Two high-performance blue-violet-emitting organic electroluminescent device
s 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-methyl
phenyl)-N,N-'-diphenyl-[1,1'-biphenyl]-4,4'-diamine and N,N-'-di(4-biphenyl
yl)-N,N-'-diphenyl-[1,1'-biphenyl]-4,4'-diamine. The devices show maximum l
uminaces 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%.
(C) 2001 American Institute of Physics.