Both photo luminescent (PL) and electroluminescent (EL) properties of 6,6''
''-dimethyl-4',4-'''diphenyl-2,2':6',2 " :6 " ,2''':6''',2''''-quinquepyrid
ine (DMDPQPY), a derivative of quinquepyridine, have been investigated. Its
solution in CHCl3 emits with only one maximum at 365 nm, but an additional
new emission peak appears at 553 nm in the PL spectrum of its film prepare
d through vacuum evaporation. Only weak EL emission can be observed from ty
pical single-layer devices, but introduction of a hole-transporting layer p
olyvinylcarbazole (PVK) in the double-layer devices results in significant
enhancement of the luminance. Both PVK and DMDPQPY emit in the double-layer
devices. (C) 2001 Elsevier Science B.V. All rights reserved.