High-efficiency deep blue host for organic light-emitting devices

High-efficiency deep blue organic light-emitting devices have been fabricated using asymmetrically substituted 9-(alpha-naphthyl)-10-(beta-naphthyl)-anthracene as blue host material and diphenyl-[4-(2-[1,1(');4('),1(')]terphenyl-4-yl-vinyl)-phenyl]amine as dopant emitter. With an optimized device structure and doping concentration, the deep blue electroluminescent (EL) device achieved an EL efficiency of 4.9 cd/A and an external quantum efficiency of 4.4% at a current density of 20 mA/cm(2) at saturated blue Commission Internationale de l'Eclairage coordinates of (0.15, 0.13). The deep blue device also has a current efficiency which is invariable with driving conditions ranging from 10 to 100 mA/cm(2). (c) 2007 American Institute of Physics.