Bipolar blue light phosphorescent host material, preparation method and organic electroluminescent device thereof

[0037] The bipolar blue phosphorescent host material of this embodiment has the structure: 9-(4-(3,5-diphenyl-4H-1,2,4-triazol-4-yl)benzene)-9H- Carbazole, the structural formula is as follows:

[0038]

[0039] The preparation process of the compound is as follows:

[0040]

[0041] Under the protection of nitrogen, 3,5-diphenyl-4H-1,2,4-triazole (17.7g, 80mmol) was dissolved in 200mL of N,N-dimethylformamide (DMF) solution, and then 9 -(4-Bromophenyl)-9H-carbazole (25.7g, 80mmol), potassium carbonate (22.1g, 160mmol), cuprous iodide (1.52g, 8mmol). The mixture was stirred and reacted at 120°C for 3 hours. The reaction was stopped, cooled to room temperature, filtered, and the solid was washed three times with distilled water. The crude product was separated by a silica gel chromatography column using eluent n-hexane, and then dried under vacuum at 50°C for 24 hours to obtain an off-white solid bipolar blue phosphorescent host material. The yield was 81%.

[0042] Mass spectrum: m

[0045] The bipolar blue phosphorescent host material of this embodiment is: 9-(4-(3,5-diphenyl-4H-1,2,4-triazol-4-yl)benzene)-9H-carbazole , The structural formula is as follows:

[0046]

[0047] The preparation process of the compound is as follows:

[0048]

[0049] Under the protection of nitrogen, 3,5-diphenyl-4H-1,2,4-triazole (17.7g, 80mmol) was dissolved in 200mL of toluene (Tol) solution, and then 9-(4-bromophenyl) was added )-9H-carbazole (28.2g, 88mmol), cesium carbonate (57.2g, 176mmol), copper powder (0.768g, 12mmol). The mixture was stirred and reacted at 110°C for 6 hours. The reaction was stopped, cooled to room temperature, filtered, and the solid was washed three times with distilled water. The crude product was separated by a silica gel chromatography column using eluent n-hexane, and then dried under vacuum at 50°C for 24 hours to obtain an off-white solid bipolar blue phosphorescent host material. The yield was 78%.

[0051] The bipolar blue phosphorescent host material of this embodiment is: 9-(4-(3,5-diphenyl-4H-1,2,4-triazol-4-yl)benzene)-9H-carbazole , The structural formula is as follows:

[0052]

[0053] The preparation process of the compound is as follows:

[0054]

[0055] Under the protection of nitrogen, 3,5-diphenyl-4H-1,2,4-triazole (17.7g, 80mmol) was dissolved in 200mL of acetonitrile (MeCN) solution, and then 9-(4-bromophenyl) )-9H-carbazole (30.8g, 96mmol), potassium phosphate (39g, 184mmol), cuprous oxide (2.3g, 16mmol). The mixture was stirred and reacted at 90°C for 8 hours. The reaction was stopped, cooled to room temperature, filtered, and the solid was washed three times with distilled water. The crude product was separated by a silica gel chromatography column using eluent n-hexane, and then dried under vacuum at 50°C for 24 hours to obtain an off-white solid bipolar blue phosphorescent host material. The yield was 74%.