A host material, an organic electroluminescent material containing two hosts, and an organic electroluminescent device.

Abstract

This invention provides a host material, an organic electroluminescent material containing two hosts, and an organic electroluminescent device. The host material has the structure shown in Formula 1. The organic electroluminescent material containing two hosts includes a first host material and a second host material. The first host material has at least one of the organic electroluminescent compounds shown in Formula 1, and the second host material has the structure shown in Formula 2. The organic electroluminescent material containing two hosts of this invention can reduce the driving voltage of the organic electroluminescent device, improve current efficiency, and extend the device lifespan.

Description

Technical Field

[0001] This invention belongs to the field of organic electroluminescent materials, specifically relating to a host material, an organic electroluminescent material containing two hosts, and an organic electroluminescent device. Background Technology

[0002] Organic electroluminescent devices are self-emissive devices that have attracted widespread attention in the panel display device industry due to their characteristics such as low driving voltage, high resolution, high brightness, fast response time, and flexibility, as well as the low production cost, easy processing, and high purity of raw materials.

[0003] Currently, OLED display technology has been applied in fields such as smartphones and tablets, and will be expanded to large-size applications such as televisions. However, compared with the requirements of actual product applications, the performance of OLED, such as luminous efficiency and lifespan, still needs to be further improved.

[0004] The luminescent material of an organic light-emitting diode (OLED) device is the most important factor determining the device's luminous efficiency. Functionally, it can be divided into host materials and dopant materials. The luminescent material can be used by mixing the host and dopants to improve color purity, luminous efficiency, and stability. Devices with excellent electroluminescence (EL) characteristics typically have a structure where a luminescent layer is formed by incorporating dopants into the host. When using such a dopant / host material system as the luminescent material, the host material significantly affects the efficiency and lifespan of the OLED device; therefore, selecting a suitable host material is crucial.

[0005] Therefore, the urgent task at present is to develop OLEDs with high efficiency and long lifespan. In particular, considering the EL characteristics required for medium and large OLED panels, it is imperative to develop luminescent materials that are superior to conventional luminescent materials and have excellent performance. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a host material, an organic electroluminescent material containing two hosts, and an organic electroluminescent device.

[0007] To achieve this objective, the present invention employs the following technical solution: On one hand, the present invention provides a main material, the structure of which is shown in general formula 1: ; Where X is selected from S or Se.

[0008] Wherein, R is selected from substituted or unsubstituted C6-C24 aryl, substituted or unsubstituted C6-C24 heteroaryl, substituted or unsubstituted oxophosphoryl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, and substituted or unsubstituted C4-C36 fused ring. Among them, the heteroaryl group includes a monocyclic aromatic group or a polycyclic aromatic system with at least one heteroatom, and the heteroatom includes, but is not limited to, O, S, and N; In Formula 1, the hydrogen atoms are either undeuterated, partially deuterated, or completely deuterated.

[0009] In this invention, The structure drawn with free bonds in the group indicates that phenyl groups can be fused at any fused position on the benzene ring.

[0010] Furthermore, R is selected from substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted anthrayl, substituted or unsubstituted pyrene, substituted or unsubstituted hydroxyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted benzothiophene, substituted or unsubstituted dibenzofuran, substituted or unsubstituted 9-phenyl-9H-carbazolyl, substituted or unsubstituted dibenzothiophene, substituted or unsubstituted dimethylfluorenyl, substituted or unsubstituted benzocarbazolyl. Substituted or unsubstituted naphthobenzofuranyl, substituted or unsubstituted naphthobenzothiophene, substituted or unsubstituted phenanthiazolyl, substituted or unsubstituted phenanthoxazolyl, substituted or unsubstituted benzodimethylfluorenyl, substituted or unsubstituted 9,9-spirodifluorenyl, substituted or unsubstituted 9,9-diphenylfluorenyl, substituted or unsubstituted naphthooxazolyl, substituted or unsubstituted benzooxazolyl, substituted or unsubstituted tetraphenylsilyl, substituted or unsubstituted triphenylphosphine, or any one of the following groups: in, Indicates connectable locations; This indicates that connections can be made at any available connection point.

[0011] The substituents in the above-mentioned "substitution" are selected from deuterium, fluorine, cyano, methyl, trifluoromethyl, tert-butyl, cyclohexyl, phenyl, naphthyl, phenanthryl, anthracene, dibenzofuranyl, 9-phenyl-9H-carbazolyl, dibenzothiophene, 9,9-dimethylfluorenyl, 9,9-diphenylfluorenyl, and 9,9-spirodifluorenyl.

[0012] In the above technical solution, the main material can be any one of the following structures, but is not limited to: .

[0013] The above are some specific structural forms of the main material, but are not limited to the chemical structures listed. All compounds with simple transformations of groups within the defined range based on the general structural formula shown in Formula 1 should be included.

[0014] A second objective of this invention is to provide an organic electroluminescent material comprising two main components, wherein the organic electroluminescent material comprises a first main component and a second main component, the mass ratio of the first main component to the second main component being 1:9-9:1; the first main component has at least one of the organic electroluminescent compounds shown in general formula 1, and the second main component has the structure shown in general formula 2. ; General Formula 2 L1 to L3 are each independently selected from the linking bond, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C6-C30 heteroaryl; Ar1 to Ar3 are each independently selected from substituted or unsubstituted C6-C30 aryl groups, substituted or unsubstituted C6-C30 heteroaryl groups, and substituted or unsubstituted C10-C30 fused-ring groups; wherein, the heteroaryl group is a monocyclic aromatic group or a polycyclic aromatic system that includes at least one heteroatom, and the heteroatom includes, but is not limited to, O, S, and N.

[0015] Further, Ar1 is selected from unsubstituted or substituted C6-C24 aryl groups or substituted or unsubstituted C3-C30 heteroaryl groups, wherein the heteroaryl group is a monocyclic aromatic group or a polycyclic aromatic system that includes at least one heteroatom, and the heteroatom includes, but is not limited to, O, S, and N. Ar2 and Ar3 are each independently selected from substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl; L2 and L3 are each independently selected from the connector key; L1 is selected from the linking bond, substituted or unsubstituted C6-C18 aryl, substituted or unsubstituted C6-C18 heteroaryl, wherein the heteroatom is selected from O, S, N; The substituents in the "substitution" are selected from deuterium, cyano, methyl, tert-butyl, C6-C24 aryl, and C6-C24 heteroaryl, wherein the heteroatom is selected from O, S, and N.

[0016] In this invention, the second body material has any one of the following structures, but is not limited thereto: .

[0017] The above are some specific structural forms of the second main material, but are not limited to the chemical structures listed. All compounds based on the general structural formula shown in Formula 2, where the Ar1, Ar2, Ar3, L1, L2, and L3 groups are simple variations of groups within the range defined above, should be included.

[0018] The present invention also provides a method for preparing the organic electroluminescent material containing two main bodies, the specific steps and conditions of which are as follows: I. Synthesis of the main materials: 1. Synthesis of the first main material (1) Under a nitrogen atmosphere, weigh 1 eq of reactant 1, 1-1.2 eq of reactant 2, and 2-3 eq of potassium carbonate and add them to the reaction flask in sequence. Then add toluene, ethanol, water, and 0.02-0.04 eq of tetra-triphenylphosphine palladium. Under nitrogen protection, reflux at 60-80℃ for 24-48h, cool to 25℃, add pure water, stir for 30min, let stand for layering, separate the layers, use dichloromethane / petroleum ether as eluent, and perform column chromatography to obtain intermediate 1-1. (2) Under a nitrogen atmosphere, weigh 1 eq of intermediate 1-1, 1-1.2 eq of reactant 3, and 2-3 eq of potassium carbonate and add them to the reaction flask in sequence. Then add tetrahydrofuran, water, and 0.02-0.04 eq of tetratriphenylphosphine palladium. Under nitrogen protection, reflux at 60-80℃ for 24-48h, cool to 25℃, add pure water, stir for 30min, let stand for separation, separate the layers, use dichloromethane / petroleum ether as eluent, and perform column chromatography to obtain intermediate 1-2. (3) Under a nitrogen atmosphere, 1 eq of intermediates 1-2, 1-1.2 eq of reactant 4, and 2-3 eq of potassium carbonate were weighed and added to the reaction flask in sequence. Then, tetrahydrofuran, water, and 0.02-0.04 eq of tetratriphenylphosphine palladium were added. Under nitrogen protection, the mixture was refluxed at 60-80℃ for 24-48 h, cooled to 25℃, and purified water was added. After stirring for 30 min, the mixture was allowed to stand for separation and the layers were separated. Using dichloromethane / petroleum ether as the eluent, column chromatography was performed to obtain general formula 1. The synthetic route is as follows: 2. Synthesis of the second main material (1) Weigh reactant 5 (1 eq), reactant 6 (1-1.2 eq), and sodium tert-butoxide (2-3 eq) and add them to the reaction vessel in sequence. Then add toluene as the reaction solvent. Under nitrogen protection, add catalysts Pd2(dba)3 (0.01-0.02 eq) and P(t-Bu)3 (0.02-0.04 eq). Reflux at 110-130℃ for 18-36 hours under nitrogen protection. Then cool to 25℃, add pure water, stir for 30 minutes, let stand for layering, separate the liquid and liquid, and perform column chromatography to obtain intermediate 2-1.

[0019] (2) The synthesis method of general formula 2 is the same as that of intermediate 2-1, and will not be described in detail here.

[0020] .

[0021] The third technical objective of this 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, which includes a doped material and an organic electroluminescent material containing a dual host.

[0022] Preferably, the mass ratio of the organic electroluminescent material containing two main bodies to the doped material is (1~99):(99~1), for example, 1:98, 1:97, 1:2, 1:9, 1:5, 1:4, 1:10, 1:20, 2:1, 3:5, 5:1, 15:1, 20:1, 20:9, 99:1, 80:1, 1:80, 1:99, 2:98, 3:97, 5:95, 8:92, etc. In this invention, the organic electroluminescent device includes an anode (first electrode), a hole transport region, a light-emitting layer, an electron transport region, and a cathode (second electrode). Specifically, The anode material is preferably a material with a high work function to facilitate the injection of holes into the organic material layer. The anode material includes: metals such as vanadium, chromium, copper, zinc and gold, or alloys thereof; 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-dioxo)thiophene] (PEDOT), polypyrrole and polyaniline, but is not limited thereto.

[0023] The cathode material is preferably a material with a small work function to facilitate the 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 alloys thereof; multilayer structure materials such as LiF / Al or LiO2 / Al; but is not limited thereto.

[0024] The hole transport region includes a hole injection layer, a hole transport layer, an electron blocking layer, and a hole blocking layer, with the light-emitting layer located between the electron blocking layer and the hole blocking layer.

[0025] The hole injection layer material is a material that receives holes from the anode under 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. Hole injection materials include metalloporphyrins, oligothiophenes, arylamine-based organic materials, hexanitrile hexaazabenzophenanthrene-based organic materials, quinacridone-based organic materials, perylene-based organic materials, anthraquinones, and conductive polymers based on polyaniline and polythiophene.

[0026] Hole transport layer materials are materials capable of receiving holes from the anode or hole injection layer and transporting them to the light-emitting layer, and possessing high hole mobility. Hole transport layer materials include, but are not limited to, arylamine-based organic materials, conductive polymers, and block copolymers having both conjugated and non-conjugated portions.

[0027] An electron blocking layer is disposed between the hole transport layer and the light-emitting layer, and the electron blocking layer material includes an organic material based on arylamine.

[0028] A 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.

[0029] The electron transport region includes an electron transport layer and an electron injection layer.

[0030] The electron transport layer promotes electron transport. Electron transport materials are materials with high electron mobility that receive electrons from the cathode and transport them to the light-emitting layer. Electron transport materials include, but are not limited to, Al complexes of 8-hydroxyquinoline, Alq3 complexes, organic free radical compounds, and hydroxyflavonoid-metal complexes. The thickness of the electron transport layer ranges from 1 nm to 50 nm, preventing a decrease in electron transport properties and an increase in driving voltage.

[0031] The electron injection layer promotes electron injection. Electron injection materials are those capable of transporting electrons, exhibiting excellent electron injection effects on the luminescent layer or luminescent material, preventing excitons generated in the luminescent layer from migrating to the hole injection layer, and possessing excellent thin-film formation capabilities. Electron injection layer materials include fluorenones, anthraquinone dimethane, biphenylquinone, thiamethane dioxide, azoles, diazoles, triazoles, imidazoles, perylenetetracarboxylic acid, fluorenemethane, anthrones, and their derivatives, metal complexes, and nitrogen-containing five-membered ring derivatives, but are not limited to these.

[0032] In this invention, the organic electroluminescent device can be a top-emitting type, a bottom-emitting type, or a dual-sided emitting type.

[0033] The organic electroluminescent device can be used in organic solar cells, electronic paper, organic photoreceptors, or organic thin-film transistors.

[0034] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a triazine-based first host material, with a triazine linked to the 1-position of a triazine group and a nucleus linked to naphthobenzothiophene or selenophyll. Triazine possesses strong electron-withdrawing capabilities, which helps to regulate the LUMO energy level and improve electron transport performance. Simultaneously, the larger conjugated system at the 1-position of the triazine group allows for a wider delocalization range of π electrons in the entire triazine ring, enhancing the molecular conjugation system, promoting charge migration, and improving fluorescence quantum efficiency. It exhibits excellent stability. Combined with the naphthobenzothiophene structure, the S or Se heteroatoms are electron-rich, improving HOMO and enhancing hole transport. The combination of these three components results in high carrier mobility, thin film stability, high Tg, high Td, and improved device lifetime. It also enables bidirectional transport, simplifying the device structure and improving luminescence efficiency and stability. Simultaneously, a second host material with a triarylamine structure is added, which can simultaneously enhance both hole and electron transport capabilities. Therefore, when holes are injected into the p-type host and electrons are injected into the n-type host, the driving voltage is reduced while the lifetime is enhanced. Attached Figure Description

[0035] Figure 1 The image shows the hydrogen nuclear magnetic resonance spectrum of compound R209 provided in this embodiment of the invention. Detailed Implementation

[0036] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0037] It should be noted that the values ​​given in the following embodiments are as accurate as possible. However, those skilled in the art will understand that due to unavoidable measurement errors and experimental operation issues, each number should be understood as an approximation rather than an absolutely accurate value.

[0038] Example 1: Preparation of compound R109 (1) Under a nitrogen atmosphere, 1 eq of 2-trien-1-yl-4,4,5,5-tetramethyl-1,3,2-dioxabortiacyclopentane (CAS:2681303-14-8), 1 eq of 2,4-dichloro-6-(1-dibenzofuranyl)-1,3,5-triazine (CAS:2408705-92-8), and 2 eq of potassium carbonate were weighed and added to a reaction flask in sequence. Then, toluene, ethanol, water (volume ratio 2:1:1) and 0.02 eq of tetraphenylphosphine palladium were added. Under nitrogen protection, the mixture was refluxed at 90°C for 24 h, cooled to 25°C, purified water was added, and the mixture was stirred for 30 min. After standing and separating the layers, the mixture was separated into liquids and column chromatography was performed using dichloromethane / petroleum ether as eluent to obtain intermediate R109-1 (yield 73.4%). The synthetic route is as follows: Under a nitrogen atmosphere, 1 eq of R109-1, 1 eq of benzo[b]naphtho[2,3-d]thiophene-2-ylboronic acid (CAS:2035080-66-9), and 2 eq of potassium carbonate were weighed and added to the reaction flask in sequence. Then, tetrahydrofuran, water (volume ratio 3:1), and 0.02 eq of tetratriphenylphosphine palladium were added. Under nitrogen protection, the mixture was refluxed at 80°C for 24 h, cooled to 25°C, and purified water was added. After stirring for 30 min, the mixture was allowed to stand for separation. The layers were separated, and column chromatography was performed using dichloromethane / petroleum ether as the eluent to obtain product R109 with a yield of 83.5%.

[0039] The synthesis route is as follows: .

[0040] Characterization: HPLC: 99.91%; Test value (ESI, m / Z): [M+H] + 705.77; Elemental analysis results: C: 83.34; H: 3.85; N: 5.92; O: 2.26; S: ​​4.52; The proton NMR spectrum is as follows: Figure 1 As shown.

[0041] Example 2: Preparation of compound H010 N-(phenyl-d5)naphthyl-2-amine (1 eq), 9-chloro-2-phenylphenanthrene[3,4-d]oxazole (1 eq), and sodium tert-butoxide (2 eq) were weighed into a reaction flask. Toluene was added, and catalysts Pd2(dba)3 (0.01 eq) and P(t-Bu)3 (0.02 eq) were added under nitrogen protection. The mixture was refluxed at 120 °C for 24 hours under nitrogen protection, then cooled to 25 °C. Pure water was added, and the mixture was stirred for 30 min. After standing and separating the layers, the mixture was separated and subjected to column chromatography to obtain product H010 with a yield of 76.2%.

[0042] The synthesis route is as follows: .

[0043] Characterization: HPLC: 99.90%; Test value (ESI, m / Z): [M+H]+: 517.87; Elemental analysis results: C: 85.79; H: 5.68; N: 5.42; O: 3.11; The synthesis methods for other compounds are the same as those in the above examples, and will not be described in detail here.

[0044] Device Example 1-60, Comparative Example 1-16 and Parallel Example 1-8: The device fabrication processes of Device Examples 1-60, Comparative Examples 1-16, and Parallel Examples 1-8 are completely identical, and the same substrate and electrode materials are used. The film thickness of the electrode materials is also consistent. The difference lies in that the two main materials are different. The specific parameters of the formulation of the main materials are shown in Table 1. The structures of comparative compounds D1 to D8 are shown below: Fabrication of red organic light-emitting devices The fabrication method of organic electroluminescent devices is as follows: (1) The ITO (indium tin oxide) glass substrate with a thickness of 1500 angstroms was washed twice with distilled water, ultrasonically washed for 30 minutes, then washed twice with distilled water, ultrasonically washed for 10 minutes. After washing, it was ultrasonically washed sequentially with methanol, acetone and isopropanol (5 minutes each time), dried, and then transferred to a plasma cleaner for 5 minutes to obtain the ITO anode.

[0045] (2) In the vapor deposition machine, HIL is vacuum vapor deposited on the ITO anode surface obtained in step (1) with a thickness of 700 angstroms to obtain a hole injection layer; the structure of HIL is as follows: .

[0046] (3) Vacuum evaporation of HTL on the surface of the hole injection layer obtained in step (2), first evaporating HTL1 with a thickness of 50 angstroms and then evaporating HTL2 with a thickness of 700 angstroms on its surface to form a hole transport layer. The HTL structure is as follows: .

[0047] (4) A light-emitting layer material is deposited on the surface of the hole transport layer by evaporation using a multi-source co-evaporation method with a linear gradient co-evaporation thickness of 300 angstroms to obtain the light-emitting layer. The material of the light-emitting layer includes a dual-host organic electroluminescent material and a doped material. The mass ratio of the first host compound and the second host compound in the dual-host organic electroluminescent material is 6:4, and the mass ratio of the dual-host organic electroluminescent material to the doped material is 10:1. The dual-host organic electroluminescent materials are the host materials provided in Examples 1-60, Comparative Examples 1-16, and Parallel Examples 1-8, respectively. The structure of the doped material is as follows: .

[0048] (5) An HBL with a thickness of 100 angstroms is deposited on the surface of the light-emitting layer obtained in step (4) to form a hole blocking layer. The structure of the HBL is as follows: .

[0049] (6) Vacuum evaporation of ETL on the surface of the hole blocking layer obtained in step (5) with a thickness of 300 angstroms is performed to obtain the electron transport layer. The ETL structure is as follows: .

[0050] (7) Vacuum evaporation of EIL (Liq) with a thickness of 15 angstroms is performed on the surface of the electron transport layer obtained in step (6) to obtain the electron injection layer; the EIL structure is as follows: .

[0051] (8) A 1200 angstrom layer of Al is deposited on the surface of the electron injection layer obtained in step (7) to form a cathode, thereby obtaining the organic electroluminescent device.

[0052] The driving voltage, luminous efficiency, and time (lifetime; T95) of the organic electroluminescent device at a brightness of 3000 nits were tested. The test results are shown in Table 1.

[0053] Table 1 As can be seen from Comparative Examples 9-16, using a combination of the first and second host compounds as the main material of the light-emitting layer can significantly improve luminous efficiency and lifespan. Using only one of them will result in a significant decrease in the luminous efficiency of the device, a markedly shortened lifespan, and an increase in voltage. A comparison between Comparative Examples 1-8 and Comparative Examples 9-16 shows that the device made with the first host material of the present invention has significantly better performance than the host materials D1-D8 of the comparative examples.

[0054] A comparison of devices 1-60 with parallel examples 1-8 shows that the efficiency of parallel examples 1-8 is 36.6-41.6 cd / A, the driving voltage is 4.15-4.67 V, and the lifetime is 562-663 h. In contrast, the luminous efficiency of devices 1-60 of the present invention is 46.7-48.6 cd / A, which is significantly higher than that of parallel examples 1-8; the driving voltage is 3.58-3.75 V, which is significantly lower than that of parallel examples 1-8; and the lifetime is 772-805 h, which is much higher than that of parallel examples 1-8.

[0055] Therefore, it can be seen that triazine as the primary host material, with triazine linked to the 1-position and to the naphthobenzothiophene or selenophyll as the core, has a strong electron-withdrawing ability, which helps to regulate the LUMO energy level and improve electron transport performance. At the same time, the 1-position conjugation system of the 1-position is larger, and the substitution can make the π electron delocalization range of the entire 1-ring wider, enhance the molecular conjugation system, promote charge migration and improve fluorescence quantum efficiency, and has excellent stability. Combined with the naphthobenzothiophene structure, the S or Se heteroatoms are electron-rich, improving HOMO and enhancing hole transport. The combination of the three has high carrier mobility, thin film stability, high Tg, high Td, and improved device lifetime. It can also transport in both directions, simplify the device structure, and improve luminescence efficiency and stability. Simultaneously, the second host with a triarylamine structure can enhance both hole and electron transport capabilities. Therefore, when holes are injected into the p-type host and electrons are injected into the n-type host, the driving voltage is reduced while the lifetime is also enhanced. Compared with the structures of the comparative compounds D5, D6, and D7, the first host β-base 1-position structure has better thermal stability, better device performance, low voltage, high temperature, structural stability, strong performance, and good lifetime.

[0056] The applicant declares that the present invention is illustrated through the above embodiments to describe the main material, the organic electroluminescent material containing two main components, and the organic electroluminescent device of the present invention. 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 improvements to the present invention, equivalent substitutions of the raw materials used in 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. A main material, characterized in that, The structure of the main material is shown in general formula 1: ； Where X is selected from S or Se; R is selected from substituted or unsubstituted C6-C24 aryl, substituted or unsubstituted C6-C24 heteroaryl, substituted or unsubstituted oxophosphoryl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, and substituted or unsubstituted C4-C36 fused ring. Among them, the heteroaryl group includes a monocyclic aromatic group or a polycyclic aromatic system with at least one heteroatom, and the heteroatom includes, but is not limited to, O, S, and N; In Formula 1, the hydrogen atoms are either undeuterated, partially deuterated, or completely deuterated.

2. The main material according to claim 1, characterized in that, R is selected from substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted phenanthryl, substituted or unsubstituted anthrayl, substituted or unsubstituted pyrene, substituted or unsubstituted hydroxyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted benzothiophene, substituted or unsubstituted dibenzofuran, substituted or unsubstituted 9-phenyl-9H-carbazolyl, substituted or unsubstituted dibenzothiophene, substituted or unsubstituted dimethylfluorenyl, substituted or unsubstituted benzocarbazolyl. Substituted or unsubstituted naphthobenzofuranyl, substituted or unsubstituted naphthobenzothiophene, substituted or unsubstituted phenanthiazolyl, substituted or unsubstituted phenanthoxazolyl, substituted or unsubstituted benzodimethylfluorenyl, substituted or unsubstituted 9,9-spirodifluorenyl, substituted or unsubstituted 9,9-diphenylfluorenyl, substituted or unsubstituted naphthooxazolyl, substituted or unsubstituted benzooxazolyl, substituted or unsubstituted tetraphenylsilyl, substituted or unsubstituted triphenylphosphine, or any one of the following groups: ； in, Indicates connectable locations; This indicates that connections can be made at any available connection point.

3. The main material according to claim 1 or 2, characterized in that, The substituents in the "substitution" are selected from deuterium, fluorine, cyano, methyl, trifluoromethyl, tert-butyl, cyclohexyl, phenyl, naphthyl, phenanthryl, anthracene, dibenzofuranyl, 9-phenyl-9H-carbazolyl, dibenzothiophene, 9,9-dimethylfluorenyl, 9,9-diphenylfluorenyl, and 9,9-spirodifluorenyl.

4. The main material according to claim 1, characterized in that, The host material is any one of the compounds with the following structures: 。 5. An organic electroluminescent material containing two main components, characterized in that, The organic electroluminescent material containing two hosts comprises a first host material and a second host material, wherein the mass ratio of the first host material to the second host material is 1:9-9:1; the first host material is at least one of the organic electroluminescent compounds according to any one of claims 1-4, and the second host material has the structure shown in general formula 2: ； General Formula 2 L1 to L3 are each independently selected from the linking bond, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C6-C30 heteroaryl; Ar1 to Ar3 are each independently selected from substituted or unsubstituted C6-C30 aryl groups, substituted or unsubstituted C6-C30 heteroaryl groups, and substituted or unsubstituted C10-C30 fused-ring groups; wherein, the heteroaryl group is a monocyclic aromatic group or a polycyclic aromatic system that includes at least one heteroatom, and the heteroatom includes O, S, and N.

6. The organic electroluminescent material containing two main bodies according to claim 5, characterized in that, Ar1 is selected from unsubstituted or substituted C6-C24 aryl groups or substituted or unsubstituted C3-C30 heteroaryl groups, where the heteroaryl group is a monocyclic aromatic group or a polycyclic aromatic system that includes at least one heteroatom, and the heteroatom includes, but is not limited to, O, S, and N. Ar2 and Ar3 are each independently selected from substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl; L2 and L3 are each independently selected from the connector key; L1 is selected from the linking bond, substituted or unsubstituted C6-C18 aryl, substituted or unsubstituted C6-C18 heteroaryl, wherein the heteroatom is selected from O, S, N; The substituents in the "substitution" are selected from deuterium, cyano, methyl, tert-butyl, cyclohexane, C6-C24 aryl, and C6-C24 heteroaryl, wherein the heteroatom is selected from O, S, and N.

7. The organic electroluminescent material containing two main bodies according to claim 5, characterized in that, The second host material is any one of the compounds having the following structures: 。 8. An organic electroluminescent device, characterized in that, The organic electroluminescent device includes a first electrode, an organic electroluminescent material layer, and a second electrode; the organic electroluminescent material layer includes a light-emitting layer, which includes a doped material and the organic electroluminescent material containing a dual host as described in any one of claims 5-7.

9. The organic electroluminescent device according to claim 8, characterized in that, The mass ratio of the organic electroluminescent material containing two main bodies to the doped material is (1~99):(99~1).

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