A composition and organic electroluminescent device

Abstract

The present application provides a kind of composition and organic electroluminescence device.The composition includes at least one first compound and at least one second compound;The first compound has as shown in formula B structure, and the second compound is selected from the compound with as shown in formula I structure or the compound with as shown in formula II structure.In the present application, by selecting the first compound with specific structure and the second compound with specific structure, the composition with specific composition is obtained, and the organic electroluminescence device prepared by using the composition as the host material of light-emitting layer has excellent performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of organic electroluminescent materials, and particularly relates to a composition and an organic electroluminescent device. BACKGROUND

[0002] With the rapid development of science and technology and information technology, people have put forward new goals and requirements for the performance of information display systems, and display devices with high brightness, high resolution, wide viewing angle and low energy consumption have become research hotspots. Organic electroluminescent (OLED) display technology can meet the above-mentioned needs of people, and has other advantages such as wide working temperature and flexible display, so it has become a new favorite of the new generation of flat panel displays after CRT (Cathode Ray Tube) display, LCD (Liquid Crystal Display) and PDP (Plasma Display) panel displays. At present, organic electroluminescent (OLED) display technology has been applied in the fields of smart phones and tablet computers, and is expanding to large-size application fields such as televisions.

[0003] In the development process in the past 30 years, different designs of organic electroluminescent device structures, optimization of performance such as the service life and efficiency of organic electroluminescent devices, and various excellent OLED materials have attracted widespread attention and research. More types and higher performance materials need to be developed in this field to meet people's higher requirements for OLED devices. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a composition and an organic electroluminescent device. In the present application, a composition with a specific composition is obtained by using a first compound with a specific structure and a second compound with a specific structure in combination, and the composition is used as the host material of the light-emitting layer. The organic electroluminescent device prepared therefrom has excellent performance.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a composition, which comprises at least one first compound and at least one second compound.

[0007] The first compound has the structure shown in the following formula B:

[0008]

[0009] wherein Ar 21 , Ar 22 each is independently selected from any one or a combination of at least two of phenyl, bi-phenyl, tri-phenyl, tetra-phenyl or naphthyl;

[0010] Ar 23any one selected from a single bond, phenylene, naphthylene, bisphenylene, trisphenylene, or tetraphenylene;

[0011] the second compound is selected from a compound having a structure shown in the following formula I or a compound having a structure shown in the following formula II:

[0012]

[0013] wherein, in the compound shown in the formula I and the compound shown in the formula II, X is independently selected from C or Si;

[0014] a dashed line represents a single bond or is absent;

[0015] in the compound shown in the formula I and the compound shown in the formula II, Ar1 is independently selected from any one of C6-C40 arylene, C6-C30 heteroarylene;

[0016] in the compound shown in the formula I and the compound shown in the formula II, Ar2 is independently selected from any one selected from a single bond, C6-C40 arylene, C6-C30 heteroarylene;

[0017] in the compound shown in the formula I and the compound shown in the formula II, Ar3, Ar4, and Ar5 are independently selected from any one of H, C6-C40 aryl, C6-C30 heteroaryl;

[0018] the hydrogen atoms in the compound shown in the formula I and the compound shown in the formula II can be independently substituted by at least one of a deuterium atom (-D), -F, -CN, C6-C20 aryl, C1-C12 alkyl, or C1-C12 alkoxy.

[0019] the hydrogen atoms in the first compound can be independently substituted by a deuterium atom.

[0020] In the present application, by selecting the first compound having a specific structure and the second compound having a specific structure, a composition having a specific composition is obtained, and the composition is used as the host material of the light-emitting layer, and the organic electroluminescent device prepared has a lower driving voltage, a higher current efficiency, and a longer lifetime.

[0021] In the present application, C6-C40 can be C6, C8, C10, C12, C15, C18, C20, C24, C30, C36, or C40, etc.

[0022] C6-C30 can be C6, C8, C10, C12, C15, C18, C20, C24, or C30, etc.

[0023] C6-C20 can be C6, C8, C10, C12, C15, C18, or C20, etc.

[0024] C1-C12 can be C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11 or C12.

[0025] The following is a preferred technical solution of the present application, but not as a restriction on the technical solutions provided by the present application, through the following preferred technical solution, the purpose and beneficial effects of the present application can be better achieved and realized.

[0026] As a preferred technical solution of the present application, the first compound is selected from a compound represented by formula B-1 or a compound represented by formula B-2:

[0027]

[0028] wherein Ar 21 , Ar 22 each independently is selected from any one or a combination of at least two of phenyl, biphenyl, terphenyl, quaterphenyl or naphthyl;

[0029] The hydrogen atoms in the compound represented by formula B-1 and the compound represented by formula B-2 can each independently be substituted with a deuterium atom.

[0030] Preferably, in the first compound, the hydrogen atoms in Ar 21 , Ar 22 are each independently substituted with a deuterium atom.

[0031] Preferably, the first compound is selected from a compound represented by formula B-1-D or a compound represented by formula B-2-D:

[0032]

[0033] wherein Ar 21 , Ar 22 each independently is selected from any one or a combination of at least two of phenyl, biphenyl, terphenyl, quaterphenyl or naphthyl.

[0034] It should be noted that in the compound represented by formula B-1-D and the compound represented by formula B-2-D, (D)4 represents that the four hydrogen atoms on the corresponding benzene ring are each substituted with a deuterium atom, and by analogy, (D)3 represents that the three hydrogen atoms on the corresponding benzene ring are each substituted with a deuterium atom, and in the compound represented by formula B-1-D and the compound represented by formula B-2-D, Ar 21 , Ar 22 each does not contain a deuterium atom.

[0035] As a preferred technical solution of the present application, Ar 21 , Ar 22The sum of the number of central benzene rings is selected from an integer ≥ 4, for example, can be 4, 5, 6, 7, or 8, etc.

[0036] Preferably, the Ar 21 is phenyl, the Ar 22 is selected from any one of biphenyl, terphenyl, or quaterphenyl.

[0037] Preferably, the Ar 21 is biphenyl, the Ar 22 is selected from biphenyl or terphenyl.

[0038] As a preferred technical solution of the present application, the first compound is selected from any one of the following substituted or unsubstituted compounds:

[0039]

[0040]

[0041] The substitution means that the hydrogen atoms in the above-mentioned compounds can each be independently substituted by a deuterium atom.

[0042] Preferably, the first compound is selected from any one of the following substituted or unsubstituted compounds H-1 to H-28, H101 to H105, H-17o, H-17m, H-101 to H-106:

[0043]

[0044]

[0045]

[0046] The substitution means that the hydrogen atoms in the above-mentioned compounds can each be independently substituted by a deuterium atom.

[0047] Preferably, the first compound is selected from any one of the following compounds:

[0048]

[0049]

[0050] As a preferred technical solution of the present application, in the compound represented by formula I, the compound represented by formula II, the C6-C40 aryl group is each independently selected from any one or a combination of at least two of phenyl, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl, fluorenyl, benzofluorenyl, dibenzofluorenyl, naphthofluorenyl, pyrenyl, perylenyl, spirofluorenyl, triphenylenyl, fluoranthenyl, hydrobenzanthryl, indenofluorenyl, benzindenofluorenyl, dibenzindenofluorenyl, naphthofluorenyl, or benzonaphthofluorenyl.

[0051] Preferably, the C6-C40 arylene group is selected from any one or a combination of at least two of phenylene, bibiphenylene, terbiphenylene, naphthylene, anthrylene, phenanthrylene, fluorenylene, benzofluorenylene, dibenzofluorenylene, naphthofluorenylene, pyrenylene, pyrylenylene, spirofluorenylene, terphenylene, fluoranthrylene, hydrobenzanthrylene, indenofluorenylene, benzindenofluorenylene, dibenzindenofluorenylene, naphthofluorenylene, or benzonaphthofluorenylene.

[0052] As a preferred technical solution of the present application, the C6-C30 heteroaryl group is selected from any one or a combination of at least two of carbazolyl, dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, dinaphthofuranyl, dinaphthothiophenyl, or carbazolyl.

[0053] Preferably, the C6-C30 heteroarylene group is selected from any one or a combination of at least two of carbazolylene, dibenzofuranylene, dibenzothiophenylene, naphthobenzofuranylene, naphthobenzothiophenylene, dinaphthofuranylene, dinaphthothiophenylene, or carbazolylene.

[0054] As a preferred technical solution of the present application, the C6-C20 aryl group is selected from any one or a combination of at least two of phenyl, bibiphenyl, terbiphenyl, naphthyl, anthryl, phenanthryl, fluorenyl, terphenyl, or fluoranthryl.

[0055] Preferably, the C1-C12 alkyl group is selected from any one or a combination of at least two of methyl, ethyl, propyl, butyl, pentyl, or adamantyl.

[0056] Preferably, the C1-C12 alkoxy group is selected from any one or a combination of at least two of methoxy, ethoxy, propoxy, butoxy, or pentoxy.

[0057] As a preferred technical solution of the present application, in the compound of formula I and the compound of formula II, each of Ar1 is independently selected from phenylene.

[0058] Preferably, in the compound of formula I and the compound of formula II, each of Ar2 is independently selected from any one or a combination of at least two of a single bond, carbazolylene, phenylene, naphthylene, bibiphenylene, dibenzofuranylene, dibenzothiophenylene, or 9,9-dimethylfluorenylene.

[0059] Preferably, in the compound of formula I and the compound of formula II, each of Ar3, Ar4, and Ar5 is independently selected from any one or a combination of at least two of a hydrogen atom, carbazolyl, phenyl, dibenzofuranyl, dibenzothiophenyl, 9,9-dimethylfluorenyl, or naphthyl.

[0060] Preferably, the hydrogen atoms in the compound of formula I and the compound of formula II are each independently substituted with at least one of -D (deuterium atom), -F, -CN, phenyl, naphthyl, biphenyl, methyl, ethyl, propyl, tert-butyl, methoxy, ethoxy, propoxy or butoxy.

[0061] As a preferred technical solution of the present application, the second compound is selected from any one of the following substituted or unsubstituted compounds:

[0062]

[0063]

[0064]

[0065]

[0066]

[0067] The substitution means that the hydrogen atoms in the above-mentioned compounds are each independently substituted with a deuterium atom.

[0068] Preferably, the compound further comprises substituting the hydrogen atoms in the above-mentioned compounds with to , wherein * represents a connection site, and the same applies hereinafter.

[0069] The above-mentioned compounds are exemplified by substituting to , for example, substituting to in compound P1 to obtain compound PC1, substituting to in compound P3 to obtain compound PC3, and other compounds can be similarly understood.

[0070]

[0071] Preferably, the compound is selected from any one of the following compounds:

[0072]

[0073]

[0074] It should be noted that the preparation method of the first compound and the second compound in the present application is not specially limited and can be prepared by conventional preparation methods in the art.

[0075] In a second aspect, the present application provides an organic electroluminescent device, comprising an anode, a cathode and an organic thin film layer disposed between the anode and the cathode.

[0076] The material of the organic thin film layer comprises the composition as described in the first aspect.

[0077] Preferably, the organic thin film layer comprises a hole layer and a light-emitting layer.

[0078] The host material of the light-emitting layer comprises the composition as described in the first aspect.

[0079] As a preferred technical solution of the present application, the organic thin film layer comprises a hole layer and a light-emitting layer, the light-emitting layer comprises the compound as described in the first aspect, and the hole layer comprises an electron blocking layer, the material of the electron blocking layer comprises a compound having a structure as shown in the following formula A:

[0080]

[0081] wherein R 601 is selected from any one of a tert-butyl-substituted phenyl group, a methylcyclopentyl-substituted phenyl group, a methylcyclohexyl-substituted phenyl group, a methylcyclopentyl group, a methylcyclohexyl group or a tert-butyl group;

[0082] Ring A and ring B are each independently selected from a benzene ring or a naphthalene ring;

[0083] Ar 601 is selected from a phenyl group, a naphthyl group, a phenylene group or a naphthylene group;

[0084] m, n, p are each independently selected from 0 or 1;

[0085] The hydrogen atoms in the compound of formula A can each independently be replaced by a deuterium atom.

[0086] It should be noted that when m is 1 and n is 1, Ar 601 is selected from a phenylene group or a naphthylene group; when m is 0 and n is 1, Ar 601 is selected from a phenyl group or a naphthyl group.

[0087] Preferably, the compound of formula A is selected from any one of the following substituted or unsubstituted compounds:

[0088]

[0089]

[0090] The substitution means that the hydrogen atoms in the above-mentioned compounds can each independently be replaced by a deuterium atom.

[0091] Compared with the prior art, the present application has the following beneficial effects:

[0092] (1) In the present application, by selecting the use of a first compound with a specific structure and a second compound with a specific structure, a composition with a specific composition is obtained, and the composition is used as the host material of the light-emitting layer. The organic electroluminescent device prepared has a lower driving voltage, higher current efficiency and longer service life.

[0093] (2) The composition with a specific composition provided by the present application is used as the host material of the light-emitting layer, and the compound of formula A is used as the electron blocking layer material, which can further improve the performance of the organic electroluminescent device. DETAILED DESCRIPTION

[0094] In order to facilitate the understanding of the present application, the present application is illustrated by the following examples. It should be understood by those skilled in the art that the examples are only to help understand the present application, and should not be regarded as a specific limitation on the present application.

[0095] The specific structures of the compounds used in the following device examples and device comparative examples are as follows:

[0096]

[0097]

[0098] Device Example 1

[0099] The present device example provides an organic electroluminescent device, which selects the composition provided by the present application as the red light host material in the organic electroluminescent device, and the specific composition of the composition is shown in Table 1 below.

[0100] The structure of the organic electroluminescent device is: ITO / HT-1(20nm) / red light host material(35nm): RD-1[10%] / TPBI(10nm) / Alq3(15nm) / LiF(0.5nm) / Al(150nm). Wherein "RD-1[10%]" refers to the doping ratio of red light dye, i.e. the volume ratio of red light host material to RD-1 is 90:10.

[0101] The preparation process of the organic electroluminescent device is as follows:

[0102] (1) The glass plate coated with ITO transparent conductive layer is treated with ultrasonic in commercial cleaning agent, washed in deionized water, ultrasonic deoiled in acetone: ethanol mixed solvent, baked in a clean environment until the water is completely removed, washed with ultraviolet light and ozone, and the surface is bombarded with low-energy cation beam;

[0103] (2) The glass substrate with anode mentioned above is placed in a vacuum chamber, vacuumed to 1×10 -5 ~9×10 -4Pa, a hole transport layer HT-1 was vacuum evaporated on the anode layer film, the evaporation rate was 0.1 nm / s, and the evaporation film thickness was 20 nm;

[0104] (3) A red light host material and a dye RD-1 were vacuum evaporated on the hole transport layer as a light-emitting layer of the organic electroluminescent device, the evaporation rate was 0.1 nm / s, and the total evaporation film thickness was 35 nm; in this embodiment, the first compound H-1 and the second compound E-1 were heated in different evaporation sources respectively, the heating speed was controlled so that the volume ratio of the two evaporated on the substrate was 1:1, and the red light host material was used.

[0105] (4) An electron transport layer TPBI and Alq3 were vacuum evaporated on the light-emitting layer in sequence, the evaporation rate was 0.1 nm / s, and the evaporation film thickness was 10 nm and 15 nm, respectively;

[0106] (5) 0.5 nm of LiF and 150 nm of Al were vacuum evaporated on the electron transport layer as an electron injection layer and a cathode.

[0107] Device Examples 2-15

[0108] Device Examples 2-15 each provided an organic electroluminescent device, which differed from the device example 1 only in that the red light host material was different, and the specific selection of the red light host material was shown in Table 1, the volume ratio of the two components in the red light host evaporated on the substrate was 1:1, and the other preparation steps and conditions were the same as those of the device example 1.

[0109] Device Comparative Examples 1-10

[0110] Device Comparative Examples 1-10 each provided an organic electroluminescent device, which differed from the device example 1 only in that the first compound and / or the second compound in the red light host material was different, or the red light host was a single component, and the specific selection of the red light host material was shown in Table 1, if the red light host was two components, the volume ratio of the two components in the red light host evaporated on the substrate was 1:1. The other preparation steps and conditions were the same as those of the device example 1.

[0111] Performance test:

[0112] The OLED-1000 multi-channel accelerated aging life and light color performance analysis system produced by Hangzhou Yuanfang was used to test and measure the luminance, driving voltage, current efficiency, and life test LT90 of the prepared organic electroluminescent device. Among them, the life test LT90 refers to the time required for the luminance to reduce to 90% of the initial luminance under the condition that the current density at the initial luminance is unchanged (herein, 1000 cd / m 2 ), at room temperature (25-27℃). In the following table, the voltage, efficiency, and LT90 are relative values.

[0113] The test results are shown in Table 1 below.

[0114] Table 1

[0115]

[0116] Wherein, " / " means that the component is not included in the red light host.

[0117] From the content of Table 1, it can be seen that by selecting the first compound and the second compound for use together, a composition is obtained, and the organic electroluminescent device prepared by using the composition as the host material of the light-emitting layer has a lower driving voltage, a higher current efficiency and a longer service life.

[0118] From the data of device examples 1-3, it can be seen that by selecting the first compound containing deuterium atoms, and further selecting the first compound in which the hydrogen atoms on the carbazole group are replaced by deuterium atoms, and using the second compound together, the driving voltage of the organic electroluminescent device can be further reduced, and the current efficiency and service life of the organic electroluminescent device can be improved.

[0119] From the comparison of the relevant data of device example 1 and device comparative examples 1, 9-10, the comparison of the relevant data of device example 4 and device comparative example 2, and the comparison of the relevant data of device examples 8-14 and device comparative examples 3, 6-8, it can be seen that by using the first compound with a specific structure and the second compound with a specific structure together, a composition with a specific composition is obtained, and by using the composition as the host material of the light-emitting layer, the comprehensive performance of the organic electroluminescent device can be further improved, so that the organic electroluminescent device has a lower driving voltage, a higher current efficiency and a longer service life.

[0120] From device comparative examples 4-5, it can be seen that by using the first compound and the second compound together, and using the composition composed of the first compound and the second compound as the host material of the light-emitting layer, the organic electroluminescent device prepared has a lower driving voltage, a higher current efficiency and a longer service life.

[0121] Device example 16

[0122] The device example provides an organic electroluminescent device, and the composition provided by the application is selected as the red light host material in the organic electroluminescent device, and the specific composition of the composition is shown in Table 1 below.

[0123] The structure of the organic electroluminescent device is: ITO / HT-1(20 nm) / electron blocking layer(5 nm) / red light host material(35 nm): RD-1[10%] / TPBI(10 nm) / Alq3(15 nm) / LiF(0.5 nm) / Al(150 nm). Wherein "RD-1[10%]" refers to the doping ratio of red light dye, that is, the volume ratio of red light host material to RD-1 is 90:10.

[0124] The preparation process of the organic electroluminescent device is as follows:

[0125] (1) The glass plate coated with ITO transparent conductive layer is treated with ultrasonic in commercial cleaning agent, washed in deionized water, ultrasonic deoiled in acetone: ethanol mixed solvent, baked in a clean environment until the water is completely removed, cleaned with ultraviolet light and ozone, and the surface is bombarded with low-energy cation beam;

[0126] (2) The glass substrate with anode above is placed in a vacuum chamber, vacuumed to 1x10 -5 ~ 9x10 -4 Pa, and the hole transport layer HT-1 is vacuum deposited on the anode layer film, the deposition rate is 0.1 nm / s, and the film thickness is 20 nm;

[0127] (3) The EB-1 is vacuum deposited as an electron blocking layer on the hole transport layer, the deposition rate is 0.1 nm / s, and the film thickness is 5 nm;

[0128] (4) The red light host material and dye RD-1 are vacuum deposited on the electron blocking layer as the light emitting layer of the organic electroluminescent device, the deposition rate is 0.1 nm / s, and the total film thickness is 35 nm; In this embodiment, the first compound H-1 and the second compound E-1 are respectively placed in different evaporation sources for heating, the heating speed is controlled so that the volume ratio of the two deposited on the substrate is 1:1, as the red light host material.

[0129] (5) The electron transport layer TPBI and Alq3 are vacuum deposited in turn on the light emitting layer, the deposition rate is 0.1 nm / s, and the film thickness is 10 nm and 15 nm respectively;

[0130] (6) 0.5 nm of LiF and 150 nm of Al are vacuum deposited on the electron transport layer as the electron injection layer and cathode.

[0131] Device examples 17-19

[0132] Device Examples 17-19 provide an organic electroluminescent device, which is only different from Device Example 16 in that the electron blocking layer material and / or the light-emitting layer host material is different (see Table 2 below for details), and other preparation steps and conditions are the same as those of Device Example 16.

[0133] Performance tests:

[0134] The luminance, driving voltage, current efficiency, and lifetime test LT90 of the prepared organic electroluminescent device were measured using an OLED-1000 multi-channel accelerated aging lifetime and light color performance analysis system test produced by Hangzhou Yuanfang. Among them, the lifetime test LT90 refers to the time required for the luminance to reduce to 90% of the initial luminance at room temperature (25-27°C), while keeping the current density unchanged at the initial luminance (here, 1000 cd / m 2 ). In the following table, the voltage, efficiency, and LT90 are relative values.

[0135] The test results are shown in Table 2 below.

[0136] Table 2

[0137]

[0138] From the content of Table 2, it can be seen that by selecting an electron blocking layer material with a specific structure and using it in combination with the red light host material of the composition of the present application, an organic electroluminescent device with lower driving voltage, higher current efficiency, and longer lifetime is prepared.

[0139] The applicant declares that the above examples are used to illustrate the detailed process flow of the present application, but the present application is not limited to the above detailed process flow, i.e. it does not mean that the present application must rely on the above detailed process flow to be implemented. It should be understood by those skilled in the art that any improvement on the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific methods, etc. fall within the scope of protection and disclosure of the present application.

Claims

1. A composition characterized in that, The composition comprises at least one first compound and at least one second compound; The first compound has a structure shown in the following formula B: ； wherein Ar 21 , Ar 22 each independently is selected from any one or a combination of at least two of phenyl, bi-phenyl, tri-phenyl, tetra-phenyl, or naphthyl; Ar 23 is selected from a single bond or phenylene; The second compound is selected from a compound having a structure shown in the following formula I or a compound having a structure shown in the following formula II: ； In the compound shown in formula I, the compound shown in formula II, X is independently selected from C or Si; The dotted line represents a single bond or is absent; In the compound shown in formula I, the compound shown in formula II, Ar1 is independently selected from C6-C40 arylene; In the compound shown in formula I, the compound shown in formula II, Ar2 is independently selected from any one or a combination of at least two of a single bond, C6-C40 arylene, C6-C30 heteroarylene; In the compound shown in formula I, the compound shown in formula II, Ar3, Ar4, Ar5 are independently selected from any one or a combination of at least two of H, C6-C40 aryl, C6-C30 heteroaryl; In the compound shown in formula I, the compound shown in formula II, the hydrogen atoms can be independently substituted by at least one of deuterium atom, -F, -CN, C6-C20 aryl, C1-C12 alkyl or C1-C12 alkoxy; In the compound shown in formula I, the compound shown in formula II, the C6-C40 aryl is independently selected from any one or a combination of at least two of phenyl, bi-phenyl, tri-phenyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, benzofluorenyl, dibenzofluorenyl, naphthofluorenyl, pyrenyl, perylenyl, spirofluorenyl, triphenylenyl, fluoranthenyl, hydride benzanthracenyl, indenofluorenyl, benzindenofluorenyl, dibenzindenofluorenyl, naphthofluorenyl or benzonaphthofluorenyl; The C6-C40 arylene is selected from any one or a combination of at least two of phenylene, bi-phenylene, tri-phenylene, naphthylene, anthracenylene, phenanthrenylene, fluorenylene, benzofluorenylene, dibenzofluorenylene, naphthofluorenylene, pyrenylene, perylenylene, spirofluorenylene, triphenylenylene, fluoranthenylene, hydride benzanthracenylene, indenofluorenylene, benzindenofluorenylene, dibenzindenofluorenylene, naphthofluorenylene or benzonaphthofluorenylene; The C6-C30 heteroaryl is selected from any one or a combination of at least two of dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, dinaphthofuranyl, dinaphthothiophenyl or carbazolyl; The C6-C30 heteroaryl is selected from any one or a combination of at least two of dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, dinaphthofuranyl, dinaphthothiophenyl or carbazolyl; The C6-C20 aryl is selected from any one or a combination of at least two of phenyl, bi-phenyl, tri-phenyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, triphenylenyl or fluoranthenyl.

2. The composition of claim 1, wherein, The first compound is selected from a compound shown in the following formula B-1 or a compound shown in the following formula B-2: ； wherein Ar 21 , Ar 22 each independently is selected from any one or a combination of at least two of phenyl, bi-phenyl, tri-phenyl, tetra-phenyl, or naphthyl; In the compound shown in formula B-1, the compound shown in formula B-2, the hydrogen atoms can be independently substituted by deuterium atom.

3. The composition of claim 1, wherein, in the first compound, Ar 21 , Ar 22 each independently substituted with deuterium atoms.

4. The composition of claim 1, wherein, The first compound is selected from a compound shown in the following formula B-1-D or a compound shown in the following formula B-2-D: ； wherein Ar 21 , Ar 22 each independently is selected from any one or a combination of at least two of phenyl, bi-phenyl, tri-phenyl, tetra-phenyl, or naphthyl.

5. The composition of claim 1, wherein the sum of the number of phenyl rings in Ar 21 , Ar 22 the sum of the number of phenyl rings in Ar is an integer ≥ 4.

6. The composition of claim 1, wherein, Ar is selected from any one of phenyl, biphenyl, terphenyl or quaterphenyl. 21 Ar is selected from any one of phenyl, biphenyl, terphenyl or quaterphenyl. 22 Ar is selected from any one of phenyl, biphenyl, terphenyl or quaterphenyl.

7. The composition of claim 1, wherein, said Ar is a biphenyl group 21 is a biphenyl group, said Ar 22 is selected from a biphenyl group or a terphenyl group.

8. The composition of claim 1, wherein, The first compound is selected from any one of the following substituted or unsubstituted compounds: ； The substitution means that the hydrogen atoms in the above compounds can each independently be substituted with deuterium atoms.

9. The composition of claim 8, wherein, The first compound is selected from any one of the following substituted or unsubstituted compounds H-1~H-28, H-17o, H-17m, H-101~H-106: ； The substitution means that the hydrogen atoms in the above compounds can each independently be substituted with deuterium atoms.

10. The composition of claim 1, wherein, The C1-C12 alkyl group is selected from any one of the following or a combination of at least two of the following: methyl, ethyl, propyl, butyl, pentyl or adamantyl.

11. The composition of claim 1, wherein, The C1-C12 alkoxy group is selected from any one of the following or a combination of at least two of the following: methoxy, ethoxy, propoxy, butoxy or pentoxy.

12. The composition of claim 1, wherein, In the compound of formula I and the compound of formula II, Ar1 is each independently selected from phenylene.

13. The composition of claim 1, wherein, In the compound of formula I and the compound of formula II, Ar2 is each independently selected from any one of the following or a combination of at least two of the following: a single bond, a carbazolylene group, a phenylene group, a naphthylene group, a biphenylene group, a dibenzofuranylene group, a dibenzothiophenylene group or a 9,9-dimethylfluorenylene group.

14. The composition of claim 1, wherein, In the compound of formula I and the compound of formula II, Ar3, Ar4, Ar5 are each independently selected from any one of the following or a combination of at least two of the following: a hydrogen atom, a carbazolyl group, a phenyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a 9,9-dimethylfluorenyl group or a naphthyl group.

15. The composition of claim 1, wherein, The hydrogen atoms in the compound of formula I and the compound of formula II can each independently be substituted with at least one of the following: -D, -F, -CN, a phenyl group, a naphthyl group, a biphenyl group, a methyl group, an ethyl group, a propyl group, a tert-butyl group, a methoxy group, an ethoxy group, a propoxy group or a butoxy group.

16. The composition of claim 1, wherein, The second compound is selected from any one of the following substituted or unsubstituted compounds: ； The substitution means that the hydrogen atoms in the above compounds can each independently be substituted with deuterium atoms.

17. The composition of claim 16, wherein, The second compound also includes a compound in which is replaced with The * indicates the site of attachment.

18. An organic electroluminescent device, characterized by The organic electroluminescent device comprises an anode, a cathode and an organic thin film layer disposed between the anode and the cathode; The organic thin film layer comprises a hole layer and a light-emitting layer; The host material of the light-emitting layer comprises the composition according to any one of claims 1-17.

19. The organic electroluminescent device according to claim 18, characterized in that The hole layer comprises an electron blocking layer, and the material of the electron blocking layer comprises a compound having a structure shown in the following formula A: Formula A; wherein R 601 is selected from any one of tert-butyl-substituted phenyl, methylcyclopentyl-substituted phenyl, methylcyclohexyl-substituted phenyl; Ring A and ring B are each independently selected from a benzene ring; Ar 601 is selected from phenyl, naphthyl, phenylene or naphthylene; m is selected from 1; n, p are each independently selected from 0; The hydrogen atoms in the compound of formula A can each independently be replaced with deuterium atoms.

20. The organic electroluminescent device according to claim 19, characterized in that The compound of formula A is selected from any one of the following substituted or unsubstituted compounds: ； The substitution means that the hydrogen atoms in the above compounds can each independently be substituted with deuterium atoms.

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