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Efficient single layer solution-processed blue-emitting electrophosphorescent devices based on a small-molecule host
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We report highly efficient single layer solution-processed blue small-molecule electrophosphorescent organic light-emitting diodes with iridium (III) bis[2-(4,6-difluorophenyl)-pyridinato-]picolinate (FIrpic) doped into a wide-gap 9,9-bis[4-(3 c6-di-tert-butylcarbazol-9-yl)phenyl]fluorene (TBCPF) as the emission layer. An optimized device with 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxidiazolyl]phenylene as the electron-transporting component doped into the emission layer, with a blue electrophosphorescence peaked at from FIrpic, shows a maximum luminance efficiency of at and brightness of at . We attribute the high performance to the excellent film forming ability and high triplet energy of TBCPF.
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