Optical and electrical properties of poly (phenylene pyridine) derivatives

Optical properties of poly(2,5-dialkoxy-1,4-phenylene-alt-2,5-pyridine) (PHOnPY25), such as optical absorption, photoluminescence (PL) and electroluminescence (EL), have been studied. The electrochemical characteristics such as the spectral change of PHOnPY25 by electrochemical doping have also been studied. Strong blue PL with high quantum efficiency and intense blue EL have been demonstrated in PHOnPY25 with four kinds of side chain length. EL spectrum of PHOnPY25 as well as the absorption and PL spectra has been modulated by electrochemical doping.