%0 Journal Article %T Host engineering for high efficiency in phosphorescent organic light emitting diodes %A Kim, Sung Hyun %A Yook, Kyoung Soo %J Proceedings of SPIE %V 6828 %N 1 %P 68280M-68280M-8 %@ 0277-786X %D 2007-11-29 %I SPIE %~ DeepDyve