A dibenzofuran-based host material for blue electrophosphorescence |
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Authors: | Vecchi Paul A Padmaperuma Asanga B Qiao Hong Sapochak Linda S Burrows Paul E |
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Institution: | Material Science Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA. |
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Abstract: | Dibenzofuran (DBF) is converted to a vacuum-sublimable, electron-transporting host material via 2,8-substitution with diphenylphosphine oxide moieties. Close pi-pi stacking and the inductive influence of P=O moieties impart favorable electron-transport properties without lowering the triplet energy. A maximum external quantum efficiency of 10.1% and luminance power efficiency of 25.9 lm/W are realized using this material as the host for the blue-green electrophosphorescent molecule, iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-N,C(2')picolinate (FIrpic). |
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