Red light organic electrophosphorescent material, preparation method thereof and organic electroluminescent device
A phosphorescent material, electromechanical technology, applied in luminescent materials, electro-solid devices, organic chemistry, etc., can solve problems such as poor blue color purity, and achieve the effect of lowering HOMO energy level, lowering evaporation temperature, and easy preparation
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[0045] figure 1 It is a schematic diagram of the preparation process of the blue-light organic electrophosphorescent material in an embodiment. see figure 1 , the preparation method of the above-mentioned blue light organic electrophosphorescent material, comprising the following steps:
[0046] (1) Under the protection of inert gas, the structural formula is The compound A and the structural formula are The compound B is dissolved in the first organic solvent containing catalyst and alkali to obtain a reaction solution, which is subjected to Suzuki coupling reaction. After the reaction is stopped, the reaction solution is separated and purified to obtain the structural formula: Cyclometallic ligands; wherein, the molar ratio of compound A to compound B is 1:1 to 1:1.5, the coupling reaction time is 6 to 10 hours, and the reaction temperature is 80 to 100°C;
[0047] The reaction formula is:
[0048]
[0049] (2) Under the protection of an inert gas, dissolve the cy...
Embodiment 1
[0077] Example 1: Complex bis(2-(3',5'-difluoro-4'-cyanophenyl)pyrimidine-N,C 2 ') Synthesis of (2-pyridinecarboyl) iridium
[0078] (1) Synthesis of 2-(3',5'-difluoro-4'-cyanophenyl)pyrimidine
[0079]
[0080] Under nitrogen protection, 1.59g (10mmol) 2-bromopyrimidine, 2.20g (12mmol) 3,5-difluoro-4-cyanophenylboronic acid and 0.58g (0.5mmol) tetrakis (triphenylphosphine) palladium were dissolved in 40mL of toluene, and then dropwise added 20mL of an aqueous solution containing 2.76g (20mmol) of potassium carbonate to the reaction system. Heated and stirred at 100°C for 6h. After the reaction solution was cooled to room temperature, it was extracted with dichloromethane, separated, washed with water until neutral, and dried over anhydrous magnesium sulfate. After filtration, the filtrate was distilled off the solvent under reduced pressure to obtain the crude product. Silica gel column chromatography was performed with ethyl acetate and n-hexane at a volume ratio of 1...
Embodiment 2
[0101] Example 2: Complex bis(2-(3',5'-difluoro-4'-cyanophenyl)-5-methylpyrimidine-N,C 2 Synthesis of ')(2-pyridinecarboyl)iridium
[0102] (1) Synthesis of 2-(3',5'-difluoro-4'-cyanophenyl)-5-methylpyrimidine
[0103]
[0104] Under nitrogen protection, 1.73g (10mmol) 2-bromo-5-methylpyrimidine, 1.83g (10mmol) 3,5-difluoro-4-cyanophenylboronic acid and 0.28g (0.4mmol) dichlorobis(triphenyl Phosphorus) palladium was dissolved in 50 mL of DMF, and then 25 mL of an aqueous solution containing 3.18 g (30 mmol) of sodium carbonate was added dropwise to the reaction system. Stir the reaction under heating to 90°C for 8 hours. After the reaction solution was cooled to room temperature, it was extracted with dichloromethane, separated, washed with water until neutral, and dried over anhydrous magnesium sulfate. After filtration, the filtrate was distilled off the solvent under reduced pressure to obtain the crude product. Silica gel column chromatography was performed with eth...
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