Electroluminescent material composition and organic electroluminescent device

Abstract

The invention provides 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, and through structural design and synergistic compounding of the two kinds of organic electroluminescent materials, the organic electroluminescent material composition is prepared. The electroluminescent material composition has excellent photoelectric properties and carrier transport properties, realizes balanced transport of carriers, is used for organic electroluminescent devices, is especially suitable for being used as a main body material of a luminescent layer, regulates injection / transport balance of holes and electrons, prevents a large amount of carriers from being accumulated at an interface, and improves the luminous efficiency of the organic electroluminescent devices. The device has excellent luminous efficiency and stability, the service life of the device is remarkably prolonged, the starting voltage is lower, the comprehensive performance of the device is effectively improved, and the requirements for high-performance materials in current panel and display manufacturing are fully met.

Description

Technical Field

[0001] The 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 achieve light emission. Due to the advantages of high brightness, fast response, wide viewing angle, simple process, and flexibility, OLED devices have attracted much attention in the fields of new display technology and new lighting technology. 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 fast development and high technical requirements.

[0003] As OLED continues to advance in the two major fields of lighting and display, people are paying more attention to the research on its core functional organic materials. This is because an OLED device with good efficiency and long life is usually the result of an optimized combination of device structure and various organic materials, which provides great opportunities and challenges for chemists to design and develop functional materials of 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), etc.

[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 study 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 continuously tried and explored ways 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 and applied to OLED devices. Although it has a certain improvement on device performance, there is still a problem of large accumulation of carriers at the interface, and there is also a problem of low device efficiency.

[0005] Therefore, the field is in urgent need of developing organic electroluminescent devices with higher performance. Further development of organic electroluminescent materials, especially light-emitting layer host materials, that can provide better photoelectric performance is the direction in which the industry continues to strive for breakthroughs. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose 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 comprehensive performance of the organic electroluminescent device containing the electroluminescent material.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides an electroluminescent material composition, the electroluminescent material composition comprising a combination of a first organic electroluminescent material and a second organic electroluminescent material;

[0009] The first organic electroluminescent material has a structure as shown in Formula I:

[0010]

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

[0012] In Formula I, Ar 1 ,Ar 2 ,Ar 3 Each is 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, L 1 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 the L 1 When it is a single bond, it means that the N atom of the aromatic amine is directly connected to the condensed ring through a single bond.

[0014] In Formula I, Z 1 , Z 2 , Z 3 Each is 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 substituents Z 1 , Z 2 , Z 3 a, b are each independently selected from an integer of 0-2, for example, 0, 1 or 2; c is selected from an integer 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 Z 1 are the same or different groups; when b=2, the two Z 2 are the same or different groups; when c≥2, multiple (at least 2) Z 3 are the same or different groups.

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

[0018]

[0019] In Formula II, L 2 , L 3 , L 4 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 the L 2 When it is a single bond, it represents Ar 6 Directly connected to the triazine ring via a single bond; L 3 and L 4 Similarly, I will not go into details one by one.

[0020] In Formula II, Ar 4 ,Ar 5 Each is independently selected from any one of a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group.

[0021] In Formula II, Ar 6 A group represented by formula a:

[0022]

[0023] The Ar 6 Through any ligatable site with L 2 connected; the Ar 6 The "any possible attachment site" includes all carbon atoms shown in the aforementioned groups as long as the chemical environment permits.

[0024] In formula a, R 1 , R 2 , R 3Each is 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.

[0025] In formula a, d, e, and f represent substituents R 1 , R 2 , R 3 The number of; d, e are each independently selected from an integer of 0-4, for example, 0, 1, 2, 3 or 4; f is selected from an integer of 0-6, for example, 0, 1, 2, 3, 4, 5 or 6; 0≤d+e+f≤13.

[0026] When d≥2, multiple (at least 2) R 1 are the same or different groups; the same is true for e and f, which will not be described one by one.

[0027] Ar 1 ,Ar 2 ,Ar 3 ,Ar 4 ,Ar 5 , L 1 , L 2 , L 3 , L 4 , Z 1 , Z 2 , Z 3 , R 1 , R 2 , R 3 The substituted substituents 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 chemical bonds.

[0028] In the present invention, "the substituted substituents are each independently not connected to the adjacent ring structure" means that the substituent is only connected to the C atom through a single bond; "the substituted substituents are each independently connected to the adjacent ring structure through a chemical bond to form a ring" means that the substituent is connected to the C atom through a chemical bond and is also connected to the adjacent ring through a chemical bond, thereby forming a fused ring structure. When the same description is involved below, it has the same meaning and will not be repeated one by one.

[0029] In the present invention, the "substituted or unsubstituted" group may be substituted with one substituent or with multiple substituents. When there are multiple (at least 2) substituents, they may be the same or different substituents. When the same expressions are mentioned below, they have the same meaning. Unless otherwise specified, the selection range of the substituents substituted in Formula I and Formula II is as shown above and will not be repeated.

[0030] 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 type of compound with a structure as shown in Formula I, which has high hole mobility and excellent hole injection and transport properties; the second organic electroluminescent material is a compound with a structure as shown in Formula II, which contains a triazine skeleton, and a specific five-ring condensed group (benzophenone) is connected to the triazine skeleton. )Ar 6 , giving it excellent planar conjugation properties and electron mobility, and having excellent electron injection and transmission performance; at the same time, it has a lower triplet energy level, which reduces the energy level difference with the guest (dopant material, dye), and 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 transmission performance, and realizes balanced carrier transmission. It is used in organic electroluminescent devices, especially suitable as the main material of the light-emitting layer, to regulate the injection / transmission balance of holes and electrons, avoid the accumulation of a large number of carriers 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.

[0031] It should be noted that, for the sake of convenience, the present invention describes the possible effects of each group / feature of the first organic electroluminescent material and the second organic electroluminescent material respectively, but this does not mean that these groups / features act in isolation. 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 the various groups and the two types of materials, rather than the effect of a single group.

[0032] 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.

[0033] In the present invention, the halogen may be fluorine, chlorine, bromine or iodine. The following descriptions involving the same have the same meaning.

[0034] 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.

[0035] 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.

[0036] In the present invention, the expression of a ring structure crossed by “—” indicates that the connection site is at any position on the ring structure that can form a bond.

[0037] In the present invention, "-*" and "*" both represent the connection site of a group.

[0038] In the present invention, the expression of Ca-Cb means 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.

[0039] In the present invention, “each independently” means that when there are multiple subjects, they may be the same as or different from each other.

[0040] In the present invention, the C6-C30 may be C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28.

[0041] The C3-C30 can all be C3, C4, C5, C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0042] 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.

[0043] 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.

[0044] The C3-C20 can all be C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0045] The C2-C20 can all be C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17 or C18, etc.

[0046] In the present invention, the C6-C30 aromatic group is preferably a C6-C20 aromatic group, including a monocyclic aromatic group and a condensed-ring aromatic group; the monocyclic aromatic group means that the group contains at least one phenyl group, and when it contains at least two phenyl groups, the phenyl groups are connected by a single bond, and exemplary examples 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 and are 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 the monocyclic aromatic group and the condensed aromatic group connected by a single bond also belong to the scope of aromatic groups, such as phenylnaphthyl, naphthylphenyl, phenylnaphthylphenyl, etc.

[0047] The C3-C30 heteroaryl group is preferably a C3-C20 heteroaryl group, including 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 exemplary examples include but are not limited to: pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, furanyl, thienyl, pyrrolyl, bipyridyl, phenylpyridyl, pyridylphenyl, pyrimidinylphenyl, etc. The fused ring heteroaryl group means 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 that are 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, indolcarbazolyl, azacarbazolyl, etc.), acridinyl, phenothiazinyl, phenoxazinyl, hydroacridinyl, etc. It should be noted that heteroaryl and heteroaryl groups connected by a single bond, and aryl and heteroaryl groups connected by a single bond also fall within the scope of heteroaryl groups, for example, phenyldibenzofuranyl, phenyldibenzothienyl, and the like.

[0048] Specific examples of the C6-C30 arylene group include divalent groups obtained by removing a hydrogen atom from the above-mentioned aryl groups; specific examples of the C3-C30 heteroarylene group include divalent groups obtained by removing a hydrogen atom from the above-mentioned heteroaryl groups.

[0049] 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, 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 and the like.

[0050] 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.

[0051] The C2-C20 alkenyl, preferably C2-C10 alkenyl, contains at least one C=C, illustratively including but not limited to: vinyl, propenyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, butadienyl, pentadienyl and the like.

[0052] The C3-C30 cycloalkyl group, C3-C20 cycloalkyl group, preferably C3-C10 cycloalkyl group, includes a monocyclic alkyl group or a polycyclic alkyl group. 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 carbon atoms on the ring; examples include but are not limited to: cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, etc.

[0053] 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.

[0054] The C6-C30 arylamino group, i.e. -NH 2 The monovalent group is formed after at least one H on the C3-C30 heteroarylamino group is replaced by the above-mentioned aryl group. 2 A monovalent group is formed when at least one H on the aryl group is substituted by the heteroaryl group listed above.

[0055] Preferably, the first organic electroluminescent material comprises 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:

[0056]

[0057] Among them, X, Ar 1 ,Ar 2 ,Ar 3 , L 1 , Z 1 , Z 2 , Z 3 , a, b, and c have the same defined ranges as those in Formula I.

[0058] Preferably, the Ar 1 ,Ar 2 ,Ar 3 Each is 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.

[0059] Preferably, the Ar 1 ,Ar 2,Ar 3 Each is independently selected from any one of the following substituted or unsubstituted groups:

[0060]

[0061] Wherein, -* represents the attachment site of the group.

[0062] Y 1 Selected from O, S, NR 11 or CR 12 R 13 Any one of .

[0063] 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 to form a ring through chemical bonds.

[0064] 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.

[0065] Preferably, Ar 1 ,Ar 2 ,Ar 3 The substituted substituents are each independently selected from any one of 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 or a combination of at least two thereof, and the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring through a chemical bond.

[0066] Preferably, Ar 1 ,Ar 2 ,Ar 3 The substituents are each independently selected from any one of C1-C6 straight or branched alkyl, phenyl, naphthyl, and biphenyl, and more preferably any one of methyl, ethyl, isopropyl, tert-butyl, tert-amyl, phenyl, naphthyl, and biphenyl.

[0067] Preferably, Ar 1 ,Ar 2 ,Ar 3 The substituents substituted in the above-mentioned are independently not connected to the adjacent ring structure or are connected to form a ring Cy by chemical bonds. 1 , the ring Cy 1 Any one selected from substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) alicyclic rings, substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) aromatic rings, substituted or unsubstituted C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroaromatic rings, more preferably The dotted line represents the ring Cy 1 fused key.

[0068] Preferably, the Ar 1 ,Ar 2 ,Ar 3 Each is independently selected from any one of the following groups:

[0069] -* represents the attachment site of the group.

[0070] Preferably, the L 1 Any one selected from a single bond, a substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) arylene, and a substituted or unsubstituted C5-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroarylene.

[0071] Preferably, the L 1 Any one selected from a single bond, a substituted or unsubstituted group:

[0072]

[0073] Represents the attachment site of the group.

[0074] Y 2 Selected from O, S, NR 21 or CR 22 R 23 Any of the following:

[0075] 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 to form a ring through chemical bonds.

[0076] 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, a C2-C10 (e.g., C3, C4, C5, C6, C7, C8, C9, etc.) alkenyl, or a C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl.

[0077] Preferably, the Y 2 It is O or S.

[0078] Preferably, the L 1 Selected from single bonds, Any one of the above represents the attachment site of the group.

[0079] Preferably, the Z 1 , Z 2 , Z 3 Each 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, C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) aryl, C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16 or C18, etc.) heteroaryl.

[0080] Preferably, a, b, and c are each independently 0 or 1.

[0081] Preferably, the first organic electroluminescent material is selected from any one or a combination of at least two of the following compounds P1-P258:

[0082]

[0083]

[0084]

[0085]

[0086]

[0087]

[0088]

[0089]

[0090]

[0091]

[0092]

[0093]

[0094]

[0095]

[0096]

[0097]

[0098]

[0099] Preferably, the second organic electroluminescent material comprises 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:

[0100]

[0101]

[0102] Among them, L 2 , L 3 , L 4 ,Ar 4 ,Ar 5 Having the same limited range as Formula II, R 1 , R 2 , R 3, d, e, and f have the same limited ranges as formula a; g is selected from an integer of 0-5, for example, it can be 0, 1, 2, 3, 4, or 5; h is selected from an integer of 0-3, for example, it can be 0, 1, 2, or 3.

[0103] The L 2 , L 3 , L 4 Each is 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;

[0104] Preferably, the L 2 , L 3 , L 4 Each is independently selected from a single bond, a substituted or unsubstituted group:

[0105] The attachment site of the representative group;

[0106] Y 3 Selected from O, S, NR 31 or CR 32 R 33 Any of the following:

[0107] 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 to form a ring through chemical bonds.

[0108] Preferably, the R 31 , R 32 , R 33 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, a C2-C10 (e.g., C3, C4, C5, C6, C7, C8, C9, etc.) alkenyl, or a C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, or C18, etc.) aryl.

[0109] Preferably, the Y 3 It is O or S.

[0110] Preferably, the L 2 , L 3 , L 4 are each independently selected from a single bond, Any one of, more preferably a single bond,

[0111] Represents the attachment site of the group.

[0112] Preferably, the Ar 4 ,Ar 5 Each is 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.

[0113] Preferably, the Ar 4 ,Ar 5 Each is independently selected from any one of the following substituted or unsubstituted groups:

[0114]

[0115] Represents the attachment site of the group.

[0116] Y 4 Selected from O, S, NR 41 or CR 42 R 43 Any one of .

[0117] 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 to form a ring through chemical bonds.

[0118] Preferably, the R 41 , R 42 , R 43 Each is independently selected from any one or a combination of at least two of a straight chain or branched chain alkyl group (e.g., C2, C3, C4, C5, C6, C7, C8, C9, etc.), a C2-C10 alkenyl group (e.g., C3, C4, C5, C6, C7, C8, C9, etc.), and a C6-C20 aryl group (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.).

[0119] Preferably, the Y 4It is O or S.

[0120] Preferably, Ar 4 ,Ar 5 The substituted substituents 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; the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring through chemical bonds.

[0121] Preferably, Ar 4 ,Ar 5 The substituents substituted in the above-mentioned group are each independently selected from any one of cyano, C1-C6 straight or branched alkyl, phenyl, naphthyl, biphenyl, and phenylnaphthyl, and are further preferably any one of cyano, methyl, ethyl, isopropyl, tert-butyl, tert-amyl, phenyl, naphthyl, biphenyl, and phenylnaphthyl.

[0122] Preferably, the Ar 4 ,Ar 5 Each is independently selected from any one of the following groups:

[0123] Represents the attachment site of the group.

[0124] Preferably, the R 1 , R 2 , R 3 Each 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, C3-C10 (e.g., C4, C5, C6, C7, C8, C9, etc.) cycloalkyl, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) aryl, C3-C20 (e.g., C4, C5, C6, C9, C10, C12, C14, C15, C16 or C18, etc.) heteroaryl.

[0125] Preferably, d, e, and f are each independently 0 or 1.

[0126] Preferably, g and h are each independently 0 or 1.

[0127] 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, E1-E16:

[0128]

[0129]

[0130]

[0131]

[0132]

[0133]

[0134]

[0135]

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

[0143]

[0144]

[0145]

[0146]

[0147]

[0148]

[0149] 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.

[0150] Preferably, the second organic electroluminescent material includes any one of the compounds having a structure shown in 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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%.

[0156] 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.

[0157] In a second aspect, the present invention provides a use of the electroluminescent material composition as described in the first aspect, wherein the electroluminescent material composition is applied to an organic electronic device.

[0158] 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.

[0159] Preferably, the electroluminescent material composition is applied to an organic electroluminescent device.

[0160] Preferably, the electroluminescent material composition is used as a light-emitting layer material in an organic electroluminescent device.

[0161] Preferably, the electroluminescent material composition is used as a host material of a light-emitting layer in an organic electroluminescent device.

[0162] 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.

[0163] 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.

[0164] Preferably, the organic layer comprises a light-emitting layer, and the light-emitting layer comprises the electroluminescent material composition as described in the first aspect.

[0165] 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, wherein the first organic electroluminescent material (first host material) is a hole-type host material having 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 transport balance between 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.

[0166] Preferably, the light-emitting layer further includes a doping material.

[0167] In the present invention, the term "dopant material" is also called "dye", "luminescent dye" or "guest material".

[0168] Preferably, the doping material is a phosphorescent doping material.

[0169] Preferably, based on 100% of the 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%.

[0170] 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.

[0171] Preferably, the organic layer further includes a hole transport region and an electron transport region.

[0172] 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.

[0173] 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.

[0174] In a preferred technical solution, the organic electroluminescent device (OLED device) comprises a first electrode and a second electrode, and an organic layer located between the electrodes. The organic layer can be divided into multiple regions, for example, 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.

[0175] In a preferred technical solution, the organic electroluminescent device comprises a first electrode, a plurality of light-emitting functional layers (organic layers) and a second electrode arranged in sequence; the organic layer comprises 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, and the hole injection layer is in contact with the first electrode (anode). The organic layer (preferably a light-emitting layer) comprises the electroluminescent material composition provided by the present invention.

[0176] In a preferred technical solution, a substrate can be used below the first electrode or above the second electrode. The substrate is glass or polymer material with excellent mechanical strength, thermal stability, water resistance and transparency. In addition, a thin film transistor (TFT) can also be provided on the substrate used as a display.

[0177] The first electrode can be formed by sputtering or depositing a material used as the first electrode on the substrate. When the first electrode is used as an anode, indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO 2 ), zinc oxide (ZnO) and other oxide transparent conductive materials and any combination thereof. When the first electrode is used 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), magnesium-silver (Mg-Ag) and the like and any combination thereof can be used.

[0178] 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, and a combination thereof.

[0179] 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 a single-layer hole transport layer containing only one compound and a single-layer hole transport layer containing multiple compounds. The hole transport region can also be a multilayer structure including at least one layer 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 light-emitting layer.

[0180] 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 in HT-1 to HT-52 below; or any combination thereof.

[0181]

[0182]

[0183]

[0184]

[0185] 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 compounds of HT-1 to HT-52 mentioned above, or one or more compounds of HI-1 to HI-3 described below; or one or more compounds of HT-1 to HT-52 can be doped with one or more compounds of HI-1 to HI-3 described below.

[0186]

[0187] The light-emitting layer includes a host material (Host, the electroluminescent material composition provided by the present invention), and also includes a light-emitting dye (i.e., a dopant) that can emit different wavelength spectra. The light-emitting layer can also be a monochrome light-emitting layer that emits a single color such as red, green, and blue. A plurality of monochrome light-emitting layers of different colors can be arranged in a plane according to a pixel pattern, or they can be stacked together to form a color light-emitting layer. When light-emitting layers of different colors are stacked together, they can be separated from each other or connected to each other. The light-emitting layer can also be a single color light-emitting layer that can emit different colors such as red, green, and blue at the same time.

[0188] Depending on the technology, the light-emitting layer material can be phosphorescent electroluminescent material. In an OLED device, a single light-emitting technology can be used, or a combination of multiple different light-emitting technologies can be used. These different light-emitting materials classified by technology can emit light of the same color or different colors.

[0189] 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).

[0190] 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.

[0191]

[0192] Where D is deuterium.

[0193] 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.

[0194]

[0195]

[0196] 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.

[0197]

[0198]

[0199] The organic layer may further include an electron transport region between the light-emitting layer and the cathode. The electron transport region may be an electron transport layer (ETL) of a single-layer structure, including a single-layer electron transport layer containing only one compound and a single-layer electron transport layer containing multiple compounds. The electron transport region may also be a multilayer structure including at least one layer 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.

[0200] 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.

[0201]

[0202]

[0203]

[0204]

[0205] 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 may be one or more compounds of the above ET-1 to ET-74, but is not limited thereto.

[0206] 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, Li 2 O、Cs 2 CO 3 , BaO, Na, Li, Ca, Mg, Yb.

[0207] In a fourth aspect, the present invention provides a display device, comprising the organic electroluminescent device as described in the third aspect.

[0208] Preferably, the display device includes a display screen or a display panel.

[0209] The present invention also provides an electronic device, which includes the above-mentioned display device.

[0210] Compared with the prior art, the present invention has the following beneficial effects:

[0211] 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. The electroluminescent material composition is used in organic electroluminescent devices, and is particularly suitable as a main material for a light-emitting layer, and can regulate the injection / transport balance of holes and electrons to avoid a large amount of carrier accumulation at the interface, so that the device has excellent luminous efficiency and stability, significantly prolongs the device life, and has a lower starting voltage, effectively improves the comprehensive performance of the device, and fully meets the requirements for high-performance materials in the current panel and display manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0212] Figure 1 A schematic diagram of the structure of an organic electroluminescent device provided in a specific embodiment of the present invention;

[0213] 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, and 11-external power supply. DETAILED DESCRIPTION

[0214] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0215] 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.

[0216] Example 1

[0217] 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), and the mass ratio of the two is 1:1.

[0218] The structural schematic diagram of an organic electroluminescent device comprising the electroluminescent material composition is shown in Figure 1 As shown, 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) which are stacked in sequence; an external power supply 11 is applied between the anode 2 and the cathode 10.

[0219] The preparation method of the organic electroluminescent device is as follows:

[0220] (1) a glass substrate coated with an ITO transparent conductive layer is 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 moisture is completely removed, cleaned with ultraviolet light and ozone, and bombarded with a low-energy cation beam;

[0221] (2) Place the glass substrate with the anode in a vacuum chamber and evacuate the chamber to a vacuum of less than 1×10 -5 Pa, vacuum evaporating a mixture of compound HT-4:HI-3 (97 / 3, w / w) on the above anode layer as a hole injection layer, the evaporation rate is 0.1 nm / s, and the thickness of the evaporation film is 10 nm;

[0222] (3) vacuum evaporating compound HT-4 on the hole injection layer as a hole transport layer, with an evaporation rate of 0.1 nm / s and a total evaporation film thickness of 60 nm;

[0223] (4) vacuum evaporating compound HT-52 on the hole transport layer as an electron blocking layer, with an evaporation rate of 0.1 nm / s and a total evaporation film thickness of 60 nm;

[0224] (5) vacuum evaporating the light-emitting layer of the device on the electron blocking layer, the light-emitting layer comprising a ternary mixture of a main material (the electroluminescent material composition, P8:A37=1:1) and a doping material (dye, RPD-14), the mass percentage of the doping material in the light-emitting layer being 3%; the evaporation rate being 0.1 nm / s, and the total evaporation film thickness being 40 nm;

[0225] (6) vacuum evaporating compound ET-74 on the light-emitting layer as a hole blocking layer, with an evaporation rate of 0.1 nm / s and a total evaporation film thickness of 5 nm;

[0226] (7) vacuum evaporating a mixture of compounds ET-69:ET-57 (50 / 50, w / w) on the hole blocking layer as an electron transport layer, with an evaporation rate of 0.1 nm / s and a total evaporation film thickness of 25 nm;

[0227] (8) Vacuum evaporating LiF with a thickness of 1 nm on the electron transport layer as an electron injection layer at a evaporation rate of 0.1 nm / s;

[0228] (9) A 150 nm thick metallic aluminum 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.

[0229] Examples 1-2 to 15-1, Comparative Examples 1 to 4

[0230] An electroluminescent material composition and an organic electroluminescent device comprising the same, which differs from Example 1-1 only in that the electroluminescent material composition (the main material of the light-emitting layer) is replaced by the compounds in Table 1 and Table 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 Table 1 and Table 2 represents the mass ratio of the first organic electroluminescent material to the second organic electroluminescent material, and "--" means that the compound is not added / the ratio does not exist.

[0231] The main materials in the comparative example are as follows:

[0232]

[0233] Performance Test:

[0234] At the same brightness of 3000cd / m 2 Under the condition of 100 ℃ and 80 ℃, the voltage and current density of the organic electroluminescent device are measured using a digital source meter and a brightness meter. The ratio of brightness to current density is the current efficiency.

[0235] 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.

[0236] Table 1

[0237]

[0238]

[0239]

[0240]

[0241] Table 2

[0242]

[0243]

[0244] 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, and 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 comprehensive performance. In addition, although Ref4 and the second organic electroluminescent material of the structure shown in Formula II defined in the present invention both contain a triazine structure, they are essentially different. Compared with them, the present invention has a larger conjugated structure, 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.

[0245] The applicant declares that the present invention illustrates the electroluminescent material composition and the organic electroluminescent device of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned process steps, that is, it does not mean that the present invention must rely on the above-mentioned process steps to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope 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 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 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, or a combination of at least two thereof; the substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring through chemical bonds.

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: Wherein, -* 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 above, -* 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 above, -* 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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