Electroluminescent material and organic electroluminescent device comprising same

Abstract

Provided in the present disclosure are an electroluminescent material and an organic electroluminescent device comprising same. The electroluminescent material comprises a combination of a first compound and a second compound, wherein the first compound has a structure shown as formula I, and the second compound has a structure shown as formula II. The structural design and compounding of the first compound and the second compound cooperatively improve the carrier transport performance, such that the electroluminescent material has excellent photoelectric properties and can achieve balanced carrier transport. The electroluminescent material can be used in organic electroluminescent devices and is especially suitable for use in light-emitting layers. The electroluminescent material, as a high-performance dual-host material, endows the organic electroluminescent devices to have significantly improved light-emitting efficiency and significantly improved overall device performance.

Description

An electroluminescent material and an organic electroluminescent device comprising the same. Technical Field

[0001] This disclosure belongs to the field of organic electroluminescence technology, specifically relating to an electroluminescent material and an organic electroluminescent device containing the same. Background Technology

[0002] In recent years, optoelectronic devices based on organic materials have become increasingly popular. The inherent flexibility of organic materials makes them ideal for fabrication on flexible substrates, allowing for the design and production of aesthetically pleasing and stylish optoelectronic products, offering unparalleled advantages over inorganic materials. Examples of such organic optoelectronic devices include organic light-emitting diodes (OLEDs), organic field-effect transistors, organic photovoltaic cells, and organic sensors; among them, OLEDs have developed particularly rapidly and have already achieved commercial success in the field of information display. OLEDs can provide highly saturated red, green, and blue colors, and full-color displays made with them do not require an additional backlight, offering advantages such as vibrant colors, thinness, and flexibility.

[0003] The core of an OLED device is a thin-film structure containing various organic functional materials. Common organic functional materials include: hole injection materials, hole transport materials, hole blocking materials, electron injection materials, electron transport materials, electron blocking materials, light-emitting host materials, and light-emitting guest materials (dyes). When the device is powered on, electrons and holes are injected and transported to the light-emitting region, where they recombine, thereby generating excitons and emitting light.

[0004] Currently, various organic materials have been developed and combined with different device structures to improve carrier mobility, regulate carrier balance, break through electroluminescence efficiency, and delay device decay. According to the light-emitting mechanism, OLED devices can be mainly divided into fluorescence, phosphorescence, thermally excited delayed fluorescence, and thermally excited sensitized fluorescence. For quantum mechanical reasons, common fluorescent emitters mainly utilize singlet excitons generated when electrons and holes combine to emit light, and are still widely used in various OLED products. Some metal complexes, such as iridium complexes, can simultaneously utilize triplet and singlet excitons to emit light, and are called phosphorescent emitters, whose energy conversion efficiency can be up to 4 times higher than that of traditional fluorescent emitters. Thermally excited delayed fluorescence (TADF) technology promotes the transition from triplet excitons to singlet excitons, achieving high luminescence efficiency without the use of metal complexes, while still effectively utilizing triplet excitons. Thermally excited sensitized fluorescence (TASF) technology uses materials with TADF properties to sensitize the emitter through energy transfer, also achieving high luminescence efficiency.

[0005] As OLED products gradually enter the market, people have increasingly higher requirements for their performance. Current OLED materials and device structures cannot fully address the issues related to efficiency, lifespan, and cost of OLED products. Therefore, there is an urgent need in this field to develop more diverse and higher-performance organic materials to further improve the luminescent performance of devices. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present disclosure aims to provide an electroluminescent material and an organic electroluminescent device containing the same. Through the structural design of the first compound and the second compound and their mutual compounding, the electroluminescent material possesses excellent carrier transport characteristics. When used in an organic electroluminescent device, it can significantly improve the luminous efficiency of the device.

[0007] To achieve this objective, the present disclosure adopts the following technical solution:

[0008] In a first aspect, this disclosure provides an electroluminescent material comprising a combination of a first compound and a second compound; the first compound having a structure as shown in Formula I:

[0009] In Formula I, Ar1 is selected from Any one of them, —* represents the linking site of the group.

[0010] In Formula I, Ar2 is selected from any one of the substituted or unsubstituted C6-C30 aryl groups.

[0011] R1, R2, R3, R4, R5, and R6 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C30 straight-chain or branched alkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted tri(C1-C30 alkyl)silyl, substituted or unsubstituted di(C1-C30 alkyl)(C6-C30 aryl)silyl, substituted or unsubstituted (C1-C30 alkyl)di(C6-C30 aryl)silyl, substituted or unsubstituted tri(C6-C30 aryl)silyl, substituted or unsubstituted C1-C30 alkylamino, substituted or unsubstituted C2-C3 The amino group comprises any one of the following: alkenylamino, substituted or unsubstituted (C1-C30 alkyl)(C2-C30 alkenyl)amino, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted (C1-C30 alkyl)(C6-C30 aryl)amino, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted (C1-C30 alkyl)(C3-C30 heteroaryl)amino, substituted or unsubstituted (C2-C30 alkenyl)(C6-C30 aryl)amino, substituted or unsubstituted (C2-C30 alkenyl)(C3-C30 heteroaryl)amino, substituted or unsubstituted (C6-C30 aryl)(C3-C30 heteroaryl)amino; wherein at least two adjacent groups of R1, R2, R3, R4, R5, and R6 are not connected or are linked by chemical bonds to form a ring.

[0012] In this disclosure, "at least two adjacent groups among R1, R2, R3, R4, R5, and R6 are not connected" means that the group is only connected to the C atom by a single bond; "at least two adjacent groups among R1, R2, R3, R4, R5, and R6 are connected to form a ring by chemical bonds" means that in addition to being connected to the C atom by chemical bonds, adjacent groups are also connected by chemical bonds, thereby forming a fused ring structure. The same descriptions will have the same meaning in the following text and will not be repeated hereafter.

[0013] In Formula I, a, b, c, and f represent the number of substituents R1, R2, R3, and R6, respectively; d and h represent the number of substituents R4; and e and g represent the number of substituents R5. a is an integer selected from 0 to 2, for example, 0, 1, or 2. b, c, d, and e are each independently selected from 0 to 4, for example, 0, 1, 2, 3, or 4. f and g are each independently selected from 0 to 5, for example, 0, 1, 2, 3, 4, or 5. h is an integer selected from 0 to 3, for example, 0, 1, 2, or 3.

[0014] It should be noted that when a is 0, it indicates that there are no substituents on the corresponding benzene ring, and all two sites on the benzene ring are hydrogen atoms; when a = 2, the two R1 groups are the same or different groups. When b is 0, it indicates that there are no substituents on the corresponding benzene ring, and all four sites on the benzene ring are hydrogen atoms; when b ≥ 2, multiple (at least two) R2 groups are the same or different groups; c is similar to b. When d is 0, it indicates that there are no other substituents on the corresponding benzene ring, and all four sites on the benzene ring are hydrogen atoms; when d ≥ 2, multiple (at least two) R4 groups are the same or different groups. The expressions for e, f, g, and h are similar, and for the sake of brevity, they will not be repeated. Similar descriptions in the following text have similar meanings.

[0015] The second compound has the structure shown in Formula II:

[0016] In Equation II, X is O or S.

[0017] In Formula II, Ar3 and Ar4 are each independently selected from any one of substituted or unsubstituted C6-C30 aryl groups and substituted or unsubstituted C3-C30 heteroaryl groups.

[0018] In Formula II, L is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene, or a substituted or unsubstituted C3-C30 heteroarylene; when L is a single bond, it represents that the N of the triazine ring and the carbazole group are directly connected by a single bond.

[0019] In Formula II, R7, R8, and R9 are each independently selected from any one of deuterium, halogen, substituted or unsubstituted C1-C20 straight-chain or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C30 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C1-C20 alkylthio, substituted or unsubstituted C6-C30 arylthio, and substituted or unsubstituted C6-C30 arylamino; at least two adjacent groups in R7, R8, and R9 are not connected or are linked by chemical bonds to form a ring.

[0020] In Formula II, m, n, and p represent the number of substituents R7, R9, and R8, respectively; m and n are each independently selected from integers from 0 to 4, for example, they can be 0, 1, 2, 3, or 4; p is selected from integers from 0 to 2, for example, it can be 0, 1, or 2.

[0021] It should be noted that when m is 0, it means that there are no other substituents on the corresponding benzene ring, and all four sites on the benzene ring are hydrogen atoms; when m ≥ 2, multiple (at least two) R7 groups are the same or different groups; the same applies to n and m. When p is 0, it means that there are no other substituents on the corresponding benzene ring, and all two sites on the benzene ring are hydrogen atoms; when p = 2, the two R8 groups are the same or different groups.

[0022] The substituents in Ar2, Ar3, Ar4, L, R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently selected from any one or a combination of at least two of the following: deuterium, halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight-chain or branched alkyl, C1-C20 alkoxy, C2-C20 alkenyl, C3-C20 cycloalkyl, C2-C20 heterocycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, C3-C30 arylamino, and C3-C30 heteroarylamino. The substituents may optionally be substituted with deuterium.

[0023] In this disclosure, the term "substituted or unsubstituted" may replace one substituent or multiple substituents. When there are multiple substituents (at least two), they may be the same or different substituents. The same expressions used below have the same meaning. Unless otherwise specified, the range of substituent selection is as shown above and will not be repeated.

[0024] The electroluminescent material disclosed herein comprises a combination of a first compound and a second compound. The structure of the first compound is shown in Formula I, containing a fused structure of indole-carbazole, with a terphenyl group Ar1 attached to one N atom in the fused structure. Through molecular structure design, the first compound possesses a high spatial packing structure, effectively regulating the injection and transport of holes within the luminescent layer, thereby controlling the carrier recombination region in the luminescent layer. The structure of the second compound is shown in Formula II, containing a fused ring structure of benzofuran / benzothiophene and carbazole, with the N atom connected to a triazine structure via an L atom. This gives the second compound excellent electron transport performance, promoting a balance between electron and hole transport within the luminescent layer. This disclosure, through the structural design and mutual compounding of two types of compounds with specific structures, synergistically enhances carrier transport performance, giving the electroluminescent material excellent photoelectric properties and enabling balanced carrier transport. When used in organic electroluminescent devices, it is particularly suitable for the luminescent layer, serving as a high-performance dual-host material, significantly improving device efficiency and overall luminescent performance.

[0025] It should be noted that, for the convenience of description in the present disclosure, the possible functions of each group / feature of the first compound and the second compound are separately described. However, this does not mean that these groups / features act independently. In fact, the reason for obtaining good performance is essentially the optimized design of the entire molecular structure, which is the result of the synergistic effect between each group and the two types of compounds, rather than the effect of a single group.

[0026] The following are the preferred technical solutions of the present disclosure, but do not limit the technical solutions provided by the present disclosure. Through the following preferred technical solutions, the objectives and beneficial effects of the present disclosure can be better achieved and realized.

[0027] In the present disclosure, for the expression of chemical elements, unless otherwise specified, the concept of isotopes with the same chemical properties is included. For example, hydrogen (H) includes 1 H (protium), 2 H (deuterium, D), 3 H (tritium, T), etc.; carbon (C) includes 12 C, 13 C, etc.

[0028] In the present disclosure, the hydrogen at any site in the first compound may optionally be replaced by deuterium, and the hydrogen at any site in the second compound may optionally be replaced by deuterium.

[0029] In the present disclosure, the halogen may all be fluorine, chlorine, bromine or iodine. The same description hereinafter has the same meaning.

[0030] In the present disclosure, unless otherwise specified, the heteroatoms of heteroaryl are selected from N, O, S, P, B, Si or Se, preferably N, O or S. The heteroatoms of heterocycloalkyl are selected from N, O, S, P, B, Si or Se, preferably N, O or S.

[0031] In the present disclosure, the expression of the ring structure with a "-" drawn across it indicates that the connection site is at any position on the ring structure where bonding can occur.

[0032] In the present disclosure, both "——*" and "*" represent the connection sites of groups.

[0033] In the present disclosure, the expression Ca-Cb represents that the group has a carbon atom number of a - b. Unless otherwise specified, the carbon atom number does not include the carbon atom number of substituents.

[0034] In the present disclosure, "each independently" means that when its subject has multiple ones, they can be the same or different from each other.

[0035] In this disclosure, C6-C30 can all be C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0036] C3-C30 can all be C3, C4, C5, C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0037] C1-C30 can all be C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C20, C22, C24, C26 or C28, etc.

[0038] C2-C30 can all be C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C20, C22, C24, C26 or C28, etc.

[0039] C1-C20 can all be C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0040] C3-C20 can all be C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0041] C2-C20 can all be C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0042] In this disclosure, the C6-C30 aryl group, preferably C6-C20 aryl group, includes monocyclic aryl and fused-ring aryl groups; the monocyclic aryl group means that the group contains at least one phenyl group, and when it contains at least two phenyl groups, the phenyl groups are linked by single bonds, including but not limited to: phenyl, biphenyl, terphenyl, tetraphenyl, etc. The term "fused-ring aryl" refers to a group containing at least two aromatic rings, wherein the aromatic rings share two adjacent carbon atoms fused together. Exemplary examples include, but are not limited to: naphthyl (1-naphthyl, 2-naphthyl), anthraceneyl (1-anthrayl, 2-anthrayl, 9-anthrayl), phenanthryl, indene, fluorenyl and their derivatives (9,9-dimethylfluorenyl, 9,9-diethylfluorenyl, 9,9-dipropylfluorenyl, 9,9-dibutylfluorenyl, 9,9-dipentylfluorenyl, 9,9-dihexylfluorenyl, 9,9-diphenylfluorenyl, 9,9-dinaphthylfluorenyl, phenylmethylfluorenyl, spirodifluorenyl, benzo[a]fluorenyl, etc.), fluoranyl, triphenylene, pyrene (1-pyrene, 2-pyrene, 4-pyrene), peryl, Aryl groups include aryl groups, pheno-tetraphenyl (1-pheno-tetraphenyl, 2-pheno-tetraphenyl, 9-pheno-tetraphenyl), etc. It should be noted that monocyclic aryl groups and fused-ring aryl groups linked by single bonds also fall under the aryl group category, such as phenylnaphthyl, naphthylphenyl, phenylnaphthylphenyl, binaphthyl, etc.

[0043] The C3-C30 heteroaryl group, preferably a C3-C20 heteroaryl group, includes monocyclic heteroaryl groups or fused-ring heteroaryl groups. A monocyclic heteroaryl group means that the molecule contains at least one heteroaryl group. When the molecule contains one heteroaryl group and other groups (such as aryl, heteroaryl, etc.), the heteroaryl group and other groups are connected by a single bond, exemplarily including but not limited to: pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, furanyl, thiophene, pyrroleyl, bipyridinyl, phenylpyridinyl, pyridylphenyl, pyrimidinylphenyl, etc. The term "fused-ring heteroaryl" refers to a molecule containing at least one aromatic heterocycle and one aromatic ring (aromatic heterocycle or aromatic ring), and the two share two adjacent atoms fused together in a group. Examples include, but are not limited to: quinolinyl, isoquinolinyl, quinoxolinyl, quinazolinyl, benzofuranyl, benzothiophenyl, isobenzofuranyl, isobenzothiophenyl, indolyl, dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, carbazoleyl and its derivatives (N-phenylcarbazoleyl, N-naphthylcarbazoleyl, benzocarbazoleyl, dibenzocarbazoleyl, indolocarbazoleyl, azacarbazoleyl, etc.), acridineyl, phenothiazinyl, phenotoxazinyl, hydrogenated acridineyl, etc. It should be noted that heteroaryl groups connected by single bonds, as well as aryl groups connected by single bonds, also fall under the category of heteroaryl groups, such as phenyldibenzofuranyl, phenyldibenzothiophenyl, dibenzothiophenylphenyl, dibenzofuranylphenyl, etc.

[0044] Specific examples of the C6-C30 arylene group can be exemplified by removing one hydrogen atom from the aryl group examples above, resulting in a divalent group; specific examples of the C3-C30 heteroarylene group can be exemplified by removing one hydrogen atom from the heteroaryl group examples above, resulting in a divalent group.

[0045] In this disclosure, a specific example of the C6-C30 arylamino group is a monovalent group obtained by substituting at least one hydrogen atom in -NH2 with the aforementioned aryl group. A specific example of the C6-C30 arylsilyl group is a monovalent group obtained by substituting at least one hydrogen atom in -SiH3 with the aforementioned aryl group. A specific example of the C3-C30 heteroarylamino group is a monovalent group obtained by substituting at least one hydrogen atom in -NH2 with the aforementioned heteroaryl group.

[0046] In this disclosure, the C6-C30 aryloxy group is a monovalent group formed by attaching the aforementioned aryl group to O; the C6-C30 arylthio group is a monovalent group formed by attaching the aforementioned aryl group to S.

[0047] The C1-C30 straight-chain or branched alkyl group, C1-C20 straight-chain or branched alkyl group, preferably C1-C10 straight-chain or branched alkyl group, includes, but is not limited to: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, 2-methylbutyl, n-pentyl, isopentyl, neopentyl, n-hexyl, neohexyl, 2-ethylhexyl, n-octyl, n-heptyl, n-nonyl, n-decyl, etc.

[0048] A specific example of the C1-C30 alkylsilyl group is a monovalent group formed by replacing at least one hydrogen atom in -SiH3 with the aforementioned straight-chain or branched alkyl group.

[0049] Specific examples of the C1-C20 alkoxy group can be the monovalent group obtained by connecting the above-mentioned straight-chain or branched alkyl group with O; specific examples of the C1-C20 alkylthio group can be the monovalent group obtained by connecting the above-mentioned straight-chain or branched alkyl group with S.

[0050] The C2-C30 alkenyl, C2-C20 alkenyl, preferably C2-C10 alkenyl, contains at least one C=C, and includes, but is not limited to: vinyl, propenyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, butadienyl, pentadienyl, etc.

[0051] The C3-C30 cycloalkyl, C3-C20 cycloalkyl, preferably C3-C10 cycloalkyl, includes monocycloalkyl or polycycloalkyl. Monocycloalkyl refers to an alkyl group containing a single ring structure, while polycycloalkyl refers to a structure formed by two or more cycloalkyl groups sharing one or more carbon atoms on a ring; exemplary examples include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and adamantyl.

[0052] Specific examples of the C2-C20 heterocyclic alkyl group can be exemplified by a monovalent group formed by replacing one of the ring carbon atoms in the aforementioned cycloalkyl group with a heteroatom. The heteroatom is preferably N, O, or S, and includes, but is not limited to, epoxy group, oxetane group, tetrahydrofuranyl group, tetrahydrothiophenyl group, tetrahydropyrroleyl group, tetrahydropyranyl group, piperidinyl group, piperazineyl group, dioxaneyl group, morpholinyl group, etc.

[0053] In this disclosure, the first compound has a structure as shown in Formula I-1 or Formula I-2. In one embodiment of the invention, the first compound has a structure as shown in Formula I-1:

[0054] Ar2, R1, R2, R3, R4, R5, and R6 have the same range of limitations as those mentioned above.

[0055] Preferably, the Ar2 is selected from any one of the following groups, whether substituted or unsubstituted:

[0056] In this context, —* represents the linking site of a functional group.

[0057] In one embodiment of the present invention, each of the substituents in Ar2 is independently selected from deuterium, C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight-chain or branched alkyl groups, C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl groups, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) aryl groups, and C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroaryl groups, or a combination of at least two of these groups. More preferably, deuterium, C1-C6 straight-chain or branched alkyl groups, phenyl, naphthyl, and biphenyl groups are selected from these groups. Deuterium is even more preferred.

[0058] In one embodiment of the present invention, the Ar2 is selected from any one of the following groups that are unsubstituted or deuterated: phenyl, biphenyl, terphenyl.

[0059] In one embodiment of the present invention, R1, R2, R3, R4, R5, and R6 are each independently selected from deuterium, substituted or unsubstituted C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight-chain or branched alkyl groups, substituted or unsubstituted C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl groups, and substituted or unsubstituted C6-C20 (e.g., [missing information]). Any one of aryl groups (C6, C9, C10, C12, C14, C15, C16, C18, etc.) or substituted or unsubstituted heteroaryl groups (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.), more preferably deuterium, any one of C1-C6 straight-chain or branched alkyl groups, phenyl, naphthyl, biphenyl, terphenyl, and even more preferably deuterium.

[0060] As a preferred embodiment of this disclosure, the first compound has any one of the following structures:

[0061] In the aforementioned compound structures, the number in the upper right corner of the square brackets indicates the number of D atoms in the molecular structure. For example, in P80, "D19" means that 19 H atoms in the molecular structure are replaced by D atoms. Other similar expressions are similar and will not be repeated here.

[0062] In one embodiment of the present invention, in Formula II, Ar3 and Ar4 are each independently selected from any one of the following groups, either substituted or unsubstituted:

[0063] In this context, —* represents the linking site of a functional group.

[0064] Y is selected from O, S, NR 11 or CR 12 R 13 Any one of them.

[0065] R 11 R 12 R 13 Each group is independently selected from hydrogen, deuterium, C1-C20 straight-chain or branched alkyl, C6-C30 aryl, C3-C30 heteroaryl, and C2-C20 alkenyl; the aforementioned groups may optionally be substituted with deuterium; the R 12 and R 13 They can be either not connected or linked together by chemical bonds to form a ring.

[0066] In one embodiment of the present invention, the R 11 R 12 R 13Each group is independently selected from any one of C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight-chain or branched alkyl groups, or C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl groups, and more preferably any one of C1-C6 straight-chain or branched alkyl groups, phenyl, naphthyl, biphenyl, or terphenyl groups; the aforementioned groups may optionally be substituted with deuterium.

[0067] In one embodiment of the present invention, the substituents in Ar3 and Ar4 are each independently selected from deuterium, C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight-chain or branched alkyl groups, C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl groups, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl groups, and C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16, or C18, etc.) heteroaryl groups, or combinations of at least two of these groups. More preferably, deuterium, C1-C6 straight-chain or branched alkyl groups, phenyl, naphthyl, and biphenyl groups are selected from these groups. Deuterium is even more preferred.

[0068] In one embodiment of the invention, Ar3 and Ar4 are each independently selected from any one of the following unsubstituted or deuterated groups:

[0069] —* represents the linking site of a functional group.

[0070] In one embodiment of the present invention, L is selected from any one of single-bonded, substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) arylene, and substituted or unsubstituted C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C16, C18, etc.) heteroarylene.

[0071] In one embodiment of the invention, L is selected from any one of the following groups: single bond, substituted or unsubstituted:

[0072] —* represents the linking site of a functional group.

[0073] In one embodiment of the present invention, each of the substituents described in L is independently selected from deuterium, C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight-chain or branched alkyl groups, C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl groups, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl groups, and C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16, or C18, etc.) heteroaryl groups, or a combination of at least two of these groups. More preferably, deuterium, C1-C6 straight-chain or branched alkyl groups, phenyl, naphthyl, and biphenyl groups are selected from these groups. Deuterium is even more preferred.

[0074] In one embodiment of the invention, L is selected from any one of the following groups: single bond, unsubstituted or deuterated: phenylene, biphenylene, naphthylene, pyridylene.

[0075] In one embodiment of the present invention, R7, R8, and R9 are each independently selected from any one of deuterium, halogen, substituted or unsubstituted C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight-chain or branched alkyl groups, substituted or unsubstituted C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl groups, substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) aryl groups, and substituted or unsubstituted C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroaryl groups. More preferably, deuterium, C1-C6 straight-chain or branched alkyl groups, phenyl, naphthyl, and biphenyl groups are selected, and more preferably, deuterium is selected.

[0076] As a preferred embodiment of this disclosure, the second compound has any one of the following structures:

[0077] In the aforementioned compound structures, the number in the upper right corner of the square brackets indicates the number of D atoms in the molecular structure. For example, in N113, "D15" means that 15 H atoms in the molecular structure are replaced by D atoms. Other similar expressions are similar and will not be repeated here.

[0078] In one embodiment of the present invention, the HOMO energy level of the first compound is -5.1 eV to -5.5 eV, for example, it can be -5.15 eV, -5.2 eV, -5.25 eV, -5.3 eV, -5.35 eV, -5.4 eV or -5.45 eV, etc.

[0079] In one embodiment of the present invention, the HOMO energy level of the second compound is -5.3 eV to -6 eV, for example, it can be -5.35 eV, -5.4 eV, -5.45 eV, -5.5 eV, -5.55 eV, -5.6 eV, -5.65 eV, -5.7 eV, -5.75 eV, -5.8 eV, -5.85 eV, -5.9 eV or -5.95 eV, etc.

[0080] In one embodiment of the present invention, the HOMO energy level of the first compound is greater than that of the second compound.

[0081] In one embodiment of the present invention, the mass ratio of the first compound to the second compound is (0.1-2):1, for example, it can be 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, etc., and is more preferably (0.8-1.5):1.

[0082] In a second aspect, this disclosure provides an application of the electroluminescent material as described in the first aspect, wherein the electroluminescent material is applied to an organic electronic device.

[0083] In one embodiment of the present invention, the organic electronic device includes an organic electroluminescent device, an optical sensor, a solar cell, a lighting element, an organic thin-film transistor, an organic field-effect transistor, an organic thin-film solar cell, an information tag, an electronic artificial skin sheet, a sheet-type scanner, or electronic paper.

[0084] In one embodiment of the present invention, the electroluminescent material is applied to an organic electroluminescent device.

[0085] In one embodiment of the present invention, the electroluminescent material is used as a light-emitting layer material in an organic electroluminescent device.

[0086] In one embodiment of the present invention, the electroluminescent material is used as the host material of the light-emitting layer in an organic electroluminescent device.

[0087] Thirdly, this disclosure provides an organic electroluminescent device, the organic electroluminescent device including a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode, the organic layer including the electroluminescent material as described in the first aspect.

[0088] In one embodiment of the invention, the organic layer includes a light-emitting layer, wherein the light-emitting layer includes an electroluminescent material as described in the first aspect.

[0089] In one embodiment of the present invention, the thickness of the light-emitting layer is 10-60nm, for example, it can be 12nm, 15nm, 18nm, 20nm, 22nm, 25nm, 28nm, 30nm, 32nm, 35nm, 38nm, 40nm, 42nm, 45nm, 48nm, 50nm, 52nm, 55nm or 58nm, more preferably 20-50nm, and more preferably 30-45nm.

[0090] In one embodiment of the present invention, the electroluminescent material serves as the main material of the light-emitting layer.

[0091] As a preferred technical solution of this disclosure, the electroluminescent material serves as the main material of the light-emitting layer. It is a dual-main-material system. The first compound (first main material) is a hole-type main material with excellent hole transport capability. The second compound (second main material) is bipolar and is mainly responsible for the transport of electrons in the light-emitting layer. It also has some hole transport capability. The addition of the first compound compensates for the mismatch between hole and electron transport in the second compound. The two compounds complement each other and work together to achieve a balance between hole and electron transport in the light-emitting layer, so that the organic electroluminescent device has significantly improved efficiency and other comprehensive performance.

[0092] In one embodiment of the present invention, the light-emitting layer further includes a dopant material.

[0093] In this disclosure, the term "doped material" is also referred to as "dye", "luminescent dye", or "guest material".

[0094] In one embodiment of the present invention, the doping material is a phosphorescent doping material.

[0095] In one embodiment of the present invention, the emission wavelength of the doped material is 500-650nm, for example, it can be 510nm, 520nm, 530nm, 540nm, 550nm, 560nm, 580nm, 600nm, 620nm or 640nm, and more preferably 500-550nm.

[0096] In one embodiment of the present invention, the mass of the doped material is 0.1-15% based on the mass of the electroluminescent material being 100%, for example, it can be 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, or 14%, etc.

[0097] In one embodiment of the present invention, the light-emitting layer is prepared by vacuum thermal evaporation.

[0098] In one embodiment of the present invention, the vacuum thermal evaporation method includes: premixing a first compound and a second compound to obtain the electroluminescent material; and evaporating the electroluminescent material and the doped material using a dual-source co-evaporation method to obtain the light-emitting layer.

[0099] As a preferred technical solution of this disclosure, the first compound and the second compound are premixed and then vapor-deposited, which has excellent vapor deposition stability, ensuring that the proportion of the main material changes little during the continuous vapor deposition process, thereby ensuring the stability of device performance and further improving the performance consistency in device fabrication.

[0100] In one embodiment of the present invention, the organic layer further includes a hole transport region and an electron transport region.

[0101] In one embodiment of the present invention, the hole transport region includes any one or a combination of at least two of the following: a hole injection layer, a hole transport layer, and an electron blocking layer.

[0102] In one embodiment of the present invention, the electron transport region includes any one or a combination of at least two of the electron injection layer, electron transport layer, and hole blocking layer.

[0103] In a preferred embodiment, the organic electroluminescent device (OLED device) includes a first electrode and a second electrode, and an organic layer located between the electrodes. The organic layer can be further divided into multiple regions, such as a hole transport region, a light-emitting layer, and an electron transport region; the light-emitting layer contains the electroluminescent material provided in this disclosure.

[0104] In a preferred embodiment, the organic electroluminescent device includes a first electrode, a plurality of light-emitting functional layers (organic layers), and a second electrode arranged sequentially. The organic layers include a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer arranged sequentially, with the hole injection layer in contact with the first electrode (anode). The organic layer (preferably the light-emitting layer) comprises the electroluminescent material provided in this disclosure.

[0105] In a preferred embodiment, a substrate can be used below the first electrode or above the second electrode. The substrate is typically made of glass or polymer material possessing excellent mechanical strength, thermal stability, water resistance, and transparency. Furthermore, the substrate used for a display may also incorporate thin-film transistors (TFTs).

[0106] The first electrode can be formed by sputtering or depositing the material to be used as the first electrode on a substrate. When the first electrode is used as the anode, it can be a transparent conductive oxide material such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO2), zinc oxide (ZnO), or any combination thereof. When the first electrode is used as the cathode, it can be a metal or alloy such as magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), ytterbium (Yb), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), or any combination thereof.

[0107] Organic layers can be formed on electrodes using methods such as vacuum thermal evaporation, spin coating, and printing. The compounds used as organic layers can be small organic molecules, large organic molecules, or polymers, as well as combinations thereof.

[0108] The hole transport region is located between the anode and the emissive layer. The hole transport region can be a single-layer hole transport layer (HTL), including single-layer hole transport layers containing only one compound and single-layer hole transport layers containing multiple compounds. Alternatively, the hole transport region can be a multilayer structure including at least one of a hole injection layer (HIL), a hole transport layer (HTL), and an electron blocking layer (EBL); wherein the HIL is located between the anode and the HTL, and the EBL is located between the HTL and the emissive layer.

[0109] The material for the hole transport region may be selected from, but is not limited to, phthalocyanine derivatives such as CuPc, conductive polymers or polymers containing conductive dopants such as polyphenylene ethylene, polyaniline / dodecylbenzenesulfonic acid (Pani / DBSA), poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate) (PEDOT / PSS), polyaniline / camphorsulfonic acid (Pani / CSA), polyaniline / poly(4-styrenesulfonate) (Pani / PSS), aromatic amine derivatives, wherein the aromatic amine derivatives include compounds shown in HT-1 to HT-51 below; or any combination thereof.

[0110] The hole injection layer is located between the anode and the hole transport layer. The hole injection layer can be a single compound material or a combination of multiple compounds. For example, the hole injection layer can be one or more compounds of HT-1 to HT-51 described above, or one or more compounds of HI-1 to HI-3 described below; it can also be one or more compounds of HT-1 to HT-51 doped with one or more compounds of HI-1 to HI-3 described below.

[0111] The light-emitting layer includes a host material (the electroluminescent material provided in this disclosure) and light-emitting dyes (i.e., dopants) capable of emitting different wavelengths of light. The light-emitting layer can also be a monochromatic light-emitting layer emitting a single color such as red, green, or blue. Multiple monochromatic light-emitting layers of different colors can be arranged in a planar pattern according to pixel design, or they can be stacked together to form a colored light-emitting layer. When different colored light-emitting layers are stacked together, they can be separated from each other or connected to each other. The light-emitting layer can also be a single colored light-emitting layer capable of simultaneously emitting different colors such as red, green, and blue.

[0112] Depending on the technology used, the light-emitting layer material can be phosphorescent photoluminescent material. An OLED device can employ a single light-emitting technology or a combination of different light-emitting technologies. These different light-emitting materials, categorized by technology, can emit light of the same color or different colors.

[0113] In a preferred embodiment of this disclosure, the material of the light-emitting layer is a phosphorescent host material, which is an electroluminescent material provided in this disclosure, comprising a combination of a first compound (structure shown in Formula I) and a second compound (structure shown in Formula II). The emission wavelength of the phosphorescent doped material is 500-650 nm, preferably 500-550 nm.

[0114] In one aspect of this disclosure, the light-emitting layer employs phosphorescent photoluminescence technology. The phosphorescent doping material of the light-emitting layer may be selected from, but is not limited to, one or more combinations of GPD-1 to GPD-60 listed below.

[0115] Where D represents deuterium.

[0116] In one aspect of this disclosure, the light-emitting layer employs phosphorescent photoluminescence technology. The phosphorescent doping material of the light-emitting layer may be selected from, but not limited to, one or more combinations of RPD-1 to RPD-28 listed below.

[0117] In one aspect of this disclosure, the light-emitting layer employs phosphorescent photoluminescence technology. The phosphorescent doping material of the light-emitting layer may be selected from, but is not limited to, one or more combinations of YPD-1 to YPD-11 listed below.

[0118] The organic layer may further include an electron transport region between the light-emitting layer and the cathode. The electron transport region can be a single-layer electron transport layer (ETL), including single-layer electron transport layers containing only one compound and single-layer electron transport layers containing multiple compounds. Alternatively, the electron transport region can be a multilayer structure including at least one of an electron injection layer (EIL), an electron transport layer (ETL), and a hole blocking layer (HBL); wherein the HBL is located between the light-emitting layer and the ETL, and the EIL is located between the cathode and the ETL.

[0119] In one aspect of this disclosure, the electron transport layer material may be selected from, but not limited to, one or more combinations of ET-1 to ET-73 listed below.

[0120] In one aspect of this disclosure, a hole blocking layer (HBL) is located between the electron transport layer and the light-emitting layer. The hole blocking layer may employ one or more compounds of ET-1 to ET-73 described above.

[0121] The device may also include an electron injection layer located between the electron transport layer and the cathode. The electron injection layer material includes, but is not limited to, one or more combinations of the following: LiQ, LiF, NaCl, CsF, Li2O, Cs2CO3, BaO, Na, Li, Ca, Mg, Yb.

[0122] Fourthly, this disclosure provides a display device, the display device including the organic electroluminescent device as described in the third aspect.

[0123] In one embodiment of the present invention, the display device includes a display screen or a display panel.

[0124] This disclosure also provides an electronic device, which includes the aforementioned display device.

[0125] Compared with the prior art, this disclosure has the following beneficial effects:

[0126] The electroluminescent material provided in this disclosure, through the structural design and mutual compounding of the first compound and the second compound, synergistically enhances the carrier transport performance, giving the electroluminescent material excellent photoelectric properties and enabling balanced carrier transport. When used in organic electroluminescent devices, it is particularly suitable for the light-emitting layer, serving as a high-performance dual-host material, resulting in significantly improved luminous efficiency and markedly enhanced overall device performance. Attached Figure Description

[0127] Figure 1 is a schematic diagram of the structure of an organic electroluminescent device provided in a specific embodiment of this disclosure;

[0128] Among them, 1-substrate, 2-anode, 3-hole injection layer, 4-hole transport layer, 5-electron blocking layer, 6-light emitting layer, 7-hole blocking layer, 8-electron transport layer, 9-electron injection layer, 10-cathode, 11-external power supply. Detailed Implementation

[0129] The technical solutions of this disclosure will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this disclosure and should not be construed as specific limitations thereof.

[0130] In one specific embodiment, the first compound and the second compound can be prepared by methods disclosed in the prior art; for example, the preparation of the compounds can refer to the contents disclosed in the prior art such as CN110785863A, CN106233489A, and TW202246240A.

[0131] Example 1

[0132] An electroluminescent material comprising a first compound P1 and a second compound N4, wherein the mass ratio of P1 to N4 is 6:4.

[0133] An organic electroluminescent device includes the electroluminescent material provided in this embodiment. The structural schematic diagram of the device is shown in Figure 1. It includes a substrate 1 (glass substrate), an anode 2 (ITO), a hole injection layer 3, a hole transport layer 4, an electron blocking layer 5, a light-emitting layer 6, a hole blocking layer 7, an electron transport layer 8, an electron injection layer 9, and a cathode 10 (Al) stacked in sequence. An external power supply 11 is applied between the anode 2 and the cathode 10.

[0134] The method for fabricating the organic electroluminescent device is as follows:

[0135] (1) The glass substrate coated with ITO transparent conductive layer was ultrasonically treated in commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in a mixed solvent of acetone / ethanol, baked in a clean environment until the moisture was completely removed, cleaned with ultraviolet light and ozone, and bombarded with low-energy cation beam.

[0136] (2) Place the glass substrate with the anode in the vacuum chamber and evacuate it to <1×10⁻⁶. -5 Pa, a mixture of compound HT-29:HI-1 (97 / 3, w / w) was vacuum-deposited on the above anodic layer as a hole injection layer at a deposition rate of 0.1 nm / s and a film thickness of 10 nm.

[0137] (3) A 100 nm layer of compound HT-29 was vacuum-deposited on the hole injection layer as a hole transport layer at a deposition rate of 0.1 nm / s.

[0138] (4) HT-41 compound with a thickness of 35 nm was vacuum-deposited on the hole transport layer as an electron blocking layer at a deposition rate of 0.1 nm / s.

[0139] (5) A light-emitting layer of the device is vacuum-deposited on an electron blocking layer. The light-emitting layer comprises a mixture of a host material (the electroluminescent material, P1:N4 = 6:4) and a dopant material (dye, GPD-50), with a mass ratio (w / w) of 100:10 between the host material and the dopant material. The deposition is carried out using a dual-source co-evaporation method. The deposition rate of the first compound is 0.15 nm / s, the deposition rate of the second compound is 0.1 nm / s, the deposition rate of GPD-50 is 0.025 nm / s, and the total deposition film thickness is 36 nm.

[0140] (6) A 5 nm layer of compound ET-17 was vacuum-deposited on the light-emitting layer as a hole blocking layer for the device at a deposition rate of 0.1 nm / s.

[0141] (7) A mixture of compound ET-66:ET-57 (50 / 50, w / w) was vacuum-deposited on the hole blocking layer as an electron transport layer at a deposition rate of 0.1 nm / s and a film thickness of 25 nm.

[0142] (8) A 1 nm thick LiF layer was vacuum-deposited on the electron transport layer as an electron injection layer at a deposition rate of 0.1 nm / s.

[0143] (9) A 150 nm thick layer of metallic aluminum is vacuum-deposited on the electron injection layer as a cathode at a deposition rate of 1 nm / s; thereby, the organic electroluminescent device is obtained.

[0144] Examples 2-36, Comparative Examples 1-9

[0145] An electroluminescent material and an organic electroluminescent device comprising the same are disclosed. The only difference between the electroluminescent material (the main material of the light-emitting layer) and Example 1 is that the electroluminescent material (the main material of the light-emitting layer) is replaced with the compounds in Table 1. The other structures, materials and preparation methods of the device are the same as those in Example 1. The "mass ratio" in Table 1 represents the mass ratio of the first compound to the second compound. The light-emitting layers of Comparative Examples 4-5 and 8-9 all use a single main material, and the mass ratio of the main material to the dopant material is 100:10.

[0146] The structure of the main material in the comparative example is as follows:

[0147] Device performance testing:

[0148] At the same brightness of 3000 cd / m 2The current density of the organic electroluminescent device was measured using a digital source meter and a luminance meter. The ratio of luminance to current density is the current efficiency.

[0149] The current efficiency of Comparative Example 1 is recorded as 1. The current efficiencies of other embodiments and comparative examples are the ratios of their respective test values ​​to the test value of Comparative Example 1. The test results are shown in Table 1.

[0150] Table 1

[0151] As can be seen from the performance data in Table 1, the electroluminescent material provided in this disclosure achieves balanced carrier transport through the synergistic compounding of the first compound and the second compound with specific structures. The test data shows that the electroluminescent material provided in this disclosure, when used as the main material of the light-emitting layer in organic electroluminescent devices, significantly improves the device efficiency compared to comparative examples 1-5, giving the device better overall performance.

[0152] Evaporation performance testing of electroluminescent materials:

[0153] Weigh 1.2g of the first compound and 0.8g of the second compound, mix them thoroughly, and place them in the same crucible in the vapor deposition equipment. Heat to a rate of 4 Å / s and begin vapor deposition, with each film being 100nm thick. Six films are deposited consecutively before removal. Films numbered 1-6 are eluted with dichloromethane, and their liquid phase purity ratios are measured to assess the premixed stability of the materials. Number 0 (i.e., raw material) represents the purity percentage after mixing before vapor deposition, and number 7 represents the percentage of remaining vapor deposition material in the crucible. The test results are shown in Table 2. The area in Table 2 refers to the integral area of ​​the two material combinations in high-performance liquid chromatography (HPLC), and the sum of the two components equals 100%. Because the integral area is directly proportional to the material content, the integral area ratio can effectively determine the mass change of the material during the vapor deposition process. Based on the influence of the ratio on performance, it is generally accepted in the industry that the mass ratio deviation before and after vapor deposition (i.e., the difference between number 7 and number 0) should be less than ±3%.

[0154] Table 2

[0155] As can be seen from the performance data in Table 2, the electroluminescent material provided in this disclosure has excellent vapor deposition stability while ensuring high performance. This ensures that the proportion of the main material changes little during the continuous vapor deposition process, thereby ensuring the stability of device performance. It can also be seen from Examples 33 and 34 that the performance remains basically unchanged under a 5% deviation, further improving the consistency of performance in device fabrication. Moreover, this premixable material can improve equipment utilization and save production costs during the mass production stage.

[0156] The applicant declares that this disclosure illustrates the electroluminescent material and organic electroluminescent device containing the above embodiments, but this disclosure is not limited to the above process steps, that is, it does not mean that this disclosure must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to this disclosure, equivalent substitutions of the raw materials selected in this disclosure, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this disclosure.

Claims

1. An electroluminescent material, characterized in that, The electroluminescent material comprises a combination of a first compound and a second compound; The first compound has a structure as shown in Formula I: wherein Ar1is selected from Any one of them, — * represents the linking site of the group; Ar2 is selected from any one of substituted or unsubstituted C6-C30 aryl groups; R1, R2, R3, R4, R5, and R6 are each independently selected from deuterium, halogen, cyano, substituted or unsubstituted C1-C30 straight-chain or branched alkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted tri(C1-C30 alkyl)silyl, substituted or unsubstituted di(C1-C30 alkyl)(C6-C30 aryl)silyl, substituted or unsubstituted (C1-C30 alkyl)di(C6-C30 aryl)silyl, substituted or unsubstituted tri(C6-C30 aryl)silyl, substituted or unsubstituted C1-C30 alkylamino, substituted or unsubstituted C2-C3 The amino group comprises any one of the following: alkenylamino, substituted or unsubstituted (C1-C30 alkyl)(C2-C30 alkenyl)amino, substituted or unsubstituted (C6-C30 arylamino), substituted or unsubstituted (C1-C30 alkyl)(C6-C30 aryl)amino, substituted or unsubstituted (C3-C30 heteroarylamino), substituted or unsubstituted (C1-C30 alkyl)(C3-C30 heteroaryl)amino, substituted or unsubstituted (C2-C30 alkenyl)(C6-C30 aryl)amino, substituted or unsubstituted (C2-C30 alkenyl)(C3-C30 heteroaryl)amino, and substituted or unsubstituted (C6-C30 aryl)(C3-C30 heteroaryl)amino; wherein at least two adjacent groups among R1, R2, R3, R4, R5, and R6 are not connected or are linked by chemical bonds to form a ring; a is selected from integers from 0 to 2, b, c, d, and e are each independently selected from integers from 0 to 4, f and g are each independently selected from integers from 0 to 5, and h is selected from integers from 0 to 3. The second compound has a structure as shown in Formula II: Where X is O or S; Ar3 and Ar4 are each independently selected from any one of substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl groups; L is selected from any one of single bond, substituted or unsubstituted C6-C30 arylene, substituted or unsubstituted C3-C30 heteroarylene; R7, R8, and R9 are each independently selected from any one of deuterium, halogen, substituted or unsubstituted C1-C20 straight-chain or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C30 alkylsilyl, substituted or unsubstituted C6-C30 arylsilyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C1-C20 alkylthio, substituted or unsubstituted C6-C30 arylthio, and substituted or unsubstituted C6-C30 arylamino; at least two adjacent groups in R7, R8, and R9 are not connected or are linked by chemical bonds to form a ring; m and n are each independently selected from integers from 0 to 4, and p is selected from integers from 0 to 2; The substituents in Ar2, Ar3, Ar4, L, R1, R2, R3, R4, R5, R6, R7, R8, and R9 are each independently selected from any one or a combination of at least two of the following: deuterium, halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight-chain or branched alkyl, C1-C20 alkoxy, C2-C20 alkenyl, C3-C20 cycloalkyl, C2-C20 heterocycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, C3-C30 arylamino, and C3-C30 heteroarylamino. The substituents may optionally be substituted with deuterium.

2. The electroluminescent material of claim 1, wherein, The first compound has a structure as shown in Formula I-1: Ar2, R1, R2, R3, R4, R5, and R6 have the same scope as in claim 1.

3. Electroluminescent material according to claim 1 or 2, characterized in that Ar2is selected from any one of the following groups, which are substituted or unsubstituted: Wherein, —* represents the linking site of the group; Preferably, the substituents in Ar2 are each independently selected from any one or a combination of at least two of deuterium, C1-C10 straight-chain or branched alkyl, C3-C10 cycloalkyl, C6-C20 aryl, and C3-C20 heteroaryl, with deuterium being more preferred.

4. Electroluminescent material according to claim 1 or 2, characterised in that R1, R2, R3, R4, R5, and R6 are each independently selected from any one of deuterium, substituted or unsubstituted C1-C10 straight-chain or branched alkyl groups, substituted or unsubstituted C3-C10 cycloalkyl groups, substituted or unsubstituted C6-C20 aryl groups, and substituted or unsubstituted C3-C20 heteroaryl groups, with deuterium being preferred.

5. The electroluminescent material of claim 1, wherein, The first compound has any one of the structures shown below:

6. The electroluminescent material of claim 1, wherein, each of said Ar3, Ar4is independently selected from any one of the following groups, which are substituted or unsubstituted: Wherein, —* represents the linking site of the group; Y is selected from O, S, NR 11 or CR 12 R 13 Any one of them; R 11 R 12 R 13 Each is independently selected from any one of hydrogen, deuterium, C1-C20 straight-chain or branched alkyl, C6-C30 aryl, C3-C30 heteroaryl, and C2-C20 alkenyl; the R 12 and R 13 They are either not connected or linked by chemical bonds to form a ring; Preferably, the substituents in Ar3 and Ar4 are each independently selected from deuterium, C1-C10 straight-chain or branched alkyl, C3-C10 cycloalkyl, C6-C20 aryl, and C3-C20 heteroaryl, or a combination of at least two of them, with deuterium being more preferred.

7. The electroluminescent material of claim 6, wherein, each Ar3, Ar4is independently selected from any one of the following groups, which are unsubstituted or deuterated: — * represents the site of attachment of the group.

8. The electroluminescent material of claim 1, wherein, The L is selected from any one of single bond, substituted or unsubstituted C6-C20 arylene, and substituted or unsubstituted C3-C20 heteroarylene; Preferably, said L is selected from any one of the following groups, either substituted or not: —* represents the linking site of a functional group.

9. The electroluminescent material of claim 1, wherein, R7, R8, and R9 are each independently selected from any one of deuterium, halogen, substituted or unsubstituted C1-C10 straight-chain or branched alkyl, substituted or unsubstituted C3-C10 cycloalkyl, substituted or unsubstituted C6-C20 aryl, and substituted or unsubstituted C3-C20 heteroaryl, preferably deuterium.

10. The electroluminescent material of claim 1, wherein, The second compound has any one of the structures shown below:

11. The electroluminescent material of claim 1, wherein, The mass ratio of the first compound to the second compound is (0.1-2):1, preferably (0.8-1.5):

1.

12. Use of an electroluminescent material according to any one of claims 1 to 11, characterized in that The electroluminescent material is used in organic electronic devices; Preferably, the electroluminescent material is used in an organic electroluminescent device; Preferably, the electroluminescent material is used as the light-emitting layer material in an organic electroluminescent device; Preferably, the electroluminescent material serves as the host material for the light-emitting layer in an organic electroluminescent device.

13. An organic electroluminescent device, characterized by The organic electroluminescent device includes a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer includes the electroluminescent material as described in any one of claims 1-11; Preferably, the organic layer includes a light-emitting layer, wherein the light-emitting layer includes the electroluminescent material as described in any one of claims 1-11; Preferably, the thickness of the light-emitting layer is 10-60 nm, more preferably 20-50 nm; Preferably, the electroluminescent material serves as the main material of the light-emitting layer; Preferably, the light-emitting layer further includes a doping material; Preferably, the doping material is a phosphorescent doping material; Preferably, the mass of the doped material is 0.1-15% based on the mass of the electroluminescent material being 100%.

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