%0 Journal Article %T Efficient blue organic light-emitting diodes with 4H-cyclopentadefphenanthrene %A Suh, Hongsuk %J Proceedings of SPIE %V 6655 %N 1 %P 66550A-66550A-9 %@ 0277-786X %D 2007-09-13 %I SPIE %~ DeepDyve