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A Dibenzofuran-Based Host Material for Blue Electrophosphorescence
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Dibenzofuran (DBF) is converted to a vacuum-sublimable, electron-transporting host material via 2,8-substitution with diphenylphosphineoxide moieties. Close es/gifchars/pi.gif" BORDER=0 >-es/gifchars/pi.gif" BORDER=0 > stacking and the inductive influence of P=O moieties impart favorable electron-transport properties without loweringthe triplet energy. A maximum external quantum efficiency of 10.1% and luminance power efficiency of 25.9 lm/W are realized using thismaterial as the host for the blue-green electrophosphorescent molecule, iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-N,C2')picolinate (FIrpic).

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