Carbazole-containing compound, organic electroluminescent device and display device
By designing carbazole-containing compounds as the main material for the light-emitting layer of organic electroluminescent devices, the problems of insufficient transmission performance and efficiency of existing materials have been solved, achieving low driving voltage and high current efficiency, and extending the device lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FUYANG SINEVA MATERIAL TECHNOLOGY CO LTD
- Filing Date
- 2025-12-09
- Publication Date
- 2026-04-21
AI Technical Summary
The transmission performance and luminous efficiency of existing organic electroluminescent materials are insufficient in practical applications, which affects the industrialization process of OLED devices.
A carbazole-containing compound was designed and synthesized for use as the host material for the light-emitting layer of organic electroluminescent devices. The luminescence performance of the material was improved by optimizing the compound structure.
This effectively reduces the driving voltage of organic electroluminescent devices, improves current efficiency, and extends the device's lifespan.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of organic optoelectronic technology, specifically relating to a carbazole-containing compound, an organic electroluminescent device, and a display device. Background Technology
[0002] Organic light emitting diodes (OLEDs) are display components that utilize the phenomenon of self-emission. They have a wider viewing angle and are thinner, lighter, and faster than liquid crystal displays. They can also achieve flexible displays, making them highly anticipated for use as full-color display components or lighting equipment.
[0003] Organic light emission typically refers to the phenomenon of converting electrical energy into light energy using organic materials. Organic light-emitting devices that utilize organic light emission usually have a structure that includes an anode, a cathode, and an organic layer sandwiched between the anode and the cathode.
[0004] To improve the efficiency and stability of organic light-emitting elements (OLEDs), the organic layer is often composed of a multilayer structure made of different materials. For example, it may consist of a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer. When a voltage is applied between the two electrodes in this OLED structure, holes from the anode are injected into the organic layer, and electrons from the cathode are also injected into the organic layer. When the injected holes and electrons meet, they form excitons. When these excitons release energy and transition to the ground state, they emit photons, thus producing light. OLEDs are widely recognized for their self-emissive nature, high brightness, high efficiency, low driving voltage, wide viewing angle, high contrast, and high-speed response.
[0005] Currently, research on organic electroluminescent materials has been widely carried out in academia and industry. Among these, the material's transport properties and luminous efficiency restrict the industrialization of light-emitting devices. Therefore, designing and searching for a compound as a novel OLED material to overcome its shortcomings in practical applications is a key focus and future research trend in OLED materials research. Summary of the Invention
[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a carbazole-containing compound, an organic electroluminescent device, and a display device.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] In a first aspect, the present invention provides a carbazole-containing compound having a structure as shown in Formula I:
[0009]
[0010] Formula I
[0011] In Formula I, X is selected from Si or C;
[0012] Y1 and Y2 may exist independently or not, and if Y1 or Y2 exists, it is selected from single bond, O or S;
[0013] R1 is selected from H, D, F, cyano, trimethylsilyl, substituted or unsubstituted C6~C. 30 Aryl or substituted or unsubstituted C3~C 30 Mixed aromatics;
[0014] When the substituted or unsubstituted group contains a substituent, the substituent is selected from D, F, cyano, C1~C1. 12 Alkyl, C6~C 30 Aryl, C3~C 30 Heteroaryl, trimethylsilyl, or diphenylamino;
[0015] In Formula I, the hydrogen atoms can be independently converted by D, F, cyano, C1~C 12 Alkyl, C6~C 30 Aryl or C3~C 30 Substituted by heteroaryl groups;
[0016] Furthermore, the carbazole-containing compounds do not include the following structures:
[0017] .
[0018] The following example illustrates the meaning of the statement "Y1 and Y2 may or may not exist independently, and if Y1 or Y2 exists, it is selected from a single bond, O, or S":
[0019] If Y1 exists and Y2 does not exist, the structure is as follows:
[0020]
[0021] Formula IA;
[0022] In Equation IA, Y1, R1, and X have the same defined range as in Equation I;
[0023] If Y2 exists and Y1 does not exist, the structure is as follows:
[0024]
[0025] Formula IB;
[0026] In Equation IB, Y2, R1, and X have the same defined range as in Equation I;
[0027] If both Y1 and Y2 exist, the structure is as follows:
[0028]
[0029] IC;
[0030] In formula IC, Y1, Y2, R1, and X have the same defined range as in formula I;
[0031] If neither Y1 nor Y2 exists, the structure is as follows:
[0032]
[0033] Formula ID;
[0034] In Equation ID, R1 and X have the same range of limitations as in Equation I.
[0035] Preferably, C6~C 30 The aryl group is selected from phenyl, biphenyl, terphenyl or naphthyl.
[0036] Preferably, C3~C 30 The heteroaryl group is selected from benzofuranyl, benzothiazolyl, dibenzofuranyl, dibenzothiazolyl, carbazoleyl, etc. or .
[0037] Preferably, C1~C 12 The alkyl group is selected from methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, n-pentyl, p-pentyl, n-hexyl, or cyclohexyl.
[0038] Preferably, when the substituted or unsubstituted group contains a substituent, the substituent is selected from D or phenyl.
[0039] Preferably, the hydrogen atoms in Formula I can be independently replaced by D or phenyl.
[0040] Preferably, R1 is selected from H, phenyl, carbazolyl, N-phenylcarbazolyl or dibenzofuranyl.
[0041] Preferably, the carbazole-containing compound has the structure shown in Formulas I-1 to I-3:
[0042] ;
[0043] In Equation I-1, Y 11 Y 21 Each is independently selected from a single bond or none exists;
[0044] In Equation I-2, Y 12 Y 22Each is independently selected from a single bond or none exists;
[0045] In Equation I-3, Y 13 Y 23 Each exists or does not exist independently, Y 13 Or Y 23 If it exists, it is selected from single bond, O, or S, and Y 13 Y 23 At least one of them is O or S;
[0046] In Equations I-1 to I-3, R1 has the same defined range as in Equation I;
[0047] The hydrogen atoms in Formulas I-1 to I-3 can be independently converted by D, F, cyano, C1 to C2. 12 Alkyl, C6~C 30 Aryl or C3~C 30 It is replaced by heteroaryl compounds.
[0048] Preferably, the hydrogen atoms in Formulas I-1 to I-3 can each be independently replaced by D or phenyl.
[0049] Preferably, the carbazole-containing compound is selected from any one of compounds 1 to 60:
[0050] .
[0051] This invention lists some specific structural forms of the carbazole-containing compounds, but the carbazole-containing compounds of this invention are not limited to the listed chemical structures. Any structure based on the structure shown in Formula I, where X, Y1, Y2, and R1 satisfy the above-mentioned limiting conditions should be included.
[0052] In a second aspect, the present invention provides an organic electroluminescent device, the organic electroluminescent device comprising a carbazole-containing compound as described in the first aspect.
[0053] Preferably, the organic electroluminescent device includes a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode; the organic layer includes a light-emitting layer; the light-emitting layer includes the carbazole-containing compound.
[0054] Preferably, the light-emitting layer comprises a host material and a dopant material, wherein the host material comprises the carbazole-containing compound.
[0055] Preferably, in the light-emitting layer, the volume percentage of the naphthohydroanthracene compound is 60% to 99.9% (for example, it can be 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 98%, or 99.9%).
[0056] Preferably, in the light-emitting layer, the volume percentage of the dopant material is 0.1% to 40% (e.g., 0.1%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%). This invention does not impose any special restrictions on the specific selection of the dopant material for the light-emitting layer; commonly used dopant materials in the art are applicable.
[0057] Preferably, the light-emitting layer is prepared by vapor deposition.
[0058] Preferably, the organic thin film layer further includes a hole layer, which includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer. The present invention does not impose any special restrictions on the specific material selection for the hole layer; commonly used hole layer materials in the art are applicable.
[0059] Preferably, the organic thin film layer further includes an electronic layer, which includes at least one of an electron injection layer, an electron transport layer, and a hole blocking layer. The present invention does not impose any special restrictions on the specific material selection for the electronic layer; commonly used electronic layer materials in the art are applicable.
[0060] Thirdly, the present invention provides a display device comprising the organic electroluminescent device as described in the second aspect.
[0061] Compared with the prior art, the present invention has the following beneficial effects:
[0062] This invention designs the structure of carbazole-containing compounds, resulting in carbazole-containing compounds with excellent luminescent properties. These compounds can be used to prepare organic electroluminescent devices, especially as the main material of the light-emitting layer in organic electroluminescent devices. They can effectively reduce the driving voltage of organic electroluminescent devices and improve the current efficiency of organic electroluminescent devices. Detailed Implementation
[0063] 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.
[0064] Preparation Example 1
[0065] This embodiment provides a method for synthesizing intermediate 1, the method being as follows:
[0066]
[0067] Under nitrogen protection, 200 mL of dry toluene, 0.1 mol of 7H-benzo[KL]acridine, 0.1 mol of 3-bromo-6-chlorocarbazole, 0.001 mol of Pd(dba)2 (bis(dibenzylacetone)palladium), 4 g of tri-tert-butylphosphine in toluene solution (containing 0.002 mol of tri-tert-butylphosphine), and 0.3 mol of sodium tert-butoxide were added to a 500 mL three-necked flask. The mixture was heated to reflux for 12 h, then cooled to room temperature, water was added to separate the layers, and the organic layer was washed with water until neutral. The solution was dried with magnesium sulfate and subjected to column chromatography. The resulting chromatogram was concentrated to dryness and crystallized with a mixed solvent of toluene and ethanol to obtain intermediate 1.
[0068] Mass spectrometry analysis of intermediate 1 yielded a mass-to-charge ratio (m / z) of 416.1.
[0069] Synthesis Example 1
[0070] This embodiment provides a method for synthesizing compound 1, the method being as follows:
[0071]
[0072] Under nitrogen protection, 200 mL of dry toluene, 0.1 mol of intermediate 1-0, 0.1 mol of 9,9-diphenyl-2-bromofluorene, 0.001 mol of Pd(dba)2 (bis(dibenzylacetone)palladium), 4 g of a toluene solution of tri-tert-butylphosphine (containing 0.002 mol of tri-tert-butylphosphine), and 0.3 mol of sodium tert-butoxide were added to a 500 mL three-necked flask. The mixture was heated to reflux for 12 h, then cooled to room temperature, and water was added to separate the layers. The organic layer was then washed with water until neutral, dried with magnesium sulfate, and subjected to column chromatography. The resulting chromatogram was concentrated to dryness and crystallized with a mixed solvent of toluene and ethanol to obtain compound 1.
[0073] The mass-to-charge ratio (m / z) of compound 1 was measured to be 698.3 by mass spectrometry.
[0074] Synthesis Example 2
[0075] This embodiment provides a method for synthesizing compound 2, the method being as follows:
[0076]
[0077] Referring to Synthesis Example 1, 9,9-diphenyl-2-bromofluorene was replaced with an equimolar amount of 9,9-diphenyl-3-bromofluorene, while other conditions remained unchanged, to obtain Compound 2.
[0078] Compound 2 was analyzed by mass spectrometry, and the mass-to-charge ratio (m / z) was found to be 698.3.
[0079] Synthesis Example 3
[0080] This embodiment provides a method for synthesizing compound 3, the method being as follows:
[0081]
[0082] Following the synthesis method of Synthesis Example 1, 9,9-diphenyl-2-bromofluorene was replaced with an equimolar amount of 2-bromospirofluorene in Synthesis Example 1, while other conditions remained unchanged, to obtain compound 3.
[0083] Mass spectrometry analysis of compound 3: The mass spectrum (m / z) was 696.3.
[0084] Synthesis Example 4
[0085] This embodiment provides a method for synthesizing compound 8, the method being as follows:
[0086]
[0087] Following the synthesis method of Synthesis Example 1, 9,9-diphenyl-2-bromofluorene in Synthesis Example 1 was replaced with an equimolar amount of bromide-1, while keeping other conditions unchanged, to obtain compound 8.
[0088] Mass spectrometry analysis of compound 8: The mass spectrum (m / z) was 712.3.
[0089] Synthesis Example 5
[0090] This embodiment provides a method for synthesizing compound 13, the method being as follows:
[0091]
[0092] Under nitrogen protection, 200 mL of dry toluene, 0.1 mol of intermediate 1, 0.1 mol of carbazole, 0.001 mol of Pd(dba)2 (bis(dibenzylacetone)palladium), 4 g of tri-tert-butylphosphine in toluene solution (containing 0.002 mol of tri-tert-butylphosphine) and 0.3 mol of sodium tert-butoxide were added to a 500 mL three-necked flask. The mixture was heated to reflux for 12 h, then cooled to room temperature, water was added to dissolve the mixture, and the organic layer was washed with water until neutral. The solution was dried with magnesium sulfate and subjected to column chromatography. The resulting chromatogram was concentrated to dryness and crystallized with a mixed solvent of toluene and ethanol to obtain intermediate 13-1.
[0093] Mass spectrometry analysis of intermediate 13-1 yielded a mass-to-charge ratio (m / z) of 547.2.
[0094] Under nitrogen protection, 200 mL of dry toluene, 0.1 mol of intermediate 13-1, 0.1 mol of 9,9-diphenyl-2-bromofluorene, 0.001 mol of Pd(dba)2 (bis(dibenzylacetone)palladium), 4 g of a toluene solution of tri-tert-butylphosphine (containing 0.002 mol of tri-tert-butylphosphine), and 0.3 mol of sodium tert-butoxide were added to a 500 mL three-necked flask. The mixture was heated to reflux for 12 h, then cooled to room temperature, and water was added to separate the layers. The organic layer was then washed with water until neutral, dried with magnesium sulfate, and subjected to column chromatography. The resulting chromatogram was concentrated to dryness and crystallized with a mixed solvent of toluene and ethanol to obtain compound 13.
[0095] Compound 13 was analyzed by mass spectrometry, and the mass-to-charge ratio (m / z) was found to be 863.3.
[0096] Synthesis Example 6
[0097] This embodiment provides a method for synthesizing compound 18, the method being as follows:
[0098]
[0099] Under nitrogen protection, 200 mL of dry toluene, 100 mL of ethanol, 100 mL of water, 0.1 mol of intermediate 1, 0.1 mol of N-phenylcarbazole-3-boric acid, 0.005 mol of tris(dibenzylacetone)palladium, 0.01 mol of 2-dicyclohexylphosphine-2',4',6'-triisopropylbiphenyl, and 0.15 mol of potassium carbonate were added to a 1000 mL three-necked flask. The mixture was heated to 78 °C and refluxed for 6 h. After cooling to room temperature, water was added to separate the contents. The organic layer was then washed with water until neutral, dried with sodium sulfate, and subjected to column chromatography. The resulting chromatogram was concentrated to dryness and recrystallized with a mixed solvent of toluene and ethanol to obtain intermediate 18-1.
[0100] The intermediate 18-1 was analyzed by mass spectrometry, and the mass-to-charge ratio (m / z) was found to be 623.2.
[0101] Under nitrogen protection, 200 mL of dry toluene, 0.1 mol of intermediate 18-1, 0.1 mol of 9,9-diphenyl-2-bromofluorene, 0.001 mol of Pd(dba)2 (bis(dibenzylacetone)palladium), 4 g of a toluene solution of tri-tert-butylphosphine (containing 0.002 mol of tri-tert-butylphosphine), and 0.3 mol of sodium tert-butoxide were added to a 500 mL three-necked flask. The mixture was heated to reflux for 12 h, then cooled to room temperature, and water was added to separate the layers. The organic layer was then washed with water until neutral, dried with magnesium sulfate, and subjected to column chromatography. The resulting chromatogram was concentrated to dryness and recrystallized with a mixed solvent of toluene and ethanol to obtain compound 18.
[0102] The mass-to-charge ratio (m / z) of compound 18 was determined to be 939.4 by mass spectrometry.
[0103] Synthesis Example 7
[0104] This embodiment provides a method for synthesizing compound 30, the method being as follows:
[0105]
[0106] Following the synthesis method of Synthesis Example 5, compound 30 was obtained by replacing N-phenylcarbazole-3-boronic acid in Synthesis Example 5 with an equimolar amount of phenylboronic acid, and replacing 9,9-diphenyl-2-bromofluorene in Synthesis Example 5 with an equimolar amount of 3-bromotetraphenylsilane, while keeping other conditions unchanged.
[0107] The mass-charge ratio (m / z) of compound 30 was measured by mass spectrometry to be 792.3.
[0108] Synthesis Example 8
[0109] This embodiment provides a method for synthesizing compound 32, the method being as follows:
[0110]
[0111] Following the synthesis method of Synthesis Example 4, 9,9-diphenyl-2-bromofluorene in Synthesis Example 4 was replaced with an equimolar amount of 3-bromotetraphenylsilane, while other conditions remained unchanged, to obtain compound 32.
[0112] The mass-charge ratio (m / z) of compound 32 was determined by mass spectrometry to be 881.3.
[0113] Synthesis Example 9
[0114] This embodiment provides a method for synthesizing compound 48, the method being as follows:
[0115]
[0116] Following the synthesis method of Synthesis Example 6, compound 48 was obtained by replacing phenylboronic acid in Synthesis Example 6 with an equimolar amount of dibenzofuran-1-boronic acid, while keeping other conditions unchanged.
[0117] The mass-charge ratio (m / z) of compound 48 was determined by mass spectrometry to be 882.3.
[0118] Synthesis Example 10
[0119] This embodiment provides a method for synthesizing compound 51, the method being as follows:
[0120]
[0121] Following the synthesis method of Synthesis Example 1, 9,9-diphenyl-2-bromofluorene in Synthesis Example 1 was replaced with an equimolar amount of 4-bromotetraphenylsilane, while other conditions remained unchanged, to obtain compound 51.
[0122] The mass-charge ratio (m / z) of compound 51 was measured by mass spectrometry to be 716.3.
[0123] Synthesis Example 11
[0124] This embodiment provides a method for synthesizing compound 53, the method being as follows:
[0125]
[0126] Following the synthesis method of Synthesis Example 5, 9,9-diphenyl-2-bromofluorene in Synthesis Example 5 was replaced with an equimolar amount of 4-bromotetraphenylsilane, while other conditions remained unchanged, to obtain compound 53.
[0127] The mass-charge ratio (m / z) of compound 53 was determined by mass spectrometry to be 881.3.
[0128] Other compounds for which specific synthesis steps are not listed can be prepared using common knowledge in the art, in conjunction with the above examples.
[0129] The specific structures of some of the compounds used in the following device embodiments and device comparative examples are shown below:
[0130] , , , , , .
[0131] In the following device embodiments, the carbazole-containing compound provided by the present invention is selected as the main material of the light-emitting layer in the organic electroluminescent device, and the above-mentioned HTH-1, HTH-2, and HTH-3 are selected as the main materials of the light-emitting layer in the organic electroluminescent device for the device comparison examples.
[0132] Device Example 1
[0133] This embodiment of the device provides an organic electroluminescent device, using compound 1 provided in the synthesis embodiment 1 of the present invention as the main material of the light-emitting layer; and in this embodiment, the light-emitting layer is prepared by vapor deposition.
[0134] The organic electroluminescent device has the following structure:
[0135] ITO / HT (40nm) / Compound 1: D-1 (5%) / TPBI (30nm) / LiF (0.5nm) / Al (150nm).
[0136] The fabrication method of the above-mentioned organic electroluminescent device is as follows:
[0137] The glass substrate coated with an ITO transparent conductive layer (as the anode) was ultrasonically treated in a cleaning agent, then rinsed in deionized water, then ultrasonically degreased in a mixed solvent of acetone and ethanol, then baked in a clean environment until completely dehydrated, cleaned with ultraviolet light and ozone, and bombarded with a low-energy cation beam to improve the surface properties and enhance the binding ability with the hole transport layer.
[0138] The glass substrate was placed in a vacuum chamber and evacuated to a vacuum level of 1×10⁻⁶. -5 ~9×10 -6 Pa, HT is vacuum-deposited on the anode as a hole transport layer at a deposition rate of 0.1 nm / s and a film thickness of 40 nm;
[0139] A light-emitting layer is vacuum-deposited on top of the hole transport layer at a deposition rate of 0.1 nm / s and a film thickness of 30 nm. The main material of the light-emitting layer is compound 1 provided in this invention, and the doping material is D-1. 5% refers to the doping ratio of the doping material, that is, the volume ratio of the main material of the light-emitting layer to the doping material is 95:5.
[0140] TPBI was vacuum-deposited on top of the light-emitting layer as the electron transport layer of the device at a deposition rate of 0.1 nm / s and a film thickness of 30 nm.
[0141] 0.5 nm LiF and 150 nm Al were vacuum-deposited on the electron transport layer as the electron injection layer and cathode, respectively.
[0142] The brightness, driving voltage, current efficiency, and lifetime of the prepared organic electroluminescent device were measured, and the results are shown in Table 1.
[0143] Device Examples 2-11
[0144] Device Examples 2-11 each provide an organic electroluminescent device, which differs from Device Example 1 only in that the main material of the light-emitting layer is different (see Table 1 for details), while other conditions are the same as those in Device Example 1.
[0145] Device Comparison Examples 1-3
[0146] Comparative Examples 1 to 3 each provide an organic electroluminescent device, which differs from Device Example 1 only in that the main material of the light-emitting layer is different (see Table 1 for details), while other conditions are the same as Device Example 1.
[0147] Performance testing
[0148] The driving voltage, current efficiency, and lifetime (LT90) of the OLED devices provided above were tested. LT90 refers to the time required for the brightness to decrease to 90% of its original brightness while maintaining an initial brightness of 1000 nits at a constant current density. Test items included the brightness, driving voltage, and current efficiency of the organic electroluminescent device. The driving voltage, current efficiency, and LT90 data were all based on a brightness of 1000 cd / m². 2 The relative values at different times (based on the test data of HTH-1). The performance test results of organic electroluminescent devices are shown in Table 1 below.
[0149] Table 1
[0150]
[0151] As can be seen from the above, the present invention, through structural design, obtains a compound suitable as the main material of the light-emitting layer. The organic electroluminescent device prepared thereby has a lower driving voltage, higher current efficiency, and longer service life.
[0152] The present invention has been illustrated with the above embodiments to describe the detailed process flow of the present invention. However, the present invention is not limited to the above detailed process flow, that is, it does not mean that the present invention must rely on the above detailed process flow to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.
Claims
1. A carbazole-containing compound, characterized in that, The carbazole-containing compound has the structure shown in Formula I: Formula I In Formula I, X is selected from Si or C; Y1 and Y2 may exist independently or not, and if Y1 or Y2 exists, it is selected from single bond, O or S; R1 is selected from H, D, F, cyano, trimethylsilyl, diphenylamino, substituted or unsubstituted C6~C. 30 Aryl or substituted or unsubstituted C3~C 30 Mixed aromatics; When the substituted or unsubstituted group contains a substituent, the substituent is selected from D, F, cyano, C1~C1. 12 Alkyl, C6~C 30 Aryl, C3~C 30 Heteroaryl, trimethylsilyl, or diphenylamino; In Formula I, the hydrogen atoms can be independently converted by D, F, cyano, C1~C 12 Alkyl, C6~C 30 Aryl or C3~C 30 Substituted by heteroaryl groups; Furthermore, the carbazole-containing compounds do not include the following structures: 。 2. The carbazole-containing compound according to claim 1, characterized in that, The C6~C 30 The aryl group is selected from phenyl, biphenyl, terphenyl, or naphthyl; Preferably, C3~C 30 The heteroaryl group is selected from benzofuranyl, benzothiazolyl, dibenzofuranyl, dibenzothiazolyl, carbazoleyl, etc. or ; Preferably, C1~C 12 The alkyl group is selected from methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, n-pentyl, p-pentyl, n-hexyl, or cyclohexyl.
3. The carbazole-containing compound according to claim 1, characterized in that, When the substituted or unsubstituted group contains a substituent, the substituent is selected from D or phenyl; Preferably, the hydrogen atoms in Formula I can be independently replaced by D or phenyl.
4. The carbazole-containing compound according to claim 1, characterized in that, R1 is selected from H, phenyl, carbazolyl, N-phenylcarbazolyl, or dibenzofuranyl.
5. The carbazole-containing compound according to claim 1, characterized in that, The carbazole-containing compound has the structures shown in Formulas I-1 to I-3: ； In Equation I-1, Y 11 Y 21 Each is independently selected from a single bond or does not exist; In Equation I-2, Y 12 Y 22 Each is independently selected from a single bond or does not exist; In Equation I-3, Y 13 Y 23 Each exists or does not exist independently, Y 13 Or Y 23 If it exists, it is selected from single bond, O, or S, and Y 13 Y 23 At least one of them is O or S; In Equations I-1 to I-3, R1 has the same defined range as in Equation I; The hydrogen atoms in Formulas I-1 to I-3 can be independently converted by D, F, cyano, C1 to C2. 12 Alkyl, C6~C 30 Aryl or C3~C 30 It is replaced by heteroaryl compounds.
6. The carbazole-containing compound according to claim 1, characterized in that, The carbazole-containing compound is selected from any one of compounds 1 to 60: 。 7. An organic electroluminescent device, characterized in that, The organic electroluminescent device includes a carbazole-containing compound as described in any one of claims 1 to 6.
8. The organic electroluminescent device according to claim 7, characterized in that, The organic electroluminescent device includes a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode; the organic layer includes a light-emitting layer; the light-emitting layer includes the carbazole-containing compound.
9. The organic electroluminescent device according to claim 8, characterized in that, The light-emitting layer comprises a host material and a dopant material, wherein the host material comprises the carbazole-containing compound.
10. A display device, characterized in that, The display device includes an organic electroluminescent device as described in any one of claims 7 to 9.