Synthesis and characterization of polythiophene derivatives containing electron transporting and hole transporting moieties

Novel luminescent copolymers, poly(3-(2-benzotriazoloethyl)thiophene-co-octylcarbazolylene) ([(BET)(m)-OcCz(2)](n)) that contain both electron transporting benzotriazole and hole transporting octylcarbazole moiety were synthesized by oxidation of ferric chloride with changing the composition ratio of BET and OcCz. The absorption peak of UV-VIS was blue-shifted from lambda (max)=440 nm in poly(3-(2-benzotriazoloethyl)thiophene) (PBET) to lambda (max)=412 nm in [(BET)(4)-OcCz(2)](n). The photoluminescence (PL) and electroluminescence (EL) intensities of the polymers were decreased with presence of carbazole moieties in the copolymer.