Full color LEDs with parahexaphenyl and polypyridine based copolymer

This work presents results of photoluminescence (PL) and electroluminescence (EL) studies on color variable light emitting devices (LEDs) based on parahexaphenyl (PHP) and polypyridine (PPy) related polymers and copolymers. In the fabricated bilayer and three layer heterostructure EL devices, PPy and poly(pyridyl vinylene phenylene vinylene) (PPyVPV) are used as electron and hole transport layers respectively. 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 infrared (700 nm) were obtained. The optical and electrical characteristics of bilayer and multilayer EL devices are presented and discussed.