Dibenzothiophene unit-containing blue light phosphorescent body material, preparation method thereof and organic electroluminescent device
A technology of dibenzothiophene and phosphorescent host is applied in the field of blue phosphorescent host material and its preparation, and organic electroluminescent devices, which can solve problems such as shortage, and achieve the effects of reduced manufacturing cost, reduced technological process and easy availability of raw materials
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Embodiment 1
[0038] Example 1: The blue phosphorescent host material containing dibenzothiophene units of this example, namely 4-(9,9'-spirobifluoren-4-yl)dibenzo[b,d]thiophene, is prepared as follows :
[0039]
[0040] Under the protection of argon, 4-bromo-9,9'-spirobifluorene (79mg, 0.2mmol), benzo[b,d]dithiophene-4-boronic acid (46mg, 0.2mmol) were added to 10ml of toluene solvent In the flask, after fully dissolving, add potassium carbonate (2mL, 2mol / L) solution into the flask, vacuum to remove oxygen and fill with argon, then add bistriphenylphosphine palladium dichloride (5.6mg, 0.008mmol ); The flask was heated to 100°C for Suzuki coupling reaction for 24h. The reaction was stopped and cooled to room temperature. The reaction solution was extracted three times with dichloromethane, and the organic phases obtained from the extraction were combined. The organic phase was dried with anhydrous magnesium sulfate and spin-dried to obtain a crude product. The crude product was used with a...
Embodiment 2
[0042] Embodiment 2: The blue phosphorescent host material containing dibenzothiophene units of this embodiment, namely 4-(9,9'-spirobifluoren-4-yl)dibenzo[b,d]thiophene, is prepared as follows :
[0043]
[0044] Under the protection of a mixture of nitrogen and argon, combine 4-bromo-9,9'-spirobifluorene (119mg, 0.3mmol), benzo[b,d]dithiophene-4-boronic acid (75mg, 0.33mmol) and 15mL Tetrahydrofuran was added to a 50mL two-necked flask, and after it was fully dissolved, a mixture of nitrogen and argon was introduced to exhaust the air for about 20 minutes, then tetrakistriphenylphosphine palladium (4mg, 0.003mmol) was added to it, and carbonic acid was added after fully dissolved Sodium hydrogen (3mL, 2mol / L) solution. After fully ventilating the mixture of nitrogen and argon for about 10 minutes, the two-neck flask was added to 70°C for Suzuki coupling reaction for 48 hours. The reaction was stopped and cooled to room temperature. The reaction solution was extracted three ti...
Embodiment 3
[0045] Embodiment 3: The blue phosphorescent host material containing dibenzothiophene units of this embodiment, namely 4-(9,9'-spirobifluoren-4-yl)dibenzo[b,d]thiophene, is prepared as follows :
[0046]
[0047] Under the protection of nitrogen, 4-bromo-9,9'-spirobifluorene (119mg, 0.3mmol), benzo[b,d]dithiophene-4-boronic acid (81mg, 0.36mmol), palladium acetate (3.5mg, 0.015mmol) and tris(o-methoxyphenyl)phosphine (21mg, 0.06mmol) were added to a flask containing 12mL of N,N-dimethylformamide, and potassium carbonate (3mL, 2mol / L) Solution, and then purge the flask with nitrogen gas for about 30 minutes; heat the flask to 130°C for Suzuki coupling reaction for 12 hours. The reaction was stopped and cooled to room temperature. The reaction solution was extracted three times with dichloromethane, and the organic phases obtained from the extraction were combined. The organic phase was dried over anhydrous magnesium sulfate and spin-dried to obtain a crude product. The crude pr...
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