A dibenzofuran-based host material for blue electrophosphorescence.
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).
Vecchi
Paul A
PA
Material Science Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
Padmaperuma
Asanga B
AB
Qiao
Hong
H
Sapochak
Linda S
LS
Burrows
Paul E
PE