Blue light-emitting compound containing cyclohexyl dibenzofuran structure and organic electroluminescent device containing blue light-emitting compound

Abstract

The invention discloses a blue light-emitting compound containing a cyclohexyldibenzofuran structure and an organic electroluminescent device containing the blue light-emitting compound. The structural general formula of the blue light-emitting compound is shown as a formula I or a formula II, and Ar1 represents cyclohexyl dibenzofuranyl. A cyclohexyldibenzofuran group is introduced into a compound structure, so that under the mutual repulsion effect of oxygen atom lone pair electrons, the intermolecular distance is increased, the fluorescence quantum yield is improved, the efficiency of a device is improved, and the service life of the device is prolonged. Besides, the compound is good in thermal stability, and the rigidity of the compound is enhanced, so that the problem of device performance degradation caused by heating is indirectly reduced, the efficiency of the device is further improved, and the service life of the device is further prolonged. # imgabs0 # I; and # imgabs1 # II.

Description

Technical Field

[0001] The invention belongs to the technical field of OLED, and specifically comprises a blue light-emitting compound containing a cyclohexyldibenzofuran structure and an organic electroluminescent device containing the same. Background Art

[0002] Since Academician Tang Benzhong and his research team first discovered the phenomenon of aggregation-induced emission in 2001, people have become very interested in this unique phenomenon. Compared with traditional display technology, OLED has the advantages of self-luminescence, wide viewing angle, high brightness, high contrast, low power consumption, low driving voltage, flexible display, and fast response speed. With the progress of the times and the continuous innovation of Internet technology, the OLED industry, as an indispensable smart port, is about to usher in a broad growth space.

[0003] OLED devices can be divided into fluorescent luminescence, phosphorescent luminescence, thermally excited delayed fluorescence and thermally excited sensitized fluorescence according to the luminescence mechanism. At present, the research on the active layer of OLED is mainly focused on fluorescent materials, and the internal quantum efficiency of fluorescent materials (the ratio of the number of radiated photons inside the device to the number of injected carriers) is up to 25%. This is because the ratio of singlet and triplet states generated under electroexcitation conditions is 1:3, so only 25% of singlet excitons undergo radiative transitions, while triplet excitons undergo non-radiative decay due to spin prohibition. Among OLED fluorescent materials, blue light materials have the advantages of low driving voltage, slow decay, high repeatability and color purity adjustability. Therefore, the development of OLED blue light materials with high efficiency, long life and good thermal stability and the research of related devices have become a difficult problem in the current OLED research field.

[0004] The thermal stability of OLED is a key factor affecting its service life and performance, especially in high temperature environments, where efficiency attenuation, metal migration, and material aging are prone to occur. In previous studies, it was found that by introducing dibenzofuran substituents into the guest material, the electron cloud density of the compound can be increased. The rigid dibenzofuran structure is conducive to enhancing the structural stability of the compound and improving the efficiency of the device. As people's research continues to deepen, in order to further improve the efficiency and life of OLED devices, people have tried to introduce other substituents next to dibenzofuran. For example, by introducing tetramethylcyclohexyl, the electron cloud density of the dibenzofuran core is increased. However, due to the excessive number of methyl groups, the molecules are stacked tightly, which is not conducive to the thermal stability of the guest material, and ultimately the improvement of device efficiency and life does not achieve the expected effect. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention provides a blue light-emitting compound containing a cyclohexyldibenzofuran structure and an organic electroluminescent device containing the same.

[0006] To achieve the above objectives, the technical solutions adopted by the present invention include: The first aspect of the present invention provides a blue light-emitting compound containing a cyclohexyl dibenzofuran structure, wherein the general structural formula of the blue light-emitting compound is as shown in Formula I or Formula II: I; II; in, X represents O or S; Ar1 represents a cyclohexyldibenzofuranyl group; Ar2 represents any one of a substituted or unsubstituted aryl group having C6 to C60 carbon atoms, a substituted or unsubstituted heteroaryl group having C5 to C60 carbon atoms, a substituted or unsubstituted condensed ring aryl group having C6 to C60 carbon atoms, and a substituted or unsubstituted heterocondensed ring aryl group having C5 to C60 carbon atoms; L represents a single bond, or a substituted or unsubstituted arylene group having carbon atoms of C6 to C12; R1, R2, and R3 each independently represent any one of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having C1 to C30 carbon atoms, substituted or unsubstituted alkenyl having C2 to C30 carbon atoms, substituted or unsubstituted cycloalkyl having C3 to C30 carbon atoms, substituted or unsubstituted aryl having C6 to C60 carbon atoms, substituted or unsubstituted heteroaryl having C5 to C60 carbon atoms, substituted or unsubstituted condensed ring aryl having C6 to C60 carbon atoms, and substituted or unsubstituted heterocondensed ring aryl having C5 to C60 carbon atoms, wherein two or more R1, R2, and R3 may be connected to each other to form an aliphatic ring, an aromatic ring, or a condensed ring; When Ar2, R1, R2, and R3 contain a substituent, the substituent is selected from any one of an alkyl group having carbon atoms of C1 to C10, a cycloalkyl group having carbon atoms of C3 to C10, an aryl group having carbon atoms of C6 to C20, and a substituted or unsubstituted heteroaryl group having carbon atoms of C5 to C20; m and p each independently represent 0, 1, 2, 3 or 4, and n represents 0, 1, 2 or 3; In Formula I and Formula II, any hydrogen can be replaced by deuterium, any nitrogen can be replaced by nitrogen-15, any sulfur can be replaced by sulfur-33, sulfur-34 or sulfur-36, any oxygen can be replaced by oxygen-17 or oxygen-18, any carbon can be replaced by carbon-13, and any boron can be replaced by boron-11.

[0007] Further, the X represents O; The above-mentioned L represents any one of a single bond, a substituted or unsubstituted phenylene group, and a substituted or unsubstituted naphthylene group.

[0008] Further, Ar1 represents one of the following structures: , , .

[0009] Furthermore, the general structural formula of the blue light-emitting compound is shown in one of Formula I-1 to Formula I-5: I-1, I-2, I-3, I-4, I-5.

[0010] Further, R1, R2, and R3 each independently represent any one of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having C1 to C10 carbon atoms, substituted or unsubstituted cycloalkyl having C3 to C10 carbon atoms, substituted or unsubstituted aryl having C6 to C20 carbon atoms, substituted or unsubstituted heteroaryl having C5 to C20 carbon atoms, substituted or unsubstituted condensed ring aryl having C6 to C20 carbon atoms, and substituted or unsubstituted heterocondensed ring aryl having C5 to C20 carbon atoms, wherein two or more R1, R2, and R3 may be connected to each other to form a five-membered ring or a six-membered ring; Ar2 represents any one of a substituted or unsubstituted aryl group having C6 to C20 carbon atoms, a substituted or unsubstituted heteroaryl group having C5 to C20 carbon atoms, a substituted or unsubstituted condensed ring aryl group having C6 to C20 carbon atoms, and a substituted or unsubstituted heterocondensed ring aryl group having C5 to C20 carbon atoms.

[0011] Furthermore, R1 and R2 each independently represent , , , , , Any one of .

[0012] Further, the L represents , , , Any one of .

[0013] Further, Ar2 represents one of the following structures: , ; R4 represents any one of an alkyl group having carbon atoms of C1 to C10 and a cycloalkyl group having carbon atoms of C3 to C10; R5 represents a single substituent to the maximum permissible substituent, and is selected from any one of H, an alkyl group having C1 to C10 carbon atoms, and a cycloalkyl group having C3 to C10 carbon atoms.

[0014] In the present invention, as an example, the alkyl group can be arbitrarily selected from one of methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, etc.; As an example, the alkenyl group may be arbitrarily selected from one of vinyl, propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-butadienyl, 1-methylvinyl, etc.; As an example, the cycloalkyl group can be arbitrarily selected from one of cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, etc.; As an example, the aryl group may be arbitrarily selected from one of phenyl, biphenyl, terphenyl, o-tolyl, m-tolyl, p-tolyl, etc.; As an example, the heteroaryl group can be arbitrarily selected from dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indole, carbazole, pyridine, indole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indazine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isox ... Quinoline, cinnoline, quinazoline, quinoxaline, naphthyridine, phthalazine, pteridine, xanthene, acridine, phenazine, phenothiazine, benzofuranopyridine, furanodipyridine, benzothienopyridine, thienodipyridine, benzoselenophenopyridine, selenobenzodipyridine, preferably one of dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and aza analogs thereof; As an example, the condensed ring aromatic group can be arbitrarily selected from one of naphthyl, anthracenyl, phenanthrenyl, pyrenyl, etc.; As an example, the heterocyclic aryl group can be arbitrarily selected from nitrogen-containing heterocyclic aryl groups such as indolyl, quinolyl, and purinyl, oxygen-containing heterocyclic aryl groups such as benzofuranyl, and sulfur-containing heterocyclic aryl groups such as benzothienyl and thienopyridinyl.

[0015] Furthermore, the blue light-emitting compound is selected from one of the following structures:

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046] .

[0047] The second object of the present invention is to provide an organic electroluminescent device, which includes an anode, a hole transport region, a light-emitting layer, an electron transport region, and a cathode arranged in sequence on a substrate; wherein the light-emitting layer includes a host material and a guest material, and the guest material includes one or more blue light-emitting compounds as described above.

[0048] Beneficial effects of the present invention: The blue light-emitting compound provided by the present invention introduces a cyclohexyl dibenzofuran structure. Under the mutual repulsion of the lone pair electrons of the oxygen atom in the cyclohexyl dibenzofuran structure, the distance between molecules is increased, and the fluorescence quantum yield is improved. At the same time, since cyclohexane dibenzofuran is a non-planar structure, the thermal stability and rigidity of the molecule are increased, and the problem of device performance attenuation due to heat is indirectly reduced. Therefore, using the blue light-emitting compound of the present invention as a guest material for the light-emitting layer to prepare an organic electroluminescent device is conducive to obtaining more excellent luminescent performance, a higher BI value and a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic structural diagram of the organic electroluminescent device of the present invention.

[0050] Figure 2 This is the PL spectrum of Synthesis Example 1.

[0051] Figure 3 This is the PL spectrum of Synthesis Example 5.

[0052] Description of the drawings: 1-substrate, 2-anode, 3-hole injection layer, 4-hole transport layer, 5-electron blocking layer, 6-light-emitting layer, 7-hole blocking layer, 8-electron transport layer, 9-electron injection layer, 10-cathode, 11-covering layer. DETAILED DESCRIPTION

[0053] In order to more clearly understand the content of the present invention, it will be described in detail with reference to the drawings and embodiments.

[0054] The organic compound of the present invention is suitable for use in light-emitting elements, display panels and electronic devices, and is particularly suitable for use in organic electroluminescent devices. The electronic device of the present invention is a device comprising a layer of at least one organic compound, and the device may also comprise an inorganic material or a layer formed entirely of an inorganic material. The electronic device is preferably an organic electroluminescent device (OLED). The schematic structural diagram of an exemplary organic electroluminescent device is shown in FIG. Figure 1 shown.

[0055] Experimental Section In order to understand the content of the present invention more clearly, the luminescent characteristics of the organic compound, the preparation method of the organic compound and the device will be explained in detail in conjunction with the examples. Various chemical reactions can be applied to the synthetic method of the compound of one embodiment of the present invention. However, it should be noted that the synthetic method of the compound of one embodiment of the present invention is not limited to the synthetic method described below. Unless otherwise indicated, the subsequent synthesis is carried out in anhydrous solvent under a protective gas atmosphere. Solvents and reagents can be purchased from conventional reagent suppliers.

[0056] Synthesis of compounds Intermediate Synthesis 1 This example provides an intermediate compound P-10, the synthesis route of which is as follows:

[0057] Compound C-1 (50.0 g, 220 mmol), D-1 (38.4 g, 220 mmol), tetrakis(triphenylphosphine)palladium (2.54 g, 2.20 mmol), potassium carbonate (60.72 g, 440 mmol), 1,4-dioxane (400 mL) and deionized water (100 mL) were added to a round-bottom flask replaced with nitrogen, and the temperature was raised to 90 °C under stirring and maintained for 4 h; then the reaction mixture was cooled to room temperature, deionized water (100 mL) and ethyl acetate (500 ml) were added and stirred for 20 min, the organic phase was separated, and the organic phase was dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure to obtain a crude product; the crude product was purified by silica gel column chromatography (dichloromethane / n-heptane as mobile phase) to obtain intermediate E-1: 43.16 g, yield: 80%, MS (m / z) (M+): 277.

[0058] Into a dried and nitrogen-substituted round-bottom flask, add intermediate E-1 (40 g, 145 mmol), potassium carbonate (60 g, 435 mmol) and N-methylpyrrolidone (300 mL), stir at 160 ° C for 2 h under nitrogen protection, remove the solvent under reduced pressure to obtain a crude product, wash the crude product with deionized water and ethanol, dry it, and purify it with silica gel column chromatography (dichloromethane / n-heptane as mobile phase) to obtain intermediate F-1: 29.8 g, yield: 75%, MS (m / z) (M+): 257.

[0059] To a nitrogen-substituted round-bottom flask, add intermediate F-1 (29.8 g, 116 mmol), trimethyl borate (12 g, 116 mmol), and tetrahydrofuran (300 mL). Under nitrogen protection, tert-butyl lithium (92.8 mL, 232 mmol) was added dropwise at -50 °C. The addition was completed within 2 h. The mixture was kept warm for 3 h. Then, 40 mL of 5% hydrochloric acid solution was added. Stirring was continued for 2 h. Tetrahydrofuran was evaporated under reduced pressure. The temperature was lowered to 10 °C to produce a solid precipitate. The solid precipitate was filtered and dried to obtain intermediate G-1: 27.3 g, yield: 88%, MS (m / z) (M+): 267.

[0060] Into a nitrogen-substituted round-bottom flask, add intermediate G-1 (27.3 g, 102 mmol), hydroxylaminesulfonic acid (31.74 g, 306 mmol), sodium hydroxide (6.12 g, 153 mmol), and add 300 mL of a mixed solvent of acetonitrile and water (the volume of acetonitrile is 200 mL, and the volume of water is 100 mL), stir to dissolve at room temperature, stir at room temperature for 4 h to terminate the reaction, and the filtrate is extracted twice with ethyl acetate (200 mL), then dried over anhydrous magnesium sulfate, and the solvent is removed under reduced pressure. After drying, it is purified by silica gel column chromatography (dichloromethane / n-heptane as mobile phase) to obtain intermediate P-10: 14.8 g, yield: 61%, MS (m / z) (M+): 238.

[0061] Intermediate Synthesis 2 This example provides an intermediate compound P-11, the synthesis route of which is as follows:

[0062] Referring to the synthesis method of E-1, the raw material D-1 was replaced with D-11 (38.4 g, 220 mmol) to obtain the intermediate E-11: 41.94 g, yield: 69%, MS (m / z) (M+): 277.

[0063] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-11 (40 g, 145 mmol) to obtain intermediate F-11: 26.2 g, yield: 70.3%, MS (m / z) (M+): 257.

[0064] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-11 (25 g, 97.3 mmol) to obtain the intermediate G-11: 24 g, yield: 93%, MS (m / z) (M+): 267.

[0065] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-11 (24 g, 90.2 mmol) to obtain the intermediate P-11: 14.9 g, yield: 70%, MS (m / z) (M+): 238.

[0066] Intermediate Synthesis 3 This example provides an intermediate compound P-12, the synthesis route of which is as follows:

[0067] Referring to the synthesis method of E-1, the raw material D-1 was replaced with D-12 (38.4 g, 220 mmol) to obtain intermediate E-12: 43.7 g, yield: 72%, MS (m / z) (M+): 277.

[0068] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-12 (40 g, 145 mmol) to obtain intermediate F-12: 28 g, yield: 25 g, yield: 67.1%, MS (m / z) (M+): 257.

[0069] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-12 (25 g, 97.3 mmol) to obtain the intermediate G-12: 22.6 g, yield: 87%, MS (m / z) (M+): 267.

[0070] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-12 (20 g, 75.18 mmol) to obtain the intermediate P-12: 12.83 g, yield: 72%, MS (m / z) (M+): 238.

[0071] Intermediate Synthesis 4 This example provides an intermediate compound P-13, the synthesis route of which is as follows:

[0072] Referring to the synthesis method of E-1, the raw material D-1 was replaced with D-13 (38.4 g, 220 mmol) to obtain intermediate E-13: 30 g, yield: 49.35%, MS (m / z) (M+): 277.

[0073] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-13 (30 g, 108.7 mmol) to obtain intermediate F-13: 20 g, yield: 71.6%, MS (m / z) (M+): 257.

[0074] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-13 (20 g, 77.8 mmol) to obtain intermediate G-13: 17.5 g, yield 84.2%, MS (m / z) (M+): 267.

[0075] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-13 (17.5 g, 65.78 mmol) to obtain the intermediate P-13: 12.3 g, yield: 79%, MS (m / z) (M+): 238.

[0076] Intermediate Synthesis 5 This example provides an intermediate compound P-14, the synthesis route of which is as follows:

[0077] Referring to the synthesis method of E-1, the raw material C-1 was replaced with C-14 (40.0 g, 176 mmol) to obtain intermediate E-14: 27.6 g, yield: 56.8%, MS (m / z) (M+): 277.

[0078] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-14 ((25 g, 90.57 mmol)) to obtain intermediate F-14: 19.9 g, yield: 85.4%, MS (m / z) (M+): 257.

[0079] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-14 (17 g, 66.1 mmol) to obtain intermediate G-14: 16.2 g, yield: 92%, MS (m / z) (M+): 267.

[0080] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-14 (15 g, 56.39 mmol) to obtain the intermediate P-14: 8.9 g, yield: 67%, MS (m / z) (M+): 238.

[0081] Intermediate Synthesis 6 This example provides an intermediate compound P-15, the synthesis route of which is as follows:

[0082] Referring to the synthesis method of E-1, the raw material C-1 was replaced by C-14 (50.0 g, 220 mmol), and D-1 was replaced by D-11 (38.4 g, 220 mmol) to obtain the intermediate E-15: 39.5 g, yield: 65%, MS (m / z) (M+): 277.

[0083] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-15 (39.5 g, 143 mmol) to obtain intermediate F-15: 29.7 g, yield: 81%, MS (m / z) (M+): 257.

[0084] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-15 (29.7 g, 115.6 mmol) to obtain intermediate G-15: 27.3 g, yield: 88.5%, MS (m / z) (M+): 267.

[0085] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-15 (27.3 g, 102.6 mmol) to obtain the intermediate P-15: 17.2 g, yield: 71%, MS (m / z) (M+): 238.

[0086] Intermediate Synthesis 7 This example provides an intermediate compound P-16, the synthesis route of which is as follows:

[0087] Referring to the synthesis method of E-1, the raw material C-1 was replaced by C-14 (50.0 g, 220 mmol), and D-1 was replaced by D-12 (38.4 g, 220 mmol) to obtain the intermediate E-16: 40.0 g, yield: 66%, MS (m / z) (M+): 277.

[0088] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-16 (35 g, 126.8 mmol) to obtain intermediate F-16: 26.8 g, yield: 82.2%, MS (m / z) (M+): 257.

[0089] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-16 (26.8 g, 104.3 mmol) to obtain intermediate G-16: 22.8 g, yield: 81.9%, MS (m / z) (M+): 267.

[0090] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-16 (22.8 g, 85.7 mmol) to obtain the intermediate P-16: 14.6 g, yield: 72%, MS (m / z) (M+): 238.

[0091] Intermediate Synthesis 8 This example provides an intermediate compound P-17, the synthesis route of which is as follows:

[0092] Referring to the synthesis method of E-1, the raw material C-1 was replaced with C-17 (50.0 g, 220 mmol) to obtain intermediate E-17: 44 g, yield: 72%, MS (m / z) (M+): 277.

[0093] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-17 (40 g, 145 mmol) to obtain intermediate F-17: 30.5 g, yield: 82%, MS (m / z) (M+): 257.

[0094] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-17 (30 g, 116.7 mmol) to obtain intermediate G-17: 25.5 g, yield: 81.8%, MS (m / z) (M+): 267.

[0095] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-17 (25 g, 94 mmol) to obtain the intermediate P-17: 17.1 g, yield: 77%, MS (m / z) (M+): 238.

[0096] Intermediate Synthesis 9 This example provides an intermediate compound P-18, the synthesis route of which is as follows:

[0097] Referring to the synthesis method of E-1, the raw material C-1 was replaced by C-17 (50.0 g, 220 mmol), and D-1 was replaced by D-11 (38.4 g, 220 mmol) to obtain the intermediate E-18: 46 g, yield: 76%, MS (m / z) (M+): 277.

[0098] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-18 (40 g, 145 mmol) to obtain intermediate F-18: 32.8 g, yield: 88%, MS (m / z) (M+): 257.

[0099] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-18 (30 g, 116.7 mmol) to obtain the intermediate G-18: 24.6 g, yield: 79%, MS (m / z) (M+): 267.

[0100] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-18 (20 g, 75.18 mmol) to obtain the intermediate P-18: 15 g, yield: 84%, MS (m / z) (M+): 238.

[0101] Intermediate Synthesis 10 This example provides an intermediate compound P-19, the synthesis route of which is as follows:

[0102] Referring to the synthesis method of E-1, the raw material C-1 was replaced by C-17 (50.0 g, 220 mmol), and D-1 was replaced by D-12 (38.4 g, 220 mmol) to obtain the intermediate E-19: 47.4 g, yield: 78%, MS (m / z) (M+): 277.

[0103] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-19 (40 g, 145 mmol) to obtain intermediate F-19: 32.6 g, yield: 87.5%, MS (m / z) (M+): 257.

[0104] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-19 (30 g, 116.7 mmol) to obtain intermediate G-19: 23 g, yield: 73.8%, MS (m / z) (M+): 267.

[0105] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-19 (20 g, 75.18 mmol) to obtain the intermediate P-19: 16 g, yield: 89.8%, MS (m / z) (M+): 238.

[0106] Intermediate Synthesis 11 This example provides an intermediate compound P-20, the synthesis route of which is as follows:

[0107] Referring to the synthesis method of E-1, the raw material C-1 was replaced by C-17 (50.0 g, 220 mmol), and D-1 was replaced by D-13 (38.4 g, 220 mmol) to obtain the intermediate E-20: 45 g, yield: 74%, MS (m / z) (M+): 277.

[0108] Referring to the synthesis method of F-1, the raw material E-1 was replaced with E-20 (40 g, 145 mmol) to obtain intermediate F-20: 33.5 g, yield: 90%, MS (m / z) (M+): 257.

[0109] Referring to the synthesis method of G-1, the raw material F-1 was replaced with F-20 (30 g, 116.7 mmol) to obtain intermediate G-20: 24.5 g, yield: 79%, MS (m / z) (M+): 267.

[0110] Referring to the synthesis method of P-10, the raw material G-1 was replaced with G-20 (20 g, 75.18 mmol) to obtain the intermediate P-20: 13 g, yield: 73%, MS (m / z) (M+): 238.

[0111] Intermediate Synthesis 12 The synthetic route of intermediate A1 is as follows:

[0112] Compound F-18 (25.6 g, 100 mmol), Q-1 (13.7 g, 100 mmol) and potassium carbonate (41.4 g, 300 mmol) were added to a mixed solution of 1,4-dioxane (400 mL) and water (100 mL), and then Pd-132 (0.07 g, 0.1 mmol) was added under nitrogen protection. The reaction system was then heated to 100 ° C. The heating reaction was maintained for 3 h. After cooling to room temperature, deionized water was added to quench the mixture, the liquids were separated, the organic phase was dried over anhydrous sodium sulfate, the solvent was removed by rotation, and the crude product was purified by column chromatography to obtain product U-1: 25.6 g, yield: 82%, MS (m / z) (M+): 313.

[0113] Compound W-1 (36.8 g, 110 mmol), M-1 (29.5 g, 100 mmol) and sodium tert-butoxide (28.8 g, 300 mmol) were added to toluene (400 mL), and then bis(dibenzylideneacetonepalladium) (0.92 g, 1 mmol) and Xantphos (1.15 g, 2 mmol) were added under nitrogen protection. The reaction system was then heated to 100 ° C, refluxed and maintained for 4 h, cooled to room temperature and quenched with deionized water, separated, and the organic phase was dried over anhydrous sodium sulfate. The solvent was removed by rotation, and the crude product was purified by column chromatography to obtain product X-1: 46 g, yield: 86%, MS (m / z) (M+): 536.

[0114] Compound X-1 (46 g, 85.8 mmol), N-1 (44.2 g, 128.7 mmol) and sodium tert-butoxide (24.7 g, 257.4 mmol) were added to toluene (500 mL), and then bis(dibenzylideneacetonepalladium) (1.18 g, 1.29 mmol) and tri-tert-butylphosphine (0.52 g, 2.58 mmol) were added under nitrogen protection. The reaction system was then heated to 110°C, refluxed and maintained for 6 h, cooled to room temperature and quenched with deionized water, the liquids were separated, the organic phase was dried over anhydrous sodium sulfate, the solvent was removed by rotation, and the crude product was purified by column chromatography to obtain product Y-1: 47.3 g, yield: 69%, MS (m / z) (M+): 799.

[0115] Compound Y-1 (47.3 g, 59.2 mmol), U-1 (20.4 g, 65.1 mmol) and sodium tert-butoxide (11.3 g, 118.4 mmol) were added to toluene (500 mL), and then bis(dibenzylideneacetonepalladium) (0.81 g, 0.89 mmol) and Sphos (0.80 g, 1.78 mmol) were added under nitrogen protection. The reaction system was then heated to 110°C, refluxed and maintained for 2 h, cooled to room temperature and quenched with deionized water, the liquids were separated, the organic phase was dried over anhydrous sodium sulfate, the solvent was removed by rotation, and the crude product was purified by column chromatography to obtain product Z-1: 46.7 g, yield: 77%, MS (m / z) (M+): 1026.

[0116] Compound Z-1 (46.7 g, 45.6 mmol), T-1 (12.1 g, 45.6 mmol) and sodium tert-butoxide (10.9 g, 114 mmol) were added to toluene (500 mL), and then bis(dibenzylideneacetonepalladium) (0.85 g, 0.93 mmol) and Xantphos (1.07 g, 1.86 mmol) were added under nitrogen protection. The reaction system was then heated to 100°C, refluxed and maintained for 6 h, cooled to room temperature and quenched with deionized water. The liquids were separated, the organic phase was dried over anhydrous sodium sulfate, the solvent was removed by rotation, and the crude product was purified by column chromatography to obtain product A1: 35.1 g, yield: 61%, MS (m / z) (M+): 1263.

[0117] Intermediate Synthesis 13 The synthetic route of intermediate A2 is as follows:

[0118] Referring to the synthesis method of U-1, the raw material F-18 was replaced by F-17 (25.6 g, 100 mmol), and Q-1 was replaced by Q-2 (16.5 g, 100 mmol) to obtain intermediate U-2: 28.3 g, yield: 82%, MS (m / z) (M+): 341.

[0119] Referring to the synthesis method of X-1, the raw material W-1 was replaced by W-2 (36.8 g, 110 mmol), and M-1 was replaced by M-2 (29.4 g, 100 mmol) to obtain intermediate X-2: 46 g, yield: 79%, MS (m / z) (M+): 583.

[0120] Referring to the synthesis method of Y-1, the raw material X-1 was replaced by X-2 (46 g, 78.9 mmol), and N-1 was replaced by N-2 (29.8 g, 118.3 mmol) to obtain the intermediate Y-2: 37.5 g, yield: 66%, MS (m / z) (M+): 721.

[0121] Referring to the synthesis method of Z-2, the raw material Y-1 was replaced by Y-2 (37.5 g, 52 mmol), and U-1 was replaced by U-2 (26.6 g, 78 mmol) to obtain the intermediate Z-2: 32 g, yield: 83%, MS (m / z) (M+): 1027.

[0122] Referring to the synthesis method of A1, the raw material Z-1 was replaced by Z-2 (32 g, 31.2 mmol), and T-1 was replaced by T-2 (14.6 g, 31.2 mmol) to obtain intermediate A2: 20.6 g, yield: 72%, MS (m / z) (M+): 1354.

[0123] After A1 and A2 are obtained through the above process, other intermediates can be easily obtained by using a preparation method similar to that of A1 or A2.

[0124] BD Synthesis Example Synthesis Example 1

[0125] A1 (12.63 g, 10 mmol) was added to tert-butylbenzene (125 ml), and then the temperature was lowered to -30 °C under nitrogen protection, 8 ml (20 mmol) of 2.5 M tert-butyllithium pentane solution was added, the temperature was raised to 60 °C and stirred for 2 hours, and then the temperature was lowered to -30 °C, 1.85 ml (20 mmol) of boron tribromide was added and stirred for 1 hour, and the temperature was lowered to 0 °C, 3.6 ml (20 mmol) of N,N-diisopropylethylamine was added, the temperature was raised to 60 °C and stirred for 2 hours, and then the temperature was lowered to room temperature, ice water was added to quench and the liquids were separated, the organic phase was filtered and dehydrated with anhydrous magnesium sulfate, the organic solvent was removed by rotation, and the crude product was purified by silica gel column chromatography (dichloromethane / n-heptane as mobile phase), and then purified by recrystallization from dichloromethane and n-heptane to finally obtain product B1: 0.62 g, yield: 5%, MS (m / z)(M+): 1237.

[0126] Compound B1 was prepared into a solution with toluene, and then the fluorescence intensity of the solution was measured with a fluorescence spectrophotometer to obtain the PL spectrum of compound B1 (see Figure 2 ), the results showed that the PL of compound B1 was 461nm; FWHM (half maximum width) = 22nm.

[0127] Synthesis Example 2

[0128] A2 (13.68 g, 10 mmol) was added to tert-butylbenzene (120 ml), and then the temperature was lowered to -30°C under nitrogen protection, 10 ml (20 mmol) of 2 M n-butyllithium pentane solution was added, the temperature was raised to 60°C and stirred for 2 hours, then the temperature was lowered to -20°C, 1.85 ml (20 mmol) of boron tribromide was added and stirred for 1 h, the temperature was lowered to 0°C, 3.6 ml (20 mmol) of N,N-diisopropylethylamine was added, the temperature was raised to 60°C and stirred for 2 h, and ice water was added to cool to room temperature to quench and separate the liquids. After filtering the organic phase, anhydrous magnesium sulfate was used to remove water, and after the organic solvent was removed by rotation, the crude product was purified by silica gel column chromatography (dichloromethane / n-heptane as mobile phase), and then purified by recrystallization from dichloromethane and n-heptane to finally obtain product B2: 0.58 g, yield: 4.5%, MS (m / z)(M+): 1297.

[0129] Synthesis Example 3

[0130] The method is the same as that of Synthesis Example 2, except that A3 (10.75 g, 10 mmol) replaces A1, and finally the product B3 is obtained: 0.7 g, yield: 7%, MS (m / z) (M+): 1005.

[0131] Synthesis Example 4

[0132] The method is the same as that of Synthesis Example 2, except that A4 (13.81 g, 10 mmol) replaces A2, and finally the product B4 is obtained: 0.59 g, yield: 4.5%, MS (m / z) (M+): 1311.

[0133] Synthesis Example 5

[0134] The method is the same as that of Synthesis Example 2, except that A5 (13.27 g, 10 mmol) is used to replace A2, and finally the product B5 is obtained: 0.76 g, yield: 6%, MS (m / z) (M+): 1271.

[0135] Figure 3This is the PL spectrum of Synthesis Example 5. The testing method is the same as Synthesis Example 1. The test results show that the PL of Compound B5 is 460nm; FWHM (half maximum width) = 21nm.

[0136] Synthesis Example 6

[0137] The method is the same as that of Synthesis Example 2, except that A6 (11.79 g, 10 mmol) replaces A2, and finally the product B6 is obtained: 0.61 g, yield: 5.5%, MS (m / z) (M+): 1109.

[0138] Synthesis Example 7

[0139] The method is the same as that of Synthesis Example 1, except that A7 (13.87 g, 10 mmol) replaces A1, and finally the product B7 is obtained: 1.17 g, yield: 8.5%, MS (m / z) (M+): 1361.

[0140] Synthesis Example 8

[0141] The method is the same as that of Synthesis Example 2, except that A8 (12.33 g, 10 mmol) is used to replace A2, and finally the product B8 is obtained: 0.46 g, yield: 4%, MS (m / z) (M+): 1163.

[0142] Synthesis Example 9

[0143] The method is the same as that of Synthesis Example 2, except that A9 (12.03 g, 10 mmol) is used to replace A2, and finally the product B9 is obtained: 0.75 g, yield: 6.6%, MS (m / z) (M+): 1133.

[0144] Synthesis Example 10

[0145] The method is the same as that of Synthesis Example 2, except that A10 (13.05 g, 10 mmol) is used to replace A1, and finally product B10 is obtained: 0.57 g, yield: 4.6%, MS (m / z) (M+): 1235.

[0146] Synthesis Example 11

[0147] The method is the same as that of Synthesis Example 2, except that A2 is replaced by A11 (12.69 g, 10 mmol), and the final product B11 is obtained: 0.67 g, yield: 5.6%, MS (m / z) (M+): 1199.

[0148] Synthesis Example 12

[0149] The method is the same as that of Synthesis Example 2, except that A12 (13.67 g, 10 mmol) is used to replace A2, and finally the product B12 is obtained: 0.78 g, yield: 6%, MS (m / z) (M+): 1297.

[0150] Synthesis Example 13

[0151] The method is the same as that of Synthesis Example 2, except that A13 (11.95 g, 10 mmol) is used to replace A2, and finally product B13 is obtained: 0.56 g, yield: 5%, MS (m / z) (M+): 1110.

[0152] Synthesis Example 14

[0153] The method is the same as that of Synthesis Example 2, except that A14 (13 g, 10 mmol) is used to replace A2, and finally the product B14 is obtained: 0.85 g, yield: 7%, MS (m / z) (M+): 1223.

[0154] Synthesis Example 15

[0155] The method is the same as that of Synthesis Example 2, except that A15 (11.6 g, 10 mmol) is used to replace A2, and finally the product B15 is obtained: 0.76 g, yield: 7%, MS (m / z) (M+): 1087.

[0156] Synthesis Example 16

[0157] The method is the same as that of Synthesis Example 2, except that A16 (13.2 g, 10 mmol) replaces A2, and finally the product B16 is obtained: 0.99 g, yield: 8%, MS (m / z) (M+): 1245.

[0158] Synthesis Example 17

[0159] The method is the same as that of Synthesis Example 2, except that A17 (13.2 g, 10 mmol) is used to replace A2, and finally the product B17 is obtained: 0.75 g, yield: 6%, MS (m / z) (M+): 1245.

[0160] Comparative compounds Here are a few compounds that were tested during the study:

[0161]

[0162] Material properties The compounds prepared in the synthesis examples of the present invention and the comparative compounds were subjected to a thermal stability test, and the test steps are as follows: the material to be tested is placed in a thermal stabilizer, sublimated at 280°C, refined for 240 hours, and then the solid sample obtained by sublimation is dissolved and diluted with a mobile phase, and the change in material purity before and after the experiment is tested by a high performance liquid chromatograph. The smaller the purity difference, the better the thermal stability of the material. As can be seen from the table below, compared with compounds H1-H6, the materials of the present invention show significant improvements in thermal stability, reaching a level comparable to that of conventional BD materials.

[0163] Table 1

[0164] Note: Purity change before and after the thermal stability test <0.01% is evaluated as "excellent"; purity change between 0.01%-0.1% is evaluated as "good"; purity change >0.1% is evaluated as "moderate".

[0165] Fabrication and characterization of OLEDs The following organic electroluminescent device includes an anode, a hole transport region, a light-emitting layer, an electron transport region, a cathode, and a covering layer which are sequentially arranged on a substrate; wherein: the hole transport region includes a hole injection layer, a hole transport layer, and a light-emitting auxiliary layer; the electron transport region includes a hole blocking layer, an electron transport layer, and an electron injection layer; the light-emitting layer is composed of a host and a guest, and the host material of the light-emitting layer can be composed of one molecular material or multiple molecular materials.

[0166] The anode of the following embodiments adopts anode materials commonly used in the art, such as ITO, Ag or their multilayer structures. The hole injection unit adopts hole injection materials commonly used in the art, and NDP-9 and the like are added for doping. The hole transport unit adopts hole transport materials commonly used in the art. The light-emitting unit adopts light-emitting materials commonly used in the art, for example, it can be composed of a host material and an emitted guest material doped, and the emitted guest material can be an organic material such as a pyrene compound, or a metal complex (such as metal Ir, Pt, etc.). The electron transport unit adopts electron transport materials commonly used in the art. The electron injection layer adopts electron injection materials commonly used in the art, such as Liq, LiF, Yb, etc. The cathode adopts materials commonly used in the art, such as metal Al, Ag or metal mixtures (Ag-doped Mg, Ag-doped Ca, etc.).

[0167] Device Example 1 The electrode preparation method and the deposition method of each functional layer in this embodiment are conventional methods in the art, such as vacuum thermal evaporation or inkjet printing, etc., which will not be described in detail here. Only some process details and test methods in the preparation process are supplemented as follows: The substrates used in the present invention were subjected to the following operations: the ITO substrate was patterned so that its luminous area had a size of 3 mm×3 mm, and then water / isopropanol ultrasound, UV / ozone irradiation, and then dried at 100°C. After that, the ITO substrate was mounted on a substrate holder of a vacuum deposition device and the pressure was adjusted so that the vacuum rate became 1×10 -7 torr.

[0168] Subsequently, the following operations were performed: first, on the ITO layer (anode) formed on the substrate, a compound HTL and a compound P-dopant (the mass ratio of HTL to P-dopant was 97:3) were vacuum deposited with a thickness of 10 nm to form a hole injection layer; secondly, on the hole injection layer, a compound HTL was vacuum deposited with a thickness of 120 nm to form a hole transport layer; secondly, on the hole transport layer, a compound B-Prime was vacuum deposited with a thickness of 5 nm to form an electron blocking layer; secondly, on the electron blocking layer, a mixture of a compound BH and a compound B1 was vacuum deposited with a thickness of 20 nm to form a light-emitting layer, wherein the compound BH was used as a host and the compound B1 was used as a guest, and the mass ratio of the host to the guest was 98:2; then, on the light-emitting layer, a compound HB was vacuum deposited with a thickness of 5 nm to form a hole blocking layer; and then On the hole blocking layer, compound ETL and compound Liq (the mass ratio of ETL to Liq is 1:1) are vacuum deposited with a thickness of 20 nm to form an electron transport layer; then, on the electron transport layer, Yb is vacuum deposited with a thickness of 1 nm to form an electron injection layer; then, on the electron injection layer, Mg and Ag (the mass ratio of Mg to Ag is 1:9) are deposited with a thickness of 15 nm to form a cathode; then, on the cathode, compound CPL is deposited with a thickness of 50 nm to form a covering layer; finally, the vapor-deposited substrate is packaged, and the cleaned cover plate is coated with UV glue using a glue coating device, and then the coated cover plate is moved to a pressing section, and the vapor-deposited substrate is placed on the upper end of the cover plate, and finally, the substrate and the cover plate are bonded by a bonding device, and the UV glue is light-cured at the same time to prepare a laminated organic electroluminescent device.

[0169] Except for the material B1 used in the present invention, the molecular structures of the remaining materials of the device are as follows:

[0170]

[0171]

[0172]

[0173] Device Examples 2-17 The above method is used to prepare the compounds described in the examples into organic electroluminescent devices, wherein B2-B17 are used to replace B1 to prepare organic electroluminescent device examples 2-17.

[0174] Device Comparison Examples 1-6 The above method was used to prepare the compounds described in the comparative examples into organic electroluminescent devices, specifically, organic electroluminescent device comparative examples 1-6 were prepared by replacing B1 with H1-H6.

[0175] The OLED devices described above were tested by standard methods. For this purpose, at J = 10 mA / cm 2 The driving voltage and luminous efficiency of the organic electroluminescent device are determined at a current density of J = 20 mA / cm 2 When working under LT95, the luminous brightness drops to 95% of its initial value L0 after time LT95.

[0176] The test instruments and methods for testing the performance of the OLED devices in the above embodiments and comparative examples are as follows: The luminous efficiency CE (cd / A) and color coordinates (CIEy) were tested using a spectrum scanner PhotoResearch PR-635; Current density and lighting voltage: tested using a digital source meter Keithley 2400; The luminous efficiency of blue light devices is greatly affected by chromaticity. The industry generally uses BI value as the basis for the efficiency of blue light devices. BI (Blue index) is obtained by dividing the luminous efficiency CE (cd / A) by the color coordinate (CIEy); Life test: Use silicon photoelectric OLED device life test system.

[0177] The test results are shown in Table 2.

[0178] Table 2

[0179] Through the above-mentioned device embodiments 1-17 and device comparative examples 1-6, the following conclusions can be drawn: the organic electroluminescent device provided by the present invention has significant advantages in luminescent performance, generally has a higher BI value and a longer life, and more importantly, has a higher thermal stability. This is because the BD compounds provided by the present invention all adopt a cyclohexyl dibenzofuran structure. Under the mutual repulsion of the lone pair of electrons of the oxygen atom in the cyclohexyl dibenzofuran structure, the intermolecular distance is increased, the fluorescence quantum yield is improved, and the device efficiency is improved and the life span is extended. Help. In addition, by adopting this non-planar cyclohexane dibenzofuran structural design, the thermal stability of the molecule is increased, the rigidity of the BD molecule is increased, and the problem of device performance attenuation due to heat is indirectly reduced, and the device efficiency and life are improved.

[0180] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A blue light-emitting compound containing a cyclohexyldibenzofuran structure, characterized in that: The general structural formula of the blue light-emitting compound is shown in Formula I or Formula II: AND; II; in, X represents O or S; Ar1 represents a cyclohexyldibenzofuranyl group; Ar2 represents any one of a substituted or unsubstituted aryl group having C6 to C60 carbon atoms, a substituted or unsubstituted heteroaryl group having C5 to C60 carbon atoms, a substituted or unsubstituted condensed ring aryl group having C6 to C60 carbon atoms, and a substituted or unsubstituted heterocondensed ring aryl group having C5 to C60 carbon atoms; L represents a single bond, or a substituted or unsubstituted arylene group having carbon atoms of C6 to C12; R1, R2, and R3 each independently represent any one of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having C1 to C30 carbon atoms, substituted or unsubstituted alkenyl having C2 to C30 carbon atoms, substituted or unsubstituted cycloalkyl having C3 to C30 carbon atoms, substituted or unsubstituted aryl having C6 to C60 carbon atoms, substituted or unsubstituted heteroaryl having C5 to C60 carbon atoms, substituted or unsubstituted condensed ring aryl having C6 to C60 carbon atoms, and substituted or unsubstituted heterocondensed ring aryl having C5 to C60 carbon atoms, wherein two or more R1, R2, and R3 may be connected to each other to form an aliphatic ring, an aromatic ring, or a condensed ring; When Ar2, R1, R2, and R3 contain a substituent, the substituent is selected from any one of an alkyl group having carbon atoms of C1 to C10, a cycloalkyl group having carbon atoms of C3 to C10, an aryl group having carbon atoms of C6 to C20, and a substituted or unsubstituted heteroaryl group having carbon atoms of C5 to C20; m and p each independently represent 0, 1, 2, 3 or 4, and n represents 0, 1, 2 or 3; In Formula I and Formula II, any hydrogen can be replaced by deuterium, any nitrogen can be replaced by nitrogen-15, any sulfur can be replaced by sulfur-33, sulfur-34 or sulfur-36, any oxygen can be replaced by oxygen-17 or oxygen-18, any carbon can be replaced by carbon-13, and any boron can be replaced by boron-11.

2. The blue luminescent compound according to claim 1, characterized in that Said X represents O; The above-mentioned L represents any one of a single bond, a substituted or unsubstituted phenylene group, and a substituted or unsubstituted naphthylene group.

3. The blue luminescent compound according to claim 1, characterized in that The Ar1 represents one of the following structures: 、 、 。 4. The blue luminescent compound according to claim 1, characterized in that: The general structural formula of the blue light-emitting compound is shown in any one of Formula I-1 to Formula I-5: I-1、 I-2、 I-3、 I-4、 I-5。 5. The blue light-emitting compound according to claim 1, characterized in that: The R1, R2, and R3 each independently represent any one of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl with carbon atoms of C1 to C10, substituted or unsubstituted cycloalkyl with carbon atoms of C3 to C10, substituted or unsubstituted aryl with carbon atoms of C6 to C20, substituted or unsubstituted heteroaryl with carbon atoms of C5 to C20, substituted or unsubstituted condensed ring aryl with carbon atoms of C6 to C20, and substituted or unsubstituted heterocondensed ring aryl with carbon atoms of C5 to C20, wherein two or more R1, R2, and R3 can be connected to each other to form a five-membered ring or a six-membered ring; Ar2 represents any one of a substituted or unsubstituted aryl group having C6 to C20 carbon atoms, a substituted or unsubstituted heteroaryl group having C5 to C20 carbon atoms, a substituted or unsubstituted condensed ring aryl group having C6 to C20 carbon atoms, and a substituted or unsubstituted heterocondensed ring aryl group having C5 to C20 carbon atoms.

6. The blue light-emitting compound according to claim 1, characterized in that: The R1 and R2 each independently represent , , , , , Any one of .

7. The blue light-emitting compound according to claim 1, characterized in that: The L represents , , , Any one of .

8. The blue light-emitting compound according to claim 1, characterized in that: The Ar2 represents one of the following structures: 、 ； R4 represents any one of an alkyl group having carbon atoms of C1 to C10 and a cycloalkyl group having carbon atoms of C3 to C10; R5 represents a single substituent to the maximum permissible substituent, and is selected from any one of H, an alkyl group having C1 to C10 carbon atoms, and a cycloalkyl group having C3 to C10 carbon atoms.

9. The blue light-emitting compound according to claim 1, characterized in that: The blue light-emitting compound is selected from one of the following structures: 。 10. An organic electroluminescent device, characterized in that: It includes an anode, a hole transport region, a light-emitting layer, an electron transport region, and a cathode which are sequentially arranged on a substrate; wherein the light-emitting layer includes a host material and a guest material, and the guest material includes one or more blue light-emitting compounds as described in any one of claims 1 to 9.

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