Nine-site functional fluorenyl aromatic single-phosphine oxide electroluminescent material and preparation method thereof
An electroluminescent material and functionalization technology, applied in luminescent materials, chemical instruments and methods, circuits, etc., can solve the problems of low external quantum efficiency of blue light devices, achieve balanced carrier injection and transport performance, and high-efficiency deep blue light Emission, inhibitory effect of concentration quenching
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specific Embodiment approach 1
[0021] Specific Embodiment 1: The structural formula of the 9-position functionalized fluorenyl aromatic monophosphine oxide electroluminescent material in this embodiment is as follows: where R is
specific Embodiment approach 2
[0022] Specific embodiment two: The preparation method of the 9-position functionalized fluorenyl aromatic monophosphine oxide electroluminescent material in this embodiment is carried out according to the following steps:
[0023] 1. Mix 1mmol of 9,9-bis-(di-p-bromophenyl)fluorene, 0.005-0.045mmol of tetrakis(triphenylphosphine)palladium(Pd(PPh 3 ) 4 ) and 0.01-0.5mmol tetrabutylammonium bromide (TBAB) were added to 3-10mL tetrahydrofuran under the condition of argon protection and light shielding for dissolving, adding 0.5-3ml concentration was 2mol / L NaOH solution, and then 0.1 -2mmol of borate was dissolved in 5ml of tetrahydrofuran and added, then reacted at 80-90°C for 8-32h, extracted with saturated ammonium chloride solution, dried, and column chromatographed to obtain the brominated intermediate;
[0024] 2. Dissolve 1 mmol of the brominated intermediate in anhydrous ether or tetrahydrofuran, add 1-2 mmol of n-butyllithium dropwise at -78 to 0°C, react for 1 to 2 hou...
specific Embodiment approach 3
[0025] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the borate described in step one is diethylfluorene borate, phenylcarbazole borate, triphenylamine borate or naphthyl Phenylamine borate. Others are the same as in the second embodiment.
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