Deuterated composition containing anthracene compound and organic electroluminescent device

Abstract

The invention provides a deuterated composition containing an anthracene compound and an organic electroluminescent device. The deuterated composition containing the anthracene compound comprises a first component and a second component, the first component comprises an anthracene compound as shown in a formula I, the second component comprises a compound A, and the compound A comprises a compound as shown in a formula A-1 or a compound as shown in a formula A-2. The deuterated composition containing the anthracene compound provided by the invention can be used as a main body material of a light-emitting layer of an OLED light-emitting device, so that the OLED light-emitting device has relatively low driving voltage, relatively high current efficiency and relatively long service life.

Description

Technical Field

[0001] This invention belongs to the field of organic electroluminescent materials technology, specifically relating to a deuterated composition containing anthracene compounds and an organic electroluminescent device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are devices fabricated by depositing one or more layers of organic material between two metal electrodes via spin coating or vacuum evaporation. A classic three-layer OLED comprises a hole transport layer, an emissive layer, and an electron transport layer. Holes generated by the anode combine with electrons generated by the cathode via the electron transport layer in the emissive layer to form excitons, which then emit light. OLEDs can be tuned to emit various desired light colors by changing the material of the emissive layer.

[0003] Organic electroluminescent devices, as a novel display technology, possess unique advantages such as self-illumination, wide viewing angle, low energy consumption, high efficiency, thinness, rich colors, fast response speed, wide applicable temperature range, low driving voltage, the ability to manufacture flexible, bendable, and transparent display panels, and environmental friendliness. They can be applied to flat panel displays and next-generation lighting, and can also be used as backlights for LCDs.

[0004] Since their invention in the late 1980s, organic light-emitting diodes (OLEDs) have been used in various industries, such as as screens in cameras and mobile phones. However, current OLED devices suffer from low efficiency and short lifespan, limiting their wider application, especially in large-screen displays. Therefore, it is necessary to improve the efficiency of these devices. One crucial factor limiting this is the performance of the organic light-emitting materials used in OLEDs. Thus, it is essential to develop stable and efficient organic light-emitting materials to improve the current efficiency and lifespan of OLED devices. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a deuterated composition containing anthracene compounds and an organic electroluminescent device. The deuterated anthracene compound composition provided by the present invention can be used as the main material of the light-emitting layer in an OLED light-emitting device, resulting in an OLED light-emitting device with lower driving voltage, higher current efficiency, and longer lifespan.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a deuterated composition containing anthracene compounds, the deuterated composition containing anthracene compounds comprising a first component and a second component;

[0008] The first component includes anthracene compounds having the structure shown in Formula I:

[0009] Formula I;

[0010] Ar1 is selected from any one of single bonds, phenylene, naphthylene, or biphenylene;

[0011] Ar2 is selected from any one of hydrogen atom, phenyl, naphthyl or biphenyl;

[0012] The hydrogen atoms in Ar1, Ar2, and the hydrogen atoms on the dibenzofuran ring in Formula I can each be independently replaced by deuterium atoms;

[0013] The second component includes compound A, which comprises a compound having the structure shown in Formula A-1 or a compound having the structure shown in Formula A-2.

[0014] ;

[0015] Among them, Ar 301 Ar 302 Each is independently selected from at least one of phenyl, naphthyl, or biphenyl;

[0016] In the compounds shown in Formula A-1 and Formula A-2, the hydrogen atoms can be independently replaced by deuterium atoms.

[0017] This invention designs the specific composition of the deuterated composition and prepares a high-performance deuterated composition by combining an anthracene compound (compound of formula I) having deuterated phenyl and deuterated anthracene groups and a second component. Using this deuterated composition as the main material of the light-emitting layer of an OLED light-emitting device can enable the OLED light-emitting device to have a lower driving voltage, higher current efficiency and longer lifespan.

[0018] In this invention, "D" represents a deuterium atom. Unless otherwise specified, "H" and "hydrogen" both represent "protium".

[0019] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0020] Preferably, the compound represented by Formula I includes a compound having the structure shown in Formula IA or a compound having the structure shown in Formula IB:

[0021] ;

[0022] Ar1 and Ar2 have the same definitions as above;

[0023] The hydrogen atoms in Ar1, Ar2, the hydrogen atoms on the dibenzofuran ring in formula IA, and the hydrogen atoms on the dibenzofuran ring in formula IB can each be independently replaced by deuterium atoms.

[0024] Preferably, the compound represented by Formula I includes compounds having structures shown in Formulas IA-1 to IA-4, and compounds having structures shown in Formulas IB-5 to IB-8.

[0025] ;

[0026] Ar1 and Ar2 have the same definitions as above;

[0027] The hydrogen atoms in Ar1, Ar2, the hydrogen atoms on the dibenzofuran ring in formulas IA-1 to IA-4, and the hydrogen atoms on the dibenzofuran ring in formulas IB-5 to IB-8 can each be independently replaced by deuterium atoms.

[0028] Preferably, the compound represented by Formula I is selected from any one of the following substituted or unsubstituted compounds:

[0029] ;

[0030] The substitution refers to the independent replacement of hydrogen atoms in the substituents at the Ar1 position, the substituents at the Ar2 position, and the hydrogen atoms on the dibenzofuran ring by deuterium atoms.

[0031] Examples are given below:

[0032] The structure of compound 1 is as follows:

[0033] ;

[0034] Where the substituent at the Ar1 position is phenylene and Ar2 is selected from hydrogen atoms, then the hydrogen atoms in the substituent at the Ar1 position and the hydrogen atoms on the dibenzofuran ring can be independently replaced by deuterium atoms, resulting in structures including but not limited to the following:

[0035] .

[0036] The structure of compound 2 is as follows:

[0037] ;

[0038] Where Ar1 is selected from a single bond and Ar2 is selected from a phenyl group, then the hydrogen atom in the substituent at the Ar2 position and the hydrogen atom on the dibenzofuran ring can be independently replaced by a deuterium atom, resulting in structures including but not limited to the following:

[0039] .

[0040] Preferably, the compound shown in Formula I includes the following compounds:

[0041] , , .

[0042] Preferably, the second component is selected from the compound shown in Formula A-1.

[0043] Preferably, the second component is selected from the compound shown in Formula A-2.

[0044] Preferably, the compound represented by formula A includes any one of the following compounds:

[0045] .

[0046] Preferably, the compound represented by formula A includes any one of the following compounds:

[0047] , , , .

[0048] It should be noted that there are no special restrictions on the preparation methods of the above-mentioned compound I and compound A in this invention, and commonly used preparation methods in the art are applicable.

[0049] In a second aspect, the present invention provides an organic electroluminescent device, the organic electroluminescent device comprising an anode, a cathode and an organic thin film layer disposed between the anode and the cathode, the organic thin film layer comprising a deuterated composition containing anthracene compounds as described in the first aspect.

[0050] Preferably, the organic thin film layer includes a light-emitting layer, the material of which includes a deuterated composition containing anthracene compounds as described in the first aspect.

[0051] Preferably, the main material of the light-emitting layer comprises a deuterated composition containing anthracene compounds as described in the first aspect.

[0052] Preferably, the material of the light-emitting layer further includes compounds having the structure shown in Formula II and / or compounds having the structure shown in Formula III:

[0053] ;

[0054] Among them, Ar 21 Ar 22 Each is independently selected from any one of substituted or unsubstituted C6-C20 (e.g., C6, C8, C10, C12, C16, or C20, etc.) aryl, substituted or unsubstituted C3-C20 (e.g., C3, C6, C8, C10, C12, C16, or C20, etc.) heteroaryl;

[0055] R 21 R 22 and R 23 Each is independently selected from hydrogen, C1-C12 (e.g., C1, C2, C4, C6, C8, C10 or C12, etc.) straight-chain or branched alkyl groups, and C6-C12 (e.g., C6, C8, C10 or C12, etc.) cycloalkyl groups;

[0056] Ar 21 Ar 22 The substituents described herein are each independently selected from C1-C5 (e.g., methyl, ethyl, propyl, n-butyl, isobutyl, tert-butyl, etc.) straight-chain or branched alkyl groups or C6-C12 (e.g., phenyl, diphenyl, naphthyl, etc.) aryl groups;

[0057] Ar 31 Ar 32 Ar 33 and Ar 34Each is independently selected from any one of substituted or unsubstituted C6-C22 (e.g., C6, C8, C10, C16, C18, or C22, etc.) aryl, substituted or unsubstituted C12-C40 (e.g., C12, C18, C20, C24, C30, C36, or C40, etc.) heteroaryl;

[0058] R 31 Selected from any one of phenyl, naphthyl, or biphenyl;

[0059] a is selected from 0 or 1;

[0060] Ar 31 Ar 32 Ar 33 Ar 34 The substituents described herein are each independently selected from C1-C5 straight-chain or branched alkyl groups (e.g., methyl, ethyl, propyl, n-butyl, isobutyl, tert-butyl, etc.) or C6-C12 (e.g., C6, C8, C10, or C12, etc.) aryl groups.

[0061] Preferably, the Ar 21 Ar 22 Each independently selected , , , , , , , , , , , , , , , , Any one of them.

[0062] Preferably, the R 21 R 22 and R 23 Each is independently selected from any one of hydrogen, methyl, ethyl, propyl, n-butyl, isobutyl, sec-butyl, tert-butyl, cyclohexyl, or adamantyl.

[0063] Preferably, the Ar 31 Ar 32 Ar 33 and Ar 34 Each independently selected , , , , , , , , , Any one or at least two of them.

[0064] Preferably, the formula The compound shown is selected from any one of the following compounds:

[0065] .

[0066] Preferably, the formula The compound shown is selected from any one of the following compounds:

[0067] .

[0068] Preferably, the material of the light-emitting layer further includes a compound having a structure as shown in Formula BDI:

[0069] BDI (Body-Induced Difference);

[0070] Among them, Ar 101 Ar 102 Ar 201 Ar 202 Each is independently selected from any one of substituted or unsubstituted C6-C40 (e.g., C6, C10, C12, C15, C18, C24, C30, C36, or C40) aryl groups, or substituted or unsubstituted C12-C20 (e.g., C12, C13, C14, C15, C16, C17, C18, C19, or C20) heteroaryl groups;

[0071] R 101 and R 102 Each is independently selected from any one of the following: substituted or unsubstituted C1-C12 (e.g., C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, or C12) alkyl, substituted or unsubstituted C6-C40 (e.g., C6, C10, C12, C15, C18, C24, C30, C36, or C40, etc.) aryl, and substituted or unsubstituted C12-C20 (e.g., C12, C13, C14, C15, C16, C17, C18, C19, or C20) heteroaryl;

[0072] R 101 and R 102 They can be connected in a ring using a single key;

[0073] m and n are each independently selected from 0 or 1, and m and n are not both 0 at the same time;

[0074] Ar 101 Ar 102 Ar 201 Ar 202 R 101 and R 102 The substituents described herein are each independently selected from any one or a combination of at least two of the following: -D, -F, -CN, C1-C12 (e.g., C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, or C12) alkyl, C1-C6 (e.g., C1, C2, C3, C4, C5, or C6) alkoxy, C2-C8 (e.g., C2, C3, C4, C5, C6, C7, or C8) alkenyl, C6-C15 (e.g., C6, C7, C8, C10, C12, or C15), and C12-C20 (e.g., C12, C15, C18, or C20) heteroaryl.

[0075] Preferably, the C6-C40 aryl group is selected from any one of phenyl, diphenyl, terphenyl, naphthyl, anthracene, phenanthryl, fluorenyl, benzo[a]fluorenyl, 9,10-diphenylanthryl, dibenzo[a]fluorenyl, naphthene, pyrene, perylene, spirofluorenyl, triphenylene, fluoranyl, hydrogenated benzo[a]anthryl, ind[a]fluorenyl, benzo[a]ind[a]fluorenyl, dibenzo[a]ind[a]fluorenyl, naphthene, or benzo[a]naphthenefluorenyl, and more preferably from any one of phenyl, naphthyl, diphenyl, terphenyl, fluoranyl, fluorenyl, 9,10-diphenylanthryl, or benzo[a]fluorenyl.

[0076] Preferably, the C12-C20 heteroaryl group is selected from any one of dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, dinaphthofuranyl, and dinaphthothiophenyl.

[0077] Preferably, the C1-C12 alkyl group is selected from any one of methyl, ethyl, propyl, butyl, adamantyl, 1-methylcyclohexyl, 1-methylcyclopentyl, cyclopentyl, or cyclohexyl.

[0078] Preferably, the C1-C6 alkoxy group is selected from methoxy, ethoxy, propoxy, butoxy, or... Any of the following, with dashed lines representing connection points.

[0079] Preferably, the C6-C15 aryl group is selected from any one of phenyl, naphthyl, or diphenyl.

[0080] Preferably, the Ar 101 and Ar 102Each group is independently selected from any one of the following groups, substituted or unsubstituted: phenyl, naphthyl, diphenyl, terphenyl, fluoranyl, 9,10-diphenylanthryl, benzofluorenyl, dibenzofuranyl, dibenzothiophene, naphthobenzofuranyl, or naphthobenzothiophene; the substituent is selected from -D (deuterium), -F, -CN, phenyl, biphenyl, dibenzofuranyl, methyl, deuterated methyl, adamantyl, tert-butyl, 1-methylcyclopentyl, cyclohexyl, cyclopentyl, methoxy, The dashed line represents the connection site, which is any one or a combination of at least two of the following: naphthyl, dibenzothiophene, and naphthobenzothiophene.

[0081] Preferably, the Ar 201 and Ar 202 Each of the substituents is independently selected from any one of the following groups, either substituted or unsubstituted: phenyl, naphthyl, dibenzofuranyl or diphenyl; the substituent is selected from any one or a combination of at least two of methyl, methoxy, phenyl or dibenzofuranyl.

[0082] Preferably, R 101 and R 102 Each is independently selected from any one of methyl, ethyl, propyl, or phenyl.

[0083] Preferably, R 101 and R 102 same.

[0084] Preferably, the compound represented by formula BDI is selected from any one of the following compounds:

[0085] .

[0086] Preferably, the organic thin film layer further includes a hole layer, which includes a hole transport layer, a hole injection layer, and an electron blocking layer.

[0087] Thirdly, the present invention provides a display device comprising the organic electroluminescent device as described in the second aspect.

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

[0089] This invention designs a composition using deuterated combinations and uses this as the main material for the light-emitting layer of an OLED light-emitting device, resulting in an OLED light-emitting device with lower driving voltage, higher current efficiency, and longer lifespan. Detailed Implementation

[0090] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0091] Synthesis Example 1

[0092] This synthetic example provides compound BH364D and its synthetic method, which is as follows:

[0093]

[0094] Under nitrogen atmosphere, 60 mL of toluene, 60 mL of ethanol, and 16 mL of water were added to a three-necked flask. Then, 3.0 g of raw material BH364D-1, 3.0 g of raw material BH364D-2, 2.12 g of sodium carbonate, and 0.23 g of tetrakis(triphenylphosphine)palladium were added. The mixture was slowly heated to reflux and reacted for 6 hours. After cooling to room temperature, water was added to dissolve the mixture. The organic layer was washed with water and dried with magnesium sulfate. After removing the desiccant, the mixture was concentrated to dryness and crystallized in a mixture of chloroform and ethanol to obtain compound BH364D (4.0 g).

[0095] The obtained compound BH364D was analyzed by mass spectrometry, and the mass-to-charge ratio (m / z) was found to be 475.20.

[0096] Synthesis Example 2

[0097] This synthetic example provides compound BH364-6 and its synthetic method, which is as follows:

[0098]

[0099] Compound BH364-6 was prepared according to the method in Example 1 of the synthesis.

[0100] The obtained compound BH364-6 was analyzed by mass spectrometry, and the mass-to-charge ratio (m / z) was found to be 470.17.

[0101] Other compounds for which specific synthetic steps are not listed can be prepared using common knowledge in the field, combined with the above synthetic examples.

[0102] The specific structures of the compounds used in the following application examples and comparative application examples are shown below:

[0103] .

[0104] Application Example 1

[0105] This application example provides a blue organic electroluminescent device, the structure of which is: ITO / HTL:HI-2(5%) (20nm) / HTL (50nm) / BH:BD-3(5%) (30nm) / TPBI(30nm) / Al (150nm);

[0106] The fabrication method of the above-mentioned organic electroluminescent device is as follows:

[0107] Each layer of material was placed inside a vacuum chamber, and the vacuum was evacuated to 1×10⁻⁶. -5 ~1×10 -6 Pa is sequentially vacuum-deposited onto the cleaned ITO substrate. Here, HTL:HI-2 (5%) (20 nm) refers to the fact that in this device, HTL and HI-2 are co-evaporated at a volume ratio of 95:5 to form a hole injection layer with a thickness of 20 nm.

[0108] BH:BD-3 (5%) (30nm) refers to the co-evaporation of BH and BD-3 at a volume ratio of 95:5 to form a light-emitting layer with a thickness of 30nm.

[0109] BH is the blue light host material (also called BH material). In this application example, the BH material consists of two compounds (host 1 (first component) and host 2 (second component)). When fabricating the device, the two compounds are placed in different evaporation sources and the heating temperature is controlled so that the ratio of the two compounds deposited on the substrate is 1:1 (volume ratio). In this embodiment, host 1 is compound 14 and host 2 is compound BH364.

[0110] In the device provided in this application example, HTL:HI-2(5%)(20nm) is the hole injection layer, and HTL(50nm) is the hole transport layer.

[0111] Application Example 2-3

[0112] Application Examples 2-3 provide an organic electroluminescent device, which differs from Application Example 1 only in that the BH material is different (the specific composition is shown in Table 1 below), while the other preparation steps are the same as in Application Example 1.

[0113] Compare and contrast examples 1-4

[0114] Comparative Application Examples 1-4 provide an organic electroluminescent device, which differs from Application Example 1 only in the BH material (as shown in Table 1 below). The other preparation steps are the same as in Application Example 1.

[0115] Performance testing

[0116] The test items include the brightness, driving voltage, current efficiency, and LT80 of the organic electroluminescent device; where LT80 refers to maintaining the device's initial brightness of 1000 cd / m². 2 With the current density remaining constant, the device efficiency drops to the initial luminance of 1000 cd / m². 2 The time required to achieve 80% of the corresponding efficiency. The drive voltage, current efficiency, and LT80 are all relative values.

[0117] The specific test results are shown in Table 1.

[0118] Table 1

[0119]

[0120] As shown in Table 1, this invention designs a deuterated composition by combining anthracene compounds containing deuterated phenyl and deuterated anthracene groups (body 1, first component) and body 2 (second component) to prepare a high-performance deuterated composition. Using this deuterated composition as the main material of the light-emitting layer of an OLED light-emitting device can enable the OLED light-emitting device to have a lower driving voltage, higher current efficiency and longer lifespan.

[0121] Application Example 4-6

[0122] Application Examples 4-6 provide an organic electroluminescent device, which differs from Application Example 1 only in the BH material (as shown in Table 2 below). The other preparation steps are the same as in Application Example 1.

[0123] Performance testing

[0124] The test items include the brightness, driving voltage, current efficiency, and LT80 of the organic electroluminescent device; where LT80 refers to maintaining the device's initial brightness of 1000 cd / m². 2 With the current density remaining constant, the device efficiency drops to the initial luminance of 1000 cd / m². 2 The time required to achieve 80% of the corresponding efficiency. The drive voltage, current efficiency, and LT80 are all relative values.

[0125] The specific test results are shown in Table 2.

[0126] Table 2

[0127]

[0128] As can be seen from the above, the present invention is designed by the composition of the deuterated combination. By combining the main body 1 (first component) and the second component 2 (second component), a deuterated composition with excellent performance is prepared. Using this deuterated composition as the main material of the light-emitting layer of the OLED light-emitting device, the OLED light-emitting device can have a lower driving voltage, higher current efficiency and longer lifespan.

[0129] The applicant declares that the detailed process flow of this invention is illustrated by the above embodiments, but this invention is not limited to the above detailed process flow, that is, it does not mean that this invention must rely on the above detailed process flow to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the product of this invention, addition of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A deuterated composition containing anthracene compounds, characterized in that, The deuterated composition containing anthracene compounds comprises a first component and a second component; The first component includes anthracene compounds having the structure shown in Formula I: Formula I; Ar1 is selected from any one of single bonds, phenylene, naphthylene, or biphenylene; Ar2 is selected from any one of hydrogen atom, phenyl, naphthyl or biphenyl; The hydrogen atoms in Ar1, Ar2, and the hydrogen atoms on the dibenzofuran ring in Formula I can each be independently replaced by deuterium atoms; The second component includes compound A, which comprises a compound having the structure shown in Formula A-1 or a compound having the structure shown in Formula A-2. ； Among them, Ar 301 Ar 302 Each is independently selected from at least one of phenyl, naphthyl, or biphenyl; In the compounds shown in Formula A-1 and Formula A-2, the hydrogen atoms can be independently replaced by deuterium atoms.

2. The deuterated composition containing anthracene compounds according to claim 1, characterized in that, The compound represented by Formula I includes a compound having the structure shown in Formula IA or a compound having the structure shown in Formula IB: ； Ar1 and Ar2 have the same definition as in claim 1; The hydrogen atoms in Ar1, Ar2, the hydrogen atoms on the dibenzofuran ring in formula IA, and the hydrogen atoms on the dibenzofuran ring in formula IB can each be independently replaced by deuterium atoms. Preferably, the compound represented by Formula I includes compounds having structures shown in Formulas IA-1 to IA-4, and compounds having structures shown in Formulas IB-5 to IB-8. ； Ar1 and Ar2 have the same definition as in claim 1; The hydrogen atoms in Ar1, Ar2, the hydrogen atoms on the dibenzofuran ring in formulas IA-1 to IA-4, and the hydrogen atoms on the dibenzofuran ring in formulas IB-5 to IB-8 can each be independently replaced by deuterium atoms.

3. The deuterated composition containing anthracene compounds according to claim 1 or 2, characterized in that, The compound represented by Formula I is selected from any one of the following substituted or unsubstituted compounds: ； The substitution refers to the fact that the hydrogen atoms in the substituents at the Ar1 position, the hydrogen atoms in the substituents at the Ar2 position, and the hydrogen atoms on the dibenzofuran ring in the above compounds can each be independently replaced by deuterium atoms; Preferably, the compound shown in Formula I includes the following compounds: 、 、 。 4. The deuterated composition containing anthracene compounds according to any one of claims 1-3, characterized in that, The second component is selected from the compound shown in formula A-1; Preferably, the second component is selected from the compound shown in Formula A-2.

5. The deuterated composition containing anthracene compounds according to any one of claims 1-4, characterized in that, The compound represented by formula A includes any one of the following compounds: ； Preferably, the compound represented by formula A includes any one of the following compounds: 、 、 、 。 6. An organic electroluminescent device, characterized in that, The organic electroluminescent device includes an anode, a cathode, and an organic thin film layer disposed between the anode and the cathode, wherein the organic thin film layer includes a deuterated composition containing anthracene compounds as described in any one of claims 1-5; Preferably, the organic thin film layer includes a light-emitting layer, the material of which includes a deuterated composition containing anthracene compounds as described in any one of claims 1-5; Preferably, the main material of the light-emitting layer comprises a deuterated composition containing anthracene compounds as described in any one of claims 1-5.

7. The organic electroluminescent device according to claim 6, characterized in that, The material of the light-emitting layer further includes compounds having the structure shown in Formula II and / or compounds having the structure shown in Formula III: ； Among them, Ar 21 Ar 22 Each is independently selected from any one of substituted or unsubstituted C6-C20 aryl groups or substituted or unsubstituted C3-C20 heteroaryl groups; R 21 R 22 and R 23 Each is independently selected from any one of hydrogen, C1-C12 straight-chain or branched alkyl, and C6-C12 cycloalkyl; Ar 21 Ar 22 The substituents described herein are each independently selected from C1-C5 straight-chain or branched alkyl groups or C6-C12 aryl groups; Ar 31 Ar 32 Ar 33 and Ar 34 Each is independently selected from any one of substituted or unsubstituted C6-C22 aryl groups or substituted or unsubstituted C12-C40 heteroaryl groups; R 31 Selected from any one of phenyl, naphthyl, or biphenyl; a is selected from 0 or 1; Ar 31 Ar 32 Ar 33 Ar 34 The substituents described herein are each independently selected from C1-C5 straight-chain or branched alkyl groups or C6-C12 aryl groups.

8. The organic electroluminescent device according to claim 7, characterized in that, The Ar 21 Ar 22 Each independently selected , , , , , , , , , , , , , , , , Any one of them; Preferably, the R 21 R 22 and R 23 Each is independently selected from any one of hydrogen, methyl, ethyl, propyl, n-butyl, isobutyl, sec-butyl, tert-butyl, cyclohexyl, or adamantyl; Preferably, the Ar 31 Ar 32 Ar 33 and Ar 34 Each independently selected , , , , , , , , , Any one or at least two of them; Preferably, the formula The compound shown is selected from any one of the following compounds: ； Preferably, the formula The compound shown is selected from any one of the following compounds: 。 9. The organic electroluminescent device according to any one of claims 6-8, characterized in that, The material of the light-emitting layer also includes compounds having a structure as shown in Formula BDI: BDI (Body-Induced Difference); Among them, Ar 101 Ar 102 Ar 201 Ar 202 Each is independently selected from any one of substituted or unsubstituted C6-C40 aryl groups or substituted or unsubstituted C12-C20 heteroaryl groups; R 101 and R 102 Each is independently selected from any one of substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C6-C40 aryl, or substituted or unsubstituted C12-C20 heteroaryl; R 101 and R 102 They can be connected in a ring using a single key; m and n are each independently selected from 0 or 1, and m and n are not both 0 at the same time; Ar 101 Ar 102 Ar 201 Ar 202 R 101 and R 102 The substituents described herein are each independently selected from any one or a combination of at least two of -D, -F, -CN, C1-C12 alkyl, C1-C6 alkoxy, C2-C8 alkenyl, C6-C15 aryl, and C12-C20 heteroaryl.

10. The organic electroluminescent device according to claim 9, characterized in that, The C6-C40 aryl group is selected from any one of phenyl, diphenyl, terphenyl, naphthyl, anthracene, phenanthryl, fluorenyl, benzo[a]fluorenyl, 9,10-diphenylanthryl, dibenzo[a]fluorenyl, naphthene, pyrene, perylene, spirofluorenyl, triphenylene, fluoranyl, hydrogenated benzo[a]anthryl, ind[a]fluorenyl, benzo[a]ind[a]fluorenyl, dibenzo[a]ind[a]fluorenyl, naphthene, or benzo[a]naphthene, preferably any one of phenyl, naphthyl, diphenyl, terphenyl, fluoranyl, fluorenyl, 9,10-diphenylanthryl, or benzo[a]fluorenyl. Preferably, the C12-C20 heteroaryl group is selected from any one of dibenzofuranyl, dibenzothiophenyl, naphthobenzofuranyl, naphthobenzothiophenyl, dinaphthofuranyl, and dinaphthothiophenyl; Preferably, the C1-C12 alkyl group is selected from any one of methyl, ethyl, propyl, butyl, adamantyl, 1-methylcyclohexyl, 1-methylcyclopentyl, cyclopentyl, or cyclohexyl; Preferably, the C1-C6 alkoxy group is selected from methoxy, ethoxy, propoxy, butoxy, or... Any of the following, with dashed lines representing connection points; Preferably, the C6-C15 aryl group is selected from any one of phenyl, naphthyl, or diphenyl; Preferably, the Ar 101 and Ar 102 Each group is independently selected from any one of the following groups, substituted or unsubstituted: phenyl, naphthyl, diphenyl, terphenyl, fluoranyl, 9,10-diphenylanthryl, benzofluorenyl, dibenzofuranyl, dibenzothiophene, naphthobenzofuranyl, or naphthobenzothiophene; the substituent is selected from deuterium, -F, -CN, phenyl, biphenyl, dibenzofuranyl, methyl, deuterated methyl, adamantyl, tert-butyl, 1-methylcyclopentyl, cyclohexyl, cyclopentyl, methoxy, The combination of any one or at least two of naphthyl, dibenzothiophene, and naphthobenzothiophene, with dashed lines indicating connection sites; Preferably, the Ar 201 and Ar 202 Each group is independently selected from any one of the following groups, either substituted or unsubstituted: phenyl, naphthyl, dibenzofuranyl or diphenyl; the substituted group is selected from any one or a combination of at least two of methyl, methoxy, phenyl or dibenzofuranyl. Preferably, R 101 and R 102 Each is independently selected from any one of methyl, ethyl, propyl, or phenyl; Preferably, R 101 and R 102 same; Preferably, the compound represented by formula BDI is selected from any one of the following compounds: 。

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