Development of high-performance blue–violet-emitting organic electroluminescent devices

Two high-performance blue-violet-emitting organic electroluminescent devices with electroluminescence peaking at 404 and 415 nm were developed using a hole-blocking amorphous molecular material, 1,3,5-tris(4-fluorobiphenyl-4′-yl)benzene, and emitting amorphous molecular materials, N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine and N,N′-di(4-biphenylyl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine. The devices show maximum luminaces of 3960 cd m−2 at 15 V and 2550 cd m−2 at 12.0 V, having turn-on voltages of 4.0 V and external quantum efficiencies of 1.40% and 1.25%.