Blue Electrophosphorescent Light-emitting Device Using a Novel Nonconjugated Polymer as Host Materials

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• Blue electrophosphorescent organic light-emitting devices (PHOLEDs) were fabricated by doping a phosphorescent iridium complex, bis[(4,6-difluorophenyl)pyridinato-<I>N</I>,<I>C</I><SUP>2</SUP>](picolinato)iridium(III) (Firpic) into a novel nonconjugated polymer, poly[(9,9-diethylfluoren-2,7-ylene)diphenylsilylene] (PF-Si). A device with the same configuration using the widely applied poly(9-vinylcarbazole) (PVK) as the host material was also prepared under the identical conditions for comparison. The luminance and current efficiency of the PF-Si:Firpic device were over four times higher than those of the PVK–Firpic device at a current density of 200 mA/cm<SUP>2</SUP> (1260 cd/m<SUP>2</SUP> vs 275 cd/m<SUP>2</SUP>, 0.61 cd/A vs 0.13 cd/A).

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公益社団法人 日本化学会 | 論文

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