An organic compound, an OLED having the same, and use thereof

Abstract

This invention relates to the field of organic optoelectronic material preparation technology, specifically to an organic compound, an OLED containing the compound, and its applications. The organic compound of this invention introduces an alkyl group at the 2-position of the 1, 2, and 3-positions of the benzene ring, and introduces substituted diarylamines at the 1 and 3-positions to construct 1- and 3-substituted diarylamines. This significantly improves the material's lifetime in devices while maintaining good transport performance. Specifically, using the organic compound of this invention as a functional layer, especially as a hole transport or light-emitting auxiliary layer material, in the fabrication of organic electroluminescent devices can suppress device efficiency roll-off, effectively improve device luminous efficiency, and extend device lifetime. The preparation process of the compound of this invention is simple and easy, the raw materials are readily available, it is suitable for mass production scale-up, and has good industrialization prospects.

Description

Technical Field

[0001] This invention relates to the field of organic optoelectronic material preparation technology, specifically to an organic compound, an OLED having the compound, and its applications. Background Technology

[0002] Organic light-emitting diodes (OLEDs), also known as organic electroluminescent devices, are a technology that uses organic materials to emit light through carrier injection and recombination under the influence of an electric field. They convert electrical energy into light energy through organic light-emitting materials. OLEDs are essentially thin-film stacked devices. Theoretically, with both the anode and cathode being transparent electrodes, light emitted from the light-emitting layer can propagate from either the anode or the cathode to the outside of the device. Therefore, based on the different light propagation paths, devices can be divided into bottom-emitting devices and top-emitting devices. In bottom-emitting devices, light propagates from the anode through the substrate to the outside of the device, while in top-emitting devices, light propagates through the cathode to the outside of the device. Top-emitting devices emit light from the cathode side, eliminating the need for a substrate, resulting in a more detailed and clearer image, as well as higher color vibrancy. However, in the structure of top-emitting organic electroluminescent devices, brightness and color can vary significantly under different viewing angles, severely affecting product performance.

[0003] Currently, OLED display technology still suffers from high driving voltage and short display lifespan, severely hindering its further practical application. Therefore, continuous efforts are needed to develop organic light-emitting devices with low driving voltage, high brightness, and long lifespan. Organic hole materials play a crucial role in transferring holes injected from the anode to the emissive layer. Hole transport materials with excellent hole mobility are beneficial for carrier injection balance in the device, thereby reducing the device's driving voltage. On the other hand, to prevent excitons generated in the emissive layer from diffusing into the hole transport layer, leading to color shift and reduced luminous efficiency, the hole transport layer also needs to block exciton diffusion outwards, preventing efficiency roll-off and improving device stability.

[0004] To continuously improve the performance of OLED devices, innovation is needed not only in OLED device structure and manufacturing processes, but also in OLED optoelectronic functional materials. This requires ongoing research and innovation to create higher-performance OLED functional materials and to rationally combine them with existing materials to improve device luminous efficiency and lifespan. Therefore, finding suitable OLED optoelectronic functional materials for OLED devices to address these issues is a long-standing need in this field. Summary of the Invention

[0005] To address the problems existing in the prior art, this application provides an organic compound, an OLED having the compound, and its applications. The organic compound of this invention is particularly suitable for use in light-related devices or elements. Specifically, the compound of this invention can serve as a hole transport layer or a light-emitting auxiliary layer in said devices or elements, contributing to improved luminous efficiency and lifetime of the light-emitting devices or elements. In particular, using the compound of this invention as a hole transport layer or light-emitting auxiliary layer, and applying it together with specific light-emitting layer materials in devices or elements, enables the devices or elements to exhibit higher BI luminous efficiency and longer lifetime.

[0006] This invention provides an organic compound having the structure shown in formula (I):

[0007]

[0008] In formula (I), R is selected from any one of C1-C30 alkyl groups and C3-C24 cycloalkyl groups;

[0009] Ar1-Ar4 are each independently selected from substituted or unsubstituted C6-C30 aryl groups and substituted or unsubstituted C3-C30 heteroaryl groups;

[0010] L1-L4 are each independently selected from single-bonded, substituted or unsubstituted C6-C30 arylene groups; when substituted, the substituted group is selected from C1-C10 alkyl groups.

[0011] In a preferred embodiment, R is selected from any one of C1-C6 alkyl groups and C3-C12 cycloalkyl groups.

[0012] In a more preferred embodiment, R is selected from any one of methyl, ethyl, isopropyl, tert-butyl, cyclopentyl, and cyclohexyl.

[0013] In a preferred embodiment, Ar1-Ar4 are each independently selected from any one of phenyl, biphenyl, terphenyl, naphthyl, methylbenzene, dimethylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazoleyl, and N-phenyl-carbazoleyl, either identically or differently.

[0014] In a preferred embodiment, each of L1-L4 is independently selected from single bonds, arylene groups, or methyl-substituted arylene groups.

[0015] One or more hydrogen atoms in the compound represented by formula (I) of the present invention may be substituted with deuterium, tritium, cyano or halogen.

[0016] According to one or more embodiments, the organic compounds of the present invention are selected from any of the following chemical structures, wherein "D" represents deuterium:

[0017]

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[0020]

[0021]

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[0024]

[0025]

[0026]

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[0031]

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[0033]

[0034]

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[0036]

[0037]

[0038] According to one or more embodiments, the present invention also provides the use of organic compounds having the structure shown in formula (I) above in the preparation of organic electroluminescent devices.

[0039] The present invention also provides an organic electroluminescent device, comprising: a substrate layer; a first electrode on the substrate; an organic light-emitting functional layer on the first electrode; and a second electrode on the organic light-emitting functional layer; wherein the organic light-emitting functional layer comprises an organic compound having the structure shown in formula (I) above.

[0040] In a preferred embodiment, the organic light-emitting functional layer includes a hole transport layer, a light-emitting layer, and a light-emitting auxiliary layer located between the hole transport layer and the light-emitting layer; the hole transport layer or the light-emitting auxiliary layer contains an organic compound with the structure shown in formula (I) above.

[0041] Optionally, the light-emitting layer of the organic electroluminescent device further includes a light-emitting composition component, which includes compounds with the structure shown in formula (II) and compounds with the structure shown in formula (III).

[0042]

[0043] In formula (II), Q1-Q2 and in formula (III), Q3-Q5 are each independently selected from hydrogen, deuterium, and C6-C30 aryl groups.

[0044] In some embodiments, Q1-Q2 and Q3-Q5 are each independently selected from one or more of hydrogen, deuterium, phenyl, biphenyl, and naphthyl.

[0045] Preferably, the compounds with the structure shown in formula (II) and the compounds with the structure shown in formula (III) in the luminescent composition are combined in equal proportions.

[0046] In some embodiments, the compound with the structure shown in formula (II) is selected from any of the following chemical structures, where “D” represents deuterium:

[0047]

[0048] In some embodiments, the compound with the structure shown in formula (III) is selected from any of the following chemical structures, where “D” represents deuterium:

[0049]

[0050] Preferably, different organic light-emitting materials are stacked and combined horizontally or vertically in the organic electroluminescent device.

[0051] The organic electroluminescent device of the present invention can be used in OLED lighting and display devices. Specifically, it can be used in commercial applications, such as displays for electronic, electrical, instrumentation products and equipment.

[0052] Preferably, the organic electroluminescent device prepared by the present invention is used in smartphones, tablets, smart wearable devices, televisions, VR, microdisplays, as well as automotive central control screens or automotive taillights.

[0053] The present invention also provides a composition comprising an organic compound having the general structure shown in formula (I) above.

[0054] The present invention also provides a formulation comprising an organic compound of the general formula (I) above, or a composition as described above, and at least one solvent. The solvent is not particularly limited and may be any solvent well known to those skilled in the art, such as unsaturated hydrocarbon solvents, halogenated saturated hydrocarbon solvents, halogenated unsaturated hydrocarbon solvents, ether solvents, or ester solvents; wherein the unsaturated hydrocarbon solvent is toluene, xylene, mesitylene, tetrahydronaphthalene, n-butylbenzene, sec-butylbenzene, or tert-butylbenzene; the halogenated saturated hydrocarbon solvent is carbon tetrachloride, chloroform, dichloromethane, dichloroethane, chlorobutane, bromobutane, chloropentane, bromopentane, chlorohexane, bromohexane, chlorocyclohexane, or bromocyclohexane; the halogenated unsaturated hydrocarbon solvent is chlorobenzene, dichlorobenzene, or trichlorobenzene; the ether solvent is tetrahydrofuran or tetrahydropyran; and the ester solvent is an alkyl benzoate ester.

[0055] The present invention also provides a display or lighting device comprising one or more of the organic electroluminescent devices described above.

[0056] Compared with the prior art, the beneficial effects of the present invention are:

[0057] The organic compounds involved in this invention introduce alkyl groups at the 2-position of the benzene ring (positions 1, 2, and 3) and substituted diarylamines at the 1- and 3-positions to construct 1- and 3-substituted diarylamines. This significantly improves the material's lifetime in devices while maintaining good transport performance. Specifically, using the organic compounds of this invention as functional layers, especially as hole transport or light-emitting auxiliary layer materials, in the fabrication of organic electroluminescent devices can suppress efficiency roll-off and effectively extend device lifetime. The preparation process of the compounds of this invention is simple and easy, the raw materials are readily available, suitable for mass production scale-up, and has good industrialization prospects. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention. Unless otherwise stated, all commercial reagents involved in the following experiments were purchased and used directly, and specific reagents were directly customized and used from Tianjin Zhujinshi Chemical Co., Ltd.

[0059] In this invention, "C1-C24 alkyl" refers to a monovalent alkyl group having 1-24 carbon atoms, preferably 1-10 carbon atoms, more preferably 1-6 carbon atoms or 1-3 carbon atoms. Examples of this term include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-hexyl, etc. Furthermore, the alkyl group may optionally be substituted.

[0060] The "C6-C30 aryl" as used in this invention refers to an unsaturated aromatic carbon ring having 6-30 carbon atoms and possessing a monocyclic (e.g., phenyl) or polycyclic fused (e.g., naphthyl or anthracene) structure. Preferably, it has 6-18 carbon atoms, more preferably 6-12 carbon atoms. Preferred aryl groups include phenyl, naphthyl, etc. Unless otherwise defined for individual substituents, such aryl groups may optionally be substituted with 1-3 of the following substituents: hydroxyl, acyl, acyloxy, alkyl, alkoxy, alkenyl, alkynyl, amino, aminoacyl, aryl, aryloxy, carboxyl, carboxyl ester, aminocarboxyl ester, cyano, halogen, nitro, heteroaryl, heterocyclic, thioalkoxy, trihalomethyl, etc. Preferred substituents include alkyl, alkoxy, halogen, cyano, nitro, trihalomethyl, and thioalkoxy. However, this is not a limitation.

[0061] The "substitution" mentioned in this invention is a mono, di, tri, tetra, or penta-substitution, independently selected from deuterium, methyl, ethyl, isopropyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, phenyl, biphenyl, or benzyl.

[0062] Throughout this specification, unless explicitly stated otherwise, the term "including" any component will be understood to imply the inclusion of other components, not to exclude any other components. Furthermore, it should be understood that throughout this specification, when an element such as a layer, film, region, or substrate is referred to as being "on" or "above" another element, it may be "directly on" the other element, or there may be intermediate elements present. Additionally, "on" or "above" means located above the target portion, and not necessarily above it in the direction of gravity.

[0063] One object of the present invention is to provide an electroluminescent device (OLED) comprising: a substrate layer; a first electrode on the substrate; an organic light-emitting functional layer on the first electrode; a second electrode on the organic light-emitting functional layer; the organic light-emitting functional layer comprising a hole transport layer, a light-emitting layer, and a light-emitting auxiliary layer located between the hole transport layer and the light-emitting layer; preferably, the hole transport layer or the light-emitting auxiliary layer comprises an organic compound with the structure shown in formula (I).

[0064] In a preferred embodiment of the present invention, the light-emitting layer comprises a light-emitting composition, the light-emitting composition comprising compounds having the structure shown in formula (II) and compounds having the structure shown in formula (III).

[0065] The substrate described in this invention can be any substrate typically used in organic light-emitting devices. It can be a glass or transparent plastic substrate, an opaque material such as silicon or stainless steel, or a flexible PI film. Different substrates have different mechanical strengths, thermal stability, transparency, surface smoothness, and water resistance, and their applications vary depending on their properties. For other materials used in electromechanical light-emitting devices, any known materials used in OLED devices can be selected.

[0066] As a guest material capable of producing blue fluorescence, blue phosphorescence, green fluorescence, green phosphorescence, and blue-green fluorescence, it not only needs to have extremely high fluorescence quantum luminescence efficiency, but also needs to have an appropriate energy level to effectively absorb the excitation energy of the host material and emit light. There are no particular limitations on such materials.

[0067] Example 1: Synthesis of compound P7

[0068]

[0069] Add A1 (10 mmol), B1 (22 mmol), sodium tert-butoxide (22 mmol), and 200 mL of toluene to a three-necked reaction flask. After purging with nitrogen three times, add Pd2(dba)3 (5 × 10⁻⁶) -2 mmoL), S-Phos (5×10) -2 The mixture was heated to 110°C and reacted under reflux for 6 hours, then the reaction was stopped. The mixture was cooled to room temperature, and then 200 mL of water was added, resulting in layer separation. After washing twice with water, the mixture was concentrated to remove toluene, and then 100 mL of n-heptane was added. The mixture was stirred for 2 hours to obtain intermediate product P. 7-1 .

[0070] Add P to the three-necked reaction flask 7-1 (10 mmol / L), B1 (22 mmol / L), sodium tert-butoxide (22 mmol / L), toluene 200 mL, after nitrogen purging, add Pd2(dba)3 (5 × 10⁻⁶) -2 mmoL), tri-tert-butylphosphine (5×10) -2 The mixture was heated to 110℃ and reacted under reflux for 6 hours, then the reaction was stopped. The mixture was cooled to room temperature, and 200 mL of water was added, resulting in separation of the layers. After washing twice with water, the mixture was concentrated to remove toluene, and 100 mL of methanol was added. The mixture was stirred for 6 hours, filtered, and the resulting solid was recrystallized twice with ethyl acetate to obtain the target product P7. LC-MS (m / z)(M+): theoretical value 730.33, measured value 730.35.

[0071] Example 2: Compound P 10 Synthesis

[0072]

[0073] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 10 The yield of the final product was 87%. LC-MS (m / z)(M+): theoretical value 811.40, measured value 811.62.

[0074] Example 3: Compound P 12 Synthesis

[0075] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 12 The yield of the final product was 65%. LC-MS (m / z)(M+): theoretical value 838.43, measured value 838.48.

[0076] Example 4: Compound P 20 Synthesis

[0077] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 20 The yield of the final product was 62%. LC-MS (m / z)(M+): theoretical value 838.36, measured value 838.42.

[0078] Example 5: Compound P 26 Synthesis

[0079] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 26 The yield of the final product was 59%. LC-MS (m / z)(M+): theoretical value 870.31, measured value 870.46.

[0080] Example 6: Compound P 40 Synthesis

[0081] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 40 The yield of the final product was 74%. LC-MS (m / z)(M+): theoretical value 811.40, measured value 811.53.

[0082] Example 7: Compound P 42 Synthesis

[0083] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 42 The yield of the final product was 60%. LC-MS (m / z)(M+): theoretical value 650.24, measured value 650.37.

[0084] Example 8: Compound P 70 Synthesis

[0085] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 70 The yield of the final product was 83%. LC-MS (m / z)(M+): theoretical value 890.46, measured value 890.72.

[0086] Example 9: Compound P 75 Synthesis

[0087] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 75 The yield of the final product was 71%. LC-MS (m / z)(M+): theoretical value 508.29, measured value 508.43.

[0088] Example 10: Compound P 82 Synthesis

[0089] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 82 The yield of the final product was 88%. LC-MS (m / z)(M+): theoretical value 864.44, measured value 864.91.

[0090] Example 11: Compound P 86 Synthesis

[0091] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 86 The yield of the final product was 62%. LC-MS (m / z)(M+): theoretical value 1016.51, measured value 1016.58.

[0092] Example 12: Compound P 104 Synthesis

[0093] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 104 The yield of the final product was 71%. LC-MS (m / z)(M+): theoretical value 1042.50, measured value 1042.66.

[0094] Example 13: Compound P 110 Synthesis

[0095] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 110 The yield of the final product was 62%. LC-MS (m / z)(M+): theoretical value 748.38, measured value 748.41.

[0096] Example 14: Compound P 115 Synthesis

[0097] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 115 The yield of the final product was 58%. LC-MS (m / z)(M+): theoretical value 984.44, measured value 984.67.

[0098] Example 15: Compound P 142 Synthesis

[0099] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 142 The yield of the final product was 89%. LC-MS (m / z)(M+): theoretical value 944.51, measured value 944.72.

[0100] Example 16: Compound P 190 Synthesis

[0101] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 190 The yield of the final product was 84%. LC-MS (m / z)(M+): theoretical value 838.43, measured value 838.71.

[0102] Example 17: Compound P 222 Synthesis

[0103] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 222 The yield of the final product was 75%. LC-MS (m / z)(M+): theoretical value 634.33, measured value 634.52.

[0104] Example 18: Compound P 231 Synthesis

[0105] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 231 The yield of the final product was 72%. LC-MS (m / z)(M+): theoretical value 914.46, measured value 914.47.

[0106] Example 19: Compound P 258 Synthesis

[0107] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 258 The yield of the final product was 63%. LC-MS (m / z)(M+): theoretical value 678.27, measured value 678.35.

[0108] Example 20: Compound P 260 Synthesis

[0109] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 260 The yield of the final product was 60%. LC-MS (m / z)(M+): theoretical value 886.43, measured value 886.82.

[0110] Example 21: Compound P 264 Synthesis

[0111] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 264 The yield of the final product was 61%. LC-MS (m / z)(M+): theoretical value 826.43, measured value 826.57.

[0112] Example 22: Compound P 265 Synthesis

[0113] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 265 The yield of the final product was 66%. LC-MS (m / z)(M+): theoretical value 950.46, measured value 950.67.

[0114] Example 23: Compound P 276 Synthesis

[0115] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 276 The yield of the final product was 68%. LC-MS (m / z)(M+): theoretical value 826.36, measured value 826.59.

[0116] Example 24: Compound P 286 Synthesis

[0117] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 286 The yield of the final product was 81%. LC-MS (m / z)(M+): theoretical value 918.49, measured value 918.69.

[0118] Example 25: Compound P 294 Synthesis

[0119] Compound P was prepared by referring to the synthesis method of compound P7 in Example 1. 12 The yield of the final product was 71%. LC-MS (m / z)(M+): theoretical value 825.49, measured value 825.68.

[0120] The following are several examples of applications of the organic compounds described in this invention in OLED devices to further illustrate the beneficial effects of the compounds. The materials used in the examples were either commercially available or synthesized in-house:

[0121] Device Example: Structure and Fabrication Method of Application Example 1:

[0122] As a reference fabrication method for a device embodiment, the structure of the light-emitting device provided by the present invention is as follows: First, an alkali-free glass substrate is washed with isopropanol for 15 minutes using an ultrasonic cleaner, and then subjected to UV ozone washing treatment in air for 30 minutes. The treated substrate is then subjected to vacuum evaporation. First, ITO / Ag / ITO (100nm) is deposited as the anode. Then, a hole injection layer (HT:PD, 10nm), a hole transport layer (HT, 120nm), a light-emitting auxiliary material (P7, 50nm), a light-emitting layer (compound H1-002:H2-003 (50:50), 27nm, and dopant GD, 3nm), an electron transport layer (ET:Liq (50:50), 30nm), and an electron injection layer (Yb, 1nm) are deposited in sequence. Finally, Mg and Ag (weight ratio 10:1, 15nm) are co-deposited to form a semi-transparent cathode. Then, compound CPL (65nm) is deposited as a capping layer. Finally, the light-emitting device was encapsulated using epoxy resin adhesive under a nitrogen atmosphere, referred to as Application Example 1. The molecular structural formulas of the relevant materials are shown below:

[0123]

[0124] Following the method provided in Application Example 1, Application Examples 2-25 and Comparative Examples 1-3 were prepared. The only difference was that the luminescent auxiliary materials listed in Table 1 were used instead of compound P7 in Application Example 1. The current efficiency and lifetime of the devices prepared in the application examples and comparative examples were tested using standard methods, and the device luminescence characteristics are shown in Table 1. The chemical structures of the luminescent auxiliary materials in Comparative Examples 1-3 are as follows:

[0125]

[0126] Table 1 Device Test Data

[0127]

[0128]

[0129] As can be seen from the data in Table 1, compared with Comparative Examples 1-3, the devices prepared from the organic compounds of the present invention in Application Examples 1 to 25 exhibit better luminous efficiency and longer lifespan, especially with a significant improvement in lifespan. The performance improvements of each device are achieved based on the better electron transport capability of the organic compound materials of the present invention. This indicates that the organic compounds provided by the present invention have certain commercial application value.

[0130] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An organic compound, characterized in that, The organic compound has the structure shown in formula (I): In formula (I), R is selected from any one of C1-C30 alkyl groups and C3-C24 cycloalkyl groups; Ar1-Ar4 are each independently selected from substituted or unsubstituted C6-C30 aryl groups and substituted or unsubstituted C3-C30 heteroaryl groups; L1-L4 are each independently selected from single bonds and substituted or unsubstituted C6-C30 arylene groups; when substituted, the substituted group is selected from C1-C10 alkyl groups.

2. The organic compound according to claim 1, wherein R is selected from any one of methyl, ethyl, isopropyl, tert-butyl, cyclopentyl, and cyclohexyl.

3. The organic compound according to claim 1, wherein each of Ar1-Ar4 is independently selected from any one of phenyl, biphenyl, terphenyl, naphthyl, methylbenzene, dimethylfluorenyl, dibenzofuranyl, dibenzothiopheneyl, carbazoleyl, and N-phenyl-carbazoleyl, either identically or differently.

4. The organic compound according to claim 1, wherein each of L1-L4 is independently selected from single bonds, arylene groups, or methyl-substituted arylene groups.

5. The organic compound according to claim 1, wherein one or more hydrogen atoms in the organic compound may be substituted with deuterium, tritium, cyano or halogen.

6. The organic compound according to claim 1, characterized in that, The compound is selected from any of the chemical structures shown below, where "D" represents deuterium:

7. The use of the organic compound according to any one of claims 1-6 in the preparation of organic electroluminescent devices.

8. An organic electroluminescent device, characterized in that, The organic electroluminescent device comprises: a substrate layer; a first electrode on the substrate; an organic light-emitting functional layer on the first electrode; a second electrode on the organic light-emitting functional layer; the organic light-emitting functional layer includes a hole transport layer and a light-emitting layer; the hole transport layer contains an organic compound as described in any one of claims 1-6.

9. The organic electroluminescent device according to claim 8, characterized in that, The organic light-emitting functional layer further includes a light-emitting auxiliary layer located between the hole transport layer and the light-emitting layer; the light-emitting auxiliary layer contains the organic compound according to any one of claims 1-6.

10. The organic electroluminescent device according to claim 8, characterized in that, The light-emitting layer comprises a light-emitting composition, which includes compounds having the structure shown in Formula (III) and the structure shown in Formula (IV); In formula (II), Q1-Q2 are each independently selected from hydrogen, deuterium, and C6-C30 aryl groups; in formula (III), Q3-Q4 are each independently selected from hydrogen, deuterium, and C6-C30 aryl groups.

11. The organic electroluminescent device according to claim 10, characterized in that, Q1-Q2 and Q3-Q4 are each independently selected from hydrogen, deuterium, phenyl, biphenyl, and naphthyl.

12. The organic electroluminescent device according to claim 10, characterized in that, The luminescent composition comprises compounds of formula (II) and formula (III) in equal proportions.

13. The organic electroluminescent device according to claim 10, characterized in that, The compound with the structure shown in formula (II) is selected from any of the following chemical structures, where "D" represents deuterium:

14. The organic electroluminescent device according to claim 10, characterized in that, Compounds with the structure shown in formula (III) are selected from any of the following chemical structures, where "D" represents deuterium:

15. A display or lighting device, characterized in that, The device includes the organic electroluminescent device as described in claim 7.

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