the light-emitting layers B of the organic electroluminescent device of the present invention... B Any requirements or preferred properties defined also preferably apply to the n-body H of the present invention. N Therefore, in the preferred embodiment, the relationship expressed by the following formulas (10) to (13) is satisfied:

[0097] E(S1 n-H )>E(S1 E (10)

[0098] E(S1 n-H )>E(S1 S (11)

[0099] E(T1 n-H) >E(T1 S (12)

[0100] E(T1 n-H )>E(T1 E (13).

[0101] Therefore, the preferred subject H is n. N The lowest excited singlet state S1 n-H The energy is higher than that of TADF material E B The lowest excited singlet state S1 E n-subject H N The lowest excited singlet state S1 n-H Preferably, it has higher energy than any small FWHM emitter. B The lowest excited singlet state S1 S n-subject H N The lowest excited triplet state T1 n-H Preferably, it has higher energy than any small FWHM luminescent material. B The lowest excited triplet state T1 S Preferably, any n-body H N The lowest excited triplet state T1 n-H The energy is higher than any TADF material E B The lowest excited triplet state T1E .

[0102] In a preferred embodiment of the invention, the n-body H is optionally included in any one of the at least one light-emitting layers B. N Contains (or consists of) according to formula H N -I、H N -II and H N The structure of any one of -II:

[0103]

[0104] Where R III and R IV Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, Ph, which are optionally selected independently of each other from Me, i Pr, t Substituents of Bu and Ph; and a chemical structure selected from 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:

[0105]

[0106]

[0107] Where X 1 Is it oxygen (O), sulfur (S), or carbon (R)? V )2;

[0108] R V Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Buhe

[0109] Ph, which is optionally selected independently of Me, i Pr, t Substituents of Bu and Ph;

[0110] Two or more adjacent substituents R VIt can optionally form aromatic or heteroaromatic ring systems having 3-18 carbon atoms; and

[0111] Where in equation H N -I and H N In -II, at least one substituent R III It is CN; and

[0112] The dashed line represents the expression H. N -I、H N -II, or H N -III binding site.

[0113] In one or more preferred embodiments of the invention, one or more n-body H elements optionally included in the organic electroluminescent device according to the invention are... N Choose the group composed of the following chemical structures:

[0114]

[0115] In one embodiment of the present invention, the n-body H is contained in at least one light-emitting layer B of the organic electroluminescent device according to the present invention. N It does not contain any phosphine oxide groups, and in particular, it lacks n-host H. N It is bis[2-(diphenylphosphino)phenyl] ether oxide (DPEPO).

[0116] According to the present invention, the bipolar body H is optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device according to the present invention. BP Having the highest occupied molecular orbital HOMO(H) BP Its energy is E. HOMO (H BP ), wherein the preferred value is: –6.1eV≤E HOMO (H BP )≤–5.6eV.

[0117] According to the present invention, a bipolar body H is optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device according to the present invention. BP It has energy E LUMO (H BP The lowest unoccupied molecular orbital LUMO (H) BP ), wherein the preferred value is: –3.5eV≤E LUMO (H BP )≤–2.9eV.

[0118] According to the present invention, a bipolar body H is optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device according to the present invention. BP It has the lowest excited singlet state energy level E(S1)bp-H ), wherein preferably: E(S1) bp-H ≥3.0eV.

[0119] According to the present invention, a bipolar body H is optionally included in any layer of at least one light-emitting layer B of the organic electroluminescent device according to the present invention. BP It has the lowest excited triplet energy level E(T1) bp-H ), wherein preferably: E(T1) bp-H ≥2.7eV.

[0120] It should be understood that the host material H previously included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention... B Any requirements or preferred properties defined herein are also preferably applicable to the bipolar body H of the present invention. BP Therefore, in the preferred embodiment, the relationship expressed by the following formulas (14) to (17) is satisfied:

[0121] E(S1 bp-H) >E(S1 E (14)

[0122] E(S1 bp-H )>E(S1 S (15)

[0123] E(T1 bp-H )>E(T1 S (16)

[0124] E(T1 bp-H )>E(T1 E (17).

[0125] Therefore, the bipolar body H BP The lowest excited singlet state S1 bp-H The energy is preferred to be higher than that of TADF material E B The lowest excited singlet state S1 E Bipolar host H BP The lowest excited singlet state S1 bp-H The energy is preferably higher than that of any small FWHM luminescent material. B The lowest excited singlet state S1 S Bipolar host H BP The lowest excited triplet state T1 bp-H The energy is preferably higher than that of any small FWHM luminescent material. B The lowest excited triplet state T1 S Preferably, any bipolar host H BP The lowest excited triplet state T1 bp-H The energy is higher than any TADF material EB The lowest excited triplet state T1 E .

[0126] TADF material E B

[0127] According to the present invention, one or more thermally activated delayed fluorescence (TADF) materials E B Any of the following preferably exhibits a ΔEST value less than 0.4 eV, more preferably less than 0.3 eV, more preferably less than 0.2 eV, even more preferably less than 0.1 eV, or even less than 0.05 eV. Therefore, the ΔEST of the TADF material EB according to the invention is preferably small enough to allow the lowest excited singlet state S1E at room temperature (RT). The ΔEST value corresponds to the lowest excited singlet state S1. E and the lowest excited triplet state T1 E The energy difference between them. Therefore, according to the present invention, the TADF material E B The ΔEST is preferably small enough that the lowest excited singlet state S1 is obtained at room temperature (RT). E The thermal energy is refilled into the lowest excited triplet state T1 E (Also known as up-intersystem crossing or reverse intersystem crossing).

[0128] It should be understood that the small FWHM light emitter S contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention B It can also optionally have a ΔEST value of less than 0.4 eV and exhibit thermally activated delayed fluorescence (TADF). However, in the context of this invention, for any small FWHM emitter S B The aforementioned features are merely optional. Furthermore, the TADF material E of the present invention... B Preferably, the small FWHM light emitter S is different from that of the present invention. B Because of TADF material E B Primarily used to transfer energy to at least one small FWHM luminescent body S B The energy pump, and the contribution to the emission band of the optoelectronic device of the present invention is preferably mainly attributed to the at least one small FWHM light emitter S. B The launch.

[0129] According to the present invention, the TADF material E is included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy E HOMO (E B The highest occupied molecular orbital (HOMO) of ) B), where best: –6.0eV≤E HOMO (E B )≤–5.8eV.

[0130] According to the present invention, the TADF material E is included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy of E LUMO (E B The lowest unoccupied molecular orbital LUMO (E) B ), where best: –3.4eV≤E LUMO (E B )≤–3.0eV.

[0131] According to the present invention, the TADF material E is included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has the lowest excited singlet state energy level E(S1) E ), wherein preferably: 2.5eV≤E(S1) E ≤2.8eV.

[0132] According to the present invention, the TADF material E is included in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has the lowest excited triplet energy level E(T1) E Its preferred range can be determined based on the singlet energy level E(S1) mentioned above. E The preferred range of ) and the preferred range of ΔEST mentioned above.

[0133] In a preferred embodiment of the present invention, TADF material E B It has a maximum emission value in the wavelength range of 480nm to 560nm, preferably 500nm to 540nm.

[0134] In a preferred embodiment of the present invention, TADF material E B It is an organic TADF material, which in the context of this invention means that it does not contain any transition metals. Preferably, the TADF material E of this invention... B It is mainly composed of the elements hydrogen (H), carbon (C) and nitrogen (N), but may also include, for example, oxygen (O), boron (B), silicon (Si), fluorine (F) and bromine (Br).

[0135] In one embodiment of the present invention, the at least one TADF material E B Each of them comprises at least one electron-donating portion D (i.e., donor) and at least one electron-withdrawing portion A (i.e., acceptor), wherein the at least one donor D and the at least one acceptor A are covalently linked to the same link;

[0136] The link is an aromatic or heteroaromatic group having 3 to 30 carbon atoms, preferably benzene or biphenyl.

[0137] In a preferred embodiment of the invention, each part D comprises (or consists of) a structure represented by any of the following structural formulas:

[0138]

[0139]

[0140]

[0141] in

[0142] Z 2 Each time it appears, it is selected independently from direct keys and CR. 1 R 2 C = CR 1 R 2 C=O, C=NR 1 NR 1 O, SiR 1 R 2 S, S(O) and S(O)2;

[0143] # indicates the binding site between donor portion D and the above-mentioned link;

[0144] R a R 1 and R 2 Each time it appears, it is independently selected from: hydrogen, deuterium, N(R) 3 2. OR 3 Si(R) 3 3. B(OR) 3 2. OSO2R 3 CF3, CN, F, Cl, Br, I,

[0145] C1-C 40 -alkyl,

[0146] It is optionally substituent by one or more substituents R 3 and

[0147] One or more non-adjacent CH2- groups are optionally R 3 C = CR 3 C≡C, Si(R) 3 )2、Ge(R 3 )2、Sn(R 3 2. C=O, C=S, C=substitutes for Se, C=NR 3 、P(=O)(R3 SO, SO2, NR 3 O, S or CONR 3 ;

[0148] C1-C 40 -alkoxy,

[0149] It is optionally substituent by one or more substituents R 3 and

[0150] One or more non-adjacent CH2- groups are optionally R 3 C = CR 3 C≡C, Si(R) 3 )2、Ge(R 3 )2、Sn(R 3 2. C=O, C=S, C=substitutes for Se, C=NR 3 、P(=O)(R 3 SO, SO2, NR 3 O, S or CONR 3 ;

[0151] C1-C 40 -Thioalkoxy,

[0152] It is optionally substituent by one or more substituents R 3 and

[0153] One or more non-adjacent CH2- groups are optionally R 3 C = CR 3 C≡C, Si(R) 3 )2、Ge(R 3 )2、Sn(R 3 2. C=O, C=S, C=substitutes for Se, C=NR 3 、P(=O)(R 3 SO, SO2, NR 3 O, S or CONR 3 ;

[0154] C2-C 40 -Alkenyl

[0155] It is optionally substituent by one or more substituents R 3 and

[0156] One or more non-adjacent CH2- groups are optionally R 3 C = CR 3 C≡C, Si(R) 3 )2、Ge(R 3 )2、Sn(R 32. C=O, C=S, C=substitutes for Se, C=NR 3 、P(=O)(R 3 SO, SO2, NR 3 O, S or CONR 3 ;

[0157] C2-C 40 -Alkyne group.

[0158] It is optionally substituent by one or more substituents R 3 and

[0159] One or more non-adjacent CH2- groups are optionally R 3 C = CR 3 C≡C, Si(R) 3 )2、Ge(R 3 )2、Sn(R 3 2. C=O, C=S, C=substitutes for Se, C=NR 3 、P(=O)(R 3 SO, SO2, NR 3 O, S or CONR 3 ;

[0160] C6-C 60 -Aryl,

[0161] It is optionally substituent by one or more substituents R 3 Replace; and

[0162] C3-C 57 - heteroaryl

[0163] It is optionally substituent by one or more substituents R 3 replace;

[0164] R 3 Each of these elements is selected independently from the following: hydrogen, deuterium, OPh, CF3, CN, F, and C1-C5-alkyl.

[0165] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0166] C1-C5-alkoxy,

[0167] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0168] C1-C5-thioalkoxy,

[0169] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0170] C2-C5-alkenyl,

[0171] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0172] C2-C5-alkynyl group,

[0173] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0174] C6-C 18 -Aryl,

[0175] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0176] C3-C 17 - heteroaryl

[0177] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0178] N(C6-C 18 -aryl)2;

[0179] N(C3-C 17 -heteroaryl)2, and

[0180] N(C3-C 17 -heteroaryl)(C6-C 18 -aryl);

[0181] Optionally, any substituent R a R 1 and R 2 They can independently react with one or more adjacent substituents R. a R 1 and R 2 Formation of monocyclic or polycyclic, aliphatic, aromatic, and / or benzo[a]-fused ring systems, wherein one or more hydrogen atoms of the ring system thus formed may be R 3 replace.

[0182] In a preferred embodiment of the invention, the donor portion D is not unsubstituted carbazole.

[0183] In a preferred embodiment of the invention, each receptor portion A comprises (or consists of) a chemical structure represented by any of the following structural formulas:

[0184]

[0185]

[0186]

[0187]

[0188] in

[0189] The dashed line represents a single bond that connects receptor portion A to the link described above;

[0190] R 4 Each of these elements is selected independently from the following: hydrogen, deuterium, N(R5)2, OR5, Si(R5)3, B(OR5)2, OSO2R5, CF3, CN, F, Cl, Br, I.

[0191] C1-C 40 -alkyl,

[0192] It is optionally substituent by one or more substituents R 5 Replace, and

[0193] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 5 O, S or CONR 5 ;

[0194] C1-C 40 -alkoxy,

[0195] It is optionally substituent by one or more substituents R 5 Replace, and

[0196] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 5 O, S or CONR 5 ;

[0197] C1-C 40 -Thioalkoxy,

[0198] It is optionally substituent by one or more substituents R5 Replace, and

[0199] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 5 O, S or CONR 5 ;

[0200] C2-C 40 -Alkenyl

[0201] It is optionally substituent by one or more substituents R 5 Replace, and

[0202] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 5 O, S or CONR 5 ;

[0203] C2-C 40 -Alkyne group.

[0204] It is optionally substituent by one or more substituents R 5 Replace, and

[0205] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 5 O, S or CONR 5 ;

[0206] C6-C 60 -Aryl,

[0207] It may be optionally substituted by one or more substituents R5; and

[0208] C3-C 57 - heteroaryl

[0209] It is optionally substituent by one or more substituents R 5 replace;

[0210] R 5 Each of these elements is selected independently from the following: hydrogen, deuterium, OPh, CF3, CN, F, and C1-C5-alkyl.

[0211] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0212] C1-C5-alkoxy,

[0213] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0214] C1-C5-thioalkoxy,

[0215] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0216] C2-C5-alkenyl,

[0217] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0218] C2-C5-alkynyl group,

[0219] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0220] C6-C 18 -Aryl,

[0221] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0222] C3-C 17 - heteroaryl

[0223] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0224] N(C6-C 18 -aryl)2;

[0225] N(C3-C 17 -heteroaryl)2, and

[0226] N(C3-C 17-heteroaryl)(C6-C 18 -aryl);

[0227] Optionally, two or more adjacent substituents R 4 They can independently form monocyclic or polycyclic, aliphatic, aromatic, and / or benzo[a]-fused ring systems, wherein one or more hydrogen atoms of the ring system optionally formed in this way can be R[a]-[b]-[c ... 5 replace.

[0228] In one or even a more preferred embodiment of the present invention, the at least one TADF material E B Each of them contains at least one electron-donating part D (i.e., donor) and at least one electron-withdrawing part A (i.e., acceptor), wherein all donors D and all acceptors A are covalently linked to the same link;

[0229] The link is an aromatic or heteroaromatic group having 3 to 30 carbon atoms, preferably benzene or biphenyl;

[0230] Wherein, each of the above-mentioned donor portions D comprises (or is composed of) a chemical structure represented by any of the above-described structural formulas; and

[0231] Wherein, each of the above-mentioned receptor portions A comprises (or is composed of) a chemical structure represented by any of the above structural formulas; and

[0232] Where R 1 and R 2 Each time it appears, it is independently selected from: hydrogen, deuterium, CN, CF3, C1-C5-alkyl.

[0233] One or more hydrogen atoms may be optionally replaced by deuterium;

[0234] C6-C 18 -Aryl,

[0235] It is optionally substituent by one or more substituents R 3 Replace; and

[0236] C3-C 17 - heteroaryl

[0237] It is optionally substituent by one or more substituents R 3 replace;

[0238] R 4 Each time it appears, it is independently selected from: hydrogen, deuterium, CN, CF3, C1-C5-alkyl.

[0239] One or more hydrogen atoms may be optionally replaced by deuterium;

[0240] C6-C 18 -Aryl,

[0241] It is optionally substituent by one or more substituents R 5 Replace; and

[0242] C3-C 17 - heteroaryl

[0243] It is optionally substituent by one or more substituents R 5 replace;

[0244] R 3 and R 5 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 and

[0245] Phenyl, which may optionally be selected independently of one or more of Me, i Pr, t Substituents of Bu, CN, CF3, and Ph; and

[0246] R a Each time it appears, it is independently selected from: hydrogen, Me, i Pr, t Bu, CN, CF3

[0247] Ph, which is optionally selected independently of Me, i Pr, t Substitution of Bu, CN, CF3 and Ph groups

[0248] Pyridyl group, which may optionally be composed of one or more groups independently selected from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0249] Pyrimidine group, which may optionally be selected independently of one or more compounds from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0250] Carbazolyl, which is optionally composed of one or more groups independently selected from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0251] Triazine group, which may optionally be selected independently of one or more of Me, i Pr, t Substituents of Bu, CN, CF3, and Ph; and

[0252] N(Ph)2;

[0253] In one or even a more preferred embodiment of the present invention, the at least one TADF material E B Each of them contains at least one electron-donating part D (i.e., donor) and at least one electron-withdrawing part A (i.e., acceptor), wherein all donors D and all acceptors A are covalently linked to the same link;

[0254] The link is an aromatic or heteroaromatic group having 3 to 30 carbon atoms, preferably benzene or biphenyl;

[0255] Wherein, each of the aforementioned donor portions D comprises (or is composed of) a structure represented by any of the above structural formulas; and

[0256] Wherein, each of the above-mentioned receptor portions A comprises (or is composed of) a structure represented by any of the above structural formulas; and

[0257] Where R 1 R 2 R 3 and R 4 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 and

[0258] Phenyl, which may optionally be selected independently of one or more of Me, i Pr, t Substituents of Bu, CN, CF3 and Ph;

[0259] R a Each time it appears, it is independently selected from: hydrogen, Me, i Pr, t Bu, CN, CF3

[0260] Ph, which is optionally selected independently of Me, i Pr, t Substituents of Bu, CN, CF3, and Ph; and

[0261] Triazine group, which may optionally be selected independently of one or more of Me, i Pr, t Substituents of Bu, CN, CF3 and Ph.

[0262] In one embodiment of the present invention, the at least one TADF material E B Each of these is an organic TADF material, which includes:

[0263] ---One or more first chemical components R 6 Each independently contains formula EB -I is a structure or is composed of it.

[0264]

[0265] and

[0266] ---Optionally, a second chemical part, comprising formula E B -II or E B -III's structure or composition,

[0267]

[0268] Each of the second chemical parts (if present) is connected to the first chemical part R via a single bond. 6 ;

[0269] in

[0270] # Represents Part 1 Chemistry R 6 The binding site with the second chemical part is either hydrogen;

[0271] k is 0, 1, 2, 3 or 4 each time it appears;

[0272] Each occurrence of m is independently 0, 1, or 2;

[0273] n is 0, 1, or 2 independently each time it appears;

[0274] o is 0 or 1 independently each time it appears;

[0275] p is 0, 1, or 2 independently of each other when it appears;

[0276] Each occurrence of q is independently 0, 1, or 2;

[0277] r is 0, 1, 2, 3, 4 or 5 each time it appears;

[0278] Q 1 Each time it appears, it is independently selected from N and CR. 6 and CR 7 ;

[0279] Q 2 Each time it appears, it is selected independently from C-Ar. EWG and CR Q2 ;

[0280] Q 3 Each occurrence is independently selected from N, C-Ar. EWG and CR Q2 ;

[0281] Q4 is selected independently from CR each time it appears. 6 C-Ar EWG and CR Q2 ;

[0282] X2 is selected independently from Ar each time it appears. EWG CN and CF3;

[0283] Ar EWG Each occurrence is independent of the others, and can be represented by any of the following structural formulas: 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, Ar EWG -XIII and Ar EWG -XIV,

[0284]

[0285] Its location, marked by a dashed line, is related to the core structure (preferred form E here). B -I) bonding;

[0286] R Z1 Each time it appears, it is selected independently from CN and CF3;

[0287] Z 3 Each time it appears, it is selected independently from direct keys and CR. 9 R 10 C = CR 9 R 10 C=O, C=NR 9 NR 9 O, SiR 9 R 10 S, S(O) and S(O)2;

[0288] R e Each time it appears, it is independently selected from: hydrogen, deuterium, F, Cl, Br, and I.

[0289] C1-C5-alkyl,

[0290] One or more hydrogen atoms may be optionally replaced by deuterium;

[0291] C6-C 18 -Aryl,

[0292] It may be optionally substituted by one or more substituents independently selected from the group consisting of: deuterium, C1-C5-alkyl, C6-C 18 -Aryl, F, Cl, Br and I;

[0293] R 7 Each time it appears, it is independently selected from: hydrogen, deuterium, CN, CF3.

[0294] C1-C5-alkyl,

[0295] One or more hydrogen atoms may be optionally replaced by deuterium;

[0296] C6-C 18 -Aryl,

[0297] It is optionally substituent by one or more substituents R 11 Replace; and

[0298] C3-C 17 - heteroaryl

[0299] It is optionally substituent by one or more substituents R 11 replace;

[0300] R 8 Each time it appears, it is independently selected from: hydrogen, deuterium, CN, CF3.

[0301] C1-C5-alkyl,

[0302] One or more hydrogen atoms may be optionally replaced by deuterium;

[0303] C6-C 18 -Aryl,

[0304] It is optionally substituent by one or more substituents R 11 Replace; and

[0305] C3-C 17 - heteroaryl

[0306] It is optionally substituent by one or more substituents R 11 replace;

[0307] R Q2 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, Ph, and carbazole group, which are optionally selected independently of each other by one or more of Me, i Pr, tSubstituents of Bu, CN, CF3, Ph and N(Ph)2;

[0308] R b R c R d R 9 and R 10 Each time it appears, it is independently selected from: hydrogen, deuterium, N(R) 12 2. OR 12 Si(R) 12 3. B(OR) 12 2. OSO2R 12 ,CF3,CN,F,Br,I,

[0309] C1-C 40 -alkyl,

[0310] It is optionally substituent by one or more substituents R 12 Replace, and

[0311] One or more non-adjacent CH2- groups are optionally R12C=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, SO2, NR 12 O, S or CONR 12 ;

[0312] C1-C 40 -alkoxy,

[0313] It is optionally substituent by one or more substituents R 12 Replace, and

[0314] One or more non-adjacent CH2- groups are optionally R12C=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, SO2, NR 12 O, S or CONR 12 ;

[0315] C1-C 40 -Thioalkoxy,

[0316] It is optionally substituent by one or more substituents R 12 Replace, and

[0317] One or more non-adjacent CH2- groups are optionally R12C=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, SO2, NR 12 O, S or CONR 12 ;

[0318] C2-C 40 -Alkenyl

[0319] It is optionally substituent by one or more substituents R 12 Replace, and

[0320] One or more non-adjacent CH2- groups are optionally R12C=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, SO2, NR 12 O, S or CONR 12 ;

[0321] C2-C 40 -Alkyne group.

[0322] It is optionally substituent by one or more substituents R 12 Replace, and

[0323] One or more non-adjacent CH2- groups are optionally R12C=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, SO2, NR 12 O, S or CONR 12 ;

[0324] C6-C 60 -Aryl,

[0325] It is optionally substituent by one or more substituents R 12 Replace; and

[0326] C3-C 57 - heteroaryl

[0327] It is optionally substituent by one or more substituents R 12 replace;

[0328] R 11 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, and phenyl, which are optionally selected independently of each other from Me, CN, CF3, and phenyl. i Pr, t Substituents of Bu, CN, CF3 and Ph;

[0329] R 12 Each of these elements is selected independently from the following: hydrogen, deuterium, OPh, CF3, CN, F, and C1-C5-alkyl.

[0330] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0331] C1-C5-alkoxy,

[0332] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0333] C1-C5-thioalkoxy,

[0334] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0335] C2-C5-alkenyl,

[0336] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0337] C2-C5-alkynyl group,

[0338] One or more hydrogen atoms may be optionally substituted independently of each other with deuterium, CN, CF3 or F;

[0339] C6-C 18 -Aryl,

[0340] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0341] C3-C 17 - heteroaryl

[0342] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0343] N(C6-C 18 -aryl)2;

[0344] N(C3-C 17 -heteroaryl)2,

[0345] N(C3-C 17 -heteroaryl)(C6-C 18 -aryl), and

[0346] Aliphatic cyclic amino groups containing 5 to 8 carbon atoms (preferably pyrrolidinyl and piperidinyl);

[0347] Optionally, any adjacent substituent R b R c R d R 9 and R 10 Independently forming monocyclic or polycyclic, aliphatic, aromatic, and / or benzo[a]-fused ring systems; wherein one or more hydrogen atoms of the ring system optionally formed in this way can be R 12 Replace; and

[0348] At least one, but no more than three, groups Q 1 It is nitrogen (N), but in formula E B -II Two adjacent groups Q 1 Not all of them are N; and

[0349] At least one, but no more than three, groups Q 1 For CR 6 However, in formula E B In -II, two adjacent groups Q 1 Not all of them are CR 6 ;and

[0350] Where E B In -III, at least one group Q 3 For nitrogen (N); and

[0351] The preferred order is: 1 ≤ (m + p) ≤ 4; and

[0352] 1≤(n+q)≤4; and

[0353] 1≤(m+n+o)≤5.

[0354] In a preferred embodiment of the present invention, as long as Z 3 It's a direct key, R b R c and R d At least one substituent in it is not hydrogen, therefore TADF material EB The donor portion is preferably not an unsubstituted carbazole group.

[0355] In a preferred embodiment of the present invention

[0356] R 7 Each time it appears, it is independently selected from hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 and

[0357] Ph, which is optionally selected independently of one or more hydrogen, deuterium, Me, i Pr, t Substituents of Bu, CN, CF3 and phenyl groups;

[0358] R 8 Each time it appears, it is independently chosen from hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 and

[0359] Ph, which is optionally selected independently of one or more hydrogen, deuterium, Me, i Pr, t Substituents of Bu, CN, CF3 and phenyl groups;

[0360] R Q2 Each time it appears, it is selected independently from: hydrogen, deuterium, Ph.

[0361] Carbazolyl, which is optionally selected independently of one or more of Me, i Pr, t Substituents of Bu, CN, CF3, Ph and N(Ph)2;

[0362] R b R c and R d Each time it appears, it is independent of the selection from hydrogen, Me, i Pr, t Bu, CN, CF3

[0363] Ph, which is optionally selected independently of Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0364] Pyridyl group, which may optionally be composed of one or more groups independently selected from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0365] Pyrimidine group, which may optionally be selected independently of one or more compounds from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0366] Carbazolyl, which is optionally composed of one or more groups independently selected from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0367] Triazine group, which is optionally selected independently of one or more components from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0368] and N(Ph)2;

[0369] R e Each time it appears, it is selected independently from: hydrogen, deuterium,

[0370] C1-C5-alkyl,

[0371] One or more hydrogen atoms may be optionally replaced by deuterium;

[0372] C6-C 18 Aryl,

[0373] It is optionally composed of one or more C1-C5-alkyl groups and / or one or more C6-C4-alkyl groups. 18 -Aryl substitution;

[0374] Optionally, any adjacent substituent R b R c R d R 9 and R 10 Independently forming monocyclic or polycyclic, aliphatic, aromatic, and / or benzo[a]-fused ring systems containing 3 to 30 carbon atoms; and

[0375] In addition to the above, the definitions mentioned above also apply.

[0376] In one or even a more preferred embodiment of the invention, Z 3 It always appears as a direct key; and R. 7 Each time it appears, it is independently selected from: hydrogen, deuterium, CN, CF3.

[0377] C1-C5-alkyl,

[0378] One or more hydrogen atoms may be optionally replaced by deuterium;

[0379] C6-C 18 -Aryl,

[0380] It is optionally substituent by one or more substituents R 11 Replace; and

[0381] C3-C 17 - heteroaryl

[0382] It is optionally substituent by one or more substituents R 11 replace;

[0383] R 8 Each time it appears, it is independently selected from: hydrogen, deuterium, CN, CF3.

[0384] C1-C5-alkyl,

[0385] One or more hydrogen atoms may be optionally replaced by deuterium;

[0386] C6-C 18 -Aryl,

[0387] It is optionally substituent by one or more substituents R 11 Replace; and

[0388] C3-C 17 - heteroaryl

[0389] It is optionally controlled by one or more R 11 Substituents are selected independently of each other, including hydrogen, deuterium, and me, each time they appear. i Pr, t Bu, CN, CF3 and

[0390] Ph, which is optionally selected independently of one or more hydrogen, deuterium, Me, i Pr, t Substituents of Bu, CN, CF3 and phenyl groups;

[0391] R Q2 Each time it appears, it is selected independently from: hydrogen, deuterium, Ph, and

[0392] The carbazoyl group is optionally substituted by one or more substituents selected independently of each other from Ph and N(Ph)2;

[0393] R b R c and R d Each time it appears, it is independently selected from hydrogen, Me, i Pr, t Bu, CN, CF3 and

[0394] Ph, which is optionally selected independently of Me, i Pr, tSubstituents of Bu, CN, CF3 and Ph;

[0395] Carbazolyl, which is optionally composed of one or more groups independently selected from Me, i Pr, t Substituents of Bu, CN, CF3 and Ph;

[0396] Triazine group, which is optionally selected independently of one or more components from Me, i Pr, t Substituents of Bu, CN, CF3, and Ph; and

[0397] R e Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, and

[0398] C6-C 18 -Aryl,

[0399] Its optional selection is made from one or more of deuterium, Me, i Pr, t Substituents of Bu;

[0400] Optionally, any adjacent substituent R b R c R d R 9 and R 10 Independently forming monocyclic or polycyclic, aliphatic, aromatic, and / or benzo[a]-fused ring systems containing 3 to 18 carbon atoms; and

[0401] In addition to the above, the definitions mentioned above also apply.

[0402] In one or even a more preferred embodiment of the invention, Z 3 It is a direct key every time it appears; and

[0403] R 7 Each time it appears, it is independently selected from hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 and

[0404] Ph, which is optionally selected independently of one or more hydrogen, deuterium, Me, i Pr, t Substituents of Bu, CN, CF3 and phenyl groups;

[0405] R 8 Each time it appears, it is independently chosen from hydrogen, deuterium, Me, i Pr, tBu, CN, CF3 and

[0406] Ph, which is optionally selected independently of one or more hydrogen, deuterium, Me, i Pr, t Substituents of Bu, CN, CF3 and phenyl groups;

[0407] R Q2 Each time it appears, it is selected independently from: hydrogen, deuterium, and

[0408] Carbazolyl, which is optionally substituted by one or more substituents selected independently of each other from Ph and N(Ph)2;

[0409] R b It is hydrogen each time it appears;

[0410] R c and R d Each time it appears, it is independently selected from: hydrogen, Me, i Pr, t Bu, CN, CF3

[0411] Ph, which is optionally selected independently of Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0412] Pyridyl group, which may optionally be composed of one or more groups independently selected from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0413] Pyrimidine group, which may optionally be selected independently of one or more compounds from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0414] Carbazolyl, which is optionally composed of one or more groups independently selected from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0415] Triazine group, which is optionally selected independently of one or more components from Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0416] and N(Ph)2;

[0417] R e Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr,t Buhe

[0418] Ph, which is optionally selected from one or more elements chosen from deuterium, Me, i Pr, t Substituents of Bu; and

[0419] In addition to the above, the definitions mentioned above also apply.

[0420] In a particularly preferred embodiment of the invention, Z 3 It always appears as a direct key; and Ar EWG Each time it appears, it is selected independently from 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's structure;

[0421] R 7 Each time it appears, it is independently selected from hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 and

[0422] Ph, which is optionally selected independently of one or more hydrogen, deuterium, Me, i Pr, t Substituents of Bu, CN, CF3 and phenyl groups;

[0423] R 8 Each time it appears, it is independently chosen from hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3 and

[0424] Ph, which is optionally selected independently of one or more hydrogen, deuterium, Me, i Pr, t Substituents of Bu, CN, CF3 and phenyl groups;

[0425] R Q2 Each time it appears, it is selected independently from: hydrogen, deuterium, and

[0426] The carbazoyl group is optionally substituted by one or more substituents selected independently of each other from Ph and N(Ph)2;

[0427] R b It is hydrogen each time it appears;

[0428] Rc and R d Each time it appears, it is independently selected from: hydrogen, Me, i Pr, t Bu, CN, CF3 and

[0429] Ph, which is optionally selected independently of Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0430] Carbazolyl, which is optionally composed of one or more groups independently selected from Me, i Pr, t Substituents of Bu, CN, CF3 and Ph;

[0431] R e It is hydrogen each time it appears; and

[0432] In addition to the above, the definitions mentioned above also apply.

[0433] In one embodiment of the present invention, one or more TADF materials E B Each of the following has 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 The structure represented by any one of -I-8:

[0434]

[0435]

[0436]

[0437] in

[0438] Y 1 Each occurrence is either nitrogen (N) or CH, and at least one Y. 1 Let N be the number of people in the group.

[0439] R 13 Each time it appears, it is selected independently from: hydrogen, deuterium, CN, CF3, Ar. EWG C1-C5-alkyl

[0440] One or more hydrogen atoms may be optionally replaced by deuterium;

[0441] C6-C18 -Aryl,

[0442] It is optionally composed of one or more elements independently selected from deuterium, C1-C5-alkyl, and C6-C 18 -Aryl substituents; and

[0443] R 14 and R 15 Each time it appears, it is selected independently from C-Ar. EWG and CR Q2 ;

[0444] R 16 Each time it appears, it is selected independently from CR. 6 C-Ar EWG and CR Q2 The group formed;

[0445] No more than two groups R 13 Is it CN, CF3, or Ar? EWG ;and

[0446] In addition to the above, the definitions mentioned above also apply.

[0447] In a preferred embodiment of the present invention, the one or more TADF materials E B Each of the following has 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 The structure represented by any of -I-8 (see above),

[0448]

[0449]

[0450]

[0451]

[0452] Where R 13 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, Ar EWG and

[0453] Ph, which is optionally selected independently of one or more of deuterium, Me, i Pr, t Substituents of Bu and Ph;

[0454] No more than two groups R 13 Is it CN, CF3, or Ar? EWG ;and

[0455] In addition to the above, the definitions mentioned above also apply.

[0456] Optionally, any adjacent substituent R b R c R d R 9 and R 10 They can independently form monocyclic or polycyclic, aliphatic, aromatic, and / or benzo[a]-fused ring systems; wherein one or more hydrogen atoms in the ring system optionally formed in this way can be R 12 replace.

[0457] In a preferred embodiment, no more than two groups R 13 Is it CN, CF3, or Ar? EWG .

[0458] In a preferred embodiment: 1≤(m+p) and / or 1≤(n+q).

[0459] In an even more preferred embodiment of the present invention, one or more TADF materials E B Each of them has 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 The structure of any of the representations in -I-8 (see above).

[0460]

[0461]

[0462]

[0463]

[0464] Where R 13 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, iPr, t Bu, CN, CF3, Ar EWG and

[0465] Ph, which is optionally selected independently of one or more of deuterium, Me, i Pr, t Substituents of Bu and Ph; wherein no more than two R groups are attached to the same benzene ring. 13 Is it CN, CF3, or Ar? EWG ;and

[0466] In addition to the above, the definitions mentioned above also apply.

[0467] In one or more preferred embodiments of the present invention, one or more TADF materials E B Each of them has 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 The structure represented by any one of -I-8

[0468] Z 3 It is a direct key each time it appears; and

[0469] In addition to the above, the definitions mentioned above also apply.

[0470] In a preferred embodiment of the present invention, X 2 Each occurrence is independently selected from CN.

[0471]

[0472] The positions marked by the dashed lines are combined.

[0473] In a preferred embodiment of the present invention, Y 1 It appears as nitrogen (N) each time.

[0474] In a particularly preferred embodiment of the invention, one or more TADF materials E B Each of the following has E B -I-3a-1a、E B -I-3a-1b、E B -I-4a-1a and E B The structure represented by any one of -I-4a-1b:

[0475]

[0476]

[0477] Wherein R is preferred EWG Each time it appears, it is independently selected from: hydrogen, CN, and

[0478]

[0479] Preferably, in formula E B -I-3a-1a and E B In -I-4a-1a, two R groups connected to the same benzene ring... EWG One of them happens to be hydrogen.

[0480] The following are some TADF materials used in the organic electroluminescent devices of this invention. B Examples are given, but the present invention is not limited to devices containing these molecules.

[0481] Formula E B -I-3a-1a TADF material E B A particularly preferred example:

[0482]

[0483] Formula E B -I-3a-1b TADF material E B A particularly preferred example:

[0484]

[0485] The following lists the formulas based on E. B -I-4a-1a TADF material E B A particularly preferred example:

[0486]

[0487]

[0488]

[0489]

[0490] Formula E B -I-4a-1b TADF material E B A particularly preferred example:

[0491]

[0492] The TADF material E used in this invention B Other examples:

[0493]

[0494]

[0495]

[0496]

[0497]

[0498]

[0499]

[0500]

[0501] TADF material E B The synthesis can be carried out using standard reactions and reaction conditions known to those skilled in the art. Typically, in the first step, a coupling reaction can be performed, preferably a palladium-catalyzed coupling reaction, for example, using formula E below. B -I-3a-1 TADF material E B In the synthesis:

[0502]

[0503] E1 can be any boric acid (R B =H) or equivalent borate ester (R) B =alkyl or aryl), especially two R B A ring is formed to produce, for example, a fluoro-(trifluoromethyl)phenyl, difluoro-(trifluoromethyl)phenyl, fluoro-(cyano)phenyl, or difluoro-(cyano)phenyl pinacol ester of borate. E2 is the second reactant, where Hal refers to a halogen, which can be I, Br, or Cl, but Br is preferred. The reaction conditions for this palladium-catalyzed coupling reaction are known to those skilled in the art, for example, see WO 2017 / 005699, where it is known that the reactive groups of E1 and E2 can be interchanged as follows to optimize the reaction yield:

[0504]

[0505] In the second step, formula E is obtained through a nucleophilic aromatic substitution reaction of an aryl halogen with a nitrogen heterocycle. BThe aryl halogen is preferably an aryl fluoride or an aryl dihalide, preferably an aryl difluoride, E3. Typical conditions include the use of a base, such as tripotassium phosphate or sodium hydride, in an aprotic polar solvent such as dimethyl sulfoxide (DMSO) or N,N-dimethylformamide (DMF), for example:

[0506]

[0507] Specifically, 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 1-substituted carbazole (e.g., 1-methylcarbazole, 1-phenylcarbazole, 1-tert-butylcarbazole), a 2-substituted carbazole (e.g., 2-methylcarbazole, 2-phenylcarbazole, 2-tert-butylcarbazole), or a 3-substituted carbazole (e.g., 3-methylcarbazole, 3-phenylcarbazole, 3-tert-butylcarbazole). Alternatively, halogen-substituted carbazoles, particularly 3-bromocarbazole, can also be used as E4.

[0508] In subsequent reactions, borate or boric acid functional groups can be introduced at the position of one or more halogen substituents introduced via E4 to generate the corresponding carbazole-3-ylboronic esters or carbazole-3-ylboronic acids, for example, by reaction with bis(pinacol)diboron (CAS No. 73183-34-3). Subsequently, this can be achieved by reaction with the corresponding halogenated reactant (e.g., R...). c -Hal, preferred R c -Cl and R c The coupling reaction of -Br) introduces one or more substituents R. b R c Or R d To replace borate ester groups or boric acid groups.

[0509] Alternatively, it can be combined with substituent R b [R b -B(OH)2]、R c [R c -B(OH)2] or RR d [R d The reaction of boric acid or the corresponding borate ester of [-B(OH)2] introduces one or more substituents R at the position of one or more halogen substituents introduced by DH. b R c Or R d .

[0510] Other TADF emitter materials E can be obtained using methods similar to those described above. B TADF emitter material E B It can also be obtained by any suitable alternative synthetic route as needed.

[0511] Another step in the synthetic route is to introduce a nitrogen heterocycle into an aryl halide or aryl pseudohalide via a copper or palladium-catalyzed coupling reaction, preferably an aryl bromide, aryl iodide, aryl trifluoromethanesulfonate, or aryl toluenesulfonate.

[0512] Small FWHM luminescent body S B

[0513] In the context of this invention, a small half-height full-width (FWHM) emitter S B It is any emitter with an emission spectrum having the following FWHM value, measured at room temperature (i.e., about 20°C) using 1-5% by weight, particularly 1% by weight, of the emitter material in poly(methyl methacrylate) PMMA, with an FWHM value less than or equal to 0.25 eV (≤0.25 eV).

[0514] In a preferred embodiment of the present invention, the small FWHM light emitter S of the present invention B It is any emitter with an emission spectrum having the following FWHM value, measured at room temperature (i.e., about 20°C) using 1-5% by weight, particularly 1% by weight, of the emitter material in poly(methyl methacrylate) PMMA, with an FWHM value ≤0.24 eV, more preferably ≤0.23 eV, even more preferably ≤0.22 eV, ≤0.21 eV, or ≤0.20 eV. In other embodiments of the invention, the at least one small FWHM emitter S B Any one of them has an FWHM value ≤0.19eV, ≤0.18eV, ≤0.17eV, ≤0.16eV, ≤0.15eV, ≤0.14eV, ≤0.13eV, ≤0.12eV, or ≤0.11eV.

[0515] Furthermore, in this invention, the small FWHM light emitter S B It exhibits maximum emission in the wavelength range of 500 nm to 560 nm, and measurements are taken at room temperature with 1-5% by weight, particularly 1% by weight, of the luminescent material in poly(methyl methacrylate) PMMA.

[0516] In a preferred embodiment of the present invention, at least one small FWHM light emitter S BOne or more of them exhibit maximum emission in the wavelength range of 520 nm to 540 nm, measured at room temperature with 1-5% by weight, particularly 1% by weight, of the emitting material in poly(methyl methacrylate) PMMA.

[0517] It should be understood that the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention B Optionally, it is a light emitter having an emission spectrum with an FWHM value less than or equal to 0.25 eV. Optionally, it is a TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B Optionally, it exhibits a maximum emission in the wavelength range of 500 nm to 560 nm. The TADF material E of this invention... B With any small FWHM light emitter S of the present invention B The difference is that E B It is typically used primarily for energy transfer to at least one small FWHM light source S B The energy pump, and the main contribution of the emission band of the optoelectronic device of the present invention is preferably attributed to the at least one small FWHM light emitter S. B The launch.

[0518] In a preferred embodiment of the invention, any small FWHM light emitter S B All are organic light emitters, which in the context of this invention means that they do not contain any transition metals. Preferably, any small FWHM light emitter S of this invention B It is mainly composed of the elements hydrogen (H), carbon (C), nitrogen (N) and boron (B), but may also include, for example, oxygen (O), silicon (Si), fluorine (F) and bromine (Br).

[0519] In a preferred embodiment of the present invention, the small FWHM light emitter S of the present invention B It is a near-range charge transfer (NRCT) luminescent material.

[0520] Hatakeyama et al. described a typical NRCT luminescent material in the literature (Advanced Materials, 2016, 28(14):2777-2781, DOI:10.1002 / adma.201505491), showing the delayed component in the time-resolved photoluminescence spectrum and exhibiting short-range HOMO-LUMO separation.

[0521] A typical NRCT emitter shows only one emission band in its emission spectrum, while a typical fluorescent emitter shows several different emission bands due to vibrational progression.

[0522] According to the present invention, any small FWHM light emitter S contained in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention B It has energy E HOMO (S B The highest occupied molecular orbital (HOMO) of ) B ), wherein the preferred value is: –5.6eV≤E HOMO (S B )≤–5.4eV.

[0523] According to the present invention, any small FWHM light emitter S contained in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention B It has energy E LUMO (S B The lowest unoccupied molecular orbital (LUMO) of ) B ), wherein the preferred value is: –3.1eV≤E LUMO (S B )≤–2.9eV.

[0524] According to the present invention, any small FWHM light emitter S contained in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention B It has the lowest excited singlet state energy level E(S1) S Preferably, 2.4eV ≤ E(S1) S ≤2.6eV.

[0525] According to the present invention, any small FWHM light emitter S contained in any layer of at least one light-emitting layer B of the organic electroluminescent device of the present invention B It has the lowest excited triplet energy level E(T1) S Its preferred range depends on the above-mentioned singlet energy level E(S1). S Preferred range and small FWHM luminescent material S B ΔE ST Preferably, the ΔE ST Less than or equal to 0.5 eV.

[0526] In a preferred embodiment of the present invention, the at least one small FWHM light emitter S B Each of them is a boron (B) luminescent material.

[0527] Known examples of small FWHM luminescent organisms containing boron (B) include structures with a boron-dipyrromethene core, wherein the boron atom is typically further substituted with two fluorine substituents or two alkoxy substituents, in which one or more hydrogen atoms may be substituted for fluorine (F) or the two aryloxy substituents. Specific examples of such luminescent organisms are as follows:

[0528]

[0529] In one embodiment, the at least one small FWHM light emitter S B Each of them includes or is composed of polycyclic aromatic compounds.

[0530] In one embodiment of the present invention, the at least one small FWHM light emitter S B Each of the elements in the formula BI includes (or is composed of) the following structures:

[0531]

[0532] Where B is boron.

[0533] Ar 1 Ar 2 and Ar 3 Each time they appear, they are independently selected from aromatic rings and heteroaromatic rings, and Ar 1 Ar 2 Ar 3 They can be optionally connected to each other to form one or more additional loops.

[0534] Ar of general formula BI 1 Ar 2 Ar 3 Examples of aromatic rings are aromatic rings with 6 to 30 carbon atoms, preferably aromatic rings with 6 to 16 carbon atoms, more preferably aromatic rings with 6 to 12 carbon atoms, and particularly preferably aromatic rings with 6 to 10 carbon atoms.

[0535] Ar of general formula BI 1 Ar 2 Ar 3 Specific examples of aromatic rings include: benzene rings, which are monocyclic systems; biphenyl rings, which are bicyclic systems; naphthalene rings, which are fused bicyclic systems; terphenyl rings (m-terphenyl, o-terphenyl, or para-terphenyl), which are tricyclic systems; acenaphthene, fluorene, benzene, and phenanthrene rings, which are fused tricyclic systems; benzobenzene, pyrene, and benzotetrabenzene rings, which are fused tetracyclic systems; and perylene and benzopentabenzene rings, which are fused pentacyclic systems.

[0536] Ar of general formula BI 1 Ar 2 Ar 3 Examples of heteroaryl rings are heteroaryl rings with 2 to 30 carbon atoms, preferably heteroaryl rings with 2 to 25 carbon atoms, more preferably heteroaryl rings with 2 to 20 carbon atoms, even more preferably heteroaryl rings with 2 to 15 carbon atoms, and particularly preferably heteroaryl rings with 2 to 10 carbon atoms. Furthermore, Ar, as a general formula B-1...1 Ar 2 Ar 3 The heterocyclic ring can be, for example, a heterocycle containing 1 to 5 heteroatoms selected from oxygen, sulfur, and nitrogen in addition to carbon as a cyclic atom.

[0537] Ar of general formula BI 1 Ar 2 Ar 3 Specific examples of heteroaromatic rings include: pyrrole ring, oxazole ring, isoxazole ring, thiazole ring, isothiazole ring, imidazole ring, oxadiazole ring, thiadiazole ring, triazole ring, tetraazole ring, pyrazole ring, pyridine ring, pyrimidine ring, pyrazine ring, pyrazine ring, triazine ring, indole ring, isoyindole ring, 1H-indazole ring, benzimidazole ring, benzoxazole ring, benzothiazole ring, 1H-benzotriazole ring, and quinoline ring. Rings, isoquinoline rings, acridine rings, quinazoline rings, quinoxaline rings, phthalazine rings, naphthidine rings, purine rings, pteridine rings, carbazole rings, acridine rings, phenothiazine rings, phenothiazine rings, phenothiazine rings, phenothiazine rings, indene rings, furan rings, benzofuran rings, isobenzofuran rings, dibenzofuran rings, thiophene rings, benzothiophene rings, dibenzothiophene rings, furan rings, oxadiazole rings, and thiathrone rings.

[0538] Ar of general formula BI 1 Ar 2 Ar 3 One or more hydrogen atoms in the aforementioned aromatic or heteroaromatic rings may be substituted by the group R. f replace,

[0539] Where R f Each time it appears, it is independently selected from: hydrogen, deuterium, N(R) 17 2. OR 17 SR 17 Si(R) 17 3. B(OR) 17 2. OSO2R 17 CF3, CN, halogens

[0540] C1-C 40 -alkyl,

[0541] It is optionally substituent by one or more substituents R 17 Replace, and

[0542] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 17 O, S or CONR 17 ;

[0543] C1-C 40 -alkoxy,

[0544] It is optionally substituent by one or more substituents R 17 Replace, and

[0545] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 17 O, S or CONR 17 ;

[0546] C1-C 40 -Thioalkoxy,

[0547] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 17 O, S or CONR 17 ;

[0548] C2-C 40 -Alkenyl

[0549] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 17 O, S or CONR 17 ;

[0550] C2-C 40 -Alkyne group.

[0551] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 17 O, S or CONR 17 ;

[0552] C6-C 60 -Aryl,

[0553] It is optionally substituent by one or more substituents R 17 Replace; and

[0554] C3-C 57 - heteroaryl

[0555] It is optionally substituent by one or more substituents R 17 replace;

[0556] R 17 Each time it appears, it is independently selected from: hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3.

[0557] C1-C5-alkyl,

[0558] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0559] C1-C5-alkoxy,

[0560] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0561] C1-C5-thioalkoxy,

[0562] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0563] C2-C5-alkenyl,

[0564] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0565] C2-C5-alkynyl group,

[0566] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0567] C6-C 18 -Aryl,

[0568] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0569] C3-C 17 - heteroaryl

[0570] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0571] N(C6-C 18 -Aryl)2,

[0572] N(C3-C 17 -heteroaryl)2; and

[0573] N(C3-C 17 -heteroaryl)(C6-C 18 -Aryl); among which

[0574] Any substituent R f and R 17 It can optionally and independently be with one or more substituents R f R 17 and / or aromatic or hybrid aromatic rings Ar 1 Ar 2 and Ar 3 Formation of monocyclic or polycyclic, aliphatic, aromatic, heteroaromatic and / or benzo[a]fused ring systems, wherein the ring system thus formed may optionally be substituented by one or more substituents R. f replace.

[0575] In one embodiment of the present invention, the at least one small FWHM light emitter S B Each of the terms in S includes (or is composed of) the formula S. B -II,S B -III and S B Any structure in -IV:

[0576]

[0577] in

[0578] For Ar 1 Ar 2 Ar 3 R f and R 17 The definitions described above apply;

[0579] Y2 Y 3 and Y 4 Each time it appears, it is selected independently from:

[0580] NR 18 O, C(R) 18 )2, S or Si(R) 18 )2; of which

[0581] R 18 Each time it appears, it is selected independently from:

[0582] C1-C5 alkyl, optionally with one or more substituents R 19 replace;

[0583] C6-C 60 -aryl, which is optionally substituent by one or more R groups 19 Replace; and

[0584] C3-C 57 - heteroaryl, which is optionally substituent by one or more R groups 19 replace;

[0585] R 19 Each time it appears, it is independently selected from: hydrogen, deuterium, N(R) 20 2. OR 20 SR 20 Si(R) 20 3. B(OR) 20 2. OSO2R 20 CF3, CN, halogen

[0586] C1-C 40 -alkyl,

[0587] It is optionally substituent by one or more substituents R 20 Replace, and

[0588] One or more non-adjacent CH2- groups are optionally R 2 OC = 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, SO2, NR 20 O, S or CONR 20 ;

[0589] C1-C 40 -alkoxy,

[0590] It is optionally substituent by one or more substituents R 20 Replace, and

[0591] One or more non-adjacent CH2- groups are optionally R 2 OC = 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, SO2, NR 20 O, S or CONR 20 ;

[0592] C1-C 40 -Thioalkoxy,

[0593] It is optionally substituent by one or more substituents R 20 Replace, and

[0594] One or more non-adjacent CH2- groups are optionally R 2 OC = 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, SO2, NR 20 O, S or CONR 20 ;

[0595] C2-C 40 -Alkenyl

[0596] It is optionally substituent by one or more substituents R 20 Replace, and

[0597] One or more non-adjacent CH2- groups are optionally R 2 OC = 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, SO2, NR 20 O, S or CONR 20 ;

[0598] C2-C 40 -Alkyne group.

[0599] It is optionally substituent by one or more substituents R 20 Replace, and

[0600] One or more non-adjacent CH2- groups are optionally R 2 OC = 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, SO2, NR 20 O, S or CONR 20 ;

[0601] C6-C 60 -Aryl,

[0602] It is optionally substituent by one or more substituents R 20 Replace; and

[0603] C3-C 57 - heteroaryl

[0604] It is optionally substituent by one or more substituents R 20 replace;

[0605] R 20 Each time it appears, it is independently selected from the following group: hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3.

[0606] C1-C5-alkyl,

[0607] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0608] C1-C5-alkoxy,

[0609] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0610] C1-C5-thioalkoxy,

[0611] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0612] C2-C5-alkenyl,

[0613] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0614] C2-C5-alkynyl group,

[0615] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0616] C6-C 18 -Aryl,

[0617] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0618] C3-C 17 - heteroaryl

[0619] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0620] N(C6-C 18 -Aryl)2,

[0621] N(C3-C 17 -heteroaryl)2; and

[0622] N(C3-C 17 -heteroaryl)(C6-C 18 -Aryl); among which

[0623] Any substituent R f R 17 R 18 and R 19 They can be independently and optionally with one or more substituents R f R 17 R 18 R 19 and / or aromatic rings or heteroaromatic rings Ar 1 Ar 2 and Ar 3 Formation of monocyclic or polycyclic, aliphatic, aromatic, heteroaromatic, and / or benzo[a]fused ring systems, wherein the ring thus formed may optionally be substituented by one or more substituents R. f replace.

[0624] In one embodiment of the present invention, the at least one small FWHM light emitter S B Each of them includes (or consists of) a formula S. B Structure of -III-3a:

[0625]

[0626] Where R VI R VII RVIII R IX R X R XI R XII R XIII R XIV R XV R XV I, R XVII R XVIII R XIX R XX R XXI R XXII and R XXIII Selected independently from: hydrogen, deuterium, N(R) 21 )2,OR 21 ,SR 21 ,Si(R 21 )3,B(OR 21 )2,OSO2R 21 ,CF3,CN,halogen,

[0627] C1-C 40 -alkyl,

[0628] It is optionally substituent by one or more substituents R 21 Replace, and

[0629] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 21 O, S or CONR 21 ;

[0630] C1-C 40 -alkoxy,

[0631] It is optionally substituent by one or more substituents R 21 Replace, and

[0632] One or more non-adjacent CH2- groups are optionally 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)(R21 SO, SO2, NR 21 O, S or CONR 21 ;

[0633] C1-C 40 -Thioalkoxy,

[0634] It is optionally substituent by one or more substituents R 21 Replace, and

[0635] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 21 O, S or CONR 21 ;

[0636] C2-C 40 -Alkenyl

[0637] It is optionally substituent by one or more substituents R 21 Replace, and

[0638] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 21 O, S or CONR 21 ;

[0639] C2-C 40 -Alkyne group.

[0640] It is optionally substituent by one or more substituents R 21 Replace, and

[0641] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 21 O, S or CONR 21 ;

[0642] C6-C 60 -Aryl,

[0643] It is optionally substituent by one or more substituents R 21 Replace; and

[0644] C3-C 57 - heteroaryl

[0645] It is optionally substituent by one or more substituents R 21 replace;

[0646] Among them, one or more pairs of adjacent groups R can be selected. VI and R VII R VII and R VIII R VIII and R IX R X and R XI R X I and R XII R XII and R XIII R XIV and R XV R XV and R XVI R XV I and R XVII R XVII and R XVIII R XIX R XX R XX and R XXI R XXI and R XXII R XXII and R XXIII It forms an aromatic ring system and fuses with adjacent general formula S. B -III-3a is attached to benzene ring a, b, c, or d, and optionally to one or more substituents R. 21 replace;

[0647] Among them, R can be chosen. VI and R XXIII R XIII and R XIV One or two pairs are linked to form the group Z. 4 Each time it appears, it is selected independently from: direct key, CR 22R 23 C = CR 22 R 23 C=O, C=NR 22 NR 22 O, SiR 22 R 23 S, S(O) and S(O)2;

[0648] R 21 Each time it appears, it is independently selected from: hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3.

[0649] C1-C5-alkyl,

[0650] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0651] C1-C5-alkoxy,

[0652] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0653] C1-C5-thioalkoxy,

[0654] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0655] C2-C5-alkenyl,

[0656] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0657] C2-C5-alkynyl group,

[0658] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0659] C6-C 18 -Aryl,

[0660] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0661] C3-C 17 - heteroaryl

[0662] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0663] N(C6-C 18 Aryl)2,

[0664] N(C3-C 17 -heteroaryl)2; and

[0665] N(C3-C 17 -heteroaryl)(C6-C 18 -aryl);

[0666] R 22 and R 23 Each time it appears, it is independently selected from: hydrogen, deuterium, N(R) 24 2. OR 24 Si(R) 24 3. B(OR) 24 2. OSO2R 24 CF3, CN, F, Br, I

[0667] C1-C 40 -alkyl,

[0668] It is optionally substituent by one or more substituents R 24 Replace, and

[0669] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 24 O, S or CONR 24 ;

[0670] C1-C 40 -alkoxy,

[0671] It is optionally substituent by one or more substituents R 24 Replace, and

[0672] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 24 O, S or CONR 24 ;

[0673] C1-C 40 -Thioalkoxy,

[0674] It is optionally substituent by one or more substituents R 24 Replace, and

[0675] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 24 O, S or CONR 24 ;

[0676] C2-C 40 -Alkenyl

[0677] It is optionally substituent by one or more substituents R 24 Replace, and

[0678] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 24 O, S or CONR 24 ;

[0679] C2-C 40 -Alkyne group.

[0680] It is optionally substituent by one or more substituents R 24 Replace, and

[0681] One or more non-adjacent CH2- groups are optionally 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, SO2, NR 24 O, S or CONR 24 ;

[0682] C6-C 60 -Aryl,

[0683] It is optionally substituent by one or more substituents R 24 Replace; and

[0684] C3-C 57 - heteroaryl

[0685] It is optionally substituent by one or more substituents R 24 replace;

[0686] R 24 Each time it appears, it is independently selected from: hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(C1-C5-alkyl)3, Si(Ph)3.

[0687] C1-C5-alkyl,

[0688] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0689] C1-C5-alkoxy,

[0690] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0691] C1-C5-thioalkoxy,

[0692] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0693] C2-C5-alkenyl,

[0694] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0695] C2-C5-alkynyl group,

[0696] Optionally, one or more hydrogen atoms are independently substituted by deuterium, CN, CF3, or F;

[0697] C6-C 18 -Aryl,

[0698] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0699] C3-C 17 - heteroaryl

[0700] It may optionally be substituted with one or more C1-C5-alkyl substituents;

[0701] N(C6-C 18-Aryl)2,

[0702] N(C3-C 17 -heteroaryl)2; and

[0703] N(C3-C 17 -heteroaryl)(C6-C 18 -aryl);

[0704] R A Choose from the following groups: hydrogen,

[0705] C3-C 15 - Heteroaryl, wherein optionally one or more hydrogen atoms are independently surrounded by deuterium, halogen, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), C3-C 15 - Heteroaryl substitution, and C6-C 18 -aryl, wherein one or more hydrogen atoms are optionally substituted independently of each other by C1-C5-alkyl, CN, CF3 and Ph;

[0706] and

[0707] C6-C 18 -aryl, wherein one or more hydrogen atoms are optionally substituted independently of each other by substituents selected from: C1-C5-alkyl, CN, CF3 and

[0708] Ph, which is optionally selected independently of Me, i Pr, t Substitution of Bu, CN, CF3 and Ph substituents

[0709] Pyridyl group, which is optionally selected independently of one or more M, i Pr, t Substituent substitutions in the group consisting of Bu, CN, CF3, and Ph

[0710] Pyrimidinyl group, which may optionally be selected independently of one or more of Me, i Pr, t Substituents of Bu, CN, CF3 and Ph, and

[0711] Triazine group, which may optionally be selected independently of one or more of Me, i Pr, t Substituents of Bu, CN, CF3 and Ph.

[0712] In a highly preferred embodiment of the invention, R A Selected from:

[0713] C3-C 15- Heteroaryl, wherein optionally one or more hydrogen atoms are independently surrounded by deuterium, halogen, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), C3-C 15 - Heteroaryl substitution, and

[0714] C6-C 18 -aryl, wherein one or more hydrogen atoms are optionally substituted independently of each other by C1-C5-alkyl, CN, CF3 and Ph;

[0715] In a particularly preferred embodiment of the invention, R A Selected from:

[0716] C3-C 15 - Heteroaryl, wherein optionally one or more hydrogen atoms are independently surrounded by deuterium, halogen, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), C3-C 15 - Heteroaryl substitution, and

[0717] C6-C 18 -aryl, wherein one or more hydrogen atoms are optionally substituted independently of each other by C1-C5-alkyl, CN, CF3, and Ph.

[0718] Where according to formula S B -III-3a of R A The binding site is C3-C 15 -C3-C of heteroaryl groups 15 - One of the carbon atoms.

[0719] In one embodiment of the present invention, the at least one small FWHM light emitter S B Each of them contains (or consists of) 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-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,SB -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 Any structure in -III-3a-30:

[0720]

[0721]

[0722]

[0723]

[0724] In a preferred embodiment of the present invention, the at least one small FWHM light emitter S B Each of them contains (or consists of) 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 Any structure in -III-3a-10:

[0725]

[0726] In a preferred embodiment of the present invention, the at least one small FWHM light emitter S B Each of the terms in S includes (or is composed of) the formula 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 The structure of any one of -III-3a-30, where R A It is hydrogen or has the following properties: 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 AThe structure represented by any one of -XIII

[0727]

[0728]

[0729] in

[0730] Dashed lines indicate binding sites with the core structure;

[0731] Q 5 Each time it appears, it is independently selected from nitrogen (N) and R. 25 ;

[0732] X 3 Each time it appears, it is independently selected from oxygen (O), sulfur (S), and C (R). 25 )2 and NR 25 ;

[0733] R 25 Each time it appears, it is independently selected from: hydrogen, deuterium, halogen, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), and

[0734] C6-C 18 -aryl, which may optionally be composed of one or more groups independently selected from C1-C5-alkyl, CN, CF3, C6-C 18 -Aryl and C3-C 15 - Substituent substitution of heteroaryl groups;

[0735] C3-C 15 - Heteroaryl group, which is optionally composed of one or more groups independently selected from C1-C5-alkyl, CN, CF3, C6-C 18 -Aryl and C3-C 15 - Substituent substitution of heteroaryl groups;

[0736] R 26 Each time it appears, it is independently selected from: hydrogen, deuterium, halogen, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), and

[0737] C6-C 18 -aryl, which may optionally be composed of one or more groups independently selected from C1-C5-alkyl, CN, CF3, C6-C 18 -Aryl and C3-C 15 - Substituent substitution of heteroaryl groups;

[0738] C3-C 15- Heteroaryl group, which is optionally composed of one or more groups independently selected from C1-C5-alkyl, CN, CF3, C6-C 18 -Aryl and C3-C 15 - Substituent substitution of heteroaryl groups;

[0739] Two or more adjacent substituents R 25 and / or R 26 C3-C can be formed arbitrarily. 30 -Aromatic rings or C3-C 15 -A mixed aromatic ring system; and

[0740] Where in equation R A -III, R A -IV, R A -V and R A In -VI, at least one Q 5 It is N; and

[0741] Where in equation R A -III, R A -IV, R A -V and R A In -VI, two adjacent groups Q 5 Not all of them are N.

[0742] In an even more preferred embodiment of the present invention, the at least one small FWHM light emitter S B Each of them includes (or consists of) the formula 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、SB -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 Any structure in -III-3a-30, where R A It is hydrogen or has the 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 The structure represented by any of -XIII; and

[0743] Where R 26 It is hydrogen each time it appears.

[0744] In yet another preferred embodiment of the invention, the at least one small FWHM light emitter S B Each of the terms in S includes (or is composed of) the formula 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, SB -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 Any structure in -III-3a-30, where R A It is hydrogen or has the 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, RA -VIIIb, R A -VIIIc, R A -IXa、R A -IXb and R A Any structure represented by -IXc:

[0745]

[0746]

[0747]

[0748] The dashed lines represent the binding sites with the core structure;

[0749] R 25 Each time it appears, it is independently selected from: hydrogen, deuterium, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), and

[0750] C6-C 18 -aryl, which may optionally be composed of one or more groups independently selected from C1-C5-alkyl, CN, CF3, C6-C 18 -Aryl and C3-C 15 - Substituent substitution of heteroaryl groups;

[0751] C3-C 15 - Heteroaryl group, which is optionally composed of one or more groups independently selected from C1-C5-alkyl, CN, CF3, C6-C 18 -Aryl and C3-C 15 -Substituents of heteroaryl groups; and wherein

[0752] Adjacent group R 25 They do not combine to form any type of additional ring system.

[0753] In one or even a more preferred embodiment of the invention, R 25 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), and

[0754] C6-C 18 -Aryl, which is optionally composed of one or more compounds independently selected from Me, i Pr, t Substituents of Bu, CN, CF3 and Ph;

[0755] C3-C 15- A heteroaryl group, optionally substituted by one or more substituents independently selected from the group consisting of: Me, i Pr, t Bu, CN, CF3, C6-C 18 -Aryl and Ph; and in which

[0756] Adjacent group R 25 They do not combine to form any type of additional ring system.

[0757] In one or even a more preferred embodiment of the invention, R 25 Each time it appears, it is selected independently from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), and

[0758] Ph, which is optionally substituted by one or more substituents selected independently from the group consisting of: Me, i Pr, t Bu, CN, CF3, and Ph; and among them

[0759] Adjacent group R 25 They do not combine to form any type of additional ring system.

[0760] In one implementation, 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 They are independently selected from: hydrogen, halogens, CN, CF3, SiMe3, SiPh3,

[0761] C1-C5-alkyl,

[0762] One or more hydrogen atoms may be optionally replaced by deuterium;

[0763] C6-C 18 -Aryl,

[0764] Optionally, one or more hydrogen atoms are independently bounded by C1-C5-alkyl, C6-C... 18-Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution;

[0765] C3-C 15 - heteroaryl

[0766] Optionally, one or more hydrogen atoms are independently bounded by C1-C5-alkyl, C6-C... 18 -Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution; and

[0767] N(Ph)2;

[0768] Wherein, R VI and R VII R VII and R VIII R VIII and R IX At least one pair of adjacent groups in the aromatic ring system fused to formula S B -III-3a of the adjacent benzene ring a, and / or optionally, R X and R X I, R X I and R X II, R X II and R XIII At least one pair of adjacent groups in the aromatic ring system forms an aromatic ring system, which is consistent with formula S. B -III-3a adjacent benzene ring b fusion;

[0769] Each of these optionally formed aromatic ring systems contains 3 to 30 carbon atoms and is optionally substituent by one or more R groups. 21 Replace; and

[0770] Particularly preferably, the two aromatic ring systems thus optionally formed are identical; and

[0771] Wherein, R VI and R XXIII R XIII and R XIV One or two pairs of elements are linked to form the group Z. 4 Each time it appears, it is selected independently from: direct key, CR 22 R 23 C = CR 22 R 23 C=O, C=NR 22 NR 22 O, SiR 22 R 23 S, S(O) and S(O)2;

[0772] Where R21 R 22 and R 23 Each time it appears, it is independently selected from: hydrogen, deuterium, halogen, CN, CF3, SiMe3, SiPh3.

[0773] C1-C5-alkyl,

[0774] One or more hydrogen atoms may be optionally replaced by deuterium;

[0775] C6-C 18 -Aryl,

[0776] Optionally, one or more hydrogen atoms are independently bounded by C1-C5-alkyl, C6-C... 18 -Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution;

[0777] C3-C 15 - heteroaryl

[0778] Optionally, one or more hydrogen atoms are independently bounded by C1-C5-alkyl, C6-C... 18 -Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution; and

[0779] N(Ph)2.

[0780] In a more preferred embodiment of the present invention, at least one small FWHM light emitter S B Each of the terms in S includes (or is composed of) the formula 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 Any structure in -III-3a-10;

[0781] Where R VI R VII R VIII R IX R X R X I, R XII R XIII R XIV R XV R XVI RXVII R XVIII R XIX R XX R XXI R XXII and R XXIII Each element is independently selected from: hydrogen, deuterium, halogens, CN, CF3, SiMe3, SiPh3.

[0782] C1-C5-alkyl,

[0783] One or more hydrogen atoms may be optionally replaced by deuterium;

[0784] C6-C 18 -aryl, wherein optionally one or more hydrogen atoms are independently surrounded by C1-C5-alkyl, C6-C 18 -Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution;

[0785] C3-C 15 - Heteroaryl, wherein optionally one or more hydrogen atoms are independently surrounded by C1-C5-alkyl, C6-C 18 -Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution; and

[0786] N(Ph)2;

[0787] Optionally, at least one pair of adjacent groups R VI and R VII R VII and R VIII R VIII and R IX Aromatic ring systems are formed, which fuse to formula S B -III-3a of the adjacent benzene ring a, and / or optionally, at least one pair of adjacent groups R X and R XI R XI and R XII R XII and R XIII It forms an aromatic ring system, which is related to the general formula S B -III-3a adjacent benzene ring b fusion;

[0788] Each of these optionally formed aromatic ring systems contains 3 to 30 carbon atoms and is optionally substituent by one or more R groups. 21 Replace; and

[0789] Particularly preferably, the two aromatic ring systems thus optionally formed are identical; and

[0790] Wherein, R VI and RXXIII R XIII and R XIV One or two pairs are linked to form the group Z. 4 Each time it appears, it is selected independently from: direct key, CR 22 R 23 C = CR 22 R 23 C=O, C=NR 22 NR 22 O, SiR 22 R 23 S, S(O) and S(O)2;

[0791] Where R 21 R 22 and R 23 Each time it appears, it is independently selected from: hydrogen, deuterium, halogen, CN, CF3, SiMe3, SiPh3.

[0792] C1-C5-alkyl,

[0793] One or more hydrogen atoms may be optionally replaced by deuterium;

[0794] C6-C 18 -aryl, wherein optionally one or more hydrogen atoms are independently surrounded by C1-C5-alkyl, C6-C 18 -Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution;

[0795] C3-C 15 - Heteroaryl, wherein optionally one or more hydrogen atoms are independently surrounded by C1-C5-alkyl, C6-C 18 -Aryl, C3-C 17 -Heteroaryl, CN or CF3 substitution; and

[0796] N(Ph)2.

[0797] In an even more preferred embodiment of the present invention, the at least one small FWHM light emitter S B Each of them includes (or consists of) the formula 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 BAny structure in -III-3a-10;

[0798] Where 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 Each element is independently selected from: hydrogen, deuterium, CN, CF3, SiMe3, SiPh3, N(Ph)2.

[0799] C1-C5-alkyl,

[0800] One or more hydrogen atoms may be optionally replaced by deuterium;

[0801] C6-C 18 -Aryl,

[0802] In which one or more hydrogen atoms are optionally independently controlled by Me, i Pr, t Replace with Bu, CN, CF3 or Ph;

[0803] C3-C 15 - heteroaryl

[0804] In which one or more hydrogen atoms are optionally independently controlled by Me, i Pr, t Bu, CN, CF3, or Ph substitution; and wherein, optionally, at least one pair of adjacent groups R VI and R VII R VII and R VIII R VIII and R IX Forming an aromatic ring system and fused to formula S B -III-3a of the adjacent benzene ring a, and / or optionally, at least one pair of adjacent groups R X and R XI R XI and R XII R XII and R XIII Forming an aromatic ring system and reacting with the general formula S B -III-3a adjacent benzene ring b fusion;

[0805] Each of these optionally formed aromatic ring systems contains 3 to 30 carbon atoms; and

[0806] Particularly preferably, the two aromatic ring systems thus optionally formed are identical; and

[0807] Wherein, R VI and R XXIII R XIII and R XIV One or two pairs of elements are linked to form the group Z. 4 Each time it appears, it is selected independently from: direct key, CR 22 R 23 C = CR 22 R 23 C=O, C=NR 22 NR 22 O, SiR 22 R 23 S, S(O) and S(O)2;

[0808] Where R 22 and R 23 Each time it appears, it is independently selected from: hydrogen, deuterium, CN, CF3, SiMe3, SiPh3, C1-C5-alkyl.

[0809] One or more hydrogen atoms may be optionally replaced by deuterium;

[0810] C6-C 18 -Aryl,

[0811] In which one or more hydrogen atoms are optionally independently controlled by Me, i Pr, t Replace with Bu, CN, CF3 or Ph;

[0812] C3-C 15 - heteroaryl

[0813] One or more hydrogen atoms can be independently controlled by Me, i Pr, t Bu, CN, CF3, or Ph can be substituted.

[0814] 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 XVR XVI R XVII R XVIII R XIX R XX R XXI R XXII and R XXIII Choose independently from the following groups: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, N(Ph)2 and

[0815] Ph, in which one or more hydrogen atoms are optionally replaced by deuterium, Me, i Pr, t Bu, CN, and CF3 replace; and

[0816] Choose any one or two pairs of R. VI and R XXIII R XIII and R XIV Linkage to form group Z 4 It is a direct key each time it appears.

[0817] In a particularly preferred embodiment of the invention, the at least one small FWHM light emitter S B Each of them includes (or consists of) the formula 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 Any structure in -III-3a-10;

[0818] Where 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 RXXIII Each is independently selected from: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, N(Ph)2 and

[0819] Ph, in which one or more hydrogen atoms are optionally replaced by deuterium, Me, i Pr, t Bu, CN, and CF3 replace; and

[0820] Choose any one or two pairs of R. VI and R XXIII R XIII and R XIV Linkage to form group Z 4 It is a direct key each time it appears.

[0821] The following will list the small FWHM light emitters S of the organic electroluminescent device of the present invention. B Examples are provided. Of course, the present invention is not limited to devices containing one of these luminescent molecules.

[0822] Formula S B -III-3a-1 Small FWHM luminescent material S B Example:

[0823]

[0824] Formula S B -III-3a-2 Small FWHM luminescent material S B Example:

[0825]

[0826]

[0827] Formula S B -III-3a-3、S B -III-3a-4、S B -III-3a-5 and S B -III-3a-6 Small FWHM luminescent material S B Example:

[0828]

[0829] Formula S B -III-3a-9 Small FWHM luminescent body S B Example:

[0830]

[0831] Small FWHM luminescent body SB The synthesis can be carried out using standard reactions and reaction conditions known to those skilled in the art. (Including formula S) B -III-3a structure or small FWHM luminescent material composed of it S B A typical reaction scheme is described below, where R 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 :

[0832]

[0833] 1,3-Dibromo-2,5-dichlorobenzene (CAS: 81067-41-6, 1.00 equivalent), E1 (2.20 equivalent), tris(dibenzylacetone)dipalladium Pd2(dba)3 (0.02 equivalent; CAS: 51364-51-3), tri-tert-butylphosphine (P( t Bu)3, CAS: 13716-12-6, 0.08 equivalent) and sodium tert-butoxide (NaO) t Bu (6.00 equivalents) was stirred in toluene at 80°C for 2 hours under a nitrogen atmosphere. After cooling to room temperature (rt), the reaction mixture was extracted with toluene and brine, and the phases were separated. The organic layers were combined, dried over MgSO4, and then the solvent was removed under reduced pressure. The crude product was purified by recrystallization or column chromatography to give solid I1.

[0834]

[0835] I1 (1.00 equivalent), E2 (2.20 equivalent), tris(dibenzylacetone)dipalladium Pd2(dba)3 (0.02 equivalent; CAS: 51364-51-3), tri-tert-butylphosphine (0.08 equivalent, P( t Bu)3, CAS: 13716-12-6) and sodium tert-butoxide (NaO) tBu (5.00 equivalents) was stirred in toluene at 100°C for 5 hours under a nitrogen atmosphere. After cooling to room temperature (rt), the reaction mixture was extracted with toluene and brine, and the phases were separated. The organic layers were combined, dried over MgSO4, and then the solvent was removed under reduced pressure. The crude product was purified by recrystallization or column chromatography to give I2 in solid form.

[0836]

[0837] I₂ (1 equivalent) was dissolved in THF under a nitrogen atmosphere and cooled to -20°C, or in tert-butylbenzene and cooled to -10°C, and then added. t BuLi (2 equivalents, CAS: 594-19-4) was used to stir the reaction mixture at 0 °C. After complete lithiation, the reaction was quenched and 1,3,2-dioxoboronane (2 equivalents, CAS: 61676-62-8) was added. The reaction mixture was then stirred at 70 °C under reflux for 2 hours. After cooling to room temperature (rt), the reaction mixture was extracted with toluene and brine, and the phases were separated. The organic layers were combined, dried over MgSO4, and the solvent was removed under reduced pressure. The crude product was purified by recrystallization or column chromatography to obtain I3 in solid form.

[0838]

[0839] I3 (1 equivalent), N,N-diisopropylethylamine (10 equivalents, CAS: 7087-68-5), and AlCl3 (10 equivalents, CAS: 7446-70-0) were stirred in chlorobenzene at 120 °C for 16 h under a nitrogen atmosphere. After cooling to room temperature (rt), the reaction mixture was extracted with toluene and brine, and the phases were separated. The combined organic layers were dried over MgSO4, and the solvent was removed under reduced pressure. The crude product was purified by recrystallization or column chromatography to obtain I4 in solid form.

[0840]

[0841] I4 (1 equivalent), E3 (1.1 equivalent), palladium(II) acetate (CAS: 3375-31-3, 0.1 equivalent), S-Phos (CAS: 657408-07-6, 0.24 equivalent), and tripotassium phosphate (5 equivalent) were stirred at 100 °C for 16 hours under a nitrogen atmosphere in a dioxane / water ratio of 5:1. After cooling to room temperature (rt), the reaction mixture was extracted with toluene and brine, and the phases were separated. The organic layers were combined, dried over MgSO4, and the solvent was removed under reduced pressure. The crude product was purified by recrystallization or column chromatography to give solid P1.

[0842] Other FWHM luminescent materials S can be obtained using similar methods. B FWHM luminescent material S BAlternatively, it can be obtained by using any suitable alternative synthetic route as needed.

[0843] In a preferred embodiment of the invention, each TADF material E contained in the at least one light-emitting layer B B Having E B -I structure, and each FWHM emitter S contained in the at least one light-emitting layer B B Having the formula S B -I structure.

[0844] In an even more preferred embodiment of the invention, each TADF material E contained in the at least one light-emitting layer B B Having 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 Any structure in -I-8, and including each FWHM emitting element S in the at least one emitting layer B. B Having the formula S B -II,S B -III and S B Any structure in -IV.

[0845] In one or even a more preferred embodiment of the invention, each TADF material E contained in the at least one light-emitting layer B B Having 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 Any structure in -I-8, and including each FWHM emitting element S in the at least one emitting layer B. B Having the formula S B -III-3a structure.

[0846] In yet another preferred embodiment of the invention, each TADF material E contained in the at least one light-emitting layer B B Having E B -I-1a-1、E B -I-2a-1、E B -I-3a-1、EB -I-4a-1、E B -I-5a-1、E B -I-6a-1、E B -I-7 and E B Any structure in -I-8, and including each FWHM emitting element S in the at least one emitting layer B. B Having the formula S B -III-3a structure.

[0847] In one or even a more preferred embodiment of the invention, each TADF material E contained in the at least one light-emitting layer B B Having E B -I-3a-1a、E B -I-3a-1b、E B -I-5a-1a and E B Any of the structures in -I-6a-1a, and including each FWHM emitter S in the at least one light-emitting layer B. B Having 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 Any structure in -III-3a-10.

[0848] In a particularly preferred embodiment of the invention, each TADF material E contained in the at least one light-emitting layer B B Having E B -I-3a-1a、E B -I-3a-1b、E B -I-5a-1a and E B Any structure in -I-6a-1a, and each FWHM emitter S contained in the at least one light-emitting layer B B Having 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 SB Any structure in -III-3a-10.

[0849] In a particularly preferred embodiment of the invention, each TADF material E contained in the at least one light-emitting layer B B Each FWHM emitter S having a structure according to any particularly preferred example shown herein, and contained in the at least one light-emitting layer B B It has a structure according to any particularly preferred example shown herein. Relationship between HOMO and LUMO levels of the components within luminescent layer B.

[0850] In a preferred embodiment of the present invention, as long as at least one p-type host HP is present in the light-emitting layer B, one or more or all of the relationships represented by the following formulas (20) to (22) are preferably satisfied: E LUMO (H P E LUMO (E B (20)

[0851] E HOMO (H P )≤E HOMO (S B ) (twenty one)

[0852] E LUMO (H P E LUMO (S B ) (twenty two).

[0853] In a preferred embodiment of the present invention, as long as at least one p-type host HP and at least one n-type host HN are present in the light-emitting layer B, one or more of the relationships represented by the following formulas (18) to (22) are preferably satisfied:

[0854] E HOMO (H P E HOMO (H N (18)

[0855] E LUMO (H P E LUMO (H N (19)

[0856] E LUMO (H P E LUMO (E B (20)

[0857] E HOMO (HP )≤E HOMO (S B ) (twenty one)

[0858] E LUMO (H P E LUMO (S B ) (twenty two).

[0859] In a preferred embodiment of the present invention, as long as at least one p-body HP, at least one n-body HN, and at least one bipolar body HBP are present in the luminescent layer B, one or more of the relationships represented by the following equations (18) to (23) are preferably satisfied:

[0860] E HOMO (H P E HOMO (H N (18)

[0861] E LUMO (H P E LUMO (H N (19)

[0862] E LUMO (H P E LUMO (E B (20)

[0863] E HOMO (H P )≤E HOMO (S B ) (twenty one)

[0864] E LUMO (H P E LUMO (S B ) (twenty two)

[0865] E LUMO (H P E LUMO (H BP ) (twenty three).

[0866] Therefore, the p-body H is optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. P Having the highest occupied molecular orbital HOMO(H) P Its energy E HOMO (H P Preferably, it is higher than the n-body H optionally contained in the at least one light-emitting layer B. NThe highest occupied molecular orbital HOMO (H N Energy E HOMO (H N ).

[0867] Furthermore, the p-body H is optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. P Having the lowest unoccupied molecular orbital LUMO(H) P Its energy E LUMO (H P Preferably, it is higher than the n-body H optionally contained in the at least one light-emitting layer B. N The lowest unoccupied molecular orbital LUMO (H N Energy E LUMO (H N ).

[0868] Furthermore, the p-body H is optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. P It has the lowest unoccupied molecular orbital LUMO(H) P Its energy E LUMO (H P Preferably, the TADF material E contained in the at least one light-emitting layer B is higher than that contained in the TADF material. B The lowest unoccupied molecular orbital LUMO (E B Energy E LUMO (E B ).

[0869] Optionally, the p-body H is optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. P Having the highest occupied molecular orbital HOMO(H) P Its energy E HOMO (H P Preferably, the size of the small FWHM emitter S contained in the at least one light-emitting layer B is lower than or equal to that of the small FWHM emitter S. B The highest occupied molecular orbital HOMO (S B Energy E HOMO (S B ).

[0870] Furthermore, optionally, the p-body H is included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. P Having the lowest unoccupied molecular orbital LUMO(H) P Its energy E LUMO (H P Preferably, it is higher than the small FWHM emitter S contained in the at least one light-emitting layer B. B The lowest unoccupied molecular orbital LUMO (S BEnergy E LUMO (S B Furthermore, optionally, the p-body H is included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. P It has the lowest unoccupied molecular orbital LUMO(H) P Its energy E LUMO (H P Preferably, it is higher than the bipolar body H contained in the at least one light-emitting layer B. BP The lowest unoccupied molecular orbital LUMO (H BP Energy E LUMO (H BP ).

[0871] In a preferred embodiment of the present invention, as long as the light-emitting layer E B There exists a p-type entity H P Preferably, it satisfies one or all of the relations represented by the following equations (26) and / or (27):

[0872] –0.3eV≤E HOMO (H P )–E HOMO (E B )≤0.3eV (26)

[0873] E LUMO (H P )–E LUMO (E B )≥0.3eV (27)

[0874] In a preferred embodiment of the invention, as long as the p-body H P and n-body H N Existing in the luminescent layer E B In the meantime, it is preferable to satisfy one, more or all of the relations represented by the following equations (24) to (27):

[0875] E HOMO (H P )–E HOMO (H N )≥0.3eV (24)

[0876] E LUMO (H P )–E LUMO (H N )≥0.3eV (25)

[0877] –0.3eV≤E HOMO (H P )–E HOMO (E B)≤0.3eV (26)

[0878] E LUMO (H P )–E LUMO (E B )≥0.3eV (27)

[0879] In a preferred embodiment of the invention, as long as the p-body H P and n-body H N and bipolar body H BP All exist in the luminescent layer E B In the meantime, it is preferable to satisfy one, more or all of the relations represented by the following equations (24) to (28):

[0880] E HOMO (H P )–E HOMO (H N )≥0.3eV (24)

[0881] E LUMO (H P )–E LUMO (H N )≥0.3eV (25)

[0882] –0.3eV≤E HOMO (H P )–E HOMO (E B )≤0.3eV(26)

[0883] E LUMO (H P )–E LUMO (E B )≥0.3eV (27)

[0884] E LUMO (H P )–E LUMO (HBP)≥0.3eV (28)

[0885] Therefore, in a preferred embodiment of the invention, the p-body H optionally contained in the at least one light-emitting layer B P Having the highest occupied molecular orbital HOMO(H) P Its energy is E. HOMO (H P Optionally included in the at least one light-emitting layer B, the n-body H N It has energy E HOMO (H N The highest occupied molecular orbital (HOMO) of H N), wherein preferably: E HOMO (H P )–E HOMO (H N ≥0.3 eV. That is, E HOMO (H P ) and E HOMO (H N The energy difference is preferably above 0.3 eV.

[0886] In a preferred embodiment of the invention, the p-body H optionally contained in the at least one light-emitting layer B P Having the lowest unoccupied molecular orbital LUMO(H) P Its energy is E. LUMO (H P Optionally included in the at least one light-emitting layer B, the n-body H N It has energy E LUMO (H N The lowest unoccupied molecular orbital LUMO (H) N ), wherein preferably: E LUMO (H P )–E LUMO (H N ≥0.3 eV. That is, E LUMO (H P ) and E LUMO (H N The energy difference is preferably above 0.3 eV.

[0887] In a preferred embodiment of the invention, the p-body H optionally contained in the at least one light-emitting layer B P Having the highest occupied molecular orbital HOMO(H) P Its energy is E. HOMO (H P ). The TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention B It has energy E HOMO (E B The highest occupied molecular orbital (HOMO) of ) B Preferably, –0.3eV ≤ E HOMO (H P )–E HOMO (E B )≤0.3eV. In other words, the HOMO(H) of the p-body HP contained in the at least one luminescent layer B. P The energy can be higher or lower than that of the TADF emitter E contained in the at least one light-emitting layer B. B HOMO (E BThe energy of the two is preferably no more than 0.3 eV.

[0888] In a preferred embodiment of the invention, the p-body H optionally contained in at least one light-emitting layer B of the organic electroluminescent device of the invention... P Having the lowest unoccupied molecular orbital LUMO(H) P It has an energy of E. LUMO (H P ), and the TADF material E contained in the at least one light-emitting layer B B It has 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. That is, E LUMO (H P ) and E LUMO (E B The energy difference is preferably above 0.3 eV.

[0889] In a preferred embodiment of the invention, the p-body H optionally contained in at least one light-emitting layer B of the organic electroluminescent device of the invention... P Having the lowest unoccupied molecular orbital LUMO(H) P It has an energy of E. LUMO (H P ), and the bipolar body H contained in the at least one light-emitting layer B BP It has energy E LUMO (H BP The lowest unoccupied molecular orbital LUMO (H) BP ), wherein preferably: E LUMO (H P )–

[0890] E LUMO (H BP ≥0.3 eV. That is, E LUMO (H P ) and E LUMO The energy difference of (HBP) is preferably above 0.3 eV.

[0891] In a preferred embodiment of the present invention, as long as the light-emitting layer E B There exists an n-type entity H N Preferably, it satisfies one, more, or all of the relations represented by the following equations (29) to (32):

[0892] EHOMO (H N )≤E HOMO (E B (29)

[0893] E LUMO (H N )≤E LUMO (E B (30)

[0894] E HOMO (H N ) <E HOMO (S B (31)

[0895] E LUMO (H N ) <E LUMO (S B (32)

[0896] In a preferred embodiment of the present invention, as long as the light-emitting layer E B There exists an n-type entity H N and bipolar body H BP Preferably, it satisfies one, more, or all of the relations represented by the following equations (29) to (33):

[0897] E HOMO (H N )≤E HOMO (E B (29)

[0898] E LUMO (H N )≤E LUMO (E B (30)

[0899] E HOMO (H N ) <E HOMO (S B (31)

[0900] E LUMO (H N ) <E LUMO (S B (32)

[0901] E HOMO (H N ) <E HOMO (HBP) (33)

[0902] Therefore, the n-body H optionally contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention NHaving the highest occupied molecular orbital HOMO(H) N Its energy E HOMO (H N Preferably, the amount of TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention is lower than or equal to that in the present invention. B The highest occupied molecular orbital HOMO (E B Energy E HOMO (E B ).

[0903] Furthermore, the n-body H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention N Having the lowest unoccupied molecular orbital LUMO(H) N Its energy E LUMO (H N Preferably, the amount of TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention is equal to or lower than that in the present invention. B The lowest unoccupied molecular orbital LUMO (E B Energy E LUMO (E B ).

[0904] Furthermore, the n-body H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention N Having the highest occupied molecular orbital HOMO(H) N Its energy E HOMO (H N Preferably, the small FWHM emitter S is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B The highest occupied molecular orbital HOMO (S B Energy E HOMO (S B ).

[0905] The n-body H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention N Having the lowest unoccupied molecular orbital LUMO(H) N Its energy E LUMO (H N Preferably, the small FWHM emitter S is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B The lowest unoccupied molecular orbital LUMO (S B Energy E LUMO (S B ).

[0906] Furthermore, the n-body H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention N Having the highest occupied molecular orbital HOMO(H) N Its energy E HOMO (H N Preferably, the bipolar host H is lower than that optionally contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. BP The highest occupied molecular orbital HOMO (H BP Energy E HOMO (H BP ).

[0907] In a preferred embodiment of the present invention, as long as the light-emitting layer E B There exists an n-type entity H N Preferably, it satisfies one, more, or all of the relations represented by the following equations (34) to (36):

[0908] E HOMO (E B )–E HOMO (H N )≥0.3eV (34)

[0909] E LUMO (E B )–E LUMO (H N )≥0.2eV (35)

[0910] E LUMO (S B )–E LUMO (H N )≥0.2eV (36)

[0911] In a preferred embodiment of the present invention, as long as the light-emitting layer E B There exists an n-type entity H N and bipolar body H BP Preferably, it satisfies one, more, or all of the relations represented by the following equations (34) to (37):

[0912] E HOMO (E B )–E HOMO (H N )≥0.3eV (34)

[0913] E LUMO (E B )–E LUMO (H N )≥0.2eV (35)

[0914] ELUMO (S B )–E LUMO (H N )≥0.2eV (36)

[0915] E HOMO (HBP)–E HOMO (H N )≥0.3eV (37)

[0916] Therefore, in a preferred embodiment of the present invention, the TADF material E is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy E HOMO (E B The highest occupied molecular orbital (HOMO) of ) B ), and the n-body H contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. N It has energy of E HOMO (H N The highest occupied molecular orbital (HOMO) of H N ), wherein preferably: E HOMO (E B )–E HOMO (H N ≥0.3 eV. That is, E HOMO (E B ) and E HOMO (H N The energy difference is preferably equal to or greater than 0.3 eV.

[0917] In a preferred embodiment of the present invention, the TADF material E is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E) B ), and includes, optionally, an n-body H in at least one light-emitting layer B of the organic electroluminescent device of the present invention. N It has energy E LUMO (H N The lowest unoccupied molecular orbital LUMO (H) N ), wherein preferably: E LUMO (E B )–E LUMO (H N )≥0.2eV. That is, E LUMO (E B ) and E LUMO (H N The energy difference is preferably equal to or greater than 0.2 eV.

[0918] In a preferred embodiment of the present invention, a small FWHM emitter S is included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy E LUMO (S B The lowest unoccupied molecular orbital (LUMO) of ) B ), and includes, optionally, an n-body H in at least one light-emitting layer B of the organic electroluminescent device of the present invention. N It has energy E LUMO (S B The lowest unoccupied molecular orbital (LUMO) of ) B ), and includes, optionally, an n-body H in at least one light-emitting layer B of the organic electroluminescent device of the present invention. N It has energy E LUMO (H N The lowest unoccupied molecular orbital LUMO (H) N ), wherein preferably: E LUMO (S B )–E LUMO (H N )≥0.2eV. That is, E LUMO (S B ) and E LUMO (H N The energy difference is preferably equal to or greater than 0.2 eV.

[0919] In a preferred embodiment of the present invention, the bipolar body H is optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention. BP It has the highest occupied molecular orbital HOMO (HBP), with an energy of E. HOMO (HBP), and optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention, n-body H N It has energy E HOMO (H N The highest occupied molecular orbital (HOMO) of H N ), wherein preferably: E HOMO (H BP )–E HOMO (H N ≥0.3 eV. That is, E HOMO (H BP ) and E HOMO (H N The energy difference is preferably equal to or greater than 0.3 eV.

[0920] In a preferred embodiment of the present invention, as long as the bipolar body H BPIf it exists in the light-emitting layer B, it preferably satisfies one, more, or all of the relationships represented by the following equations (38) to (40):

[0921] E HOMO (HBP)≤E HOMO (S B (38)

[0922] E LUMO (HBP)≤E LUMO (E B (39)

[0923] E LUMO (HBP) <E LUMO (S B (40)

[0924] Therefore, the bipolar host H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention BP Having the highest occupied molecular orbital HOMO(H) BP Its energy E HOMO (H BP Preferably, the small FWHM emitter S contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention is lower than or equal to that of the present invention. B The highest occupied molecular orbital HOMO (S B Energy E HOMO (S B ).

[0925] Furthermore, the bipolar host H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention BP Having the lowest unoccupied molecular orbital LUMO(H) BP Its energy E LUMO (H BP Preferably, the amount of TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention is lower than or equal to that in the present invention. B The lowest unoccupied molecular orbital LUMO (E B Energy E LUMO (E B ).

[0926] Furthermore, the bipolar host H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention BP Having the lowest unoccupied molecular orbital LUMO(H) BP Its energy E LUMO (H BP Preferably, the small FWHM emitter S is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B The lowest unoccupied molecular orbital LUMO (SB Energy E LUMO (S B ).

[0927] In a preferred embodiment of the present invention, as long as the bipolar body H BP If it exists in the light-emitting layer B, it preferably satisfies one, more, or all of the relationships represented by the following equations (41) to (43):

[0928] –0.3eV≤E HOMO (HBP)–E HOMO (E B )≤0.3eV (41)

[0929] E LUMO (E B )–E LUMO (HBP)≥0.2eV (42)

[0930] E LUMO (HBP)–E LUMO (S B )≥0.2eV (43)

[0931] Therefore, in a preferred embodiment of the invention, the bipolar body H optionally contained in at least one light-emitting layer B of the organic electroluminescent device of the invention BP Having the highest occupied molecular orbital HOMO(H) BP Its energy is E. HOMO (H BP ), and the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy E HOMO (E B The highest occupied molecular orbital (HOMO) of ) B ), wherein the preferred value is: –0.3eV≤E HOMO (H BP )–E HOMO (E B ≤0.3eV. In other words, the bipolar body H BP HOMO (H BP The energy can be higher or lower than that of the TADF emitter E. B HOMO (E B However, the energy difference should preferably not exceed 0.3 eV.

[0932] Furthermore, the TADF material E contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention B It has energy E LUMO (E BThe lowest unoccupied molecular orbital LUMO (E) B ), and includes, optionally, a bipolar host H in at least one light-emitting layer B of the organic electroluminescent device of the present invention. BP It has energy E LUMO (H BP The lowest unoccupied molecular orbital LUMO (H) BP ), wherein preferably: E LUMO (E B )-E LUMO (HBP)≥0.2eV. That is, E LUMO (E B ) and E LUMO (H BP The energy difference is preferably equal to or greater than 0.2 eV.

[0933] Furthermore, the bipolar body H optionally included in at least one light-emitting layer B of the organic electroluminescent device of the present invention BP It has energy E LUMO (H BP 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 of the present invention. B It has energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E) B ), wherein preferably: E LUMO (HBP)-E LUMO (S B ≥0.2 electron volts. That is, E LUMO (H BP ) and E LUMO (E B The energy difference is preferably equal to or greater than 0.2 eV.

[0934] In a preferred embodiment of the present invention, the relationship represented by the following formulas (44) and (45) is satisfied:

[0935] E HOMO (E B )≤E HOMO (S B (44)

[0936] E LUMO (E B ) <E LUMO (S B (45)

[0937] Therefore, in a preferred embodiment of the present invention, the TADF material E is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy E HOMO (E B The highest occupied molecular orbital (HOMO) of ) B E HOMO (E B Preferably, the size of the small FWHM emitter S contained in the light-emitting layer B is equal to or lower than that of the small FWHM emitter S. B The highest occupied molecular orbital HOMO (S B Energy E HOMO (S B ).

[0938] In a preferred embodiment of the present invention, the TADF material E is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B Having the lowest unoccupied molecular orbital LUMO(E) B Its energy E LUMO (E B Smaller than the small FWHM emitter S in the light-emitting layer B B The lowest unoccupied molecular orbital LUMO (S B Energy E LUMO (S B ).

[0939] In a preferred embodiment of the present invention, the following relationship is satisfied:

[0940] E LUMO (E B )–E LUMO (S B )≥0.2eV (46)

[0941] Therefore, in a preferred embodiment of the present invention, the TADF material E is contained in at least one light-emitting layer B of the organic electroluminescent device of the present invention. B It has energy E LUMO (E B The lowest unoccupied molecular orbital LUMO (E) B ), and the small FWHM emitter S contained in the light-emitting layer B B It has energy E LUMO (S B The lowest unoccupied molecular orbital (LUMO) of ) B ), wherein preferably: E LUMO (E B )–E LUMO (S B )≥0.2eV. That is, E LUMO(E B ) and E LUMO (S B The energy difference is preferably equal to or greater than 0.2 eV.

[0942] In a more preferred embodiment of the invention, two, three, more than three, or all of the relationships represented by equations (1) to (23), (29) to (33), (38) to (40), (44), and (45) above are satisfied, where this does not mean that all components mentioned in these relationships are preferably included in at least one light-emitting layer B of the organic electroluminescent device of the invention. For example, if n-body H is not included in any of the light-emitting layers B of the organic electroluminescent device according to the invention. N Then it can be understood that it involves n-subject H N The relations do not apply in this special case; they only apply to n-subject H. N Application at the time.

[0943] In a particularly preferred embodiment of the invention, two, three, more than three, or all of the relationships represented by equations (1) to (46) above are satisfied, wherein this does not mean that all components referred to in these relationships are preferably included in at least one light-emitting layer B of the organic electroluminescent device of the invention, but it is particularly preferred that all relationships selected from the group of relationships involving any included components apply.

[0944] Composition of light-emitting layer B

[0945] The organic electroluminescent device of the present invention may contain one or more host H in any amount and proportion. B (e.g., one or more p-substrate H) P and / or one or more n-subjects H N and / or one or more bipolar bodies H BP ), one or more TADF emitters E B and one or more FWHM luminescent bodies S B .

[0946] In a preferred embodiment of the present invention, each of at least one light-emitting layer B in the organic electroluminescent device of the present invention comprises a host material H. B (More specifically: H) P and / or H N and / or H BP More than (by weight) of at least one TADF material E B .

[0947] In a preferred embodiment of the present invention, each of at least one light-emitting layer B in the organic electroluminescent device of the present invention comprises at least one TADF material E. B More than (by weight) of at least one small FWHM emitter S B .

[0948] In a preferred embodiment, in the organic electroluminescent device of the present invention, each of the at least one light-emitting layer B comprises (or consists of):

[0949] (i) 30-89.9% by weight of one or more host compounds H B ;

[0950] (ii) 10-60% by weight of one or more TADF materials E B ;and

[0951] (iii) 0.1-10% by weight of one or more small FWHM luminescent materials S B ; and optional

[0952] (iv) 0-72% by weight of one or more solvents.

[0953] In a preferred embodiment, H N Optionally, in the organic electroluminescent device of the present invention, each of the at least one light-emitting layer B comprises (or consists of):

[0954] (i) 10-89.9% by weight of one or more p-host compounds H P ;

[0955] (ii) 0-79.9% by weight of one or more optional n-host compounds H N ;

[0956] (iii) 10-50% by weight of one or more TADF materials E B ;and

[0957] (iv) 0.1-10% by weight of one or more small FWHM luminescent particles S B ; and optional

[0958] (v) 0-72% by weight of one or more solvents.

[0959] In an even more preferred embodiment, H N Optionally, in the organic electroluminescent device of the present invention, each of the at least one light-emitting layer B comprises (or consists of):

[0960] (i) 22-87.5% by weight of one or more p-host compounds H P ;

[0961] (ii) 0-65.5% by weight of one or more optional n-host compounds H N ;

[0962] (iii) 12-40% by weight of one or more TADF materials E B ;and

[0963] (iv) 0.5-5% by weight of one or more small FWHM luminescent materials S B ; and optional

[0964] (v) 0-65.5% by weight of one or more solvents.

[0965] In another preferred embodiment, H N It is necessary that, in the organic electroluminescent device of the present invention, the light-emitting layer B comprises (or consists of) the following:

[0966] (i) 10-30% by weight of one or more p-host compounds H P ;

[0967] (ii) 40-79.9% by weight of one or more n-host compounds H N ;

[0968] (iii) 10-49% by weight of one or more TADF materials E B ;and

[0969] (iv) 0.1-10% by weight of one or more small FWHM luminescent particles S B ; and optional

[0970] (v) 0-34% by weight of one or more solvents.

[0971] In another preferred embodiment, H N It is necessary that, in the organic electroluminescent device of the present invention, the light-emitting layer B comprises (or consists of) the following:

[0972] (i) 40-74% by weight of one or more p-host compounds H P ;

[0973] (ii) 10-30% by weight of one or more n-host compounds H N ;

[0974] (iii) 10-49% by weight of one or more TADF materials E B ;and

[0975] (iv) 0.1-10% by weight of one or more small FWHM luminescent particles S B ; and optional

[0976] (v) 0-34% by weight) or one or more solvents.

[0977] As mentioned above, it should be understood that the different light-emitting layers B optionally included in the same organic electroluminescent device according to the present invention do not necessarily include the same material or even the same proportion of the same material.

[0978] In one embodiment, the light-emitting layer comprises not only the organic molecule according to the invention, but also a host material whose triplet (T1) and singlet (S1) energy levels are higher in energy than those of the organic molecule, particularly the at least one TADF material. B and / or at least one FWHM luminescent material S B The triplet state (T1) and the singlet state (S1).

[0979] Another aspect of the present invention relates to a composition comprising (or consisting of):

[0980] (a) At least one FWHM light emitter S according to the invention B Especially in the form of a luminescent body and / or a main body, and

[0981] (b) One or more light emitters (including TADF material E) B ) and / or main material H B It differs from the organic molecules according to the present invention, and

[0982] (c) Optionally one or more dyes and / or one or more solvents.

[0983] In one embodiment, the light-emitting layer comprises (or substantially consists of) a composition comprising (or consisting of):

[0984] (a) At least one FWHM light emitter S according to the invention B Especially in the form of a luminescent body and / or a main body, and

[0985] (b) One or more emitters (including TADF material E) B ) and / or main material H B It differs from the organic molecules according to the present invention, and

[0986] (c) Optionally one or more dyes and / or one or more solvents.

[0987] In one embodiment, the light-emitting layer EML comprises (or is substantially composed of) a composition comprising (or consisting of):

[0988] (i) 0.1-10% by weight, preferably 0.5-5% by weight, particularly 1-3% by weight of one or more FWHM light emitters according to the invention. B ;

[0989] (ii) 5-99% by weight, preferably 15-85% by weight, particularly 20-75% by weight of at least one main compound H B ;and

[0990] (iii) 0.9-94.9% by weight, preferably 14.5-80% by weight, particularly 24-77% by weight, of at least one other host compound D whose structure differs from that of the molecule according to the invention; and

[0991] (iv) Optional 0-94% by weight, preferably 0-65% by weight, particularly 0-50% by weight of solvent; and

[0992] (v) up to 30% by weight, particularly up to 20% by weight, preferably up to 5% by weight, of at least one other emitter F (including TADF material E) whose structure differs from the molecular structure described in this invention. B ).

[0993] Preferably, energy can be generated from the host compound H. B Transferred to one or more FWHM emitters S of the present invention B Especially from the host compound H B The first excited triplet state T1(H) B ) transferred to one or more organic molecules S according to the invention B The first excited triplet state T1(S) B ), and / or from the host compound H B The first excited singlet state S1(H) B ) transferred to one or more organic molecules S according to the invention B The first excited singlet state S1(S B ).

[0994] Architecture of light-emitting devices

[0995] Those skilled in the art will understand that the at least one light-emitting layer B is typically incorporated into the organic electroluminescent device of the present invention. Preferably, the 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.

[0996] Preferably, at least one light-emitting layer B is located between the anode layer A and the cathode layer C. Therefore, the general arrangement is preferably ABC. This, of course, does not preclude the presence of one or more alternative layers. These can be present on each side of A, B, and / or C.

[0997] Preferably, the anode layer A is located on the surface of the substrate. The substrate can be formed of any material or material composition. Typically, a glass slide is used as the substrate. Alternatively, a thin metal layer (e.g., copper, gold, silver, or aluminum film) or a plastic film or sheet can be used. This provides greater flexibility because at least one of the two electrodes should be (substantially) transparent to allow light to be emitted from the electroluminescent device (e.g., OLED). Typically, the anode layer A is primarily composed of a material capable of being fabricated into a (substantially) transparent film. Preferably, the anode layer A is primarily or even entirely composed of a transparent conductive oxide (TCO).

[0998] Such an anode layer A may, by way of example, include indium tin oxide, zinc aluminum oxide, tin fluoride oxide, zinc indium oxide, PbO, SnO, zirconium oxide, molybdenum oxide, vanadium oxide, tungsten oxide, graphite, doped Si, doped Ge, doped GaAs, doped polyaniline, doped polypyrrole and / or doped polythiophene, and mixtures of two or more thereof.

[0999] Particularly preferably, the anode layer A is (essentially) made of indium tin oxide (ITO) (e.g., (InO3)). 0.9 (SnO2) 0.1The anode layer A, composed of a hole injection layer (HIL), can compensate for the roughness caused by the transparent conductive oxide (TCO). Furthermore, the HIL can facilitate the injection of quasi-charge carriers (i.e., holes), specifically, the transport of quasi-charge carriers from the TCO to the hole transport layer (HTL). The hole injection layer (HIL) can comprise poly(3,4-ethylenedioxythiophene) (PEDOT), polystyrene sulfonate (PSS), MoO2, V2O5, CuPC, or CuI, particularly mixtures of PEDOT and PSS. The hole injection layer (HIL) also prevents metal diffusion from the anode layer A into the hole transport layer (HTL). HIL can include, for example, PEDOT:PSS (poly-3,4-ethylenedioxythiophene: polystyrene sulfonate), PEDOT (poly-3,4-ethylenedioxythiophene), mMTDATA (4,4',4”-tris[phenyl(m-tolyl)amino]triphenylamine), Spiro-TAD (2,2',7,7'-tetra(n,n-diphenylamino)-9,9'-spirodifluorene), DNTPD (N1,N1'-(biphenyl-4,4'-diyl)bis(N1-phenyl-N4,N4-di-m-tolylphenyl-1,4-diamine)), NPB (N N'-nis-(1-naphthyl)-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'-tetra(4-methoxyphenyl)-benzidine), HAT-CN(1,4,5,8,9,11-hexaazabenzohexacarbonyl) and / or Spiro-NPD(N,N'-diphenyl-N,N'-bis-(1-naphthyl)-9,9'-spirodifluorene-2,7-diamine)

[1000] Adjacent to the anode layer A or the hole injection layer (HIL), a hole transport layer (HTL) is typically provided. This HTL can be any hole transport compound. Exemplarily, electron-rich heteroaromatic compounds, such as triarylamines and / or carbazole, can be used as hole transport compounds. The HTL can lower the energy barrier between the anode layer A and the light-emitting layer B (used as the light-emitting layer (EML)). The hole transport layer (HTL) can also be an electron blocking layer (EBL). Preferably, the hole transport compound has a high triplet T1 energy level. For example, the hole transport layer (HTL) may contain star-shaped heterocycles such as tris(4-carbazolyl-9-ylphenyl)amine (TCTA), poly-TPD (poly(4-butylphenyl-diphenylamine)), [α]-NPD (poly(4-butylphenyl-diphenylamine)), TAPC (4,4'-cyclohexyl-bis[N,N-bis(4-methylphenyl)aniline]), 2-TNATA (4,4',4”-tris[2-naphthyl(phenyl)-amino]triphenylamine), Spiro-TAD, DNTPD, NPB, NPPNB, MeO-TPD, HAT-CN, and / or TrisPcz. 9,9'-Diphenyl-6-(9-phenyl-9H-carbazole-3-yl)-9H,9'H-3,3'-bicarbazole). Furthermore, the HTL may include a p-doped layer, which may consist of inorganic or organic dopants in an organic hole transport matrix. Transition metal oxides such as vanadium oxide, molybdenum oxide, or tungsten oxide can be exemplarily used as inorganic dopants. Tetrafluorotetracyanoquinone dimethyl ether (F4-TCNQ), copper pentafluorobenzoate (Cu(I)pFBz), or transition metal complexes can be exemplarily used as organic dopants.

[1001] EBLs may include, for example, mCP (1,3-bis(carbazole-9-yl)benzene), TCTA, 2-TNATA, mCBP (3,3-bis(9H-carbazole-9-yl)biphenyl), 9-[3-(dibenzofuran-2-yl)phenyl]-9H-carbazole, 9-[3-(dibenzofuran-2-yl)phenyl]-9H-carbazole, 9-[3-(dibenzothiophene-2-yl)benzene]-9H-carbazole, etc. [3,5-bis(2-dibenzofuranyl)phenyl]-9H-carbazole, 9-[3,5-bis(2-dibenzothiophene)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).

[1002] The composition of the at least one light-emitting layer B is as described above. According to the present invention, any one or more light-emitting layers B preferably have a thickness of no more than 1 mm, more preferably no more than 0.1 mm, even more preferably no more than 10 μm, even more preferably no more than 1 μm, and particularly preferably no more than 0.1 μm.

[1003] In the electron transport layer (ETL), any electron transport material can be used. Exemplarily, electron-deficient compounds such as benzimidazole, pyridine, triazole, oxadiazole (e.g., 1,3,4-oxadiazole), phosphine oxide, and sulfone can be used. Exemplarily, the electron transporter ETM can also be a star-shaped heterocycle, such as 1,3,5-tris(1-phenyl-1H-benzi[d]imidazole-2-yl)phenyl (TPBi). ETMs can be exemplary, such as NBphen (2,9-bis(naphthyl-2-yl)-4,7-diphenyl-1,10-phenanthroline), Alq3 (tris(8-hydroxyquinoline)aluminum), TSPO1 (diphenyl-4-triphenylsilylphenylphosphine oxide), BPyTP2 (2,7-bis(2,2'-bipyridin-5-yl)biphenyl), Sif87 (dibenzo[b,d]thiophene-2-yltriphenylsilane), Sif88 (dibenzo[b,d]thiophene-2-yl)diphenylsilane), BmPyPhB (1,3-bis[3,5-bis(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 can be doped with a material such as Liq (lithium 8-hydroxyquinoline alcohol). Optionally, a second electron transport layer may be disposed between the electron transport layer and the cathode layer C. The electron transport layer (ETL) may also be used to block holes, or a hole blocking layer (HBL) may be introduced.

[1004] HBLs can include, for example, HBM1:

[1005] BCP (2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline = Bathocuproline), BAlq (bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum), NBphen

[1006] 2,9-bis(naphthyl-2-yl)-4,7-diphenyl-1,10-phenanthroline), Alq3 (tris(8-hydroxyquinoline)aluminum), TSP01 (diphenyl-4-triphenylsilylphenylphosphine oxide), T2T (2,4,6-tris(biphenyl-3-yl)-1,3,5-triazine), T3T (2,4,6-tris(triphenyl-3-yl)-1,3,5-triazine), TST (2,4,6-tris(biphenyl-3-yl)-1,3,5-triazine), (9,9'-spirodifluorene-2-yl)-1,3,5-triazine), DTST (2,4-diphenyl-6-(3'-triphenylsilylphenyl)-1,3,5-triazine), DTDFB (2,8-bis(4,6-diphenyl-1,3,5-triazinyl)dibenzofuran) and / or TCB / TCP (1,3,5-tris(N-carbazolyl)benzene / 1,3,5-tris(carbazolyl)-9-yl)benzene).

[1007] Adjacent to the electron transport layer (ETL), a cathode layer C may be disposed. Exemplarily, the cathode layer C may comprise (or may be composed 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 be composed of a (substantially) opaque metal such as Mg, Ca, or Al. Alternatively or additionally, the cathode layer C may also comprise graphite and / or carbon nanotubes (CNTs). Alternatively, the cathode layer C may also be composed of nanoscale silver wires.

[1008] In a preferred embodiment, the organic electroluminescent device of the present invention comprises at least the following layers:

[1009] A) Anode layer A, which contains at least one component selected from indium tin oxide, indium zinc oxide, PbO, SnO, graphite, doped silicon, doped germanium, doped GaAs, doped polyaniline, doped polypyrrole, doped polythiophene, and mixtures of two or more thereof;

[1010] B) the light-emitting layer B according to the present invention; and

[1011] C) Cathode layer C, which contains at least one component selected from 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, wherein the light-emitting layer B is located between the anode layer A and the cathode layer C.

[1012] In one embodiment, when the organic electroluminescent device is an OLED, it may optionally include the following layer structure:

[1013] A) Anode layer A, exemplary comprising indium tin oxide (ITO);

[1014] HTL (Hole Transport Layer);

[1015] B) The light-emitting layer B according to the present invention;

[1016] ETL (Electronic Transport Layer); and

[1017] C) Cathode layer, exemplarily comprising Al, Ca and / or Mg.

[1018] Preferably, the layer order here is A-HTL-B-ETL-C.

[1019] In addition, organic electroluminescent devices may optionally include one or more protective layers to protect the device from harmful substances in the environment, including, for example, moisture, vapor and / or gaseous substances.

[1020] Electroluminescent devices (such as OLEDs) may optionally have a protective layer (which may be called an electron injection layer (EIL)) between the electron transport layer (ETL) D and the cathode layer C. This protective layer may contain lithium fluoride, cesium fluoride, silver, Liq (8-hydroxyquinoline lithium), Li2O, BaF2, MgO and / or NaF.

[1021] Unless otherwise stated, any layer in the various embodiments can be prepared by any suitable method. In the context of this invention, the layer, including the light-emitting layer B, can optionally be prepared by a liquid processing process (also known as “film processing,” “fluid processing,” “solution processing,” or “solvent processing”). This means that the components contained in the respective layer are applied in a liquid state to the surface of the device component. Preferably, in the context of this invention, the layer, including the light-emitting layer B, can be prepared by spin-coating. Those skilled in the art will know that this method can yield thin and (substantially) uniform layers.

[1022] Alternatively, the layer in the context of this invention, including at least one luminescent layer B, can be prepared by other methods based on liquid processing processes, such as casting (e.g., drop casting) and rolling methods, and printing methods (e.g., inkjet printing, gravure printing, doctor blade coating). This can optionally be carried out in an inert atmosphere (e.g., in a nitrogen atmosphere).

[1023] In another preferred embodiment, the layer in the context of the present invention, including at least one light-emitting layer B, can be prepared by any other method known in the art, including but not limited to vacuum processing methods known to those skilled in the art, such as thermal (co)evaporation, organic vapor phase deposition (OVPD), and organic vapor jet printing deposition (OVJP).

[1024] When the layer is prepared by liquid processing, the solution containing the components of the layer (i.e., for the light-emitting layer B of the present invention, it contains at least one host compound HB and at least one TADF material E) B and at least one small FWHM luminescent body S BThe product may further comprise a volatile organic solvent. The volatile organic solvent may optionally be selected from tetrahydrofuran, dioxane, chlorobenzene, diethylene glycol diethyl ether, 2-(2-ethoxyethoxy)ethanol, γ-butyrolactone, N-methylpyrrolidone, ethoxyethanol, xylene, toluene, anisole, phenol, acetonitrile, tetrahydrothiophene, benzonitrile, pyridine, trihydrofuran, triarylamine, cyclohexanone, acetone, propylene carbonate, ethyl acetate, benzene, and PGMEA (propylene glycol monoethyl ether acetate). Combinations of two or more solvents may also be used. After forming a liquid layer, it may subsequently be dried and / or cured by any means in the art, for example, under ambient conditions, at elevated temperatures (e.g., about 50°C or about 60°C), or under reduced pressure.

[1025] The organic electroluminescent device of the present invention can be a thin layer with a thickness of no more than 5 mm, no more than 2 mm, no more than 1 mm, no more than 0.5 mm, no more than 0.25 mm, no more than 100 μm, or even no more than 10 micrometers.

[1026] Organic electroluminescent devices (e.g., OLEDs) can be small in size (e.g., having a diameter of no more than 5 mm). 2 or even no more than 1mm 2 (Surface area), medium size (e.g., with a surface area of ​​0.5 to 20 cm) 2 (the surface of the surface), or large in size (e.g., with a surface greater than 20cm). 2 The organic electroluminescent devices (e.g., OLEDs) according to the invention can optionally be used to produce screens, as large-area lighting devices, as luminescent wallpaper, luminescent window frames or glass, luminescent labels, luminescent signage, or flexible screens or displays. In addition to common uses, organic electroluminescent devices (e.g., OLEDs) can also be used as luminescent films, "smart packaging" labels, or innovative design elements. Furthermore, they can be used for cell detection and examination (e.g., as biomarkers).

[1027] Further definitions and information

[1028] As used throughout this document, the term "layer" in the context of this invention preferably refers to a plane-dominant geometry.

[1029] As used herein, the terms organic electroluminescent device and photoelectric luminescent device can be understood in the broadest sense as any device comprising one or more luminescent layers B, each luminescent layer B comprising at least one host material H. B At least one TADF material E B and at least one small FWHM luminescent body S B All of these are subject to the above definition.

[1030] Organic electroluminescent devices can be broadly understood as any device based on organic light-emitting materials, as long as it emits light in the visible or ultraviolet (UV) range, i.e., a wavelength range of 380-800 nm. More preferably, organic electroluminescent devices can emit light in the visible range, i.e., a wavelength range of 400 to 800 nm.

[1031] In a preferred embodiment of the present invention, the organic electroluminescent device is selected from organic light-emitting diodes (OLEDs), light-emitting electrochemical cells (LECs), and light-emitting transistors.

[1032] Particularly preferably, the organic electroluminescent device is an organic light-emitting diode (OLED). Optionally, the organic electroluminescent device as a whole can be opaque, translucent, or (substantially) transparent.

[1033] As used throughout this application, the term "aromatic moiety" may be understood in the broadest sense as any bi- or polycyclic aromatic moiety that satisfies the following definition.

[1034] 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 contains 6 to 60 aromatic ring atoms, and a heteroaryl contains 5 to 60 aromatic ring atoms, at least one of which is a heteroatom. Nevertheless, throughout this application, the number of aromatic ring atoms may be given as a subscript number in the definitions of certain substituents. In particular, a heteroaryl ring includes one to three heteroatoms. Again, the terms "heteroaryl" and "heteroaromatic" can be understood in the broadest sense as any monocyclic, bicyclic, or polycyclic heteroaromatic moiety including at least one heteroatom. The heteroatom may be the same or different each time it appears and is independently selected from N, O, and S. Thus, the term "aryl" refers to a divalent substituent having two sites that can bind to other molecular structures and thus can be used as a linking structure. If the definitions of the exemplary embodiments differ from those given herein, for example, different definitions of the number of aromatic ring atoms or the number of heteroatoms, the definitions of the exemplary embodiments shall prevail. According to the present invention, the annulated aromatic or heteroaromatic polycyclic rings consist of two or more monoaromatic or heteroaromatic rings that form polycyclic rings through a condensation reaction.

[1035] Specifically, as used throughout this application, the term "aryl group" or "heteroaryl group" includes groups that can be combined at any position with an aromatic or heteroaryl group derived from benzene, naphthalene, anthracene, phenanthrene, pyrene, dihydropyrene, perylene, dinaphthalene-2, fluoranthene, benzo[a]anthene, benzo[a]phenanthrene, tetraphenylene, pentaphenylene, benzo[a]pyrene, furan, benzo[a]furan, isobenzo[a]furan, dibenzo[a]furan, thiophene, benzo[a]thiophene, isobenzo[a]thiophene, dibenzo[a]thiophene; pyrrole, indole, isoindole, carbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, phenothiazine, phenothiazine, pyrazole, indazole, imidazole, benzo[a]imidazole Zyrazole, naphthimazole, phenanthreneimidazole, pyridinimidazole, pyrazinimidazole, quinoxalineimidazole, oxazole, benzoxazole, naphthoxazole, anthraxazole, phenanthreneimidazole, isoxazole, 1,2-thiazole, 1,3-thiazole, benzothiazole, pyridazine, benzopyridazine, pyrimidine, benzopyrimidine, 1,3,5-triazine, quinoxaline, pyrazine, phenazine, naphthidine, carboline, benzocarboline, phenanthrene, 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-tetraazine, purine, pteridine, indene and benzothiadiazole or combinations of the above groups.

[1036] As used throughout this application, the term "cyclic group" may be understood in the broadest sense as any monocyclic, bicyclic, or polycyclic moieties.

[1037] As used above and in this document, the term "alkyl" can be understood in the broadest sense as any straight-chain, branched, or cyclic alkyl substituent. Specifically, the term alkyl includes substituents such as methyl (Me), ethyl (Et), n-propyl (nPr), isopropyl (iPr), cyclopropyl, n-butyl (nBu), isobutyl (iBu), s-butyl (sBu), tert-butyl (iBu), cyclobutyl, 2-methylbutyl, n-pentyl, secondary-pentyl, tert-pentyl, 2-pentyl, neopentyl, cyclopentyl, n-hexyl, secondary-hexyl, tert-hexyl, 2-hexyl, 3-hexyl, neohexyl, cyclohexyl, 1-methylcyclopentyl, 2-methyl pentyl, 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-octyl- 1-yl, 1,1-dimethyl-n-dec-1-yl, 1,1-dimethyl-n-dodecyl-1-yl, 1,1-dimethyl-n-tetradecyl-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-heptyl, 1,1-diethyl-n-octyl, 1,1-diethyl- n-decyl-1-yl, 1,1-diethyl-n-dodecyl-1-yl, 1,1-diethyl-n-tetradecyl-1-yl, 1,1-diethyl-n-hexadecyl-1-yl, 1,1-diethyl-n-octadec-1-yl, 1-(n-propyl)-cyclohexyl-1-yl, 1-(n-butyl)-cyclohexyl-1-yl, 1-(n-hexyl)-cyclohexyl-1-yl, 1-(n-octyl)-cyclohexyl-1-yl and 1-(n-decyl)-cyclohexyl-1-yl.

[1038] As used above and here, the term "alkenyl" includes straight-chain, branched, and cyclic alkenyl substituents. The term alkenyl includes substituents such as vinyl, propenyl, butenyl, pentenyl, cyclopentenyl, hexenyl, cyclohexenyl, heptenyl, cycloheptenyl, octenyl, cyclooctenyl, or cyclooctadienyl, etc.

[1039] As used above and here, the term "alkynyl" includes straight-chain, branched, and cyclic alkynyl substituents. The term alkynyl includes ethynyl, propynyl, butynyl, penynyl, hexynyl, hepynyl, or octyynyl, etc.

[1040] As used above and here, the term "alkoxy" includes straight-chain, branched, and cyclic alkoxy substituents. The term alkoxy includes methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy, and 2-methylbutoxy, among others.

[1041] As used above and here, the term "thioalkoxy" includes straight-chain, branched, and cyclic thioalkoxy substituents, wherein, by way of example, the O of the alkoxy group is replaced by S.

[1042] As used above and in this article, the terms “halogen” and “halogenated” can be understood in the broadest sense as preferably fluorine, chlorine, bromine or iodine.

[1043] Whenever hydrogen (H) is mentioned in this article, it can be replaced by deuterium each time it appears.

[1044] It should be understood that when a molecular segment is described as a substituent or otherwise attached to another moiety, its name can be written as if it were a segment (e.g., naphthyl, dibenzofuranyl) or as if it were a whole molecule (e.g., naphthalene, dibenzofuran). As used herein, these different ways of specifying substituents or attached segments are considered equivalent.

[1045] Unless otherwise specified, percentages refer to weight percentages (weight / weight, w / w, wt.%).

[1046] For the host compound H B (More specifically: H) P and H N The energy of the first excited triplet state T1 is determined at the start of the time-gated emission spectrum at 77 K, typically with a delay time of 1 ms and an integration time of 1 ms, unless otherwise specified, in the host material H B Measurement in pure thin films

[1047] For TADDF material E B The energy of the first excited triplet state T1 is determined at the start of the time-gated emission spectrum at 77 K, typically with a delay time of 1 ms and an integration time of 1 ms, unless otherwise specified, in a 10% (by weight) emitter E B Measured in poly(methyl methacrylate, PMMA) films.

[1048] For small half-height full width (FWHM) light emitters S B The energy of the first excited triplet state T1 is determined at the start of the time-gated emission spectrum at 77 K, typically with a delay time of 1 ms and an integration time of 1 ms, unless otherwise specified, in an emitter S with 1 to 5% (by weight), particularly 1% (by weight). BIt was measured in poly(methyl methacrylate, PMMA) films.

[1049] Orbital and excited-state energies can be determined using experimental methods known to those skilled in the art. Experimentally, the highest occupied molecular orbital E0... HOMO The energy was determined from cyclic voltammetry measurements using methods known to those skilled in the art, with an accuracy of 0.1 eV. The lowest unoccupied molecular orbital E LUMO The energy is calculated as E HOMO +E gap E gap The following is confirmed:

[1050] For the host compound H B (More specifically: H) P and H N Unless otherwise stated, the emission activation of a pure thin film of the host material is used as E. gap This corresponds to the energy of the first excited singlet state S1.

[1051] For TADDF material E B Unless otherwise stated, the emission-on of a thin film of TADF material (10% by weight in polymethyl methacrylate (PMMA)) is used as E. gap This corresponds to the energy of the first excited singlet state S1.

[1052] For small FWHM) luminescent bodies S B , will the light source S B The emission-on of the film (1 to 5% by weight, particularly 1% by weight in polymethyl methacrylate (PMMA)) is used as E gap This corresponds to the energy of the first excited singlet state S1.

[1053] As used herein, unless otherwise specified in a particular context, the color of emitted and / or absorbed light is specified as follows:

[1054] Purple: Wavelength range >380-420nm;

[1055] Deep blue: wavelength range >420-475nm;

[1056] Sky blue: wavelength range >475-500nm;

[1057] Green: Wavelength range >500-560nm;

[1058] Yellow: Wavelength range >560-580nm;

[1059] Orange: Wavelength range >580-620nm;

[1060] Red: Wavelength range >620-800nm.

[1061] Unless otherwise specified, for small FWHM luminescent bodies S B This type of color refers to the presence of 2% by weight of luminescent S in poly(methyl methacrylate), i.e., PMMA. B The maximum emission value λ of the thin film max PMMA For TADF material E B This type of color refers to the color of 10% TADF material in poly(methyl methacrylate), i.e., PMMA. B The maximum emission value λ of the thin film max PMMA . Example

[1062] Cyclic voltammetry

[1063] Cyclic voltammograms were measured for solutions with an organic molecule concentration of 10⁻³ mol / L, in dichloromethane or a suitable solvent, and including a suitable supporting electrolyte (e.g., 0.1 mol / L tetrabutylammonium hexafluorophosphate). Measurements were performed at room temperature and under a nitrogen atmosphere using a three-electrode assembly (working and counter electrodes: Pt line, reference electrode: Pt line) and calibrated using FeCp²⁺ / FeCp²⁺ as an internal standard. HOMO data were calibrated for SCE using ferrocene as an internal standard.

[1064] Density functional theory calculation

[1065] The molecular structure was optimized using BP86 functional and the resolution of identity approach. Excitation energies of the BP86-optimized structure were calculated using the time-correlated DFT (TD-DFT) method. Orbital and excited-state energies were calculated using the B3LYP functional method. The Def2-SVP basis set (and an m4 grid for numerical integration) were employed. All calculations were performed using the Turboomole package.

[1066] Photophysical measurements

[1067] Sample pretreatment: spin coating

[1068] Instruments: Spin150, SPS euro.

[1069] The sample concentration was 10 mg / ml, and it was dissolved in a suitable solvent.

[1070] Program: 1) 3 seconds, 400 U / min; 2) 20 seconds, 1000 U / min, 1000 Upm / s; 3) 10 seconds, 4000 U / min, 1000 Upm / s. After coating, dry the film at 70°C for 1 minute.

[1071] Photoluminescence spectroscopy and TCSPC (Time-correlated single-photon counting)

[1072] Steady-state emission spectra were recorded using a Horiba Scientific Modell FluoroMax-4 instrument. This instrument is equipped with a 150W xenon arc lamp, excitation and emission monochromators, and a Hamamatsu R... 92 8 photomultiplier tubes, and time-correlated single-photon counting options.

[1073] Excited-state lifetimes were determined using the FM-2013 device and the Horiba Yvon TCSPC hub according to the TCSPC method.

[1074] Excitation source:

[1075] NanoLED 370 (wavelength: 371nm, pulse duration: 1.1ns)

[1076] NanoLED 290 (wavelength: 294nm, pulse duration: <1ns)

[1077] SpectraLED 310 (wavelength: 314nm)

[1078] SpectraLED 355 (wavelength: 355nm).

[1079] Data analysis (exponential fitting) was performed using the DataStation and DAS6 software suites. The chi-squared test was used for fitting.

[1080] Photoluminescence quantum yield measurement

[1081] Photoluminescent quantum yield (PLQY) was measured using an absolute PL quantum yield measurement system (Hamamatsu Photonics) C9920-03G. Quantum yield and CIE coordinates were determined using software U6039-05 version 3.6.0.

[1082] Maximum emission value is in nm, quantum yield Φ is in % and CIE coordinates are x, y values.

[1083] PLQY is determined using the following protocol:

[1084] 1) Quality Assurance: The anthracene concentration in ethanol (known concentration) is used as a reference.

[1085] 2) Excitation wavelength: Determine the maximum absorption value of organic molecules and use this wavelength to excite the molecules.

[1086] 3) Measurement

[1087] The quantum yield of solution or thin film samples was measured under a nitrogen atmosphere. The yield was calculated using the following equation:

[1088]

[1089] Where n photon Indicates photon count, and Int. indicates intensity.

[1090] Production and characterization of organic electroluminescent devices

[1091] OLED devices incorporating the organic molecules of this invention can be produced using a vacuum deposition method. If a layer contains more than one compound, the weight percentage of one or more compounds is expressed as %. The total weight percentage value is 100%, therefore, if no % value is given for a compound, the fraction of that compound is equal to the difference between the given value and 100%.

[1092] Characterization of incompletely optimized OLEDs: Electroluminescence spectra were measured using standard methods, and intensity-dependent external quantum efficiency (in %) was calculated based on the light and current detected by the photodiode. The lifetime of the OLED device was inferred from the brightness variation during operation at a constant current density. The LT50 value corresponds to the time it takes for the measured brightness to decrease to 50% of the initial brightness; similarly, LT80 corresponds to the time it takes for the measured brightness to decrease to 80% of the initial brightness, LT97 corresponds to the time it takes for the measured brightness to decrease to 97% of the initial brightness, and so on.

[1093] Accelerated lifetime measurement operations (e.g., applying increased current density). For example, 500 cd / m 2 The LT80 value is determined using the following equation:

[1094]

[1095] Where L0 represents the initial brightness under the applied current density.

[1096] The average of this value across several pixels (typically 2 to 8) is used as the standard deviation among these pixels. The figure shows a series of data for an OLED pixel.

[1097] Experimental results

[1098] Material

[1099] HBM1 (Plugging Material)

[1100]

[1101] Main material H B (The example here is p-body H) P )

[1102]

[1103] Table 1H. Properties of the main material

[1104]

[1105] LUMO CV It is the energy of the lowest unoccupied molecular orbital, determined by cyclic voltammetry.

[1106] TADF material E B

[1107]

[1108]

[1109] Table 1. TADF Material E B Characteristics

[1110]

[1111] LUMO CV It is the energy of the lowest unoccupied molecular orbital, determined by cyclic voltammetry.

[1112] Small FWHM luminescent body S B

[1113]

[1114]

[1115] Table 1. S. Small FWHM luminescent material S B Characteristics

[1116]

[1117] *Measured in DCM (0.01 mg / mL).

[1118] Table 2. Setup of exemplary organic light-emitting device (OLED) H and comparative example OLED T.

[1119] layer thickness T H 10 100nm Al Al 9 2nm Liq Liq 8 20nm NBPhen NBPhen 7 10nm HBM1 HBM1 6 50nm <![CDATA[H P :AND B ]]> <![CDATA[H P :E B :S B ]]> 5 10nm HP HP 4 10nm TCTA TCTA 3 50nm NPB NPB 2 5nm HAT-CN HAT-CN 1 50nm ITO ITO substrate Glass Glass

[1120] To evaluate the effectiveness of the present invention, a comparative experiment was conducted in which only the composition of the light-emitting layer (6) was changed.

[1121] Result I: Subject H B (with p-body H) P (For example) and luminescent body S B Changes

[1122] Composition of luminescent layer B (percentage refers to weight percentage):

[1123] layer T H Emissive layer (6A) <![CDATA[H P (85%)∶E B (15%)]]> <![CDATA[H P (84%)∶E B (15%)∶S B (1%)]]>

[1124] Where E B -10 is used as TADF material E B Small FWHM transmitter S B The change lies in using different p-subjects H P .

[1125] The settings for EB=EB-10 and HP=mCBP are as follows:

[1126]

[1127] Result II: Subject H B and TADF E B Changes

[1128] Settings for luminescent layer B (percentage refers to weight percentage):

[1129] layer T H Emissive layer (6A) <![CDATA[H P (85%)∶E B (15%)]]> <![CDATA[H P (84%)∶E B (15%)∶S B (1%)]]>

[1130] Where S B -1 is used as a small FWHM light source S B TADF material E B The change lies in using different p-subjects H P .

[1131] S B =S B -1 and H P =mCBP setting result:

[1132]

[1133] S B =S B -1 and H P =PYD2 settings result:

[1134]

[1135]

[1136] For all electroluminescent devices that use a combination of a main body, a TADF emitter, and an FWHM emitter (H-type device), its mCBP is considered as H. P and E B -10 as E B Compared to the T-type device, the transmitter S can be observed to... B The relative lifetime increased by 374% (from 1.00 to 4.74) with the transmitter S. B The relative lifetime increased by 188% (from 1.00 to 2.88) with the -2, and this can be observed in the transmitter S. B The relative lifetime increased by 193% (from 1.00 to 2.93) with -3, while the efficiency (EQE) remained almost unchanged.

[1137] Furthermore, for those using mCBP as H P and using E B -10 as E B All H-type devices, compared with the contrasting T-type devices, show an observable emitting element S. B The full width at half maximum (FWHM) decreased by 47% (from 76 nm to 36 nm) for the emitting electron S. B The full width at half maximum (FWHM) of the emitter S decreased by 47% (from 76 nm to 36 nm), and the emitter S B The full width at half maximum (FWHM) decreased by 47% (from 76 nm to 40 nm) at -3. Using mCBP as H P E B -10 as E B and S B -1、S B -2 or S B -3 as S B All H-type and T-type devices exhibit maximum emission in the desired green wavelength range of 500 nm to 560 nm, and even more preferably in the range of 510 nm to 550 nm.

[1138] For all those using PYD2 as H P and E B -10 as E B Compared to the T-type device, the H-type device shows that the emitting element S... B The relative lifetime of -1 increased by 603% (from 1.00 to 7.03), and the luminescent S BThe relative lifetime of -2 increased by 303% (from 1.00 to 4.03), and the luminescent S B The relative lifetime increased by 58% (from 1.00 to 1.58) with PYD2 -3, while the efficiency (EQE) remained almost unchanged. Furthermore, for using PYD2 as H... P and using E B -10 as E B All H-type devices, compared with the contrasting T-type devices, show an observable emitting element S. B The full width at half maximum (FWHM) decreased by 46% (from 78 nm to 42 nm) for the emitting electron S. B -2 reduces FWHM by 46% (from 78nm to 42nm), and the emitter S B -3% reduction in FWHM (from 78nm to 42nm). Using PYD2 as H P E B -10 as E B and S B -1、S B -2 or S B -3 as S B All H-type and T-type devices exhibit maximum emission 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.

[1139] For all users using mCBP as H P and S B -1 as S B Compared to the T-type device, the H-type device shows that using E... B The relative lifespan increased by 89% (from 1.00 to 1.89) at -1, using E B The relative lifespan increased by 120% at -3°C (from 0.59 to 1.79), using E B The relative lifespan increased by 120% at -4°C (from 1.09 to 2.29), using E B The relative lifespan increased by 700% at -8 (from 2.20 to 9.20), and the use of E... B At -10°C, the relative lifetime increased by 859% (from 2.29 to 10.88), while the efficiency (EQE) remained almost unchanged. Furthermore, for all applications using mCBP as H... P and S B -1 as S B Compared to the corresponding T-type device, the H-type device shows that E... B The full width at half maximum (FWHM) decreased by 23% (from 86nm to 68nm) to -1, E B-3% reduction in FWHM (from 76nm to 36nm), E B -4 reduces FWHM by 50% (from 80nm to 40nm), E B -8% reduction in FWHM (from 78nm to 42nm), E B The FWHM was reduced by 53% (from 76nm to 36nm) by -10. Using mCBP as H P S B -1 as S B and E B -1、E B -3、E B -4、E B -8 or E B -10 as E B All H-type and T-type devices exhibit maximum emission 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.

[1140] For all those using PYD2 as H P and S B -1 as S B Compared to the T-type device, the H-type device shows that using E... B The relative lifespan increased by 399% at -3°C (from 1.00 to 4.99), using E B The relative lifespan increased by 590% at -4°C (from 1.86 to 7.76), using E B The relative lifespan increased by 120% at -5°C (from 0.44 to 2.37), using E... B The relative lifespan increased by 136% at -6 (from 1.08 to 2.44), using E B The relative lifespan increased by 781% (from 2.56 to 10.37) at -8°C, using E... B At -10°C, the relative lifetime increased by 981% (from 1.63 to 11.44), while the efficiency (EQE) remained largely unchanged. Furthermore, for all applications using PYD2 as H... P and S B -1 as S B Compared to the corresponding T-type device, the H-type device shows that E... B The full width at half maximum (FWHM) decreased by 47% (from 76nm to 40nm) at -3, E B -4% reduction in FWHM (from 80nm to 42nm), E B -5% reduction in FWHM (from 78nm to 42nm), E B-6% reduction in FWHM (from 75nm to 40nm), E B -8% reduction in FWHM (from 76nm to 42nm), E B The FWHM was reduced by 47% (from 78nm to 42nm) by -10. Using PYD2 as the H... P S B -1 as S B and E B -3、E B -4、E B -5、E B -5、E B -8 or E B -10 as E B All H-type and T-type devices exhibit maximum emission 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.

[1141] Other examples of the organic electroluminescent devices of the present invention:

[1142] Example D1

[1143] Small FWHM luminescent body S B -1 was also tested in OLED D1, which has the following layer structure:

[1144] layer# thickness D1 10 100nm Al 9 2nm Liq 8 20nm NBPhen 7 10nm HBM1 6 50nm <![CDATA[mCBP(79%):E B -11(20%):S B -1(1%)]]> 5 10nm mCBP 4 10nm TCTA 3 50nm NPB 2 5nm HAT-CN 1 50nm ITO substrate Glass

[1145]

[1146] OLED D1 at 1000cd / m 2 The external quantum efficiency (EQE) is 16.1%. Its maximum emission wavelength is 532 nm, and its FWHM at 7.6 V is 38 nm. The corresponding CIEx value is 0.32, and CIEy value is 0.65. At 1200 cd / m²... 2 Under the limited conditions, the LT95 value was measured to be 1522 hours.

[1147] Example D2

[1148] Small FWHM luminescent body S B -1 was also tested in OLED D2, which has the following layer structure:

[1149] layer# thickness D2 10 100nm Al 9 2nm Liq 8 20nm NBPhen 7 10nm HBM1 6 50nm <![CDATA[mCBP(84%):E B -11(15%):S B -1(1%)]]> 5 10nm <![CDATA[PYD2=H P -2]]> 4 10nm TCTA 3 50nm NPB 2 5nm HAT-CN 1 50nm ITO substrate Glass

[1150] At 1000cd / m 2At this time, the external quantum efficiency (EQE) of OLED D2 is 17.7%. Its maximum emission wavelength is 532 nm, and its open-wavelength (FWHM) is 36 nm at 7.6 V. The corresponding CIEx value is 0.31, and the CIEy value is 0.65. At 1200 cd / m²... 2 The measured LT95 value under the given conditions was 2006 hours.

[1151] Example D3

[1152] Small FWHM luminescent body S B -1 was also tested in OLED D3, which has the following layer structure:

[1153] layer# thickness D2 10 100nm Al 9 2nm Liq 8 20nm NBPhen 7 10nm HBM1 6 50nm <![CDATA[mCBP(75%):PYD2=H P -2(5%):E B -11(15%):S B -1(1%)]]> 5 10nm <![CDATA[PYD2=H P -2]]> 4 10nm TCTA 3 50nm NPB 2 5nm HAT-CN 1 50nm ITO substrate Glass

[1154] At 1000 cd / m², OLED D3 achieves an external quantum efficiency (EQE) of 20.2%. Its maximum emission wavelength is 532 nm, with an FWHM of 38 nm at 7.6 V. The corresponding CIEx value is 0.32, and the CIEy value is 0.65. At 1200 cd / m², 2 Under the limited conditions, the LT95 value was measured to be 1866 hours.

[1155] Example D4

[1156] Small FWHM luminescent body S B -3 was also tested in OLED D4, which has the following layer structure:

[1157]

[1158]

[1159] At 1000 cd / m², the external quantum efficiency (EQE) of OLED D4 is 16.3%. Its maximum emission wavelength is 516 nm, and its open-wavelength (FWHM) is 40 nm at 7.0 V. The corresponding CIEx value is 0.27, and the CIEy value is 0.65. At 1200 cd / m², the external quantum efficiency (EQE) of OLED D4 is 16.3%. 2 Under the limited conditions, the LT95 value was measured to be 1162 hours.

Claims

1. An organic electroluminescence device comprising one or more light-emitting layers B, each of said light-emitting layers B independently of each other comprising: (i) at least one host material H B having a lowest excited singlet energy level E(S1 H ) and a lowest excited triplet energy level E(T1 H ). (ii) at least one thermally activated delayed fluorescence (TADF) material E B having a lowest excited singlet state energy level E(S1 E ) and a lowest excited triplet state energy level E(T1 E ); and (iii) at least one small full width at half maximum (FWHM) emitter S B having a lowest excited singlet state energy level E(S1 S ) and a lowest excited triplet state energy level E(T1 S ), wherein each E B delivering energy to at least one S B , and each S B the maximum emission wavelength of the emitted light is between 500 nm and 560 nm, wherein the following relationships expressed by equations (1) to (5) apply: 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) at least one small FWHM emitter S B is a boron-containing emitter, wherein said at least one small FWHM emitter S B comprises, or consists of, one formula S B Structure of -III-3a: Formula S B -III-3a 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 independently of each other selected from hydrogen, deuterium, N(R 21 )2, OR 21 , SR 21 , Si(R 21 )3, B(OR 21 )2, OSO2R 21 , CF3, CN, halogen, C1-C 40 - alkyl, which is optionally substituted by one or more substituents R 21 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 21 C=CR 21 , C=C, Si(R 21 )2, Ge(R 21 )2, Sn(R 21 )2, C=0, C=S, C=Se, C=NR 21 , P(=0)(R 21 ), SO, S02, NR 21 , O, S or CONR 21 ; C1-C 40 - alkoxy, which is optionally substituted by one or more substituents R 21 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 21 C=CR 21 , C=C, Si(R 21 )2, Ge(R 21 )2, Sn(R 21 )2, C=0, C=S, C=Se, C=NR 21 , P(=0)(R 21 ), SO, S02, NR 21 , O, S or CONR 21 ; C1-C 40 thioalkoxy, which is optionally substituted by one or more substituents R 21 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 21 C=CR 21 , C=C, Si(R 21 )2, Ge(R 21 )2, Sn(R 21 )2, C=0, C=S, C=Se, C=NR 21 , P(=0)(R 21 ), SO, S02, NR 21 , O, S or CONR 21 ; C2-C 40 - alkenyl, which is optionally substituted by one or more substituents R 21 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 21 C=CR 21 , C=C, Si(R 21 )2, Ge(R 21 )2, Sn(R 21 )2, C=0, C=S, C=Se, C=NR 21 , P(=0)(R 21 ), SO, S02, NR 21 , O, S or CONR 21 ; C2-C 40 - alkenyl, which is optionally substituted by one or more substituents R 21 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 21 C=CR 21 , C=C, Si(R 21 )2, Ge(R 21 )2, Sn(R 21 )2, C=0, C=S, C=Se, C=NR 21 , P(=0)(R 21 ), SO, S02, NR 21 , O, S or CONR 21 ; C6-C 60 - aryl, which is optionally substituted by one or more substituents R 21 substituted; and C3-C 57 heteroaryl, which is optionally substituted by one or more substituents R 21 substituted; wherein one or more pairs of adjacent groups in 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 are optionally joined to form an aromatic ring system, which is fused to the adjacent phenyl ring a, b, c or d of formula S B -III-3a and is optionally substituted by one or more substituents R 21 ; wherein in R VI and R XXIII , R XIII and R XIV are optionally one or both pair is linked to form a group Z 4 which at each occurrence is independently selected from the group consisting of: a direct bond, CR 22 R 23 , C=CR 22 R 23 , C=O, C=NR 22 , NR 22 , O, SiR 22 R 23 , S, S(O) and S(O)2; R 21 is independently at each occurrence selected from the group consisting of hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(Ci-C5-alkyl)3, Si(Ph)3, C1-C5-alkyl, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C1-C5-alkoxy, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C1-C5-thioalkoxy, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C2-C5-alkenyl, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C2-C5-alkynyl, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C6-C 18 - aryl, which is optionally substituted by one or more C1-C5-alkyl substituents; C3-C 17 heteroaryl, which is optionally substituted by one or more C1-C5-alkyl substituents; N(C6-C 18 -aryl)2, N(C3-C 17 - heteroaryl)2, and N(C3-C 17 - heteroaryl) (C6-C 18 - aryl); R 22 and R 23 are at each occurrence independently from each other selected from the group consisting of: hydrogen, deuterium, N(R 24 )2, OR 24 , Si(R 24 )3, B(OR 24 )2, OSO2R 24 , CF3, CN, F, Br, I, C1-C 40 - alkyl, which is optionally substituted by one or more substituents R 24 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 24 C=CR 24 , C=C, Si(R 24 )2, Ge(R 24 )2, Sn(R 24 )2, C=0, C=S, C=Se, C=NR 24 , P(=0)(R 24 ), SO, S02, NR 24 , O, S or CONR 24 ; C1-C 40 - alkoxy, which is optionally substituted by one or more substituents R 24 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 24 C=CR 24 , C=C, Si(R 24 )2, Ge(R 24 )2, Sn(R 24 )2, C=0, C=S, C=Se, C=NR 24 , P(=0)(R 24 ), SO, S02, NR 24 , O, S or CONR 24 ; C1-C 40 thioalkoxy, which is optionally substituted by one or more substituents R 24 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 24 C=CR 24 , C=C, Si(R 24 )2, Ge(R 24 )2, Sn(R 24 )2, C=0, C=S, C=Se, C=NR 24 , P(=0)(R 24 ), SO, S02, NR 24 , O, S or CONR 24 ; C2-C 40 - alkenyl, which is optionally substituted by one or more substituents R 24 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 24 C=CR 24 , C=C, Si(R 24 )2, Ge(R 24 )2, Sn(R 24 )2, C=0, C=S, C=Se, C=NR 24 , P(=0)(R 24 ), SO, S02, NR 24 , O, S or CONR 24 ; C2-C 40 - alkenyl, which is optionally substituted by one or more substituents R 24 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 24 C=CR 24 , C=C, Si(R 24 )2, Ge(R 24 )2, Sn(R 24 )2, C=0, C=S, C=Se, C=NR 24 , P(=0)(R 24 ), SO, S02, NR 24 , O, S or CONR 24 ; C6-C 60 - aryl, which is optionally substituted by one or more substituents R 24 substituted, and C3-C 57 heteroaryl, which is optionally substituted by one or more substituents R 2 substituted; R 24 is independently at each occurrence selected from the group consisting of hydrogen, deuterium, OPh, SPh, CF3, CN, F, Si(Ci-C5-alkyl)3, Si(Ph)3, C1-C5-alkyl, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C1-C5-alkoxy, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C1-C5-thioalkoxy, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C2-C5-alkenyl, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C2-C5-alkynyl, wherein optionally one or more hydrogen atoms are independently of each other substituted by deuterium, CN, CF3 or F; C6-C 18 - aryl, which is optionally substituted by one or more C1-C5-alkyl substituents; C3-C 17 heteroaryl, which is optionally substituted by one or more C1-C5-alkyl substituents; N(C6-C 18 -aryl)2, N(C3-C 17 - heteroaryl)2, and N(C3-C 17 - heteroaryl) (C6-C 18 - aryl); R A selected from the group consisting of hydrogen, C3-C 15 - Heteroaryl, wherein one or more hydrogen atoms are independently dilated by deuterium, halogen, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), C3-C 15 - Heteroaryl substitution, and C6-C 18 - aryl, wherein optionally one or more hydrogen atoms are independently from each other substituted by Ci-C5-alkyl, CN, CF3and Ph; and C6-C 18 - aryl, wherein optionally one or more hydrogen atoms are independently from each other replaced by a substituent selected from the group consisting of Ci-C5-alkyl, CN, CF3, and Ph, which is optionally substituted by one or more substituents independently of each other selected from Me, i Pr, t Bu, CN, CF3and Ph, pyridyl, which is optionally substituted with one or more substituents independently selected from Me, i Pr, t Bu, CN, CF3, and Ph, pyrimidinyl, which is optionally substituted with one or more substituents independently selected from Me, i Pr, t Bu, CN, CF3, and Ph, and a triazine group, which is optionally substituted with one or more substituents independently of one another selected from the group consisting of Me, i Pr, t Bu, CN, CF3and Ph.

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

3. The organic electroluminescent device according to any of claims 1 and 2, wherein the at least one small full width at half maximum (FWHM) emitter S B characterized in that its emission spectrum exhibits a full width at half maximum (FWHM) value of less than or equal to 0.25 eV.

4. The organic electroluminescent device according to any one of claims 1 or 2, wherein the at least one thermally activated delayed fluorescence (TADF) material E B has an emission maximum λ max (D).

5. The organic electroluminescent device according to any of claims 1 or 2, wherein the at least one thermally activated delayed fluorescence (TADF) material E B has the highest occupied molecular orbital HOMO (E B ) with an energy E HOMO (E B ) of -6.0 eV ≤ E HOMO (E B ) ≤ -5.8 eV.

6. The organic electroluminescent device according to any one of claims 1 or 2, wherein the at least one thermally activated delayed fluorescence (TADF) material E B having the structure of any one of B -I-1 a, 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 wherein Y 1 is nitrogen (N) or CH at each occurrence, and at least one Y 1 is N; m is independently at each occurrence 0, 1 or 2; n is, at each occurrence, independently of each other 0, 1 or 2; p is, at each occurrence, independently of each other 0, 1 or 2; q is, at each occurrence, independently of each other 0, 1 or 2; X 2 independently of each other at each occurrence are selected from Ar EWG , CN and CF3; Ar EWG independently of each other at each occurrence are selected from the structures represented by any of the following formulae: 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, Ar EWG - XIII and Ar EWG - XIV, which is bound to the core structure at the position marked by the dotted line; R Z1 independently from each other at each occurrence are selected from CN and CF3; Z 3 independently from each other at each occurrence are selected from the group consisting of a direct bond, CR 9 R 10 , C=CR 9 R 10 , C=O, C=NR 9 , NR 9 , O, SiR 9 R 10 , S, S(O) and S(O)2; R 8 at each occurrence, is independently selected from the group consisting of: hydrogen, deuterium, CN, CF3, C1-C5-alkyl, wherein one or more hydrogen atoms are optionally substituted by deuterium; C6-C 18 - aryl, which is optionally substituted by one or more substituents R 11 substituted; and C3-C 17 heteroaryl, which is optionally substituted by one or more substituents R 11 substituted; R b , R c , R d , R 9 and R 10 are at each occurrence independently from each other selected from the group consisting of: hydrogen, deuterium, N(R 12 )2, OR 12 , Si(R 12 )3, B(OR 12 )2, OSO2R 12 , CF3, CN, F, Br, I, C1-C 40 - alkyl, which is optionally substituted by one or more substituents R 12 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted with C=0, C=S, C=NR 12 , P(=0)(R 12 ), SO, SO2, NR 12 , O, S or CONR 12 ; C1-C 40 - alkoxy, which is optionally substituted by one or more substituents R 12 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 12 C=CR 12 , C=C, Si(R 12 )2, Ge(R 12 )2, Sn(R 12 )2, C=0, C=S, C=Se, C=NR 12 , P(=0)(R 12 ), SO, S02, NR 12 , O, S or CONR 12 ; C1-C 40 thioalkoxy, which is optionally substituted by one or more substituents R 12 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 12 C=CR 12 , C=C, Si(R 12 )2, Ge(R 12 )2, Sn(R 12 )2, C=0, C=S, C=Se, C=NR 12 , P(=0)(R 12 ), SO, S02, NR 12 , O, S or CONR 12 ; C2-C 40 - alkenyl, which is optionally substituted by one or more substituents R 12 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 12 C=CR 12 , C=C, Si(R 12 )2, Ge(R 12 )2, Sn(R 12 )2, C=0, C=S, C=Se, C=NR 12 , P(=0)(R 12 ), SO, S02, NR 12 , O, S or CONR 12 ; C2-C 40 - alkenyl, which is optionally substituted by one or more substituents R 12 substituted, and wherein one or more non-adjacent CH2-groups are optionally substituted by R 12 C=CR 12 , C=C, Si(R 12 )2, Ge(R 12 )2, Sn(R 12 )2, C=0, C=S, C=Se, C=NR 12 , P(=0)(R 12 ), SO, S02, NR 12 , O, S or CONR 12 ; C6-C 60 - aryl, which is optionally substituted by one or more substituents R 12 substituted, and C3-C 57 heteroaryl, which is optionally substituted by one or more substituents R 12 ; R 11 independently from each other at each occurrence are selected from the group consisting of: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3and phenyl, which is optionally substituted by one or more substituents, independently selected from the group consisting of Me, Et, n-Bu, i-Bu, t-Bu, OH, OMe, OEt, Oi-Pr, Oi-Bu, O-t-Bu, OPh, CN, CF3, and Ph; i Pr, t Bu, CN, CF3, and Ph; R 12 is at each occurrence independently selected from the group consisting of: hydrogen, deuterium, OPh, CF3, CN, F, C1-C5-alkyl, wherein one or more hydrogen atoms are optionally independently of each other substituted by deuterium, CN, CF3 or F; C1-C5-alkoxy, wherein one or more hydrogen atoms are optionally independently of each other substituted by deuterium, CN, CF3 or F; C1-C5-thioalkoxy, wherein one or more hydrogen atoms are optionally independently of each other substituted by deuterium, CN, CF3 or F; C2-C5-alkenyl, wherein one or more hydrogen atoms are optionally independently of each other substituted by deuterium, CN, CF3 or F; C2-C5-alkynyl, wherein one or more hydrogen atoms are optionally independently of each other substituted by deuterium, CN, CF3 or F; C6-C 18 - aryl, which is optionally substituted by one or more C1-C5-alkyl substituents; C3-C 17 heteroaryl, which is optionally substituted by one or more C1-C5-alkyl substituents; N(C6-C 18 -aryl)2, N(C3-C 17 - heteroaryl)2, N(C3-C 17 - heteroaryl) (C6-C 18 - aryl), and aliphatic cyclic amino comprising 5 to 8 carbon atoms; R 13 is at each occurrence independently from one occurrence to the next selected from the group consisting of: hydrogen, deuterium, CN, CF3, Ar EWG , C1-C5-alkyl, wherein one or more hydrogen atoms are optionally substituted by deuterium; C6-C 18 - aryl, which is optionally substituted by one or more groups independently selected, for each other group, from deuterium, Ci-C5-alkyl and C6-Ci0-aryl; 18 - a substituent of a substituent of aryl; and R 14 and R 15 are at each occurrence independently of each other selected from C-Ar EWG and CR Q2 ; R 16 are at each occurrence independently from each other selected from CR 6 , C-Ar EWG and CR Q2 ; R Q2 independently from each other at each occurrence are selected from the group consisting of: hydrogen, deuterium, Me, i Pr, t Bu, CN, CF3, Ph and a carbazolyl group, which is optionally substituted by one or more substituents independently of each other selected from the group consisting of Me, i Pr, t Bu, CN, CF3, Ph and N(Ph)2; wherein Optionally, any adjacent substituents R b , R c , R d , R 9 and R 10 independently of one another form a monocyclic or polycyclic, aliphatic, aromatic and / or benzo-fused ring system; wherein one or more hydrogen atoms of the ring system thus formed are replaced by R 12 ; and wherein no more than two groups R 13 are CN, CF3, or Ar EWG ; wherein: 1 < (m + p) and < (n + q).

7. The organic electroluminescent device according to claim 1, wherein R A is C3-C 15 -heteroaryl, wherein Optionally, one or more hydrogen atoms are independently converted to deuterium, halogen, C1-C5-alkyl, CN, CF3, SiMe3, SiPh3 (Ph = phenyl), C3-C 15 - Heteroaryl and C6-C 18 -Aryl substitution.

8. The organic electroluminescent device according to claim 7, wherein formula S B - R of III-3a A - one of the carbon atoms is C3-C 15 - one of the carbon atoms is C3-C 15 - one of the carbon atoms is C3-C 9. The organic electroluminescent device according to claim 1, R A is C3-C 15 -heteroaryl, wherein optionally one or more hydrogen atoms independently of each other are substituted by Ci-C5-alkyl, CN, CF3and Ph.

10. The organic electroluminescent device according to any of claims 1 or 2, comprising one or more p-host materials H P having a lowest unoccupied molecular orbital LUMO(H LUMO ) with an energy E P (H P ) which is greater than or equal to -2.6 eV. LUMO (H P ).

11. The organic electroluminescent device according to any of claims 1 or 2, comprising one or more p- host materials H P comprising or consisting of: -- a first chemical moiety comprising, or consisting of, 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 - any of structures: and -- at least one second chemical moiety comprising, or consisting of, Any of the structures of 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 each of the at least one second chemical moieties present in the p- host material H P is connected to the first chemical moiety by a single bond, which is represented by a dashed line in the above formula; wherein Z 1 independently from each other at each occurrence are selected from a direct bond, C(R II )2, C=C(R II )2, C=0, C=NR II , NR II , O, Si(R II )2, S, S(O) and S(0)2; R I independently at each occurrence, is a binding site of a single bond connecting the first chemical moiety and the 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 binding site of a single bond connecting the first chemical moiety and the second chemical moiety, and Ph, which is optionally substituted with one or more substituents each independently selected from the group consisting of Me, i Pr, t Bu and Ph; R II at each occurrence is independently selected from the group consisting of: hydrogen, deuterium, Me, i Pr, t Bu and Ph, which is optionally substituted with one or more substituents each independently selected from the group consisting of Me, i Pr, t Bu and Ph; wherein two or more adjacent substituents R II optionally form an aromatic or heteroaromatic ring system having 3-18 carbon atoms.

12. The organic electroluminescent device according to any of claims 1 or 2, wherein the organic electroluminescent device is a device selected from the group consisting of organic light emitting diodes, light emitting electrochemical cells and light emitting transistors.

13. The organic electroluminescent device according to any one of claims 1 or 2, wherein, The 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) 0-79.9% by weight of one or more n-host compounds H N ; (iii) 10-50% by weight of one or more TADF materials E B ; and (iv) 0.1-10% by weight of one or more small FWHM emitters S B ; and (v) 0 to 72 % by weight of one or more solvents.

14. The organic electroluminescent device according to any of claims 1 or 2, wherein the at least one light-emitting layer B comprises: (i) 22-87.5 wt% of one or more host compounds H P ; (ii) 0 - 65.5 wt.-% of one or more n-host compounds H N ; (iii) 12-40% by weight of one or more TADF materials B ; and (iv) 0.5-5% by weight of one or more small FWHM emitters S B ; and (v) 0 to 65.5 % by weight of one or more solvents.

15. A method of generating green light having a wavelength of 500 nm to 560 nm, comprising the following steps: (i) providing an organic electroluminescent device according to any of claims 1 or 2; and (ii) applying a current to the organic electroluminescent device.

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