Spectral narrowing of photoluminescence and blue light-emitting diodes of poly(phenylene pyridine) derivatives

Optical properties of poly(phenylene pyridine) derivatives, such as optical absorption, photoluminescence (PL) and electroluminescence (EL), have been studied. The electronic energy structures have been determined by optical and electrochemical measurements. High PL quantum efficiency has been estimated in the films, and spectral narrowing has been observed by pulse excitation of a nitrogen laser. Intense blue EL has also been demonstrated.