Svnthesis and ODW-electrical prperties of dendron-containing poly(2,3-diphenyl-1,4-phenylenevinylene) derivatives

Abstract

A new series of poly(2,3-diphenyl-1,4-phenylenevinylene) derivatives containing dendritic side groups were synthesized. Different generations of dendrons were integrated on the pendant phenyl ring to investigate their effect on optical and electrical properties of final polymers. Homopolymers can not be obtained via the Gilch polymerization because of sterically bulky dendrons. By controlling the feed ratio of different monomers during polymerization, dendron-containing copolymers with high molecular weights were obtained. The UV-vis absorption and photoluminescent spectra of the thin films are pretty close; however, quantum efficiency is significantly enhanced with increasing the generation of dendrons. The electrochemical analysis reveals that hole-injection is also improved by increasing dendritic generation. Double-layer light-emitting devices with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al were fabricated. High generation dendrons bring benefit of improved device performance. (c) 2007 Wiley Periodicals, Inc.