Synthesis of Polyacetylenes Having Pendant Carbazole Groups and Their Photo- and Electroluminescence Properties

Abstract

Novel carbazole-containing polymers, i.e., poly(3,6-di-tert-butyl-N-(p-ethynylphenyl)carbazole) [poly(t-Bu2CzPA)] and poly(N-(p-ethynylbenzoyl)carbazole) [poly(CzCOPA)] were synthesized by the polymerization of the corresponding carbazole-containing acetylene monomers using [(norbornadiene)RhCl]2−Et3N, WCl6−n-Bu4Sn, and WCl4 catalysts. The UV−vis absorption band edge wavelengths of the polymers obtained by the polymerization with W catalysts were longer than those of the Rh-based polymers. The photoluminescence quantum yield of the W-based poly(t-Bu2CzPA) was 55%, while that of the Rh-based one was as low as 3.6%. The photocurrent of poly(t-Bu2CzPA) was 40−50 times higher than the dark current. Poly(t-Bu2CzPA) in conjunction with iridium complexes exhibited electroluminescence (13−18 cd/m2).