Host material, organic electroluminescent material containing double hosts and organic electroluminescent device

Abstract

The invention provides a host material, an organic electroluminescent material containing double hosts and an organic electroluminescent device.The structural general formula of the host material is shown in the formula (1). The organic electroluminescent material containing double hosts comprises a first host material and a second host material, the first main body material is a main body material with a structural general formula as shown in a formula (1), the second main body material is a main body material with a structural general formula as shown in a formula (2), triplet excitons are dispersed on two main bodies by using the double-main-body material, triplet-triplet annihilation (TTA) is reduced, the driving voltage of the organic electroluminescent device is reduced, and the driving efficiency of the organic electroluminescent device is improved. And the luminous efficiency and the service life of the device can be improved.

Description

Technical Field

[0001] The present invention belongs to the field of organic electroluminescent materials, and particularly relates to a host material, an organic electroluminescent material containing a double host, and an organic electroluminescent device. Background Art

[0002] Organic electroluminescent devices (OLEDs) can be used to manufacture new display products and new lighting products. The market application prospect is very broad. At present, OLED display technology has been applied to fields such as smart phones and tablet computers. However, compared with the actual product application requirements, the performance of OLEDs such as luminous efficiency and service life still needs to be further improved.

[0003] The OLED structure includes electrode material layers and organic functional materials sandwiched between different electrode layers. As a current device, when a voltage is applied to the two electrodes of the OLED, positive and negative charges in the organic layer functional material layers are separated by the action of an 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 the contribution to electroluminescence is very small, by doping organic metal complexes such as platinum, iridium, and osmium, the triplet excitons of organic molecules can be transferred to the triplet state of the metal complex, thereby improving the efficiency of the organic light-emitting device. Therefore, the efficiency of OLEDs can be improved by doping the host and guest in the light-emitting layer. However, triplet-triplet annihilation (TTA) occurs during the transfer process of triplet excitons, resulting in energy loss and causing efficiency roll-off of the organic light-emitting device.

[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 too high driving voltage, too low luminous efficiency, or short service life, which all affect the application fields of organic electroluminescent devices.

[0005] Therefore, how to provide an organic electroluminescent material containing a double host with a long service life and a low driving voltage, its preparation method, and an organic electroluminescent device are technical problems that need to be urgently solved by those skilled in the art. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a host material, an organic electroluminescent material containing a double host, and an organic electroluminescent device.

[0007] To achieve the purpose of this invention, the following technical solutions are adopted in the present invention:

[0008] On the one hand, the present invention provides a host material, and the structural general formula of the host material is shown in formula (1):

[0009]

[0010] Among them, L is independently selected from unsubstituted C6-C12 aryl; R 1 , R 2 and R 3 are independently selected from one of substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C1-C10 alkoxy, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C3-C30 heterocyclic group;

[0011] Among them, the "substituted" group is selected from one of hydrogen, deuterium, fluorine, C1-C10 alkyl, C1-C10 alkoxy, C3-C10 cycloalkyl, and C6-C12 aryl.

[0012] In the present invention, the C6-C12 aryl may be aryl of C6, C7, C8, C9, C10, C11 or C12, the C1-C10 alkyl may be alkyl of C1, C2, C3, C4, C5, C6, C7, C8, C9 or C10, the C1-C10 alkoxy may be alkoxy of C1, C2, C3, C4, C5, C6, C7, C8, C9 or C10, the C6-C30 aryl may be aryl of C6, C7, C8, C9, C10, C12, C14, C16, C18, C20, C22, C25, C28 or C30, the C3-C30 heterocyclic group may be heterocyclic group of C3, C4, C5, C6, C7, C8, C9, C10, C12, C14, C16, C18, C20, C22, C25, C28 or C30, and the C3-C10 cycloalkyl may be cycloalkyl of C3, C4, C5, C6, C7, C8, C9 or C10.

[0013] Preferably, the host material is any one of the following structures, but not limited thereto:

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034] The above are some specific structural forms of the host material, but not limited to the listed chemical structures. All compounds with simple transformations of groups within the defined ranges based on the structural general formula shown in Formula (1) should be included.

[0035] The second technical object of the present invention is to provide an organic electroluminescent material containing a double host. The organic electroluminescent material containing a double host includes a first host material and a second host material. The first host material is the host material as described above, and the mass ratio of the first host material to the second host material is 1:1;

[0036] The structural general formula of the second host material is shown in Formula (2):

[0037]

[0038] Among them, D 1 , D 2 , D 3 are each independently selected from substituted or unsubstituted C6-C42 aryl groups, substituted or unsubstituted C3-C30 heteroaryl groups; L 1 , L 2 are a linking bond, a substituted or unsubstituted C6-C30 aryl group.

[0039] Preferably, D 1 , D 2 are selected from C6-C18 substituted or unsubstituted aryl groups; D3 Selected from substituted or unsubstituted C6-C36 aryl, substituted or unsubstituted C3-C30 heteroaryl; L 1 、L 2 Selected from a linking bond, C6-C18 substituted or unsubstituted aryl.

[0040] Preferably, D 1 Selected from substituted or unsubstituted phenyl, biphenyl, terphenyl; D 2 Selected from substituted or unsubstituted phenyl, naphthyl, biphenyl, terphenyl, benzophenanthryl; D 3 Selected from substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl; L 1 Is a linking bond, L 2 Is a linking bond or phenyl, naphthyl.

[0041] In the present invention, the heteroaryl includes a monocyclic aromatic group and a polycyclic aromatic system containing at least one heteroatom, and the heteroatoms include but are not limited to O, S, N.

[0042] In the second host material, the substituents in the substituted groups are selected from deuterium, fluorine, C1-C10 alkyl, deuterium-substituted C1-C10 alkyl, C3-C10 cycloalkyl, three- to ten-membered heterocycloalkyl, and the heteroatoms are selected from O, S, N; or any one or a combination of at least two of the following substituents: , the dotted line represents the bonding site of the group.

[0044] 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. The substitution means that the hydrogen atom bonded to the carbon atom of the compound becomes another substituent, and the substitution position is not limited as long as it 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 or different from each other.

[0045] In the above technical solution, the second host material is any one of the following structures, but not limited thereto:

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

[0055]

[0056]

[0057] The above are some specific structural forms of the second main material, but are not limited to the listed chemical structures. All structural formulas are as shown in formula (2) as the basis, D 1 , D 2 , L 1 and L 2 Compounds in which the groups are simple permutations of all the groups within the previously defined ranges are intended to be included.

[0058] 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:

[0059] 1. Synthesis of the first main material:

[0060] (1) Under nitrogen atmosphere, weigh 1 eq of R 3 Substituent reactant 1, 1-1.2eq containing R 2 The substituent reactant 2 and 2-3 eq sodium tert-butoxide are added to the reaction flask in sequence, and then toluene, 0.02-0.03 eq tris(dibenzylideneacetone)palladium and 0.04-0.06 eq tri-tert-butylphosphine are added. Under nitrogen protection, reflux at 100-120°C for 12-36 h, cool to 25°C, add purified water, stir for 30 min, let stand and separate the layers, separate the liquids, use dichloromethane / petroleum ether as eluent, and perform column chromatography to obtain R-1.

[0061] (2) Under nitrogen atmosphere, weigh 1 eq of compound R-1, 1-1.2 eq of reactant 3 containing an L substituent, and 2-3 eq of sodium tert-butoxide, and then add toluene, 0.02-0.03 eq of tris(dibenzylideneacetone)palladium, and 0.04-0.06 eq of tri-tert-butylphosphine. Under nitrogen protection, reflux at 100-120° C. for 12-36 h, cool to 25° C., add purified water, stir for 30 min, let stand and separate the layers, separate the layers, and use dichloromethane / petroleum ether as eluent for column chromatography to obtain R-2.

[0062] (3) Under nitrogen atmosphere, weigh 1 eq of R 1The substituent reactant 4, 1-1.2eq compound R-2, and 2-3eq sodium tert-butoxide are added to the reaction flask in sequence, and then toluene, 0.02-0.04eq tris(dibenzylideneacetone)palladium and 0.04-0.06eq tri-tert-butylphosphine are added. Under nitrogen protection, reflux at 100-120°C for 24-48h, cool to 25°C, add purified water, stir for 30min, let stand and separate the layers, separate the liquids, use dichloromethane / petroleum ether as eluent, and perform column chromatography to obtain R-3.

[0063] (4) Under nitrogen atmosphere, weigh 1 eq of reactant A, 1-1.2 eq of compound R-3, and 2-3 eq of sodium tert-butoxide and add them to the reaction bottle in sequence, then add toluene, 0.02-0.03 eq of tris(dibenzylideneacetone)palladium and 0.04-0.06 eq of tri-tert-butylphosphine, and heat at 100-120° C. under nitrogen protection.

[0064] Reflux for 12-36 hours, cool to 25°C, add purified water, stir for 30 minutes, let stand to separate the layers, separate the layers, and perform column chromatography using dichloromethane / petroleum ether as eluent to obtain Formula 1.

[0065] Its synthetic route is as follows:

[0066]

[0067] 2. Synthesis of the Second Main Material

[0068] (1) Under nitrogen atmosphere, weigh 1 eq of reactant 1, 1-1.2 eq of D 1 The reactants of the substituents 2 and 3-4 eq potassium carbonate were added to the reaction system in sequence, and then toluene, ethanol, water (2:1:1) and 0.05-0.08 eq tetrakis(triphenylphosphine)palladium were added, refluxed at 90°C for 24 h under nitrogen protection, cooled to 25°C, filtered, and solid column chromatography was performed to obtain compound H-1;

[0069] (2) Under nitrogen atmosphere, weigh 1 eq H-1, 1-1.2 eq containing D 2 The reactants 2-1 and 3-4 eq potassium carbonate of the substituent are added to the reaction system in sequence, and toluene, ethanol, water (2:1:1) and 0.05-0.08 eq tetrakis(triphenylphosphine)palladium are added, and the mixture is refluxed at 90-100°C for 24 h under nitrogen protection, cooled to 25°C, filtered, and subjected to solid column chromatography to obtain compound H-2;

[0070] (3) Under nitrogen atmosphere, weigh 1 eq H-2, 1-1.2 eq D 3The reactant 2-2 of the substituent and 3-4eq of potassium carbonate were successively added to the reaction system. Toluene, ethanol, water (2:1:1) and 0.05-0.08eq of tetrakis(triphenylphosphine)palladium were added. The mixture was refluxed at 90-100 °C for 24 h under nitrogen protection, cooled to 25 °C, filtered by suction, and the solid was separated by column chromatography to obtain Formula 2.

[0071] The synthetic route is as follows:

[0072]

[0073] The third technical object of the present invention is to provide an organic electroluminescent device, which includes a first electrode, an organic electroluminescent material layer, and a second electrode; the organic electroluminescent material layer includes a light-emitting layer, and the light-emitting layer includes a doping material and the organic electroluminescent material containing a double host as described above.

[0074] Preferably, the mass ratio of the organic electroluminescent material containing a double host to the doping material is (1-99):(99-1), such as 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.

[0075] Preferably, the organic electroluminescent material layer further includes at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, or an electron injection layer.

[0076] In the present invention, the organic electroluminescent device includes an anode, a hole transport region, a light-emitting layer, an electron transport region, and a cathode. Specifically, the anode material preferably has a material with a large work function to enable holes to be smoothly injected into the organic material layer. The anode materials include: metals, such as vanadium, chromium, copper, zinc, and gold, or their 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 SnO 2 :Sb; conductive polymers, such as poly(3-methylthiophene), poly[3,4-(ethylene-1,2-dioxy)thiophene] (PEDOT), polypyrrole, and polyaniline, but not limited thereto.

[0077] The cathode material preferably has a material with a small work function to enable smooth injection of electrons 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, or their alloys; multi-layer structure materials such as LiF / Al or LiO 2 / Al; but not limited thereto.

[0078] 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.

[0079] Among them, the hole injection layer material is a material that receives holes from the anode at a low voltage. 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 materials include metal porphyrins, oligothiophenes, arylamine-based organic materials, hexanitrile hexaazatriphenylene-based organic materials, quinacridone-based organic materials, perylene-based organic materials, anthraquinone, and conductive polymers based on polyaniline and polythiophene.

[0080] The hole transport layer material is a material that can receive holes from the anode or the hole injection layer, transport the holes to the light-emitting layer, and has a high hole mobility. The hole transport layer materials include arylamine-based organic materials, conductive polymers, block copolymers having both a conjugated part and a non-conjugated part, but not limited thereto.

[0081] The electron blocking layer is disposed between the hole transport layer and the light-emitting layer, and the electron blocking layer material includes arylamine-based organic materials.

[0082] The hole blocking layer is disposed between the hole transport layer and the light-emitting layer, and the hole blocking layer material includes triazine-based compounds.

[0083] The electron transport region includes an electron transport layer and an electron injection layer.

[0084] The electron transport layer has the function of promoting electron transport. The electron transport material is a material that receives electrons from the cathode and transports the electrons to the light-emitting layer and has a high electron mobility. The electron transport materials include Al complexes of 8-hydroxyquinoline, complexes of Alq 3 of complexes, organic radical compounds, hydroxyflavone-metal complexes, but not limited thereto. The thickness of the electron transport layer is 1 nm to 50 nm, which can prevent the degradation of electron transport characteristics and prevent the increase of driving voltage.

[0085] The electron injection layer has the function of promoting electron injection. The electron injection material is a material with the ability to transport electrons, excellent electron injection effect on the light-emitting layer or light-emitting material, preventing excitons generated in the light-emitting layer from migrating to the hole injection layer, and excellent thin-film forming ability. The electron injection layer materials include fluorenone, anthraquinodimethane, biphenylquinone, thiopyran dioxide, oxazole, dioxazole, triazole, imidazole, perylene tetracarboxylic acid, fluoreneylidene methane, anthrone, etc. and their derivatives, metal complexes, nitrogen-containing five-membered ring derivatives, but not limited thereto.

[0086] In the present invention, the organic electroluminescent device can be a top-emitting type, a bottom-emitting type or a double-sided emitting type.

[0087] The organic electroluminescent device can be used in organic solar cells, electronic papers, organic photoreceptors or organic thin-film transistors.

[0088] Compared with the prior art, the present invention has the following beneficial effects:

[0089] In the host material disclosed in the present invention, the bis(triarylamine) compound at the 2-position of the furan ring has stronger steric structure, smaller conjugated area, higher T1 energy level and faster mobility; so that the prepared device has a low driving voltage, a long lifespan and a high luminous efficiency.

[0090] The present invention discloses a double-host organic electroluminescent material, including a host material (the first host material) and a second host material. By using this double-host material, triplet excitons can be dispersed on two hosts, and triplet-triplet annihilation (TTA) can be reduced. When applied to an organic electroluminescent device, the driving voltage can be effectively reduced, and at the same time, the luminous efficiency and service life of the device can be improved. Description of the Drawings

[0091] Figure 1 It is the nuclear magnetic resonance hydrogen spectrum of compound R001 in Example 1 of the present invention. Detailed Embodiments

[0092] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0093] In addition, it should be noted that the values given in the following embodiments are as accurate as possible. However, those skilled in the art understand that due to inevitable measurement errors and experimental operation problems, each number should be understood as an approximate number rather than an absolutely accurate value.

[0094] Example 1: Preparation of Compound R001

[0095] Under nitrogen atmosphere, weigh 1eq of A (CAS: 264315-48-4), 1eq of N,N,N-triphenyl-1,4-phenylenediamine (CAS: 19606-98-5), 2eq of sodium tert-butoxide and put them into the reaction system, add toluene, 0.03eq of catalyst tris(dibenzylideneacetone)palladium and 0.05eq of tri-tert-butylphosphine, reflux at 120°C for 24h under nitrogen protection, then cool to 25°C, add purified water, stir for 30min, stand for stratification, separate, column chromatography, and obtain the compound R001 (test value: 652.41, yield 56.7%). Its HPLC purity is greater than 99%, and the synthesis route is as follows:

[0096]

[0097] Example 2: Preparation of Compound H001

[0098] Under nitrogen atmosphere, weigh 1eq of reactant 1 (CAS: 108-77-0), 1.2eq of reactant 2 (CAS: 98-80-6), and 3eq of potassium carbonate into the reaction system, add toluene, ethanol, water (2:1:1), and 0.05eq 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 (test value: 309.37, yield 62.2%). Its HPLC purity is greater than 99%, and the synthetic route is as follows:

[0099]

[0100] The following compounds R 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.

[0101] Table 1

[0102] Example Compound Mass Spectrum Example Compound Mass Spectrum Example 3 Compound R010 768.45 Example 20 Compound H003 359.32 Example 4 Compound R011 758.44 Example 21 Compound H004 391.39 Example 5 Compound R012 729.41 Example 22 Compound H005 435.38 Example 6 Compound R016 778.45 Example 23 Compound H041 445.37 Example 7 Compound R121 776.42 Example 24 Compound H050 575.67 Example 8 Compound R135 818.49 Example 25 Compound H054 526.60 Example 9 Compound R156 940.46 Example 26 Compound H069 542.66 Example 10 Compound R157 908.51 Example 27 Compound H075 499.57 Example 11 Compound R214 768.48 Example 28 Compound H078 523.60 Example 12 Compound R216 792.41 Example 29 Compound H093 598.71 Example 13 Compound R255 956.49 Example 30 Compound H095 598.74 Example 14 Compound R256 900.53 Example 31 Compound H140 497.69 Example 15 Compound R268 914.32 Example 32 Compound H141 521.47 Example 16 Compound R273 707.54 Example 33 Compound H146 601.71 Example 17 Compound R274 752.45 Example 34 Compound H147 601.72 Example 18 Compound R285 823.51 Example 35 Compound H197 552.69 Example 19 Compound R292 828.50 Example 36 Compound H198 484.71 Example 20 Compound H002 385.38

[0103] Application example: Preparation of organic electroluminescent devices

[0104] Device Example 1:

[0105] 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.

[0106] HIL (Hole Injection Layer): In an evaporation apparatus, 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA) is vacuum-evaporated onto the ITO anode. To form the hole injection layer.

[0107] HTL (Hole Transport Layer): NPB (i.e., N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine) is vacuum-evaporated onto the hole injection layer. To form the hole transport layer.

[0108] Emission Layer: The emission layer includes a first host material R001, a second host material H001, and a guest dopant. After the hole injection layer and the hole transport layer are formed, the emission layer is formed on the hole transport layer.

[0109] The first host compound organic electroluminescent device and the second host compound organic electroluminescent device are respectively introduced into two chambers of a vacuum vapor deposition device as hosts, and the compound Z1 is introduced into another chamber as a dopant; the two host materials are evaporated at a rate of 1:1, and the dopant material is simultaneously evaporated at different rates, and deposited based on a doping amount of 3 wt% of the total amount of the host and the dopant to form an emission layer with a thickness of 40 nm on the hole transport layer.

[0110] HBL (Hole Blocking Layer): Bis(2-methyl-8-hydroxyquinoline-N1,O8)-(1,1'-biphenyl-4-olato)aluminum (BAlq) is vacuum-evaporated onto the emission layer. To form the hole blocking layer.

[0111] ETL (Electron Transport Layer): Aluminum tris(8-hydroxyquinoline) (Alq 3 ) is vacuum-evaporated onto the hole blocking layer to form the electron transport layer.

[0112] EIL (Electron Injection Layer): LiF is vacuum-evaporated onto the electron transport layer. To form the electron injection layer.

[0113] Cathode: Al is evaporated onto the electron injection layer. To form the cathode, and thus an organic electroluminescent device can be obtained.

[0114] Referring to the organic electroluminescent device and its preparation method provided in Application Example 1 of the reference device, the first host compound organic electroluminescent device and the second host compound organic electroluminescent device are respectively replaced with the compounds of the present invention for evaporation of the host materials to prepare the organic electroluminescent devices of the corresponding compounds.

[0115] Red Light Dopant Material (Z1)

[0116]

[0117] Device Examples 2 - 20, Comparative Examples 1 - 9, and Parallel Examples 1 - 10:

[0118] The device manufacturing processes of Device Examples 2 - 20, Comparative Examples 1 - 9, and Parallel Examples 1 - 10 are exactly the same, and the same substrate material and electrode material are used. The film thickness of the electrode material is also consistent. The difference lies in that: the two host materials are different, and the corresponding first host compound and second host compound in Table 1 are selected respectively. The specific parameters are shown in Table 2.

[0119] Table 2

[0120]

[0121]

[0122] The structures of the materials used in the comparative examples are shown in Table 3 below:

[0123] Table 3

[0124]

[0125]

[0126]

[0127] Performance detection: At a brightness of 5000 (nits), the driving voltage, luminous efficiency, and lifespan of the organic light - emitting devices obtained from the above - mentioned Comparative Examples 1 - 9, Parallel Examples 1 - 10, and Device Examples 1 - 20 were characterized. The test results are shown in Table 4 below.

[0128] Table 4

[0129]

[0130]

[0131] As can be seen from Table 4, when the bis - triarylamine compound is at the 3 - position of the furan ring, the structure tends to be planar, resulting in a lower T1 energy level and slower mobility; when the bis - triarylamine compound is at the 2 - position of the furan ring, the structure has stronger steric properties, a smaller conjugated area, a higher T1 energy level, and faster mobility. The driving voltage of the organic light - emitting devices provided by Device Examples 1 - 20 and Parallel Examples 1 - 10 of the present invention is significantly less than that of Comparative Examples 1 - 9, and both the luminous efficiency and lifespan are significantly improved compared to Comparative Examples 1 - 9.

[0132] The applicant declares that the present invention uses the above embodiments to illustrate the main materials of the present invention, the organic electroluminescent materials containing dual hosts, and the organic electroluminescent devices. However, the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of the raw materials selected for the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A main material, characterized in that: The general structural formula of the main material is shown in formula (1): Wherein, L is independently selected from unsubstituted C6-C12 aryl; R1, R2 and R3 are independently selected from one of substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C1-C10 alkoxy, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heterocyclic group; Wherein, the "substituted" group is selected from one of hydrogen, deuterium, fluorine, C1-C10 alkyl, C1-C10 alkoxy, C3-C10 cycloalkyl, and C6-C12 aryl.

2. The main body material according to claim 1, characterized in that The main material is any one of the following compounds:

3. An organic electroluminescent material containing a double host, characterized in that: The organic electroluminescent material containing two hosts comprises a first host material and a second host material, wherein the first host material is the host material as described above, and the mass ratio of the first host material to the second host material is 1:1; The general structural formula of the second host material is shown in formula (2): Wherein, D1, D2, and D3 are each independently selected from substituted or unsubstituted C6-C42 aryl groups, substituted or unsubstituted C3-C30 heteroaryl groups; L1 and L2 are connecting bonds, substituted or unsubstituted C6-C30 aryl groups. Preferably, D1 and D2 are selected from C6-C18 substituted or unsubstituted aryl; D3 is selected from substituted or unsubstituted C6-C36 aryl, substituted or unsubstituted C3-C30 heteroaryl; L1 and L2 are selected from a connecting bond, C6-C18 substituted or unsubstituted aryl.

4. The organic electroluminescent material containing a double host according to claim 3, characterized in that: D1 and D2 are selected from C6-C18 substituted or unsubstituted aryl groups; D3 is selected from substituted or unsubstituted C6-C36 aryl groups, substituted or unsubstituted C3-C30 heteroaryl groups; L1 and L2 are selected from connecting bonds, C6-C18 substituted or unsubstituted aryl groups.

5. The organic electroluminescent material containing a double host according to claim 3, characterized in that: D1 is selected from substituted or unsubstituted phenyl, biphenyl and terphenyl; D2 is selected from substituted or unsubstituted phenyl, naphthyl, biphenyl, terphenyl and triphenylene; D3 is selected from substituted or unsubstituted C6-C30 aryl and substituted or unsubstituted C3-C30 heteroaryl; L1 is a connecting bond, and L2 is a connecting bond or phenyl or naphthyl.

6. The organic electroluminescent material containing a double host according to any one of claims 3 to 5, characterized in that: The substituents in the substituted group are selected from deuterium, fluorine, C1-C10 alkyl, deuterium-substituted C1-C10 alkyl, C3-C10 cycloalkyl, three-membered to ten-membered heterocycloalkyl, and the heteroatoms are selected from O, S, N; or any one or a combination of at least two of the following substituents: Dashed lines represent the attachment sites of the groups.

7. The organic electroluminescent material containing a double host according to claim 3, characterized in that: The second main material is any one of the following structures, but is not limited thereto:

8. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises a first electrode, an organic electroluminescent material layer, and a second electrode; the organic electroluminescent material layer comprises a light-emitting layer, and the light-emitting layer comprises a doping material and the organic electroluminescent material containing a dual host as claimed in any one of claims 5 to 7.

9. The organic electroluminescent device according to claim 8, characterized in that: The mass ratio of the organic electroluminescent material containing the dual hosts to the doping material is (1-99):(99-1).

10. The organic electroluminescent device according to claim 8, characterized in that: The organic electroluminescent material layer further includes at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer or an electron injection layer.

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