Electroluminescent material composition and organic electroluminescent device

Abstract

An electroluminescent material composition and an organic electroluminescent device. The electroluminescent material composition comprises a combination of a first organic electroluminescent material and a second organic electroluminescent material. By means of structural design and synergistic compounding of the two types of organic electroluminescent materials, the electroluminescent material composition has excellent photoelectric performance and carrier transport performance, and achieves balanced carrier transport. The electroluminescent composition is used in the organic electroluminescent device and is particularly suitable for use as a main body material of a light-emitting layer, to regulate and control an injection / transport balance of holes and electrons, and prevent large carrier accumulation at an interface. Thus the device has excellent light-emitting efficiency and stability, the service life of the device is significantly prolonged, the device has a lower starting voltage, overall performance of the device is effectively improved, and the current requirements for a high-performance material in panel and display manufacturing are fully satisfied.

Description

Electroluminescent material composition and organic electroluminescent device Technical Field

[0001] The present invention belongs to the technical field of organic electroluminescent materials, and in particular relates to an electroluminescent material composition and an organic electroluminescent device. Background Art

[0002] Organic Light Emission Diode (OLED) is a type of device with a sandwich-like structure, including a cathode film layer, an anode film layer, and an organic functional material layer sandwiched between the two electrode film layers. When voltage is applied to the electrodes of the OLED device, positive charges are injected from the anode and negative charges are injected from the cathode. Under the action of the electric field, the positive and negative charges migrate in the organic layer and recombine to produce light. Due to the advantages of OLED devices such as high brightness, fast response, wide viewing angle, simple process, and flexibility, they have attracted much attention in the fields of new display technologies and new lighting technologies. At present, this technology has been widely used in display panels of new lighting fixtures, smart phones, tablet computers and other products, and will further expand to the application fields of large-size display products such as televisions. It is a new display technology with rapid development and high technical requirements.

[0003] As OLEDs continue to advance in the fields of lighting and display, research on their core functional organic materials has intensified. This is because an efficient and long-lasting OLED device is often the result of an optimized combination of device structure and various organic materials. This presents significant opportunities and challenges for chemists in designing and developing functional materials with various structures. Common functional organic materials include hole injection materials, hole transport materials, hole blocking materials, electron injection materials, electron transport materials, electron blocking materials, luminescent host materials, and luminescent guest materials (dyes).

[0004] In order to prepare OLED light-emitting devices with lower driving voltage, better luminous efficiency and longer device life, and to continuously improve the performance of OLED devices, it is necessary not only to innovate the structure and manufacturing process of OLED devices, but also to continuously research and innovate the functional organic materials in OLED devices to obtain functional materials with higher performance. Based on this, the OLED field has been committed to developing new organic electroluminescent materials to achieve low driving voltage, high luminous efficiency and better device life. In recent years, people in the industry have been constantly trying and exploring to improve device efficiency and stability. Among them, seeking new materials to improve device performance is the most common way. A large number of novel materials have been developed for use in OLED devices. Although they have improved device performance to a certain extent, there is still the problem of large-scale accumulation of carriers at the interface, and there is also the problem of low device efficiency.

[0005] Therefore, the field urgently needs to develop organic electroluminescent devices with higher performance, and further development of organic electroluminescent materials that can provide better photoelectric performance, especially the main materials of the light-emitting layer, is the direction in which the industry continues to strive for breakthroughs.

[0006] Summary of the Invention

[0007] In view of the shortcomings of the prior art, the object of the present invention is to provide an electroluminescent material composition and an organic electroluminescent device. Through the structural design and compounding of a first organic electroluminescent material and a second organic electroluminescent material, the electroluminescent material composition has excellent carrier transport performance and can achieve carrier transport balance, thereby effectively improving the overall performance of the organic electroluminescent device containing the electroluminescent material.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides an electroluminescent material composition, comprising a combination of a first organic electroluminescent material and a second organic electroluminescent material;

[0010] The first organic electroluminescent material has a structure as shown in Formula I:

[0011] In Formula I, X is O or S.

[0012] In Formula I, Ar1, Ar2, and Ar3 are each independently selected from any one of a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group.

[0013] In Formula I, L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; when L1 is a single bond, it represents that the N atom of the aromatic amine is directly connected to the condensed ring through a single bond.

[0014] In Formula I, Z1, Z2, and Z3 are each independently selected from any one of halogen, cyano, substituted or unsubstituted C1-C30 straight or branched alkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C6-C30 arylamino, and substituted or unsubstituted C3-C30 heteroarylamino.

[0015] In Formula I, a, b, and c represent the number of substituents Z1, Z2, and Z3, respectively; a and b are each independently selected from integers of 0-2, for example, 0, 1, or 2; c is selected from integers of 0-4, for example, 0, 1, 2, 3, or 4; 0≤b+c≤5.

[0016] It should be noted that when a=2, the two Z1s are the same or different groups; when b=2, the two Z2s are the same or different groups; and when c≥2, multiple (at least 2) Z3s are the same or different groups.

[0017] The second organic electroluminescent material has a structure as shown in Formula II:

[0018] In Formula II, L2, L3, and L4 are each independently selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; when L2 is a single bond, it means that Ar6 is directly connected to the triazine ring through a single bond; the same applies to L3 and L4, and they are not repeated one by one.

[0019] In Formula II, Ar4 and Ar5 are each independently selected from any one of a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group.

[0020] In formula II, Ar6 is a group represented by formula a:

[0021] Ar6 is connected to L2 via any connecting site; the "any connecting site" in Ar6 includes all carbon atoms shown in the aforementioned groups that are allowed by the chemical environment.

[0022] In formula a, R1, R2, and R3 are each independently selected from any one of halogen, cyano, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 heteroaryl, and substituted or unsubstituted C6-C30 aryl.

[0023] In formula a, d, e, and f represent the number of substituents R1, R2, and R3, respectively; d and e are each independently selected from integers of 0-4, for example, 0, 1, 2, 3, or 4; f is selected from integers of 0-6, for example, 0, 1, 2, 3, 4, 5, or 6; 0≤d+e+f≤13.

[0024] When d≥2, multiple (at least 2) R1s are the same or different groups; the same applies to e and f, which will not be described in detail.

[0025] The substituted substituents in Ar1, Ar2, Ar3, Ar4, Ar5, L1, L2, L3, L4, Z1, Z2, Z3, R1, R2, and R3 are each independently selected from any one or a combination of at least two of halogen, cyano, nitro, hydroxyl, amino, aldehyde, ester, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C1-C20 alkoxy, C3-C20 cycloalkyl, C2-C20 heterocycloalkyl, C6-C30 aryl, and C3-C30 heteroaryl; and the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring by a chemical bond.

[0026] In the present invention, "each of the substituted substituents is independently not bonded to the adjacent ring structure" means that the substituent is bonded only to the carbon atom via a single bond; and "each of the substituted substituents is independently bonded to the adjacent ring structure via a chemical bond to form a ring" means that the substituent is bonded to the carbon atom via a chemical bond and also to the adjacent ring via a chemical bond, thereby forming a fused ring structure. The same descriptions below have the same meaning and are not repeated here.

[0027] In the present invention, the "substituted or unsubstituted" group may be substituted with one or more substituents. When there are multiple substituents (at least two), they may be the same or different. The same expressions used below have the same meaning. Unless otherwise specified, the range of options for the substituents described in Formula I and Formula II is as shown above and will not be repeated here.

[0028] The electroluminescent material composition provided by the present invention comprises a combination of a first organic electroluminescent material and a second organic electroluminescent material, wherein the first organic electroluminescent material contains an aromatic amine skeleton structure and is a compound of the structure shown in Formula I, which has high hole mobility and excellent hole injection and transport properties; the second organic electroluminescent material is a compound of the structure shown in Formula II, which contains a triazine skeleton, and the triazine skeleton is connected to a specific five-ring condensed group (benzo[pi]- ... )Ar6, giving it excellent planar conjugation properties and electron mobility, and having excellent electron injection and transport properties; at the same time, it has a lower triplet energy level, narrowing the energy level difference with the guest (dopant material, dye), which helps to improve the exciton utilization rate. The present invention, through the design and synergistic compounding of two types of organic electroluminescent materials with specific structures, can achieve a better overall transmission effect based on the mutual performance of the two organic electroluminescent materials in the transmission of different types of carriers, so that the electroluminescent material composition has excellent photoelectric properties and carrier transport properties, and realizes balanced carrier transmission. It is used in organic electroluminescent devices, and is particularly suitable as a main material for the light-emitting layer, to regulate the injection / transmission balance of holes and electrons, avoid a large amount of carrier accumulation at the interface, and improve the transmission and utilization of excitons, so that the device has higher luminous efficiency, lower driving voltage and longer life.

[0029] It should be noted that, for ease of explanation, the present invention describes the potential effects of various groups / features of the first and second organic electroluminescent materials separately. This does not imply that these groups / features function in isolation. In fact, the key to achieving excellent performance is the optimized design of the entire molecular structure, resulting from the synergistic effects of the various groups and the two types of materials, rather than the effects of a single group.

[0030] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0031] In the present invention, the halogen may be fluorine, chlorine, bromine or iodine. The following descriptions of the same elements have the same meanings.

[0032] In the present invention, the expression of chemical elements, unless otherwise specified, includes the concept of isotopes with the same chemical properties. For example, hydrogen (H) includes 1 H (hydrogen), 2 H (deuterium, D), 3 H (tritium, T), etc.; carbon (C) includes 12 C. 13 C, etc.

[0033] In the present invention, unless otherwise specified, the heteroatom of the heteroaryl group is selected from N, O, S, P, B, Si or Se, preferably N, O or S.

[0034] In the present invention, the expression of a ring structure crossed by “—” indicates that the connection site is any position on the ring structure that can form a bond.

[0035] In the present invention, "-*" and "*" both represent the attachment site of a group.

[0036] In the present invention, the expression Ca-Cb represents that the number of carbon atoms in the group is ab. Unless otherwise specified, the number of carbon atoms does not include the number of carbon atoms in the substituent.

[0037] In the present invention, “each independently” means that when there are multiple subjects, they may be the same or different.

[0038] In the present invention, the C6-C30 can be C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0039] The C3-C30 can all be C3, C4, C5, C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0040] The 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.

[0041] The C1-C20 can all be C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0042] The C3-C20 can all be C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0043] The C2-C20 can all be C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0044] In the present invention, the C6-C30 aromatic group, preferably a C6-C20 aromatic group, includes a monocyclic aromatic group and a condensed-ring aromatic group; the monocyclic aromatic group means that the group contains at least one phenyl group. When it contains at least two phenyl groups, the phenyl groups are connected by a single bond, and illustratively include but are not limited to: phenyl, biphenyl, terphenyl, quadriphenyl, etc. The fused ring aromatic group means a group containing at least two aromatic rings, and the aromatic rings share two adjacent carbon atoms fused to each other, including but not limited to: naphthyl (1-naphthyl, 2-naphthyl), anthracenyl (1-anthracenyl, 2-anthracenyl, 9-anthracenyl), phenanthrenyl, indenyl, fluorenyl and its 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, spirobifluorenyl, benzofluorenyl, etc.), fluoranthenyl, triphenylene, pyrenyl (1-pyrenyl, 2-pyrenyl, 4-pyrenyl), peryl, It should be noted that monocyclic aromatic groups and condensed aromatic groups connected by a single bond also fall within the scope of aromatic groups, such as phenylnaphthyl, naphthylphenyl, phenylnaphthylphenyl, etc.

[0045] The C3-C30 heteroaryl group, preferably a C3-C20 heteroaryl group, includes a monocyclic heteroaryl group or a condensed-ring heteroaryl group. The monocyclic heteroaryl group means that the molecule contains at least one heteroaryl group. When the molecule contains a heteroaryl group and other groups (such as aryl, heteroaryl, etc.), the heteroaryl group and the other groups are connected by a single bond, and illustratively include but are not limited to: pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, furyl, thienyl, pyrrolyl, bipyridyl, phenylpyridyl, pyridylphenyl, pyrimidinylphenyl, etc. The fused-ring heteroaryl group refers to a group containing at least one aromatic heterocycle and one aromatic ring (aromatic heterocycle or aromatic ring) in the molecule, and the two share two adjacent atoms fused to each other, including but not limited to: quinolyl, isoquinolyl, quinoxalinyl, quinazolinyl, benzofuranyl, benzothiophenyl, isobenzofuranyl, isobenzothiophenyl, indolyl, dibenzofuranyl, dibenzothiophenyl, naphthiobenzofuranyl, naphthiobenzothiophenyl, carbazolyl and its derivatives (N-phenylcarbazolyl, N-naphthylcarbazolyl, benzocarbazolyl, dibenzocarbazolyl, indolecarbazolyl, azacarbazolyl, etc.), acridinyl, phenothiazinyl, phenoxazinyl, hydroacridinyl, etc. It should be noted that heteroaryl groups and heteroaryl groups connected by a single bond, and aryl groups and heteroaryl groups connected by a single bond also fall within the scope of heteroaryl groups, for example, phenyldibenzofuranyl, phenyldibenzothienyl, etc.

[0046] Specific examples of the C6-C30 arylene group include divalent groups obtained by removing one hydrogen atom from the above examples of the aryl group; specific examples of the C3-C30 heteroarylene group include divalent groups obtained by removing one hydrogen atom from the above examples of the heteroaryl group.

[0047] The C1-C30 straight chain or branched chain alkyl group, C1-C20 straight chain or branched chain alkyl group, preferably C1-C10 straight chain or branched chain alkyl group, illustratively include but are 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] Specific examples of the C1-C30 alkoxy group and the C1-C20 alkoxy group include monovalent groups obtained by connecting the above-mentioned linear or branched alkyl groups to O.

[0049] The C2-C20 alkenyl group, preferably a C2-C10 alkenyl group, contains at least one C=C, and illustratively includes but is not limited to: vinyl, propenyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, butadienyl, pentadienyl, etc.

[0050] The C3-C30 cycloalkyl group, C3-C20 cycloalkyl group, preferably C3-C10 cycloalkyl group, includes monocyclic alkyl groups or polycyclic alkyl groups. A monocyclic alkyl group refers to an alkyl group containing a single cyclic structure, and a polycyclic alkyl group refers to a structure composed of two or more cycloalkyl groups sharing one or more ring carbon atoms. Exemplary groups include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and adamantyl groups.

[0051] Specific examples of the C2-C20 heterocycloalkyl group include groups formed by replacing at least one C atom in the aforementioned cycloalkyl group with a heteroatom (such as N, O, S, etc.), including but not limited to: epoxy, oxetanyl, tetrahydrofuranyl, tetrahydrothiophenyl, tetrahydropyrrolyl, tetrahydropyranyl, piperidinyl, piperazinyl, dioxane, morpholinyl, etc.

[0052] The C6-C30 arylamino group is a monovalent group formed by replacing at least one H on -NH2 with the above-mentioned aryl group. The C3-C30 heteroarylamino group is a monovalent group formed by replacing at least one H on -NH2 with the above-mentioned heteroaryl group.

[0053] Preferably, the first organic electroluminescent material comprises any one or a combination of at least two of the compounds having a structure represented by any one of Formula IA, Formula IB, Formula IC, Formula ID, and Formula IE: wherein X, Ar1, Ar2, Ar3, L1, Z1, Z2, Z3, a, b, and c have the same defined ranges as those in Formula I.

[0054] Preferably, Ar1, Ar2, and Ar3 are each independently selected from any one of a substituted or unsubstituted C6-C30 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C24, C26, or C28, etc.) aryl group, and a substituted or unsubstituted C5-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) heteroaryl group.

[0055] Preferably, Ar1, Ar2, and Ar3 are each independently selected from any one of the following substituted or unsubstituted groups:

[0056] Wherein, -* represents the attachment site of the group.

[0057] Y1 is selected from O, S, NR 11 or CR 12 R 13 Any one of .

[0058] R 11 、R 12 、R 13 Each is independently selected from any one or a combination of at least two of C1-C20 straight or branched alkyl, C6-C30 aryl, C3-C30 heteroaryl, and C2-C20 alkenyl; the R 12 and R 13 Not connected or connected to form a ring through chemical bonds.

[0059] Preferably, the R 11 、R 12 、R 13 Each is independently selected from any one or a combination of at least two of C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight chain or branched alkyl, C2-C10 (e.g., C3, C4, C5, C6, C7, C8, C9, etc.) alkenyl, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) aryl, more preferably any one of C1-C6 straight chain or branched alkyl, phenyl, naphthyl, biphenyl, terphenyl, phenylnaphthyl, naphthylphenyl, and even more preferably methyl or phenyl.

[0060] Preferably, the substituted substituents in Ar1, Ar2 and Ar3 are each independently selected from any one or a combination of at least two of C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight chain or branched alkyl, C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) aryl, C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroaryl, and the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring by a chemical bond.

[0061] Preferably, the substituents in Ar1, Ar2, and Ar3 are each independently selected from any one of C1-C6 straight-chain or branched alkyl, phenyl, naphthyl, and biphenyl, and more preferably any one of methyl, ethyl, isopropyl, tert-butyl, tert-amyl, phenyl, naphthyl, and biphenyl.

[0062] Preferably, the substituted substituents in Ar1, Ar2, and Ar3 are each independently not connected to the adjacent ring structure or are connected by a chemical bond to form a ring Cy1, and the ring Cy1 is selected from any one of a substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) alicyclic ring, a substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) aromatic ring, and a substituted or unsubstituted C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroaromatic ring. More preferably, The dashed line represents the fused bond of ring Cy1.

[0063] Preferably, Ar1, Ar2, and Ar3 are each independently selected from any one of the following groups: -* represents the attachment site of the group.

[0064] Preferably, L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) arylene group, and a substituted or unsubstituted C5-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroarylene group.

[0065] Preferably, L1 is selected from any one of the following groups: -* represents the attachment site of the group.

[0066] Y2 is selected from O, S, NR 21 or CR 22 R 23 Any of the following;

[0067] R 21 、R 22 、R 23 Each is independently selected from any one or a combination of at least two of C1-C20 straight or branched alkyl, C6-C30 aryl, C3-C30 heteroaryl, and C2-C20 alkenyl; the R 22 and R 23 Not connected or connected to form a ring through chemical bonds.

[0068] Preferably, the R 21 、R 22 、R 23 Each is independently selected from any one or a combination of at least two of a C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight chain or branched alkyl group, a C2-C10 (e.g., C3, C4, C5, C6, C7, C8, C9, etc.) alkenyl group, or a C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl group.

[0069] Preferably, Y2 is O or S.

[0070] Preferably, the L1 is selected from a single bond, Any of the above, -* represents the attachment site of the group.

[0071] Preferably, Z1, Z2, and Z3 are each independently selected from any one of a C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) linear or branched alkyl group, a C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl group, a C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl group, or a C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16, or C18, etc.) heteroaryl group.

[0072] Preferably, a, b, and c are each independently 0 or 1.

[0073] Preferably, the first organic electroluminescent material is selected from any one or a combination of at least two of the following compounds P1-P258:

[0074] Preferably, the second organic electroluminescent material comprises any one or a combination of at least two of the compounds having a structure represented by any one of Formula IIA, Formula IIB, Formula IIC, Formula IID, Formula IIE, and Formula IIF:

[0075] Wherein, L2, L3, L4, Ar4, and Ar5 have the same defined range as Formula II, and R1, R2, R3, d, e, and f have the same defined range as Formula a; g is selected from an integer of 0-5, for example, it can be 0, 1, 2, 3, 4, or 5; and h is selected from an integer of 0-3, for example, it can be 0, 1, 2, or 3.

[0076] The L2, L3, and L4 are each independently selected from any one of a single bond, a substituted or unsubstituted C6-C20 arylene group, and a substituted or unsubstituted C5-C20 heteroarylene group;

[0077] Preferably, L2, L3, and L4 are each independently selected from any one of the following groups: -* represents the attachment site of the group;

[0078] Y3 is selected from O, S, NR 31 or CR 32 R 33 Any of the following;

[0079] R 31 、R 32 、R 33 Each is independently selected from any one or a combination of at least two of C1-C20 straight or branched alkyl, C6-C30 aryl, C3-C30 heteroaryl, and C2-C20 alkenyl; the R 32 and R 33 Not connected or connected to form a ring through chemical bonds.

[0080] Preferably, the R 31 、R 32 、R 33Each is independently selected from any one or a combination of at least two of a C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight chain or branched alkyl group, a C2-C10 (e.g., C3, C4, C5, C6, C7, C8, C9, etc.) alkenyl group, or a C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl group.

[0081] Preferably, Y3 is O or S.

[0082] Preferably, L2, L3, L4 are each independently selected from a single bond, Any one of, further preferably a single bond, -* represents the attachment site of the group.

[0083] Preferably, Ar4 and Ar5 are each independently selected from any one of a substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) aryl group, and a substituted or unsubstituted C5-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) heteroaryl group.

[0084] Preferably, Ar4 and Ar5 are each independently selected from any one of the following substituted or unsubstituted groups: -* represents the attachment site of the group.

[0085] Y4 is selected from O, S, NR 41 or CR 42 R 43 Any one of .

[0086] R 41 、R 42 、R 43 Each is independently selected from any one or a combination of at least two of C1-C20 straight or branched alkyl, C6-C30 aryl, C3-C30 heteroaryl, and C2-C20 alkenyl; the R 42 and R 43 Not connected or connected to form a ring through chemical bonds.

[0087] Preferably, the R 41 、R 42 、R 43Each is independently selected from any one or a combination of at least two of a straight or branched chain alkyl group (for example, C2, C3, C4, C5, C6, C7, C8, C9, etc.), a C2-C10 alkenyl group (for example, C3, C4, C5, C6, C7, C8, C9, etc.), and a C6-C20 aryl group (for example, C6, C9, C10, C12, C14, C15, C16 or C18, etc.).

[0088] Preferably, Y4 is O or S.

[0089] Preferably, the substituted substituents in Ar4 and Ar5 are each independently selected from any one or a combination of at least two of cyano, C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight or branched alkyl, C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) aryl, C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroaryl; and the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring by chemical bonds.

[0090] Preferably, the substituents substituted in Ar4 and Ar5 are each independently selected from any one of cyano, C1-C6 straight-chain or branched alkyl, phenyl, naphthyl, biphenyl, and phenylnaphthyl, and more preferably any one of cyano, methyl, ethyl, isopropyl, tert-butyl, tert-amyl, phenyl, naphthyl, biphenyl, and phenylnaphthyl.

[0091] Preferably, Ar4 and Ar5 are each independently selected from any one of the following groups: -* represents the attachment site of the group.

[0092] Preferably, R1, R2, and R3 are each independently selected from any one of a C1-C10 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.) straight chain or branched alkyl group, a C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl group, a C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl group, or a C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16, or C18, etc.) heteroaryl group.

[0093] Preferably, d, e, and f are each independently 0 or 1.

[0094] Preferably, g and h are each independently 0 or 1.

[0095] Preferably, the second organic electroluminescent material is selected from any one or a combination of at least two of the following compounds A1-A63, B1-B63, C1-C63, D1-D63, and E1-E16:

[0096] Preferably, the first organic electroluminescent material includes any one of the compounds having a structure as shown in any one of Formula IA, Formula IB, Formula IC, Formula ID, and Formula IE, and is further preferably any one of Compounds P1-P258.

[0097] Preferably, the second organic electroluminescent material includes any one of the compounds having a structure represented by any one of Formula IIA, Formula IIB, Formula IIC, Formula IID, Formula IIE, and Formula IIF, and is further preferably any one of compounds A1-A63, B1-B63, C1-C63, D1-D63, and E1-E16.

[0098] Preferably, the difference between the HOMO energy level of the first organic electroluminescent material and the HOMO energy level of the second organic electroluminescent material is 0.2-1 eV, for example, 0.3 eV, 0.4 eV, 0.5 eV, 0.6 eV, 0.7 eV, 0.8 eV or 0.9 eV.

[0099] Preferably, the HOMO energy level of the first organic electroluminescent material is -5.1 eV to -5.4 eV, for example, -5.15 eV, -5.2 eV, -5.25 eV, -5.3 eV or -5.35 eV.

[0100] Preferably, the HOMO energy level of the second organic electroluminescent material is -5.6 eV to -6.0 eV, for example, -5.65 eV, -5.7 eV, -5.75 eV, -5.8 eV, -5.85 eV, -5.9 eV or -5.95 eV.

[0101] As a preferred technical solution of the present invention, the HOMO energy level difference between the first organic electroluminescent material and the second organic electroluminescent material is 0.3-1eV, which can complement each other's shortcomings in the transmission performance of different types of carriers based on the two materials, thereby achieving a better overall transmission effect.

[0102] Preferably, based on the mass of the electroluminescent material composition as 100%, the mass of the first organic electroluminescent material is 9%-66.7%, for example, it can be 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58%, 60%, 62% or 65%, etc., further preferably 30%-66.7%, and even more preferably 44%-60%.

[0103] Preferably, the mass ratio of the first organic electroluminescent material to the second organic electroluminescent material 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 further preferably (0.8-1.5):1.

[0104] In a second aspect, the present invention provides a use of the electroluminescent material composition according to the first aspect, wherein the electroluminescent material composition is used in an organic electronic device.

[0105] Preferably, 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.

[0106] Preferably, the electroluminescent material composition is used in an organic electroluminescent device.

[0107] Preferably, the electroluminescent material composition is used as a light-emitting layer material in an organic electroluminescent device.

[0108] Preferably, the electroluminescent material composition is used as a host material of a light-emitting layer in an organic electroluminescent device.

[0109] Of course, the application of the electroluminescent material composition is not limited to the main material of the light-emitting layer. In some technical solutions, it can also be used as a hole blocking material, an electron blocking material, etc.; preferably, it is used as the main material of the light-emitting layer.

[0110] In a third aspect, the present invention provides an organic electroluminescent device, comprising a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises the electroluminescent material composition as described in the first aspect.

[0111] Preferably, the organic layer includes a light-emitting layer, and the light-emitting layer includes the electroluminescent material composition as described in the first aspect.

[0112] As a preferred technical solution of the present invention, the electroluminescent material composition serves as the main material of the light-emitting layer, which is a dual-host material system. The first organic electroluminescent material (first host material) is a hole-type host material with good hole transport capability; the second organic electroluminescent material (second host material) is an electron-type host material, which is mainly responsible for the transport of electrons in the light-emitting layer; the dual-host material synergistically compounded with the two organic electroluminescent materials can achieve a balanced transport of holes and electrons, avoid a large amount of carrier accumulation at the interface, improve the utilization rate of excitons, and significantly improve the comprehensive performance of the device, such as efficiency, life and voltage.

[0113] Preferably, the light-emitting layer further includes a doping material.

[0114] In the present invention, the term "dopant material" is also called "dye", "luminescent dye" or "guest material".

[0115] Preferably, the doping material is a phosphorescent doping material.

[0116] Preferably, based on 100% by mass of the electroluminescent material composition, the mass of the doping material is 1-10%, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%.

[0117] Preferably, the thickness of the light-emitting layer is 10-60 nm, for example, it can be 12 nm, 15 nm, 18 nm, 20 nm, 22 nm, 25 nm, 28 nm, 30 nm, 32 nm, 35 nm, 38 nm, 40 nm, 42 nm, 45 nm, 48 nm, 50 nm, 52 nm, 55 nm or 58 nm, and more preferably 20-50 nm.

[0118] Preferably, the organic layer further includes a hole transport region and an electron transport region.

[0119] Preferably, the hole transport region includes any one of a hole injection layer, a hole transport layer, and an electron blocking layer, or a combination of at least two of them.

[0120] Preferably, the electron transport region includes any one of an electron injection layer, an electron transport layer, and a hole blocking layer, or a combination of at least two of them.

[0121] In a preferred embodiment, the organic electroluminescent device (OLED device) includes a first electrode, a second electrode, and an organic layer located between the electrodes. The organic layer can be divided into multiple regions, such as a hole transport region, a light-emitting layer, and an electron transport region; the light-emitting layer comprises the electroluminescent material composition provided by the present invention.

[0122] In a preferred embodiment, the organic electroluminescent device comprises a first electrode, multiple light-emitting functional layers (organic layers), and a second electrode, arranged in sequence; the organic layers comprise 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 in sequence, with the hole injection layer in contact with the first electrode (anode). The organic layer (preferably the light-emitting layer) comprises the electroluminescent material composition provided by the present invention.

[0123] In a preferred embodiment, a substrate can be used below the first electrode or above the second electrode. The substrate is made of glass or a polymer material with excellent mechanical strength, thermal stability, water resistance, and transparency. Furthermore, the substrate used for the display can also be provided with thin-film transistors (TFTs).

[0124] The first electrode can be formed by sputtering or depositing the material used as the first electrode on the substrate. When the first electrode serves as an anode, transparent conductive oxide materials such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO2), zinc oxide (ZnO), and any combination thereof can be used. When the first electrode serves as a cathode, metals or alloys such as magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), ytterbium (Yb), magnesium-indium (Mg-In), and magnesium-silver (Mg-Ag) can be used, as well as any combination thereof.

[0125] The organic layer can be formed on the electrode by vacuum thermal evaporation, spin coating, printing, etc. The compound used as the organic layer can be an organic small molecule, an organic macromolecule or a polymer, or a combination thereof.

[0126] The hole transport region is located between the anode and the light-emitting 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. The hole transport region can also be a multilayer structure comprising at least one of the following: 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 light-emitting layer.

[0127] The material of the hole transport region can be selected from, but 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 the compounds shown below as HT-1 to HT-52; or any combination thereof.

[0128] 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 use one or more of the compounds HT-1 to HT-52 described above, or one or more of the compounds HI-1 to HI-3 described below. Alternatively, one or more of the compounds HT-1 to HT-52 can be doped with one or more of the compounds HI-1 to HI-3 described below.

[0129] The light-emitting layer includes a host material (Host, the electroluminescent material composition provided by the present invention) and a luminescent dye (i.e., a dopant) that can emit light of different wavelength spectra. Alternatively, the light-emitting layer can be a monochromatic light-emitting layer that emits 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 a pixel pattern, or they can be stacked together to form a multicolored light-emitting layer. When stacked together, the light-emitting layers of different colors can be separated from each other or connected to each other. Alternatively, the light-emitting layer can be a single color light-emitting layer that can simultaneously emit different colors, such as red, green, and blue.

[0130] Depending on the technology, the light-emitting layer material can be phosphorescent electroluminescent materials. An OLED device can use a single light-emitting technology or a combination of multiple technologies. These different light-emitting materials, classified by technology, can emit light of the same color or different colors.

[0131] In a preferred technical solution of the present invention, the material of the light-emitting layer is a phosphorescent host material, and the phosphorescent host material is the electroluminescent material composition provided by the present invention, comprising a combination of a first organic electroluminescent material (structure shown in Formula I) and a second organic electroluminescent material (structure shown in Formula II).

[0132] In one aspect of the present invention, the light-emitting layer adopts phosphorescent electroluminescence technology. The phosphorescent doping material of the light-emitting layer can be selected from, but not limited to, one or more combinations of GPD-1 to GPD-47 listed below. Where D is deuterium.

[0133] In one aspect of the present invention, the light-emitting layer adopts phosphorescent electroluminescence technology. The phosphorescent doping material of the light-emitting layer can be selected from, but not limited to, one or more combinations of RPD-1 to RPD-28 listed below.

[0134] In one aspect of the present invention, the light-emitting layer adopts phosphorescent electroluminescence technology. The phosphorescent doping material of the light-emitting layer can be selected from, but not limited to, one or more combinations of YPD-1 to YPD-11 listed below.

[0135] The organic layer may further include an electron transport region (ETR) between the light-emitting layer and the cathode. The ETR may be a single-layered electron transport layer (ETL), including those containing only one compound and those containing multiple compounds. The ETR may also be a multilayered structure comprising at least one of an electron injection layer (EIL), an electron transport layer (ETL), and a hole blocking layer (HBL); the HBL is located between the light-emitting layer and the ETL, and the EIL is located between the cathode and the ETL.

[0136] In one aspect of the present invention, the electron transport layer material can be selected from, but not limited to, one or more combinations of ET-1 to ET-74 listed below.

[0137] In one aspect of the present invention, a hole blocking layer (HBL) is located between the electron transport layer and the light emitting layer. The hole blocking layer can be made of, but is not limited to, one or more compounds of the above ET-1 to ET-74.

[0138] 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, and Yb.

[0139] In a fourth aspect, the present invention provides a display device, comprising the organic electroluminescent device according to the third aspect.

[0140] Preferably, the display device includes a display screen or a display panel.

[0141] The present invention further provides an electronic device, comprising the aforementioned display device.

[0142] Compared with the prior art, the present invention has the following beneficial effects:

[0143] The electroluminescent material composition provided by the present invention has a structural design and synergistic compounding of two types of organic electroluminescent materials, so that the electroluminescent material composition has excellent photoelectric properties and carrier transport properties, and realizes balanced carrier transport. When used in organic electroluminescent devices, it is particularly suitable as a host material for the light-emitting layer. It regulates the injection / transport balance of holes and electrons, avoids large-scale accumulation of carriers at the interface, and makes the device have excellent luminous efficiency and stability, significantly extends the device life, and has a lower starting voltage, effectively improving the overall performance of the device, and fully meeting the requirements for high-performance materials in current panel and display manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0144] FIG1 is a schematic structural diagram of an organic electroluminescent device provided in one embodiment of the present invention;

[0145] 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 DESCRIPTION

[0146] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0147] In the present invention, the first organic electroluminescent material and the second organic electroluminescent material can be prepared by methods disclosed in the prior art; for example, reference can be made to the contents disclosed in the prior art CN113277988A, CN107922351A, CN110291075A, CN108463456A, etc.

[0148] Example 1

[0149] An electroluminescent material composition and an organic electroluminescent device comprising the same; the electroluminescent material composition comprises a combination of a first organic electroluminescent material (compound P8) and a second organic electroluminescent material (compound A37), with the mass ratio of the two being 1:1.

[0150] The structural schematic diagram of the organic electroluminescent device containing the electroluminescent material composition is shown in Figure 1, which 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.

[0151] The preparation method of the organic electroluminescent device is as follows:

[0152] (1) A glass substrate coated with an ITO transparent conductive layer was ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in a mixed solvent of acetone / ethanol, baked in a clean environment until the water was completely removed, cleaned with ultraviolet light and ozone, and bombarded with a low-energy cation beam;

[0153] (2) Place the glass substrate with the anode in a vacuum chamber and evacuate to a vacuum of <1×10 -5 Pa, a mixture of compound HT-4:HI-3 (97 / 3, w / w) was vacuum-deposited on the above-mentioned anode layer as a hole injection layer at a deposition rate of 0.1 nm / s and a deposition film thickness of 10 nm;

[0154] (3) Vacuum evaporation of compound HT-4 on the hole injection layer as a hole transport layer at a deposition rate of 0.1 nm / s and a total deposition thickness of 60 nm;

[0155] (4) Vacuum evaporation of compound HT-52 on the hole transport layer as an electron blocking layer at a deposition rate of 0.1 nm / s and a total deposition thickness of 60 nm;

[0156] (5) vacuum evaporating the light-emitting layer of the device on the electron blocking layer, wherein the light-emitting layer comprises a ternary mixture of a host material (the electroluminescent material composition, P8:A37=1:1) and a dopant material (dye, RPD-14), wherein the mass percentage of the dopant material in the light-emitting layer is 3%; the evaporation rate is 0.1 nm / s, and the total film thickness of the evaporation is 40 nm;

[0157] (6) Vacuum evaporation of compound ET-74 as a hole blocking layer on the light-emitting layer at a rate of 0.1 nm / s and a total film thickness of 5 nm;

[0158] (7) Vacuum evaporation of a mixture of compounds ET-69:ET-57 (50 / 50, w / w) on the hole blocking layer as an electron transport layer at a deposition rate of 0.1 nm / s and a total deposition thickness of 25 nm;

[0159] (8) Vacuum evaporation of 1 nm thick LiF as an electron injection layer on the electron transport layer at a rate of 0.1 nm / s;

[0160] (9) Aluminum with a thickness of 150 nm was vacuum-deposited on the electron injection layer as a cathode at a deposition rate of 1 nm / s; thereby, the organic electroluminescent device of Example 1-1 was obtained.

[0161] Examples 1-2 to 15-1, Comparative Examples 1 to 4

[0162] An electroluminescent material composition and an organic electroluminescent device comprising the same, which differ from Example 1-1 only in that the electroluminescent material composition (the main material of the light-emitting layer) is replaced with the compounds in Tables 1 and 2, and the other structures, materials, and preparation methods of the devices are the same as those in Example 1-1; the "mass ratio" in Tables 1 and 2 represents the mass ratio of the first organic electroluminescent material to the second organic electroluminescent material, and "--" indicates that the compound is not added / the ratio does not exist.

[0163] The main materials in the comparative example are as follows:

[0164] Performance testing:

[0165] At the same brightness of 3000cd / m 2 Under these conditions, a digital source meter and a luminance meter are used to measure the voltage and current density of the organic electroluminescent device. The ratio of brightness to current density is the current efficiency.

[0166] The test values ​​of voltage and current efficiency of comparative example 4 are recorded as 1, and the voltage and current efficiencies of other embodiments and comparative examples are the ratios of their respective test values ​​to the test values ​​of comparative example 4; the test results are shown in Tables 1 and 2.

[0167] Table 1

[0168] Table 2

[0169] It can be seen from the performance data of Table 1 and Table 2 that in the present invention, the good hole mobility of the first organic electroluminescent material of the structure shown in Formula I matches the good electron mobility of the second organic electroluminescent material of the structure shown in Formula II, thereby achieving a balance of carriers. The electroluminescent material composition composed together is used as a dual-host material for an organic electroluminescent device, which can effectively improve the device luminous efficiency, reduce the driving voltage of the device, and give the device better overall performance. In addition, although the second organic electroluminescent material of the structure shown in Formula II defined in Ref4 and the present invention both contain a triazine structure, they are essentially different. The present invention has a larger conjugated structure compared thereto, has a higher molecular planarity on the one hand, and has a lower triplet energy level on the other hand, which reduces the energy level difference between the host and the guest, improves the utilization rate of the exciton, further improves the efficiency of the device, and reduces the operating voltage of the device.

[0170] The applicant states that while the present invention uses the above-described embodiments to illustrate the electroluminescent material composition and organic electroluminescent device, the present invention is not limited to the above-described process steps, nor does it imply that the present invention must rely on the above-described process steps for implementation. Persons skilled in the art will appreciate that any improvements to the present invention, equivalent substitutions for the raw materials used, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. An electroluminescent material composition, characterized in that: The electroluminescent material composition comprises a combination of a first organic electroluminescent material and a second organic electroluminescent material; The first organic electroluminescent material has a structure as shown in Formula I: Wherein, X is O or S; Ar1, Ar2, Ar3 are each independently selected from any one of a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C3-C30 heteroaryl group; L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; Z1, Z2, and Z3 are each independently selected from any one of halogen, cyano, substituted or unsubstituted C1-C30 straight or branched alkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C6-C30 arylamino, and substituted or unsubstituted C3-C30 heteroarylamino; a and b are each independently selected from an integer of 0-2, and c is selected from an integer of 0-4; The second organic electroluminescent material has a structure as shown in Formula II: Wherein, L2, L3, and L4 are each independently selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; Ar4 and Ar5 are each independently selected from any one of a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group; Ar6 is a group represented by formula a: Ar6 is connected to L2 via any connectable site; R1, R2, and R3 are each independently selected from any one of halogen, cyano, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C3-C30 heteroaryl, and substituted or unsubstituted C6-C30 aryl; d and e are each independently selected from an integer of 0-4, and f is selected from an integer of 0-6; The substituents substituted in Ar1, Ar2, Ar3, Ar4, Ar5, L1, L2, L3, L4, Z1, Z2, Z3, R1, R2, and R3 are each independently selected from any one or a combination of at least two of halogen, cyano, nitro, hydroxyl, amino, aldehyde, ester, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C1-C20 alkoxy, C3-C20 cycloalkyl, C2-C20 heterocycloalkyl, C6-C30 aryl, and C3-C30 heteroaryl; The substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring through a chemical bond.

2. The electroluminescent material composition according to claim 1, characterized in that: The first organic electroluminescent material includes any one or a combination of at least two of the compounds having a structure as shown in any one of Formula IA, Formula IB, Formula IC, Formula ID, and Formula IE: wherein X, Ar1, Ar2, Ar3, L1, Z1, Z2, Z3, a, b, and c have the same defined ranges as those in Formula I.

3. The electroluminescent material composition according to claim 1 or 2, characterized in that: The Ar1, Ar2, and Ar3 are each independently selected from any one of a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C5-C20 heteroaryl group; Preferably, Ar1, Ar2, Ar3 are each independently selected from any one of the following substituted or unsubstituted groups: Among them, --* represents the attachment site of the group; Y1 is selected from O, S, NR 11 or CR 12 R 13 Any of the following: R 11 , R 12 , R 13 Each is independently selected from any one or a combination of at least two of a C1-C20 straight or branched alkyl group, a C6-C30 aryl group, a C3-C30 heteroaryl group, and a C2-C20 alkenyl group; 12 and R 13 Not connected or connected into rings by chemical bonds; Preferably, the R 11 , R 12 , R 13 Each is independently selected from any one or a combination of at least two of a C1-C10 straight or branched alkyl group, a C2-C10 alkenyl group, and a C6-C20 aryl group; Preferably, the substituted substituents in Ar1, Ar2 and Ar3 are each independently selected from any one or a combination of at least two of C1-C10 straight or branched alkyl, C3-C10 cycloalkyl, C6-C20 aryl and C3-C20 heteroaryl; and the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring through chemical bonds.

4. The electroluminescent material composition according to claim 3, characterized in that: The Ar1, Ar2, and Ar3 are each independently selected from any one of the following groups: ——* represents the attachment site of the group.

5. The electroluminescent material composition according to claim 1 or 2, characterized in that: The L1 is selected from any one of a single bond, a substituted or unsubstituted C6-C20 arylene group, and a substituted or unsubstituted C5-C20 heteroarylene group; Preferably, L1 is selected from any one of the following groups which are single bonds, substituted or unsubstituted: ——* represents the attachment site of the group; Y2 is selected from O, S, NR 21 or CR 22 R 23 Any of the following: R 21 , R 22 , R 23 Each is independently selected from any one or a combination of at least two of a C1-C20 straight or branched alkyl group, a C6-C30 aryl group, a C3-C30 heteroaryl group, and a C2-C20 alkenyl group; 22 and R 23 Not connected or connected into rings by chemical bonds; Preferably, Y2 is O or S.

6. The electroluminescent material composition according to claim 5, characterized in that: The L1 is selected from a single bond, Any of the following, --* represents the attachment site of the group.

7. The electroluminescent material composition according to claim 1, characterized in that: The first organic electroluminescent material is selected from any one or a combination of at least two of the following compounds P1-P258:

8. The electroluminescent material composition according to claim 1, characterized in that: The second organic electroluminescent material includes any one or a combination of at least two of the compounds having a structure as shown in any one of Formula IIA, Formula IIB, Formula IIC, Formula IID, Formula IIE, and Formula IIF: Wherein, L2, L3, L4, Ar4, Ar5 have the same defined range as Formula II, R1, R2, R3, d, e, f have the same defined range as Formula a; g is selected from an integer of 0-5, and h is selected from an integer of 0-3.

9. The electroluminescent material composition according to claim 1 or 8, characterized in that: The L2, L3, and L4 are each independently selected from any one of a single bond, a substituted or unsubstituted C6-C20 arylene group, and a substituted or unsubstituted C5-C20 heteroarylene group; Preferably, L2, L3, L4 are each independently selected from any one of the following groups which are single bonds, substituted or unsubstituted: ——* represents the attachment site of the group; Y3 is selected from O, S, NR 31 or CR 32 R 33 Any of the following: R 31 , R 32 , R 33 Each is independently selected from any one or a combination of at least two of a C1-C20 straight or branched alkyl group, a C6-C30 aryl group, a C3-C30 heteroaryl group, and a C2-C20 alkenyl group; 32 and R 33 Not connected or connected into rings by chemical bonds; Preferably, Y3 is O or S.

10. The electroluminescent material composition according to claim 9, characterized in that: The L2, L3, and L4 are each independently selected from a single bond, Any of the following, --* represents the attachment site of the group.

11. The electroluminescent material composition according to claim 1 or 8, characterized in that: Ar4 and Ar5 are each independently selected from any one of a substituted or unsubstituted C6-C20 aryl group and a substituted or unsubstituted C5-C20 heteroaryl group; Preferably, Ar4 and Ar5 are each independently selected from any one of the following substituted or unsubstituted groups: ——* represents the attachment site of the group; Y4 is selected from O, S, NR 41 or CR 42 R 43 Any of the following: R 41 , R 42 , R 43 Each is independently selected from any one or a combination of at least two of a C1-C20 straight or branched alkyl group, a C6-C30 aryl group, a C3-C30 heteroaryl group, and a C2-C20 alkenyl group; 42 and R 43 Not connected or connected into rings by chemical bonds; Preferably, Y4 is O or S; Preferably, the substituted substituents in Ar4 and Ar5 are each independently selected from any one or a combination of at least two of cyano, C1-C10 straight or branched alkyl, C3-C10 cycloalkyl, C6-C20 aryl, and C3-C20 heteroaryl; and the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring through chemical bonds.

12. The electroluminescent material composition according to claim 11, characterized in that: The Ar4 and Ar5 are each independently selected from any one of the following groups: ——* represents the attachment site of the group.

13. The electroluminescent material composition according to claim 1, characterized in that: The second organic electroluminescent material is selected from any one of the following compounds A1-A63, B1-B63, C1-C63, D1-D63, E1-E16, or a combination of at least two thereof:

14. The electroluminescent material composition according to claim 1, characterized in that: Based on the mass of the electroluminescent material composition being 100%, the mass of the first organic electroluminescent material is 9%-66.7%, preferably 30%-66.7%, and more preferably 44%-60%; Preferably, the mass ratio of the first organic electroluminescent material to the second organic electroluminescent material is (0.1-2):1, and more preferably (0.8-1.5):

1.

15. Use of the electroluminescent material composition according to any one of claims 1 to 14, characterized in that: The electroluminescent material composition is applied to organic electronic devices; Preferably, the electroluminescent material composition is applied to an organic electroluminescent device; Preferably, the electroluminescent material composition is used as a light-emitting layer material in an organic electroluminescent device; Preferably, the electroluminescent material composition is used as a host material of a light-emitting layer in an organic electroluminescent device.

16. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises a first electrode, a second electrode and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises the electroluminescent material composition according to any one of claims 1 to 14.

17. The organic electroluminescent device according to claim 16, characterized in that: The organic layer comprises a light-emitting layer, wherein the light-emitting layer comprises the electroluminescent material composition according to any one of claims 1 to 14; Preferably, the electroluminescent material composition is used as the host 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, based on 100% of the mass of the electroluminescent material composition, the mass of the doping material is 1-10%; Preferably, the thickness of the light-emitting layer is 10-60 nm, more preferably 20-50 nm.

18. A display device, characterized in that: The display device comprises the organic electroluminescent device according to claim 16 or 17.

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