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

Novel carbazole-containing polymers, i.e., poly(3,6-di- tert -butyl- N - ( p -ethynylphenyl)carbazole) [poly( t -Bu 2 CzPA)] and poly( N - ( p -ethynylbenzoyl)carbazole) [poly(CzCOPA)] were synthesized by the polymerization of the corresponding carbazole-containing acetylene monomers using [(norbornadiene)RhCl] 2 −Et 3 N, WCl 6 − n -Bu 4 Sn, and WCl 4 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 -Bu 2 CzPA) was 55%, while that of the Rh-based one was as low as 3.6%. The photocurrent of poly( t -Bu 2 CzPA) was 40−50 times higher than the dark current. Poly( t -Bu 2 CzPA) in conjunction with iridium complexes exhibited electroluminescence (13−18 cd/m 2 ).