Full color LEDs with parahexaphenyl and polypyridine based copolymer.

Results are presented of luminescence (PL) and electroluminescence (EL) studies on color variable LEDs based on parahexaphenyl (PHP) and polypyridine (PPy) related polymers and copolymers. In the fabricated bilayer and 3 layer heterostructure EL devices, PPy and poly(pyridyl vinylene phenylene vinylene) (PPyVPV) are used as electron and hole transport layers resp. For ITO/PPyVPV/PHP/PPy/Al EL device, multi-colors emission in the wide range of the visible spectrum from blue (425 nm) to green (530 nm) and near IR (700 nm) were obtained. The optical and elec. characteristics of bilayer and multilayer EL devices are presented and discussed. [on SciFinder(R)]