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

Abstract

High-efficiency deep blue organic light-emitting devices have been fabricated using asymmetrically substituted 9-(α-naphthyl)-10-(β-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 4.9cd∕A and an external quantum efficiency of 4.4% at a current density of 20mA∕cm2 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 10to100mA∕cm2.