Bipolar copolymer blue phosphorescence main material, preparation method thereof and organic electroluminescent device

[0032] The bipolar copolymer blue-light phosphorescent host material of this embodiment, that is, poly{N-(4-n-hexyloxyphenyl)-2,7-diylcarbazole-co-3,5-di(3-yl -Phenyl)-4-naphthyl-4H-1,2,4-triazole} (P1) (where R is n-hexyl, n=39), its structural formula is as follows:

[0033]

[0034] The preparation steps of above-mentioned polymer are as follows:

[0035] The reaction formula is as follows:

[0036]

[0037] Under argon protection, N-(4-n-hexaneoxyphenyl)-2,7-dipinacol borate carbazole (119mg, 0.2mmol), 3,5-bis(3-bromobenzene Base)-4-naphthyl-4H-1,2,4-triazole (101mg, 0.2mmol) was added to a flask containing 10ml of toluene solvent, and after fully dissolving, potassium carbonate (2mL, 2mol / L) solution was added to In the flask, the oxygen was vacuumed and filled with argon, and then bistriphenylphosphine palladium dichloride (5.6mg, 0.008mmol) was added; the flask was heated to 100°C for Suzuki coupling reaction for 48h. Subsequently, the polymerization reaction wa

[0041] The bipolar copolymer blue-light phosphorescent host material of this embodiment, that is, poly{N-(4-methoxyphenyl)-2,7-diylcarbazole-co-3,5-bis(3-yl- Phenyl)-4-naphthyl-4H-1,2,4-triazole} (where R is methyl, n=98), its structural formula is as follows:

[0042]

[0043] The preparation steps of above-mentioned polymer are as follows:

[0044] The reaction formula is as follows:

[0045]

[0046]Under the protection of a mixed gas of nitrogen and argon, N-(4-methoxyphenyl)-2,7-dipinacol borate carbazole (130mg, 0.3mmol), 3,5-bis(3- Bromophenyl)-4-naphthyl-4H-1,2,4-triazole (152mg, 0.3mmol) and 15mL tetrahydrofuran were added to a 50mL two-necked bottle, and after fully dissolving, a mixture of nitrogen and argon was introduced to exhaust After about 20 minutes in the air, tetrakistriphenylphosphine palladium (4mg, 0.003mmol) was added into it, and after fully dissolved, sodium bicarbonate (3mL, 2mol / L) solution was added. Then, the mixed gas of nitrogen and argo

[0049] The bipolar copolymer blue-light phosphorescent host material of this embodiment, that is, poly{N-(4-n-eicosyloxyphenyl)-2,7-diylcarbazole-co-3,5-bis(3 -yl-phenyl)-4-naphthyl-4H-1,2,4-triazole} (where R is n-eicosyl, n=83), its structural formula is as follows:

[0050]

[0051] The preparation steps of above-mentioned polymer are as follows:

[0052] The reaction formula is as follows:

[0053]

[0054] Under nitrogen protection, N-(4-n-eicosyloxyphenyl)-2,7-dipinacol borate carbazole (238mg, 0.3mmol), 3,5-bis(3-bromobenzene base)-4-phenyl-4H-1,2,4-triazole (167mg, 0.33mmol), palladium acetate (3.5mg, 0.015mmol) and tris(o-methoxyphenyl)phosphine (21mg, 0.06mmol ) into a flask containing 12mL of N,N-dimethylformamide, fully dissolved and then adding potassium carbonate (3mL, 2mol / L) solution, and then blowing nitrogen into the flask and exhausting the air for about 30min; the flask was heated The Suzuki coupling reaction was performed at 130°C for 12h. Subsequ