Abstract

A novel emitting amorphous molecular material with a high glass-transition temperature of 158°C, 2,5-bis {4-[bis-(9,9-dimethyl-2-fluorenyl)amino]phenyl}thiophene (BFA-1T), has been developed. BFA-1T emits greenish blue light with a relatively high fluorescence quantum yield of 0.48 in solution. A multilayer organic electroluminescent device using BFA-1T emitted greenish blue light with a maximum luminance of 12350 cd m -2 at 11 V with a luminous efficiency of 1.1 lm W -1 at a luminance of 300 cd m -2 . The device worked even at 170°C.

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