Host material, double-host organic electroluminescent material containing host material and organic electroluminescent device

Abstract

The invention belongs to the field of organic electroluminescent materials, and provides a host material, a double-host organic electroluminescent material containing the host material and an organic electroluminescent device. The double-main-body organic electroluminescent material comprises a first main body material and a second main body material, the mass ratio of the first main body material to the second main body material is 1: 1, and the specific structure is shown in the specification. The dual-host organic electroluminescent material provided by the invention is applied to a specific luminescent device, and has the advantages of low driving voltage, high luminous efficiency and long service life.

Description

Technical Field

[0001] The invention belongs to the field of organic electroluminescent materials, and in particular relates to a host material, a dual-host organic electroluminescent material containing the host material, and an organic electroluminescent device. Background Art

[0002] Organic light-emitting diodes (OLEDs) can be used to manufacture new display products and new lighting products, and their market application prospects are very broad. Currently, OLED display technology has been applied to smart phones, tablet computers and other fields, but compared with the actual product application requirements, the performance of OLED such as luminous efficiency and service life needs to be further improved.

[0003] The OLED structure includes an electrode material film layer and an organic functional material sandwiched between different electrode film layers. As a current device, when a voltage is applied to the electrodes at both ends of the OLED, the positive and negative charges in the organic layer functional material film layer are separated by the electric field, and the positive and negative charges are further recombined in the light-emitting layer, that is, OLED electroluminescence is generated. Since the radiative transition of triplet excitons of most organic molecules is forbidden and contributes little to electroluminescence, the triplet excitons of organic molecules can be transferred to the triplet state of the metal complex by doping with organic metal complexes such as platinum, iridium, and osmium, thereby improving the efficiency of the organic light-emitting device. Therefore, the efficiency of the OLED can be improved by doping the host and guest in the light-emitting layer, but the triplet excitons will produce triplet-triplet annihilation (TTA) during the transfer process, resulting in energy loss, causing the efficiency of the organic light-emitting device to roll off.

[0004] At present, the poor performance of organic electroluminescent devices is still a technical problem that needs to be urgently solved during their use. For example, there are problems such as excessively high driving voltage, low luminous efficiency or short life, which all affect the application areas of organic electroluminescent devices.

[0005] Therefore, how to provide an organic electroluminescent material containing a dual host with a long life and a low driving voltage and a preparation method thereof and an organic electroluminescent device is a technical problem that those skilled in the art need to solve urgently. Summary of the invention

[0006] In view of this, the present invention provides a host material, a dual-host organic electroluminescent material containing the host material, and an organic electroluminescent device. The dual-host organic electroluminescent material described in the present invention is applied to a specific light-emitting device, which has low driving voltage, high luminous efficiency and long service life.

[0007] It should be noted that the present invention provides an organic electroluminescent device containing a dual-host organic electroluminescent material of a triazine structure. Indolecarbazole is a larger conjugated plane, and still has a relatively planar configuration after being connected to a carbazole group. Adding benzene substitution at the carbazole position increases the stereoregularity of the structure, avoids the aggregation quenching effect caused by the plane stacking of the structure during the structure evaporation process, and improves the lifespan; at the same time, the structure with stronger stereoregularity effectively reduces the evaporation temperature, ensures the thermal stability of the material during the evaporation process, and improves the service life of the material. The organic electroluminescent device of the present invention disperses triplet excitons on two hosts by using a dual-host material, reduces triplet-triplet annihilation (TTA), and can improve the luminous efficiency and service life of the device while reducing the driving voltage of the organic electroluminescent device.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] The first technical purpose of the present invention is to provide a main material, wherein the main material has a structure as shown in general formula 1:

[0010]

[0011] Wherein, R1 and R2 are the same or different from each other and are independently selected from substituted or unsubstituted C6-C30 aryl groups and C3-C30 heteroaryl groups; the heteroatom in the heteroaryl group is selected from O, N or S;

[0012] R3 is selected from substituted or unsubstituted C6-C40 aryl, substituted or unsubstituted C3-C40 heteroaryl; the heteroatom in the heteroaryl is selected from O, N or S.

[0013] Further, R1 and R2 are the same or different from each other, and are independently selected from substituted or unsubstituted phenyl, biphenyl, terphenyl, naphthyl, dibenzofuranyl, dibenzothiophenyl, dibenzofluorenyl, carbazolyl, pyridyl;

[0014] R3 represents mono-, di-, tri- or tetra-substitution and is selected from substituted or unsubstituted phenyl, biphenyl, terphenyl, naphthyl, dibenzofuranyl, dibenzothiophenyl, dibenzofluorenyl, carbazolyl, pyridyl, phenanthryl and triphenylenyl.

[0015] In the above technical scheme, the substituent of the "substituted" group is selected from one or a combination of at least two of deuterium, fluorine, trifluoromethyl, cyano, C1-C10 alkyl, C1-C10 alkoxy, C3-C10 cycloalkyl or C6-C12 aryl, C6-C20 heteroaryl, and the heteroatom in the heteroaryl is selected from O, N or S.

[0016] Furthermore, in the present invention, all hydrogen atoms in the formula may be all unsubstituted by deuterium, all substituted by deuterium, or partially substituted by deuterium.

[0017] In the technical solution of the present invention, the main material specifically has the following structure, but is not limited to the following structure:

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

[0043] The above are some specific structural forms of the main materials, but are not limited to the listed chemical structures. All compounds with simple changes of groups within the defined range based on the general structural formula shown in Formula 1 should be included.

[0044] The second technical purpose of the present invention is to provide a dual-host organic electroluminescent material, wherein the dual-host organic electroluminescent material comprises a first host material and a second host material, and the mass ratio of the first host material to the second host material is 1:1; the first host material is the host material as described above, and the second host material has a structure shown in Formula 2:

[0045]

[0046] wherein D1, D2 and D3 are each independently selected from substituted or unsubstituted C6-C42 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C9-C60 fused aryl, substituted or unsubstituted C9-C60 fused heteroaryl, and the heteroatom is selected from O, S, and N;

[0047] L1 and L2 are each independently selected from a linking bond, a substituted or unsubstituted C6-C30 aryl group.

[0048] Further, D1 and D2 are each independently selected from substituted or unsubstituted C6-C18 aryl groups; D3 is selected from substituted or unsubstituted C6-C36 aryl groups, substituted or unsubstituted C3-C30 heteroaryl groups; L1 and L2 are each independently selected from connecting bonds, substituted or unsubstituted C6-C18 aryl groups.

[0049] Furthermore, D1 is selected from substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl or substituted or unsubstituted terphenyl, and D2 is selected from substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl or substituted or unsubstituted triphenyl, D3 is selected from substituted or unsubstituted C6-C30 Aryl, a substituted or unsubstituted C3-C30 heteroaryl group, a substituted or unsubstituted C9-C30 fused aryl group, or a substituted or unsubstituted C9-C30 fused heteroaryl group; L1 is a connecting bond, and L2 is a connecting bond, a phenyl group or a naphthyl group.

[0050] It should be noted that, in the present invention, heteroaryl refers to a monocyclic aromatic group or a polycyclic aromatic group including at least one heteroatom, and the heteroatom includes but is not limited to O, S, and N.

[0051] Furthermore, in the second host material, the substituent in the substituted group is selected from deuterium, fluorine, C1-C10 alkyl, deuterium-substituted C1-C10 alkyl, C3-C10 cycloalkyl, three-membered to ten-membered heterocycloalkyl, and the heteroatom in the heterocycloalkyl is selected from O, S, and N; or is any one or a combination of at least two of the following groups:

[0052] The dashed lines represent the attachment sites of the groups.

[0053] In the technical solution of the present invention, all hydrogen atoms in the formula may be completely unsubstituted by deuterium, completely substituted by deuterium, or partially substituted by deuterium.

[0054] It should be noted that the substituted or unsubstituted means that the group may not be substituted or may be substituted by one or more substituents, and the substitution means that the hydrogen atom bonded to the carbon atom of the compound is changed into another substituent, and the position of the substitution is not limited, as long as the position is the position where the hydrogen atom is substituted, that is, the position where the substituent can be substituted, and when two or more substituents are substituted, the two or more substituents may be the same as or different from each other.

[0055] In the technical solution of the present invention, the second host material is selected from any one of the following compounds, but is not limited thereto:

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

[0063]

[0064]

[0065]

[0066]

[0067]

[0068]

[0069] The above are some specific structural forms of the second host material, but are not limited to the listed chemical structures. All compounds based on the general structural formula shown in Formula 2, where D1, D2, D3, L1 and L2 groups are simple changes of all groups within the previously defined range should be included.

[0070] The present invention also provides a method for preparing the first host material and the second host material. The specific steps and conditions of the preparation method are as follows:

[0071] 1. The preparation method of intermediate product G001-a is as follows:

[0072]

[0073] 2-Bromobenzo[9,10]phenanthrene (49.14 g, 180 mmol), pinacol boronic acid ester (137.12 g, 540 mmol), [1,1'-bis(diphenylphosphino)ferrocene]dichloropalladium dichloromethane complex (14.7 g, 18 mmol) and potassium acetate (70.7 g, 720 mmol) were added to a flask, followed by 1,4-dioxane (500 mL), which was degassed and heated at 105° C. for 16 hours; after cooling to room temperature, the reaction mixture was diluted with water and ethyl acetate; the organic phase was separated, washed with brine, and dried over MgSO4; the solvent was evaporated, and the residue was purified by silica gel column chromatography using petroleum ether (PE) / dichloromethane (DCM) (volume ratio of 4 / 1 to 3 / 2) as the eluent, and recrystallized from heptane to give (triphenylene-2-yl)pinacol boronic acid ester (16.5 g, 67.5%).

[0074]

[0075] (Triphenylene-2-yl)boronic acid pinacol ester (28.3 g, 141 mmol), 1-bromo-2-nitrobenzene (4.94 g, 70.3 mmol), tetrakis(triphenylphosphine)palladium (8.12 g, 7.03 mmol) and potassium carbonate (38.9 g, 281 mmol) were added to a flask, followed by toluene (100 mL), ethanol (50 mL) and water (50 mL), which were degassed and heated at 100° C. for 20 hours; after cooling to room temperature, the reaction mixture was diluted with water and ethyl acetate; the organic phase was separated, washed with brine, and dried over MgSO4; the solvent was evaporated, and the residue was purified by silica gel column chromatography with petroleum ether (PE) / dichloromethane (DCM) (volume ratio of 4 / 1 to 3 / 2) as eluent, and recrystallized from heptane to give 2-(2-nitrophenyl)triphenylene (16.5 g, 67.5%) as a yellow solid.

[0076]

[0077] 2-(2-Nitrophenyl)benzophenanthrene (15.7 g, 45 mmol), triethyl phosphite (29.9 g, 180 mmol) and o-dichlorobenzene (200 ml) were degassed under nitrogen and refluxed for 24 hours; the solvent was evaporated, and the residue was purified by silica gel column chromatography with PE / DCM (volume ratio 4 / 1 to 2 / 3) as eluent, and recrystallized from heptane to give (G001-a)10H-phenanthro[9,10-b]carbazole (5.9 g, 40.2%) as a white solid.

[0078] 2. Synthesis of the first host material shown in Formula 1;

[0079] In the present invention, the method for preparing the compound having the structure shown in Formula 1 comprises the following steps:

[0080] (1) Reactant a and reactant b react to obtain compound R-1, and the reaction formula is as follows:

[0081]

[0082] (2) Compound R-1 reacts with reactant c to obtain compound R-2, and the reaction formula is as follows:

[0083]

[0084] (3) Compound R-2 reacts with reactant d to obtain compound R-2-1, and the reaction formula is as follows:

[0085]

[0086] (4) Compound R-2-1 reacts with reactant e to obtain compound R-2-2, and the reaction formula is as follows:

[0087]

[0088] (5) Compound R-2-2 reacts with reactant f to obtain compound R-2-3, the reaction formula is as follows:

[0089]

[0090] (6) Compound R-2-3 reacts with G001-a to obtain a compound having a structure shown in Formula 1, and the reaction formula is as follows:

[0091]

[0092] Preferably, in steps (1)(2)(4)(5), the molar ratio of reactant a to reactant b, compound R-1 to reactant c, reactant e to compound R-2-1, and compound R-2-2 to reactant f is 1:1-1.2, for example, 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.18 or 1:1.2.

[0093] Preferably, the reactions in steps (1), (2), (4), and (5) are carried out in the presence of an alkaline substance.

[0094] Preferably, the alkaline substance is selected from sodium carbonate and / or potassium carbonate.

[0095] Preferably, the molar ratio of the alkaline substance to reactant a, the alkaline substance to R-1, the alkaline substance to reactant e, and the alkaline substance to R-2-2 is 2-3:1, for example, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1 or 3:1.

[0096] Preferably, the reactions in steps (1), (2), (4), and (5) are carried out in the presence of a catalyst.

[0097] Preferably, the catalyst is selected from tetrakistriphenylphosphine palladium.

[0098] Preferably, the molar ratio of the catalyst to reactant a, the catalyst to R-1, the catalyst to reactant e, and the catalyst to R-2-2 is 0.02-0.03:1, for example 0.02:1, 0.025:1, 0.028:1 or 0.03:1.

[0099] Preferably, the reactions in steps (1), (2), (4), and (5) are carried out in the presence of a phosphine ligand.

[0100] Preferably, the phosphine ligand is selected from any one of tri-tert-butylphosphine, 2-cyclohexyl-2,4,6-triisopropylbiphenyl, triethylphosphine, trimethylphosphine, triphenylphosphine, potassium diphenylphosphine, and di-tert-butylphosphine chloride, or a combination of at least two thereof.

[0101] Preferably, the molar ratios of the phosphine ligand to reactant a, the phosphine ligand to R-1, the phosphine ligand to reactant e, and the phosphine ligand to R-2-2 are all 0.04-0.06:1, for example 0.04:1, 0.045:1, 0.05:1, 0.055:1 or 0.06:1.

[0102] Preferably, the reactions in steps (1), (2), (4) and (5) are carried out in an organic solvent selected from toluene, ethanol and water in a ratio of 2:1:1.

[0103] Preferably, the reaction temperature of steps (1), (2), (4), (5) is 90-100°C, such as 90°C, 93°C, 95°C, 98°C or 100°C, and the reaction time is 20-24h, such as 20h, 22h or 24h.

[0104] Preferably, the molar ratio of step (3) R-2 to reactant d is 1:2-3, for example 1:2, 1:2.25, 1:2.5, 1:2.7, 1:2.75 or 1:3.

[0105] Preferably, the reaction in step (3) is carried out in the presence of an alkaline substance.

[0106] Preferably, the alkaline substance is selected from potassium acetate.

[0107] Preferably, the molar ratio of the alkaline substance to R-2 is 2-3:1, for example 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1 or 3:1.

[0108] Preferably, the reaction in step (3) is carried out in the presence of a catalyst.

[0109] Preferably, the catalyst is selected from [1,1'-bis(diphenylphosphino)ferrocene]dichloropalladium dichloromethane complex.

[0110] Preferably, the molar ratio of the catalyst to R-2 is 0.02-0.03:1, such as 0.02:1, 0.025:1, 0.028:1 or 0.03:1.

[0111] Preferably, the reaction in step (3) is carried out in the presence of a phosphine ligand.

[0112] Preferably, the phosphine ligand is selected from any one of tri-tert-butylphosphine, 2-cyclohexyl-2,4,6-triisopropylbiphenyl, triethylphosphine, trimethylphosphine, triphenylphosphine, potassium diphenylphosphine, and di-tert-butylphosphine chloride, or a combination of at least two thereof.

[0113] Preferably, the molar ratio of the phosphine ligand to R-2 is 0.04-0.06:1, such as 0.04:1, 0.045:1, 0.05:1, 0.055:1 or 0.06:1.

[0114] Preferably, the reaction in step (3) is carried out in an organic solvent, and the organic solvent is selected from 1,4-dioxane.

[0115] Preferably, the reaction temperature in step (3) is 90-105°C, such as 90°C, 95°C, 98°C, 100°C or 105°C, and the reaction time is 20-24h, such as 20h, 22h or 24h.

[0116] Preferably, in step (6), the molar ratio of R-2-3 to G001-a is 1:1-1.2, for example 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.18 or 1:1.2.

[0117] Preferably, the reaction in step (6) is carried out in the presence of an alkaline substance.

[0118] Preferably, the alkaline substance is selected from sodium tert-butoxide and / or potassium tert-butoxide.

[0119] Preferably, the molar ratio of the alkaline substance to R-2-3 is 2-3:1, for example 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1 or 3:1.

[0120] Preferably, the reaction in step (6) is carried out in the presence of a catalyst.

[0121] Preferably, the catalyst is selected from tris(dibenzylideneacetone)bispalladium.

[0122] Preferably, the molar ratio of the catalyst to R-2-3 is 0.02-0.03:1, such as 0.02:1, 0.025:1, 0.028:1 or 0.03:1.

[0123] Preferably, the reaction in step (6) is carried out in the presence of a phosphine ligand.

[0124] Preferably, the phosphine ligand is selected from any one of tri-tert-butylphosphine, 2-cyclohexyl-2,4,6-triisopropylbiphenyl, triethylphosphine, trimethylphosphine, triphenylphosphine, potassium diphenylphosphine, and di-tert-butylphosphine chloride, or a combination of at least two thereof.

[0125] Preferably, the molar ratio of the phosphine ligand to R-2-3 is 0.04-0.06:1, such as 0.04:1, 0.045:1, 0.05:1, 0.055:1 or 0.06:1.

[0126] Preferably, the reaction in step (6) is carried out in an organic solvent, and the organic solvent is selected from toluene, ethanol and water in a ratio of 2:1:1.

[0127] Preferably, the reaction temperature in step (6) is 90-100°C, such as 90°C, 93°C, 95°C, 98°C or 100°C, and the reaction time is 20-24h, such as 20h, 22h or 24h.

[0128] As a preferred technical solution, the method for preparing the compound having the structure shown in Formula 1 specifically comprises the following steps:

[0129] (1) Under nitrogen protection, weigh compound reactant a (1 eq), reactant b (1-1.2 eq), and potassium carbonate (2-3 eq) and put them into the reaction system, add toluene, ethanol and water, tetrakistriphenylphosphine palladium (0.02-0.03 eq) and tri-tert-butylphosphine (0.04-0.06 eq), reflux at 90-100° C. for 24 h under nitrogen protection, then cool to 25° C., add purified water, stir for 30 min, stand for stratification, separate the layers, and perform column chromatography to obtain compound R-1.

[0130] (2) Under nitrogen protection, compound R-1 (1 eq), reactant c (1-1.2 eq), and potassium carbonate (2-3 eq) were weighed and put into the reaction system, and toluene, ethanol and water, tetrakistriphenylphosphine palladium (0.02-0.03 eq) and tri-tert-butylphosphine (0.04-0.06 eq) were added. The mixture was refluxed at 90-100° C. for 24 h under nitrogen protection, and then cooled to 25° C., purified water was added, and the mixture was stirred for 30 min, and then allowed to stand for stratification, separated, and subjected to column chromatography to obtain compound R-2.

[0131] (3) Under nitrogen protection, compound R-2 (1 eq), reactant d (2-3 eq), and potassium acetate (2-3 eq) were weighed and put into the reaction system, 1,4-dioxane and [1,1'-bis(diphenylphosphino)ferrocene] dichloropalladium dichloromethane complex (0.02-0.03 eq) were added, and the mixture was refluxed at 90-100°C for 24 h under nitrogen protection, then cooled to 25°C, purified water was added, stirred for 30 min, and then allowed to stand to separate the layers, separated the layers, and subjected to column chromatography to obtain compound R-2-1.

[0132] (4) Under nitrogen protection, reactant e (1 eq), compound R-2-1 (1-1.2 eq), and potassium carbonate (2-3 eq) were weighed and put into the reaction system, and toluene, ethanol and water, tetrakistriphenylphosphine palladium (0.02-0.03 eq) and tri-tert-butylphosphine (0.04-0.06 eq) were added. The mixture was refluxed at 90-100°C for 24 h under nitrogen protection, and then cooled to 25°C. Purified water was added, stirred for 30 min, and then allowed to stand for stratification, separated, and subjected to column chromatography to obtain compound R-2-2.

[0133] (5) Under nitrogen protection, compound R-2-2 (1 eq), reactant f (1-1.2 eq), and potassium carbonate (2-3 eq) were weighed and put into the reaction system, and toluene, ethanol and water, tetrakistriphenylphosphine palladium (0.02-0.03 eq) and tri-tert-butylphosphine (0.04-0.06 eq) were added. The mixture was refluxed at 90-100°C for 24 h under nitrogen protection, and then cooled to 25°C. Purified water was added, stirred for 30 min, and then allowed to stand for stratification, separated, and subjected to column chromatography to obtain compound R-2-3.

[0134] (6) Under nitrogen protection, compound R-2-3 (1 eq), reactant G001-a (1-1.2 eq), and potassium carbonate (2-3 eq) were weighed and put into the reaction system, and toluene, tri(dibenzylideneacetone)palladium (0.02-0.03 eq) and tri-tert-butylphosphine (0.04-0.06 eq) were added. The mixture was refluxed at 90-100°C for 24 h under nitrogen protection, and then cooled to 25°C. Purified water was added, and the mixture was stirred for 30 min and allowed to stand for stratification. The mixture was separated and subjected to column chromatography to obtain the compound represented by Formula 1.

[0135] 3. Synthesis of the Second Main Material

[0136] In the present invention, the method for preparing the compound having the structure shown in Formula 2 comprises the following steps:

[0137] (A) Reactant I reacts with reactant II to obtain compound H-1, and the reaction formula is as follows:

[0138]

[0139] (B) Compound H-1 reacts with reactant II-1 to obtain compound H-2, and the reaction formula is as follows:

[0140]

[0141] (C) Compound H-2 reacts with reactant II-2 to obtain a compound represented by formula 2, and the reaction formula is as follows:

[0142]

[0143] Preferably, in step (A), the molar ratio of reactant I to reactant II is 1:1-1.2, for example, 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.18 or 1:1.2.

[0144] Preferably, the reaction in step (A) is carried out in the presence of a basic substance.

[0145] Preferably, the alkaline substance is selected from potassium carbonate and / or cesium carbonate.

[0146] Preferably, the molar ratio of the alkaline substance to the reactant I is 3-4:1, for example 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1 or 4:1.

[0147] Preferably, the reaction in step (A) is carried out in the presence of a catalyst.

[0148] Preferably, the catalyst is selected from tetrakis(triphenylphosphine)palladium.

[0149] Preferably, the molar ratio of the catalyst to the reactant I is 0.05-0.08:1, for example 0.05:1, 0.06:1, 0.07:1 or 0.08:1.

[0150] Preferably, the reaction in step (A) is carried out in a solvent selected from a mixture of toluene, ethanol and water in a volume ratio of 2:1:1.

[0151] Preferably, the reaction temperature in step (A) is 90° C. and the reaction time is 20-24 h.

[0152] Preferably, in step (B), the molar ratio of the compound H-1 to the reactant II-1 is 1:1-1.2, for example 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.18 or 1:1.2.

[0153] Preferably, the reaction in step (B) is carried out in the presence of a basic substance.

[0154] Preferably, the alkaline substance is selected from potassium carbonate and / or cesium carbonate.

[0155] Preferably, the molar ratio of the alkaline substance to compound H-1 is 3-4:1, for example 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1 or 4:1.

[0156] Preferably, the reaction in step (B) is carried out in the presence of a catalyst.

[0157] Preferably, the catalyst is selected from tetrakis(triphenylphosphine)palladium.

[0158] Preferably, the molar ratio of the catalyst to compound H-1 is 0.05-0.08:1, such as 0.05:1, 0.06:1, 0.07:1 or 0.08:1.

[0159] Preferably, the reaction in step (B) is carried out in a solvent selected from a mixture of toluene, ethanol and water in a volume ratio of 2:1:1.

[0160] Preferably, the reaction temperature in step (B) is 90-100°C, such as 90°C, 93°C, 95°C, 98°C or 100°C, and the reaction time is 20-24h.

[0161] Preferably, in step (C), the molar ratio of the compound H-2 to the reactant II-2 is 1:1-1.2, for example 1:1, 1:1.05, 1:1.1, 1:1.15, 1:1.18 or 1:1.2.

[0162] Preferably, the reaction in step (C) is carried out in the presence of a basic substance.

[0163] Preferably, the alkaline substance is selected from potassium carbonate and / or cesium carbonate.

[0164] Preferably, the molar ratio of the alkaline substance to compound H-2 is 3-4:1, for example 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1 or 4:1.

[0165] Preferably, the reaction in step (C) is carried out in the presence of a catalyst.

[0166] Preferably, the catalyst is selected from tetrakis(triphenylphosphine)palladium.

[0167] Preferably, the molar ratio of the catalyst to compound H-2 is 0.05-0.08:1, such as 0.05:1, 0.06:1, 0.07:1 or 0.08:1.

[0168] Preferably, the reaction in step (C) is carried out in a solvent selected from a mixture of toluene, ethanol and water in a volume ratio of 2:1:1.

[0169] Preferably, the reaction temperature in step (C) is 90-100°C, such as 90°C, 93°C, 95°C, 98°C or 100°C, and the reaction time is 20-24h, such as 20h, 22h or 24h.

[0170] As a preferred technical solution, the method for preparing the compound of the structure shown in general formula 2 of the present invention specifically comprises the following steps:

[0171] (1) Under nitrogen protection, reactant 1 (1 eq), reactant 2 (1-1.2 eq), and potassium carbonate (3-4 eq) were weighed and placed in a reaction system, and toluene, ethanol, water, and catalyst tetrakis(triphenylphosphine)palladium (0.05-0.08 eq) were added. The mixture was refluxed at 90° C. for 24 h under nitrogen protection, then cooled to 25° C., filtered, and subjected to solid column chromatography to obtain the compound H-1 shown;

[0172] (2) Under nitrogen protection, weigh H-1 (1 eq), reactant 2-1 (1-1.2 eq), and potassium carbonate (3-4 eq) into the reaction system, add toluene, ethanol, water, and catalyst tetrakis(triphenylphosphine)palladium (0.05-0.08 eq), reflux at 90-100° C. for 24 h under nitrogen protection, then cool to 25° C., filter, and solid column chromatography to obtain the compound H-2 shown;

[0173] (3) Under nitrogen protection, H-2 (1 eq), reactant 2-2 (1-1.2 eq), and potassium carbonate (3-4 eq) were weighed and put into the reaction system, and toluene, ethanol, water, and catalyst tetrakis(triphenylphosphine)palladium (0.05-0.08 eq) were added. The mixture was refluxed at 90-100° C. for 24 h under nitrogen protection, and then cooled to 25° C., filtered, and solid column chromatography was performed to obtain a compound with the structure shown in the general formula 2.

[0174] In another aspect, the present invention provides an organic electroluminescent device, wherein the organic electroluminescent device comprises the organic electroluminescent host material as described above or the dual-host organic electroluminescent material as described above.

[0175] The organic electroluminescent device comprises a first electrode (anode), an organic electroluminescent material layer, and a second electrode (cathode); the organic electroluminescent material layer comprises a light-emitting layer, and the light-emitting layer comprises a doping material and the organic electroluminescent host material as described above or the dual-host organic electroluminescent material as described above.

[0176] Preferably, the mass ratio of the dual-host organic electroluminescent material and the doping material is (1-99):(99-1), for example, 1:99, 2:98, 5:95, 8:92, 10:90, 15:85, 20:80, 25:75, 30:70, 35:65, 38:62, 40:60, 45:55, 50:50, 55:45, 58:42, 60:40, 65:35, 70:30, 75:25, 80:20, 85:15, 88:12, 90:10, 95:5, 98:2 or 99:1, etc.

[0177] In the present invention, the organic electroluminescent device comprises an anode, a hole transport region, a light emitting layer, an electron transport region and a cathode. Specifically,

[0178] The anode material preferably has a material with a large work function so that holes can be smoothly injected into the organic material layer. The anode material includes: metals (such as vanadium, chromium, copper, zinc and gold), metal alloys, metal oxides (such as zinc oxide, indium oxide, indium tin oxide (ITO) and indium zinc oxide (IZO)), combinations of metals and oxides (such as ZnO:Al or SnO2:Sb), conductive polymers (such as poly(3-methylthiophene), poly[3,4-(ethylene-1,2-dioxy)thiophene] (PEDOT), polypyrrole and polyaniline), but is not limited thereto.

[0179] The cathode material preferably has a material with a small work function so that electrons can be smoothly injected into the organic material layer. The cathode material includes: metals (such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin and lead), metal alloys or multilayer structure materials (such as LiF / Al or LiO2 / Al); but is not limited to these.

[0180] The hole transport region includes a hole injection layer, a hole transport layer, an electron blocking layer and a hole blocking layer, and the light emitting layer is located between the electron blocking layer and the hole blocking layer.

[0181] Wherein, the hole injection layer material is a material that receives holes from the anode at a low voltage, and the highest occupied molecular orbital (HOMO) of the hole injection material is preferably between the work function of the anode material and the HOMO of the surrounding organic material layer. The hole injection material includes metal porphyrin, oligothiophene, organic material based on arylamine, organic material based on hexanitrile hexaazatriphenylene, organic material based on quinacridone, organic material based on perylene, anthraquinone, and conductive polymers based on polyaniline and polythiophene.

[0182] The hole transport layer material is a material that can receive holes from the anode or the hole injection layer and transport the holes to the light-emitting layer and has high hole mobility. The hole transport layer material includes an organic material based on arylamine, a conductive polymer, and a block copolymer having both a conjugated part and a non-conjugated part, but is not limited thereto.

[0183] The electron blocking layer is disposed between the hole transport layer and the light emitting layer, and the electron blocking layer material includes an arylamine-based organic material.

[0184] The hole blocking layer is disposed between the hole transport layer and the light emitting layer, and the hole blocking layer material includes a triazine-based compound.

[0185] The electron transport region includes an electron transport layer and an electron injection layer.

[0186] The electron transport layer has the function of promoting electron transport. The electron transport material is a material with high electron mobility that receives electrons from the cathode and transports the electrons to the light-emitting layer. The electron transport material includes an Al complex of 8-hydroxyquinoline, a complex of Alq3, an organic free radical compound, and a hydroxyflavone-metal complex, but is not limited thereto. The thickness of the electron transport layer is 1 nm to 50 nm, which can prevent the electron transport characteristics from decreasing and prevent the driving voltage from increasing.

[0187] The electron injection layer has the function of promoting electron injection, and the electron injection material is a material that has the ability to transport electrons, has excellent electron injection effect on the light-emitting layer or the light-emitting material, prevents the excitons generated in the light-emitting layer from migrating to the hole injection layer, and has excellent thin film forming ability. The electron injection layer material includes fluorenone, anthraquinone dimethane, diphenoquinone, thiopyran dioxide, azole, diazole, triazole, imidazole, perylene tetracarboxylic acid, fluorenyl methane, anthrone, etc. and their derivatives, metal complexes, nitrogen-containing five-membered ring derivatives, but is not limited thereto.

[0188] In the present invention, the organic electroluminescent device may be a top emission type, a bottom emission type or a double-side emission type.

[0189] The organic electroluminescent device can be used in organic solar cells, electronic paper, organic photoreceptors or organic thin film transistors.

[0190] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0191] The dual-host organic electroluminescent material disclosed in the present invention includes a first host material and a second host material. By using the dual-host material, triplet excitons can be dispersed on two hosts, which can reduce triplet-triplet annihilation (TTA). When applied to organic electroluminescent devices, the driving voltage can be effectively reduced, and the luminous efficiency and service life of the device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0192] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0193] Figure 1 This is the hydrogen nuclear magnetic resonance spectrum of compound G001 in Example 1 of the present invention. DETAILED DESCRIPTION

[0194] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0195] The embodiment of the present invention discloses a host material and a method for preparing a dual-host organic electroluminescent material containing the host material.

[0196] In addition, it should be noted that the numerical values ​​given in the following examples are as accurate as possible, but those skilled in the art understand that due to unavoidable measurement errors and experimental operation problems, each number should be understood as an approximate number rather than an absolutely accurate value.

[0197] Example 1: Preparation of Compound G001

[0198] The synthetic route is as follows:

[0199]

[0200] Under a nitrogen atmosphere, 271.14 mmol of reactant 4 (CAS: 108-77-0), 271.14 mmol of reactant 5 (CAS: 98-80-6), and 813.43 mmol of potassium carbonate were weighed into the reaction system, and 500 ml of toluene, 250 ml of ethanol, 250 ml of water, and 13.56 mmol of catalyst tetrakis(triphenylphosphine)palladium were added. The mixture was refluxed at 90° C. for 24 h under nitrogen protection, and then cooled to 25° C., filtered, and subjected to solid column chromatography to obtain the compound G001-1 shown (test value: 226.98, 38.5 g, yield: 62.5%) with an HPLC purity greater than 99%.

[0201]

[0202] Under nitrogen atmosphere, weigh G001-1 (135.57 mmol) solid and 135.57 mmol reactant 5 (CAS: 98-80-6), 406.72 mmol potassium carbonate were put into the reaction system, 250 ml toluene, 125 ml ethanol, 125 ml water, 6.78 mmol catalyst tetrakis(triphenylphosphine)palladium were added, refluxed at 90 ° C for 24 h under nitrogen protection, then cooled to 25 ° C, filtered, and solid column chromatography were performed to obtain the compound G001-2 shown (test value: 269.05, 22.25 g, yield 61%), and its HPLC purity was greater than 99%.

[0203]

[0204] Under nitrogen atmosphere, weigh G001-2 (67.79 mmol) solid and 67.79 mmol reactant 6 (CAS: 1383531-53-0), 203.36 mmol potassium carbonate were put into the reaction system, 125 ml toluene, 63 ml ethanol, 63 ml water, 3.39 mmol catalyst tetrakis(triphenylphosphine)palladium were added, refluxed at 90 ° C for 24 h under nitrogen protection, then cooled to 25 ° C, filtered, and solid column chromatography were performed to obtain the compound G001-3 shown (test value: 454.08, 17.3 g, yield 56.2%), and its HPLC purity was greater than 99%.

[0205]

[0206] Under a nitrogen atmosphere, 22.58 mmol of G001-3, 22.58 mmol of G001-a, and 45.25 mmol of sodium tert-butoxide were weighed into the reaction system, and 150 ml of toluene, 0.225 mmol of catalyst tri(dibenzylideneacetone)palladium and 0.225 mmol of tri-tert-butylphosphine were added. The mixture was refluxed at 120 ° C for 24 h under nitrogen protection, then cooled to 25 ° C, 150 mL of purified water was added, and the mixture was stirred for 30 min and allowed to stand for stratification. The mixture was separated and subjected to column chromatography to obtain the compound G001-4 (test value: 735.22, 14.44 g, yield 87%), with an HPLC purity of greater than 99%.

[0207]

[0208] Under nitrogen atmosphere, weigh G001-4 (11.29 mmol) solid and 11.29 mmol reactant 5 (CAS: 98-80-6), 33.87 mmol potassium carbonate were put into the reaction system, 250 ml toluene, 125 ml ethanol, 125 ml water, 1.13 mmol catalyst tetrakis(triphenylphosphine)palladium were added, refluxed at 90 ° C for 24 h under nitrogen protection, then cooled to 25 ° C, filtered, and solid column chromatography were performed to obtain the compound G001 shown (test value: 777.29, 7.23 g, yield 82.5%), and its HPLC purity was greater than 99%.

[0209] Example 2: Preparation of Compound G058

[0210]

[0211] Under nitrogen atmosphere, G001-2 (67.79 mmol) solid and 67.79 mmol reactant 2 (CAS: CAS: 73183-34-3) were weighed, 203.36 mmol potassium carbonate was put into the reaction system, [1,1'-bis(diphenylphosphino)ferrocene] dichloropalladium dichloromethane complex (14.7 g, 18 mmol) and potassium acetate (70.7 g, 720 mmol), 1,4-dioxane (500 mL) were added, and refluxed at 105 ° C for 24 h under nitrogen protection, then cooled to 25 ° C, filtered, and solid column chromatography was performed to obtain the compound G058-1 shown (test value: 360.18, 22.22 g, yield 88.4%), and its HPLC purity was greater than 99%.

[0212]

[0213] Under a nitrogen atmosphere, weigh G058-1 (67.79 mmol) solid and 67.79 mmol reactant 7 (CAS: 56961-77-4), 203.36 mmol potassium carbonate were put into the reaction system, and 125 ml toluene, 63 ml ethanol, 63 ml water, 3.39 mmol catalyst tetrakis(triphenylphosphine)palladium were added. Refluxed at 90 ° C for 24 h under nitrogen protection, then cooled to 25 ° C, filtered, and solid column chromatography was performed to obtain the compound G058-2 shown (test value: 379.05, 11.76 g, yield 45.8%), and its HPLC purity was greater than 99%.

[0214]

[0215] Under a nitrogen atmosphere, 22.58 mmol of G058-2, 22.58 mmol of G001-a, and 45.25 mmol of sodium tert-butoxide were weighed into the reaction system, and 150 ml of toluene, 0.225 mmol of catalyst tri(dibenzylideneacetone)palladium and 0.225 mmol of tri-tert-butylphosphine were added. The mixture was refluxed at 120 ° C for 24 h under nitrogen protection, then cooled to 25 ° C, 150 mL of purified water was added, and the mixture was stirred for 30 min and allowed to stand for stratification. The mixture was separated and subjected to column chromatography to obtain the compound G058-3 (test value: 659.19, 6.99 g, yield 47%), with an HPLC purity of greater than 99%.

[0216]

[0217] Under a nitrogen atmosphere, G058-3 (11.29 mmol) solid and 11.29 mmol reactant 8 (CAS: 73852-19-4) were weighed, and 33.87 mmol potassium carbonate was put into the reaction system. 250 ml toluene, 125 ml ethanol, 125 ml water, and 1.13 mmol catalyst tetrakis(triphenylphosphine)palladium were added. The mixture was refluxed at 90 ° C for 24 h under nitrogen protection, and then cooled to 25 ° C, filtered, and solid column chromatography was performed to obtain the compound G058 (test value: 913.27, 8.8 g, yield 85.4%) with an HPLC purity greater than 99%.

[0218] Example 3: Preparation of Compound H001

[0219] Under nitrogen atmosphere, weigh 271.14mmol of reactant 1 (CAS: 108-77-0), 813.43mmol of reactant 2 (CAS: 98-80-6), and 813.43mol of potassium carbonate into the reaction system, add 500ml of toluene, 250ml of ethanol, 250ml of water, and 13.56mmol of catalyst tetrakis(triphenylphosphine)palladium, reflux at 90°C for 24h under nitrogen protection, then cool to 25°C, filter, and solid column chromatography to obtain the compound H001 shown (test value: 309.37, 83.9g, yield 62.2%). Its HPLC purity is greater than 99%, and the synthetic route is as follows:

[0220]

[0221] The following compounds G and H were synthesized by referring to the synthesis method in the embodiment of the present invention, and their molecular formulas and mass spectra are shown in Table 1. The mass spectrometer model used in the mass spectrometry test in this application is Waters XEVO TQD, low precision, ESI source test.

[0222] Table 1

[0223] Example Compound Mass spectrometry Example 3 Compound G009 700.77 Example 4 Compound G010 700.77 Example 5 Compound G011 776.79 Example 6 Compound G012 852.83 Example 7 Compound G013 750.78 Example 8 Compound G014 750.78 Example 9 Compound G015 750.78 Example 10 Compound G016 750.78 Embodiment 11 Compound G037 750.78 Example 12 Compound G038 750.78 Example 13 Compound G039 750.78 Embodiment 14 Compound G040 750.78 Embodiment 15 Compound G041 750.78 Example 16 Compound G042 750.78 Embodiment 17 Compound G043 826.81 Embodiment 18 Compound G250 902.84 Embodiment 19 Compound H012 324.52 Embodiment 20 Compound H039 399.32 Embodiment 21 Compound H041 445.37 Embodiment 22 Compound H050 575.67 Embodiment 23 Compound H054 526.60 Embodiment 24 Compound H069 542.66 Embodiment 25 Compound H075 499.57 Embodiment 26 Compound H078 523.60 Embodiment 27 Compound H093 598.71 Embodiment 28 Compound H095 598.71 Embodiment 29 Compound H140 497.69 Embodiment 30 Compound H141 521.47 Embodiment 31 Compound H146 601.71 Embodiment 32 Compound H147 601.71 Embodiment 33 Compound H250 727.76 Embodiment 34 Compound H352 416.56

[0224] Application example: Preparation of organic electroluminescent devices

[0225] Device Example 1:

[0226] ITO anode: The coating thickness is The ITO (indium tin oxide) glass substrate was cleaned twice in distilled water, ultrasonically cleaned for 30 minutes, and then repeatedly cleaned twice with distilled water and ultrasonically cleaned for 10 minutes. After washing, it was ultrasonically cleaned with methanol, acetone, and isopropanol for 5 minutes in sequence, dried, and then transferred to a plasma cleaning machine for washing for 5 minutes to obtain an ITO anode.

[0227] HIL (hole injection layer): 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA) was vacuum-deposited on the ITO anode in a vapor deposition machine. A hole injection layer is formed.

[0228] HTL (hole transport layer): vacuum evaporation on the hole injection layer NPB (ie, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine) forms a hole transport layer.

[0229] Light-emitting layer: The light-emitting layer comprises the first host material G002 of the present invention, the second host material H012 of the present invention and a guest dopant. After the hole injection layer and the hole transport layer are formed, the light-emitting layer is formed on the hole transport layer.

[0230] The first host compound organic electroluminescent device and the second host compound organic electroluminescent device were introduced as hosts into two small chambers of a vacuum vapor deposition device respectively, and compound Z1 was introduced as a dopant into another small chamber; the two host materials were evaporated at a rate of 1:1, and the dopant materials were evaporated simultaneously at different rates, and a doping amount of 3wt% based on the total amount of the host and the dopant was deposited to form a light-emitting layer with a thickness of 40nm on the hole transport layer.

[0231] HBL (hole blocking layer): vacuum deposited on the light-emitting layer m bis(2-methyl-8-hydroxyquinoline-N1,O8)-(1,1'-biphenyl-4-hydroxy)aluminum (BAlq), forming a hole blocking layer.

[0232] ETL (Electron Transport Layer): Vacuum evaporation on the hole blocking layer 8-Hydroxyquinoline aluminum (Alq3), forming an electron transport layer.

[0233] EIL (Electron Injection Layer): Vacuum deposition on the electron transport layer LiF forms an electron injection layer.

[0234] Cathode: Evaporation on the electron injection layer Al is added to form a cathode to obtain an organic electroluminescent device.

[0235] Referring to the organic electroluminescent device and its preparation method provided in Device Application Example 1, the compounds of the present invention are selected to replace the first host compound organic electroluminescent device and the second host compound organic electroluminescent device for evaporation of the host material to prepare organic electroluminescent devices of the corresponding compounds.

[0236] The structure of the green light doping material Z1 is as follows:

[0237]

[0238] Device Example 2-18, Comparative Example 1-7 and Parallel Example 1-6:

[0239] The device manufacturing processes of device examples 2-18, comparative examples 1-7 and parallel examples 1-6 are exactly the same, and the same substrate materials and electrode materials are used. The film thickness of the electrode materials is also consistent. The difference is that the two main materials are different, and the corresponding first main compound and second main compound in Table 1 are selected respectively. The specific parameters are shown in Table 2.

[0240] Table 2

[0241]

[0242]

[0243] The comparative example structure is shown in Table 3 below:

[0244] Table 3

[0245]

[0246]

[0247] Performance testing: The driving voltage, luminous efficiency and life of the organic electroluminescent devices obtained in the above-mentioned comparative examples 1-7, parallel examples 1-6 and device examples 1-18 were characterized at a brightness of 15000 (nits). The test results are shown in Table 4 below.

[0248] Table 4

[0249]

[0250]

[0251] It can be seen from Table 4 that the driving voltage of the organic electroluminescent device provided by device example 1-18 of the present invention and parallel example 1-6 is 3.28V~4.42V, which is significantly lower than the driving voltage of comparative example 1-7. At the same time, the luminous efficiency is higher than that of comparative example 1-7, and the lifespan is significantly improved compared with that of comparative example 1-7.

[0252] It can be seen that the organic electroluminescent device prepared using the organic electroluminescent compound provided by the present invention as the light-emitting layer material has a significantly lower driving voltage, and the luminous efficiency and life are significantly improved compared with the organic electroluminescent device prepared using the comparison compounds E-1, E-2, E-3, F-1, F-2, and F-3 as the light-emitting layer dual-host material.

[0253] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A main material, characterized in that: The main material has a structure as shown in Formula 1: Wherein, R1 and R2 are the same or different from each other and are independently selected from substituted or unsubstituted C6-C30 aryl groups and C3-C30 heteroaryl groups; the heteroatom in the heteroaryl group is selected from O, N or S; R3 is selected from substituted or unsubstituted C6-C40 aryl, substituted or unsubstituted C3-C40 heteroaryl; the heteroatom in the heteroaryl is selected from O, N or S.

2. The main body material according to claim 1, characterized in that R1 and R2 are the same or different from each other and are independently selected from substituted or unsubstituted phenyl, biphenyl, terphenyl, naphthyl, dibenzofuranyl, dibenzothiophenyl, dibenzofluorenyl, carbazolyl, and pyridyl; R3 represents mono-, di-, tri- or tetra-substitution and is selected from substituted or unsubstituted phenyl, biphenyl, terphenyl, naphthyl, dibenzofuranyl, dibenzothiophenyl, dibenzofluorenyl, carbazolyl, pyridyl, phenanthryl and triphenylenyl.

3. The main body material according to claim 1 or 2, characterized in that: The substituent of the "substituted" group is selected from one or a combination of at least two of deuterium, fluorine, trifluoromethyl, cyano, C1-C10 alkyl, C1-C10 alkoxy, C3-C10 cycloalkyl or C6-C12 aryl, C6-C20 heteroaryl, wherein the heteroatom in the heteroaryl is selected from O, N or S; The hydrogen atoms are all unsubstituted by deuterium, all substituted by deuterium, or partly substituted by deuterium.

4. The main body material according to claim 1, characterized in that The main material has the following structure, but is not limited thereto:

5. A dual-host organic electroluminescent material, characterized in that: The dual-host organic electroluminescent material comprises a first host material and a second host material, and the mass ratio of the first host material to the second host material is 1:1; the first host material is the host material as claimed in claim 1, and the second host material has a structure shown in Formula 2: wherein D1, D2 and D3 are each independently selected from substituted or unsubstituted C6-C42 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C9-C60 fused aryl, substituted or unsubstituted C9-C60 fused heteroaryl, and the heteroatom is selected from O, S, and N; L1 and L2 are each independently selected from a linking bond, a substituted or unsubstituted C6-C30 aryl group.

6. The dual-host organic electroluminescent material according to claim 5, characterized in that: D1 and D2 are each independently selected from substituted or unsubstituted C6-C18 aryl groups; D3 is selected from substituted or unsubstituted C6-C36 aryl groups, substituted or unsubstituted C3-C30 heteroaryl groups; L1 and L2 are each independently selected from connecting bonds, substituted or unsubstituted C6-C18 aryl groups.

7. The dual-host organic electroluminescent material according to claim 6, characterized in that: D1 is selected from substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl or substituted or unsubstituted terphenyl, D2 is selected from substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl or substituted or unsubstituted triphenylene, D3 is selected from substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C9-C30 fused aryl, substituted or unsubstituted C9-C30 fused heteroaryl; L1 is a connecting bond, L2 is a connecting bond, phenyl or naphthyl.

8. The dual-host organic electroluminescent material according to any one of claims 5 to 7, characterized in that: The heteroaryl group is a monocyclic aromatic group or a polycyclic aromatic group including at least one heteroatom, and the heteroatom includes but is not limited to O, S, and N. Furthermore, the substituent in the substituted group is selected from deuterium, fluorine, C1-C10 alkyl, deuterium-substituted C1-C10 alkyl, C3-C10 cycloalkyl, three-membered to ten-membered heterocycloalkyl, and the heteroatom in the heterocycloalkyl is selected from O, S, and N; or any one or a combination of at least two of the following groups: The dashed lines represent the attachment sites of the groups; The hydrogen atoms are all unsubstituted by deuterium, all substituted by deuterium, or partly substituted by deuterium.

9. The dual-host organic electroluminescent material according to claim 5, characterized in that: The second main material is selected from any one of the following structures, but is not limited thereto:

10. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises the host material according to claim 1 or the dual-host organic electroluminescent material according to claim 5 .

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