Blue light host material, preparation method and organic electroluminescent device

Abstract

The invention provides a blue light host material, a preparation method and an organic electroluminescent device, the structural general formula of the blue light host material is a chemical formula I. The blue light host material contains anthryl, and the structure of dibenzofuran group / dibenzothiophene condensed tetramethyl substituted cyclohexane is introduced to adjust the steric configuration. Meanwhile, the recombination probability of excitons is improved, so that the luminous efficiency of a device is improved, the service life of the device is prolonged, the rigid anthracene base body has relatively high fluorescence quantum efficiency, and the luminous efficiency of the material is further improved while the material has good thermal stability and film-forming property. Bridging groups and connected substituent types are selectively increased between the two compounds, so that higher electron mobility is obtained, and a device with low driving voltage, excellent luminous efficiency and long service life can be obtained.

Description

Technical Field

[0001] The present invention belongs to the field of organic electroluminescent materials, and relates to a blue light host material, a preparation method and an organic electroluminescent device. Background Art

[0002] An organic electroluminescent device (OLED) converts electrical energy into light by applying electricity to an organic electroluminescent material, and generally includes an anode, a cathode, and an organic layer formed between the two electrodes. For long-term use and high-resolution displays, an OLED with high luminous efficiency and / or long lifespan is required. To improve luminous efficiency, driving voltage, and / or lifespan, various materials or concepts for the organic layer of an organic electroluminescent device have been proposed, but they are not satisfactory in actual use.

[0003] Among numerous luminescent matrix materials, anthracene emits pure blue light. Due to its large planar conjugated structure, it has advantages such as high fluorescence quantum efficiency, strong carrier mobility and charge injection ability, and high thermal stability, becoming a research hotspot in the field of organic optoelectronics. However, precisely due to this large planar configuration, strong π-π stacking is extremely likely to form between molecules, reducing the efficiency of the originally excellent blue light material, causing the emission wavelength to redshift and the color purity to decrease, which limits its application in solid-state luminescence. To solve this problem, it is necessary to modify its molecules and introduce large substituents on its periphery to increase the distance between chromophores, thereby suppressing intermolecular stacking and improving the luminescence performance of the material.

[0004] Therefore, designing and synthesizing new anthracene-based materials with more excellent performance is a problem to be solved in this field. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a blue light host material, a preparation method and an organic electroluminescent device. The blue light host material of the present invention contains an anthracene group and introduces a structure of dibenzofuran group / dibenzothiophene-fused tetramethyl-substituted cyclohexane, which can adjust the spatial configuration and simultaneously increase the recombination probability of excitons, thereby improving the luminous efficiency and service life of the device. The rigid anthracene group itself has a high fluorescence quantum efficiency, enabling the material to have good thermal stability and film-forming properties while further improving the luminous efficiency of the material. By selectively increasing the types of bridging groups and connecting substituents between the two, a higher electron mobility can be obtained, and thus a device with a low driving voltage, excellent luminous efficiency and service life can be obtained.

[0006] To achieve the purpose of this invention, the following technical solutions are adopted by the present invention:

[0007] On the one hand, the present invention provides a blue light host material, and the structural general formula of the blue light host material is Chemical Formula I:

[0008]

[0009] In Chemical Formula I:

[0010] X is independently selected from O or S;

[0011] L is selected from a single bond, a substituted or unsubstituted C6-C30 arylene group;

[0012] Y1, Y2, and Y3 are each independently selected from C or N, and at most one of Y1, Y2, and Y3 is N, and the rest are C;

[0013] Each R1 is independently selected from a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C5-C30 heteroaryl group, and at least one of its heteroatoms contains at least one of O, S, N, Si, and Se;

[0014] Each of R2 and R3 is independently selected from hydrogen, deuterium, cyano, a substituted or unsubstituted C1-C20 alkyl group, a substituted or unsubstituted C3-C20 cycloalkyl group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C5-C30 heteroaryl group, and at least one of its heteroatoms contains at least one of O, S, N, Si, and Se;

[0015] n2 is an integer selected from 0-8 (for example, 0, 1, 2, 3, 4, 5, 6, 7, 8);

[0016] n3 is an integer selected from 0-3 (for example, 0, 1, 2, 3);

[0017] The hydrogen in Chemical Formula I is either all unsubstituted by deuterium, partially substituted by deuterium, or all substituted by deuterium.

[0018] Further preferably, L is selected from a single bond, a substituted or unsubstituted C6-C18 arylene group.

[0019] Further preferably, each R1 is independently selected from a substituted or unsubstituted C6-C25 aryl group, a substituted or unsubstituted C5-C25 heteroaryl group, and at least one of its heteroatoms contains at least one of O, S, N, Si, and Se.

[0020] Further preferably, each of R2 and R3 is independently selected from hydrogen, deuterium, cyano, a substituted or unsubstituted C1-C6 alkyl group, a substituted or unsubstituted C3-C7 cycloalkyl group, a substituted or unsubstituted C6-C18 aryl group, a substituted or unsubstituted C5-C12 heteroaryl group, and at least one of its heteroatoms contains at least one of O, S, N, Si, and Se.

[0021] Even more preferably, L is independently selected from a single bond, phenylene, naphthylene, biphenylene.

[0022] More preferably, R1 is independently selected from phenyl, biphenyl, naphthyl, terphenyl, anthryl, phenanthryl, pyridyl, pyrimidinyl, triazinyl, quinolinyl, quinoxalinyl, 9,9-dimethylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazolyl, benzocarbazolyl, methylphenyl, phenylnaphthyl, cyanophenyl, cyanopyridyl, phenylpyridyl, methylpyridyl, methylpyrimidinyl and any combination thereof.

[0023] More preferably, each of R2 and R3 is independently selected from hydrogen, deuterium, cyano, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, isobutyl, cyclobutane, cyclopentane, cyclohexane, phenyl, biphenyl, naphthyl, terphenyl, anthryl, phenanthryl, pyridyl, pyrimidinyl, triazinyl, quinolinyl, quinoxalinyl, 9,9-dimethylfluorenyl, spirobifluorenyl, dibenzofuranyl, dibenzothiophenyl, benzonaphthofuranyl, benzonaphthothiophenyl, benzonaphthofluorenyl, carbazolyl, benzocarbazolyl, methylphenyl, phenylnaphthyl, cyanophenyl, cyanopyridyl, phenylpyridyl, phenyldibenzofuranyl, phenyldibenzothiophenyl, phenyldimethylfluorenyl, phenylcarbazolyl, methylpyridyl, methylpyrimidinyl and any combination thereof;

[0024] In the present invention, the term "substituted" means substituted with one, two or more substituents selected from the following: deuterium, halogen group, cyano, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, cyclopentane, cyclohexane, trifluoromethyl, 1-methylbutyl, 1-ethylbutyl, pentyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, 1-methylhexyl, phenyl, biphenyl, naphthyl, fluorenyl, dimethylfluorenyl, phenanthryl, anthryl, indenyl, triphenylenyl, pyrenyl, group, furanyl, thiophenyl, pyrrolyl, pyridyl, benzofuranyl, benzothiophenyl, isobenzofuranyl, dibenzofuranyl, dibenzothiophenyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazolyl, benzoxazolyl, isoindolyl, indolyl, benzindolyl, indazolyl, benzothiadiazolyl, carbazolyl, benzocarbazolyl, adamantyl.

[0025] Furthermore, among the above blue light host materials, any one selected from the compounds represented by the following structural formulas:

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033] The compounds of the present invention can be prepared by synthetic methods known to those skilled in the art, or preferably, the following reaction process is used for preparation.

[0034]

[0035] In the above formulas, X, L, Y1 - Y3, R1 - R3, n2, n3 are as defined in the above chemical formula I; Hal1 and Hal2 independently represent Br or Cl.

[0036] Compared with the complex raw materials that are not disclosed, classical Suzuki coupling reaction, borylation reaction, etc. will be used for synthesis and applied to the present invention.

[0037] Step 1 specifically includes the following process:

[0038] Raw material A (1.0 eq), bis(pinacolato)diboron (1.0 - 2.0 eq) and potassium acetate (2.0 - 4.0 eq) are added to a reaction flask, then 1,4 - dioxane is added, and tris(dibenzylideneacetone)dipalladium(0) (0.02 - 0.10 eq) and X - Phos (0.1 - 0.2 eq) are added under nitrogen protection. The temperature is raised to 110 - 120 °C and refluxed for 4 - 24 h; the reaction is detected by thin - layer chromatography. After the reaction is completed, the temperature is slightly lowered, dichloromethane and water are added for extraction and liquid separation, and the organic phase is retained and concentrated. The intermediate 1 is purified by column chromatography using a mixed solution of dichloromethane and petroleum ether (V:V = 1:3 - 1:8).

[0039] Step 2 specifically includes the following process:

[0040] Intermediate 1 (1.0 eq) and raw material B (1.0 - 1.3 eq) were added into a reaction flask, and then a mixed solution of toluene, ethanol, and water (V:V:V = 3:1:1) was added. Under nitrogen protection, tetrakis(triphenylphosphine)palladium (0.01 - 0.03 eq) and potassium carbonate (2.0 - 4.0 eq) or palladium acetate (0.02 - 0.06 eq), X-Phos (2-dicyclohexylphosphino-2,4,6-triisopropylbiphenyl, 0.1 - 0.3 eq), and cesium carbonate (2.0 - 4.0 eq) were added. The temperature was raised to 85°C - 95°C, and the mixture was refluxed for 2 - 24 h. The reaction was monitored by thin-layer chromatography. After the reaction was completed, the temperature was slightly lowered, and dichloromethane and water were added for extraction and liquid separation. The organic phase was retained and concentrated, and purified by column chromatography using a mixed solution of dichloromethane and petroleum ether (V:V = 1:3 - 1:8) to obtain Chemical Formula I.

[0041] On the other hand, the present invention provides an organic electroluminescent device, which includes a first electrode, a second electrode, and at least one organic layer disposed between the first electrode and the second electrode. The organic layer contains the blue light host material as described above.

[0042] Preferably, the organic layer includes a light-emitting layer, and the light-emitting layer includes the blue light host material as described above.

[0043] Preferably, the organic layer further includes at least one of a hole injection layer, a hole transport layer, a light-emitting auxiliary layer, a hole blocking layer, an electron transport layer, or an electron injection layer.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The blue light host material of the present invention has a rigid anthracene group and a structure of dibenzo-fused tetramethyl-substituted cyclohexane containing heteroatoms (O, S) as the main core. The lone pair electrons of the heteroatoms on the dibenzo ring structure can form conjugation with the plane, thereby enhancing the conjugation degree of the structure, having high mobility, and being beneficial to reducing the device voltage. Introducing tetramethyl-substituted cyclohexane on the dibenzo ring structure can adjust the spatial configuration, provide a better shielding effect, reduce the influence of the external environment on the core skeleton, improve the film-forming property of the material, and enhance the device stability, thereby improving the service life of the device. And it makes the band gap of the material larger, enhancing the exciton blocking ability, so that the exciton recombination probability can be increased, which is beneficial to improving the device luminescence efficiency.

[0046] In addition, the anthracene group has a high fluorescence quantum efficiency, especially in the blue light region. Its rigid planar structure reduces the possibility of non-radiative transitions, effectively improving the electron mobility, thereby enhancing the luminescence efficiency of blue light. Its lowest unoccupied molecular orbital (LUMO) energy level is relatively low, which is conducive to the injection and transport of electrons. The structure of the anthracene group is relatively stable and can withstand relatively high temperatures, making its structure less likely to change during the evaporation process, thus extending the service life of its devices. In addition, the anthracene group also has a wide bandgap, which enables it to have strong absorption and emission capabilities in the blue light region.

[0047] A bridging group L (phenylene, biphenylene, naphthylene) can also be introduced between the anthracene group and the structure of dibenzo-fused five-membered ring tetramethyl-substituted cyclohexane containing heteroatoms (O, S), which can reduce the appearance of large planar surfaces within the molecule, weaken the intermolecular interactions, extend the device life, and also play a buffering role, making the system extended, enhancing the electron fluidity, increasing the mobility faster, reducing the voltage, and improving the luminescence efficiency. Description of the Drawings

[0048] Figure 1 It is the nuclear magnetic resonance hydrogen spectrum of Compound 1 provided in Example 1 of the present invention. Detailed Embodiments

[0049] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0050] In addition, it should be noted that the values given in the following embodiments are as accurate as possible. However, those skilled in the art understand that due to inevitable measurement errors and experimental operation problems, each number should be understood as an approximate number rather than an absolutely accurate value.

[0051] Example 1

[0052]

[0053] Step 1 specifically includes the following processes:

[0054] Add raw material A-1 (1.0 eq, CAS No.: 3025110-19-1), bis(pinacolato)diboron (1.3 eq) and potassium acetate (4.0 eq) into a reaction flask, then add 1,4-dioxane. Under nitrogen protection, add tris(dibenzylideneacetone)dipalladium(0) (0.04 eq) and X-Phos (0.2 eq), heat up to 120 °C, and reflux for 18 h. Detect the reaction by thin-layer chromatography. After the reaction is completed, slightly lower the temperature, add dichloromethane and water for extraction and liquid separation. Retain the organic phase and concentrate it. Purify it by column chromatography using a mixed solution of dichloromethane and petroleum ether (V:V = 1:4) to obtain intermediate 1 (yield: 78.4%).

[0055] Step 2 specifically includes the following process:

[0056] Add intermediate 1 (1.0 eq) and raw material B-1 (1.0 eq, CAS No.: 3057522-16-1) into a reaction flask, then add a mixed solution of toluene, ethanol and water (V:V:V = 3:1:1). Under nitrogen protection, add tetrakis(triphenylphosphine)palladium(0) (0.03 eq) and potassium carbonate (4.0 eq), heat up to 95 °C, and reflux for 12 h. Detect the reaction by thin-layer chromatography. After the reaction is completed, slightly lower the temperature, add dichloromethane and water for extraction and liquid separation. Retain the organic phase and concentrate it. Purify it by column chromatography using a mixed solution of dichloromethane and petroleum ether (V:V = 1:4) to obtain compound 1 (yield: 81.5%).

[0057] Detect and analyze the obtained compound 1, and the results are as follows:

[0058] HPLC purity: >99.8%.

[0059] Mass spectrometry test: A mass spectrometer of model Waters XEVO TQD, using ESI source.

[0060] Test value ((ESI, m / Z): [M+H] + ) : 552.50.

[0061] Elemental analysis:

[0062] Calculated value: C, 91.27; H, 5.84; O, 2.89;

[0063] Test value: C, 91.00; H, 5.98; O, 3.04.

[0064] The 1H NMR spectrum of compound 1 is as Figure 1 shown.

[0065] Example 2

[0066]

[0067] Step 1 specifically includes the following process:

[0068] Add raw material A-133 (1.0 eq, CAS No.: 3025110-22-6), bis(pinacolato)diboron (1.3 eq) and potassium acetate (4.0 eq) into a reaction flask, then add 1,4-dioxane. Under nitrogen protection, add tris(dibenzylideneacetone)dipalladium(0) (0.04 eq) and X-Phos (0.2 eq), heat up to 120 °C, and reflux for 16 h; detect the reaction by thin-layer chromatography. After the reaction is completed, slightly lower the temperature, add dichloromethane and water for extraction and liquid separation. After retaining the organic phase, concentrate it, and purify it by column chromatography using a mixed solution of dichloromethane and petroleum ether (V:V = 1:4) to obtain intermediate 1 (yield: 78.8%).

[0069] Step 2 specifically includes the following process:

[0070] Add intermediate 1 (1.0 eq) and raw material B-133 (1.0 eq, CAS No.: 60339-90-4) into a reaction flask, then add a mixed solution of toluene, ethanol and water (V:V:V = 3:1:1). Under nitrogen protection, add palladium acetate (0.05 eq), X-Phos (0.2 eq) and cesium carbonate (4.0 eq), heat up to 95 °C, and reflux for 11 h; detect the reaction by thin-layer chromatography. After the reaction is completed, slightly lower the temperature, add dichloromethane and water for extraction and liquid separation. After retaining the organic phase, concentrate it, and purify it by column chromatography using a mixed solution of dichloromethane and petroleum ether (V:V = 1:5) to obtain compound 133 (yield: 80.9%).

[0071] Detect and analyze the obtained compound 133, and the results are as follows:

[0072] HPLC purity: >99.7%.

[0073] Mass spectrometry test: A mass spectrometer of model Waters XEVO TQD, using ESI source.

[0074] Test value ((ESI, m / Z): [M+H] + ): 594.48.

[0075] Elemental analysis:

[0076] Calculated value: C, 88.85; H, 5.76; S, 5.39;

[0077] Test value: C, 88.59; H, 5.91; S, 5.53.

[0078] In addition, other compounds of the present invention can be obtained by referring to the synthesis methods of the above-listed embodiments, so they will not be listed one by one here.

[0079] Device Example 1: Preparation of Organic Electroluminescent Device

[0080] The structure of the prepared OLED device is: ITO anode / HIL / HTL / Prime / EML / HBL / ETL / EIL / cathode / CPL.

[0081] a. ITO anode: The ITO (indium tin oxide)-Ag-ITO (indium tin oxide) glass substrate with a coating thickness of was washed twice in distilled water, ultrasonically washed for 30 min, then repeatedly washed twice with distilled water, ultrasonically washed for 10 min. After the washing was completed, it was ultrasonically washed with methanol, acetone, and isopropanol in sequence (each washing for 5 min), dried, then transferred to a plasma cleaner for washing for 5 min, and then sent to an evaporation coater. Using this substrate as the anode, other functional layers were evaporated on it in sequence.

[0082] b. HIL (hole injection layer): At a evaporation rate, the hole injection layer materials HT and P-dopant were vacuum-evaporated. The evaporation rate ratio of HT and P-dopant was 97:3, and the thickness was 10 nm.

[0083] c. HTL (hole transport layer): At a evaporation rate, 130 nm of HT was vacuum-evaporated on the hole injection layer as the hole transport layer.

[0084] d. Prime (luminescence assisting layer): At a evaporation rate, 5 nm of Prime was vacuum-evaporated on the hole transport layer as the luminescence assisting layer.

[0085] e. EML (emitting layer): Then, on the above luminescence assisting layer, at a evaporation rate, a host material with a thickness of 30 nm (compound 1 provided in the above embodiment as the host material) and a doping material (Dopant) were vacuum-evaporated as the emitting layer. The evaporation rate ratio of the host compound and Dopant was 98:2, and the chemical formula of Dopant is shown as follows.

[0086] f. HBL (hole blocking layer): At a evaporation rate, a hole blocking layer HB with a thickness of 5 nm was vacuum-evaporated.

[0087] g. ETL (electron transport layer): At a The evaporation rate is such that a vacuum-evaporated thickness of 30 nm of ET and Liq is used as the electron transport layer. The evaporation rate ratio of ET and Liq is 50:50.

[0088] h, EIL (electron injection layer): At the evaporation rate, a 1-nm Yb film layer is evaporated to form the electron injection layer.

[0089] i, cathode: At the evaporation rate ratio, 13 nm of magnesium and silver are evaporated, and the evaporation rate ratio is 1:9 to obtain the OLED device.

[0090] j, CPL (cover layer): At the evaporation rate, a 70-nm CPL is vacuum-evaporated on the cathode as the cover layer.

[0091] k. Subsequently, the evaporated substrate is encapsulated. First, a coating device is used to coat the cleaned cover plate with UV glue, then the coated cover plate is moved to the lamination section, the evaporated substrate is placed on top of the cover plate, and finally the substrate and the cover plate are laminated under the action of a laminating device, and at the same time, the UV glue is photocured.

[0092] The structural formulas of HT, P-dopant, Prime, Dopant, HB, ET, and CPL used in the above Device Example 1 are as follows:

[0093]

[0094] Referring to the method provided in the above Device Example 1, the corresponding compounds in Table 1 are respectively selected to replace Compound 1 for the evaporation of the host material, and the corresponding organic electroluminescent devices are prepared, which are respectively denoted as Device Examples 2 - 34.

[0095] Device Comparative Examples 1 - 7:

[0096] This comparative example provides an organic electroluminescent device. The only difference between the preparation method of this organic electroluminescent device and that of Device Example 1 is that this organic electroluminescent device uses the existing comparative compounds a - g to replace Compound 1 in the above Device Example 1 as the host material for evaporation. Among them, the chemical structural formulas of the comparative compounds a - g are as follows:

[0097]

[0098] The driving voltage, BI value, and lifetime of the organic electroluminescent devices obtained in the above Device Examples 1 - 34 and Device Comparative Examples 1 - 7 are characterized at a brightness of 1000 (nits), and the test results are shown in Table 1 below.

[0099] Table 1 Device Test Results

[0100]

[0101]

[0102] Those skilled in the art know that in a blue top-emitting device, the luminous efficiency is greatly affected by chromaticity. Therefore, considering the influencing factors of chromaticity on efficiency, the luminous efficiency is defined as the BI value in relation to the CIEy ratio, that is, BI = (cd / A) / CIEy. During the test, the range of the CIEy value is adjusted between 0.043 - 0.045.

[0103] It can be seen from the test data in Table 1 that the organic electroluminescent device prepared using the compound of the present invention as the host material of the light-emitting layer has a low driving voltage, excellent luminous efficiency, and a long service life.

[0104]

[0105] Comparative compounds c, d, e and compounds 23, 91, 120 are parallel comparative examples respectively. The difference is that the structural cores of comparative compounds c, d, e are phenanthrofuran groups or phenanthrothiophene groups, while the structural cores of the compounds 23, 91, 120 of the present invention are cyclohexanes with tetramethyl substitution introduced on a dibenzo five-membered ring containing heteroatoms (O, S) (which can be regarded as a phenanthrofuran group or a phenanthrothiophene group connected with four methyl groups). The introduced tetramethyl substitution can adjust the spatial configuration, provide a better shielding effect, reduce the influence of the external environment on the core skeleton, improve the film-forming property of the material, enhance the device stability, thereby enhancing the device life, and making the band gap of the material larger, enhancing the exciton blocking ability, so that the exciton recombination probability can be increased, which is beneficial to improving the device efficiency.

[0106] The applicant declares that the present invention uses the above embodiments to illustrate the blue light host material, preparation method and organic electroluminescent device of the present invention, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent substitution of the raw materials selected for the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A blue light host material, characterized in that: The general structural formula of the blue light host material is Chemical Formula I: In the chemical formula I: X is independently selected from O or S; L is selected from a single bond, a substituted or unsubstituted C6-C30 arylene group; Y1, Y2, and Y3 are each independently selected from C or N, and Y1, Y2, and Y3 have at most one N, and the rest are C; R1 is independently selected from a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C5-C30 heteroaryl group, and its heteroatom contains at least one of O, S, N, Si, and Se; R2 and R3 are each independently selected from one of hydrogen, deuterium, cyano, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, and the heteroatom thereof contains at least one of O, S, N, Si, and Se; n2 is an integer selected from 0 to 8; n3 is an integer selected from 0 to 3; The hydrogen in Formula I is not completely substituted by deuterium, is partially substituted by deuterium, or is completely substituted by deuterium.

2. The blue light host material according to claim 1, characterized in that: L is selected from a single bond, a substituted or unsubstituted arylene group having C6-C18.

3. The blue light host material according to claim 1, characterized in that: R1 is independently selected from a substituted or unsubstituted C6-C25 aryl group, a substituted or unsubstituted C5-C25 heteroaryl group, and its heteroatom contains at least one of O, S, N, Si, and Se.

4. The blue light host material according to claim 1, characterized in that: R2 and R3 are each independently selected from one of hydrogen, deuterium, cyanide, substituted or unsubstituted C1-C6 alkyl, substituted or unsubstituted C3-C7 cycloalkyl, substituted or unsubstituted C6-C18 aryl, substituted or unsubstituted C5-C12 heteroaryl, and their heteroatoms contain at least one of O, S, N, Si, and Se.

5. The blue light host material according to claim 1, characterized in that: L is independently selected from a single bond, phenylene, naphthylene, biphenylene; R1 is independently selected from phenyl, biphenyl, naphthyl, terphenyl, anthracenyl, phenanthryl, pyridyl, pyrimidyl, triazine, quinolyl, quinoxalinyl, 9,9-dimethylfluorenyl, dibenzofuranyl, dibenzothiophenyl, carbazolyl, benzocarbazolyl, methylphenyl, phenylnaphthyl, cyanophenyl, cyanopyridyl, phenylpyridyl, methylpyridyl, methylpyrimidyl and any combination thereof; R2 and R3 are each independently selected from hydrogen, deuterium, cyano, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, isobutyl, cyclobutane, cyclopentane, cyclohexane, phenyl, biphenyl, naphthyl, terphenyl, anthracenyl, phenanthryl, pyridyl, pyrimidyl, triazine, quinolyl, quinoxalinyl, 9,9-dimethylfluorenyl, spirobifluorenyl, dibenzofuranyl, dibenzothiophenyl, benzonaphthofuranyl, benzonaphthothiophenyl, benzonaphthofluorenyl, carbazolyl, benzocarbazolyl, methylphenyl, phenylnaphthyl, cyanophenyl, cyanopyridyl, phenylpyridyl, phenyldibenzofuranyl, phenyldibenzothiophenyl, phenyldimethylfluorenyl, phenylcarbazolyl, methylpyridyl, methylpyrimidinyl and any combination thereof.

6. The blue light host material according to claim 1, characterized in that: The substituents in the substituted group are selected from one, two or more of the following substituents: deuterium, halogen, cyano, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, cyclopentane, cyclohexane, trifluoromethyl, 1-methylbutyl, 1-ethylbutyl, pentyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, n-hexyl, 1-methylpentyl, 2-methylpentyl, 4-methyl-2-pentyl, 3,3-dimethylbutyl, 2-ethylbutyl, 1-methylhexyl, phenyl, biphenyl, naphthyl, fluorenyl, dimethylfluorenyl, phenanthrenyl, anthracenyl, indenyl, triphenylene, pyrenyl, yl, furyl, thienyl, pyrrolyl, pyridyl, benzofuranyl, benzothienyl, isobenzofuranyl, dibenzofuranyl, dibenzothienyl, benzimidazolyl, benzothiazolyl, benzisothiazolyl, benzisoxazolyl, benzoxazolyl, isoindolyl, indolyl, benzindolyl, indazolyl, benzothiadiazolyl, carbazolyl, benzocarbazolyl and adamantyl.

7. The blue light host material according to claim 1, characterized in that: The blue light host material is selected from any one of the following compounds:

8. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises a first electrode, a second electrode and at least one organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises the blue light host material according to any one of claims 1 to 7.

9. The organic electroluminescent device according to claim 8, characterized in that: The organic layer includes a light-emitting layer, and the light-emitting layer includes the blue light host material according to any one of claims 1 to 7.

10. The organic electroluminescent device according to claim 9, characterized in that: The organic layer further includes at least one of a hole injection layer, a hole transport layer, a light-emitting auxiliary layer, a hole blocking layer, an electron transport layer or an electron injection layer.

Images