There has been significant interest in the development of wide band gap conjugated polymers for application in light-emitting diodes both as blue emitters as weII as hosts for lower band gap fluorophores and phosphorescent dyes. Previous work has seen the development route to two families of carbazole main chain conjugated polymers which have been alklated at the 9 position of the carbazole ring in an aid to improve solubility and process ability of these compounds. The carbazole repeat units have either been polymerised through the 2,7-positions giving poly(9-alkyl-carbazole-2,7diyl) s or the 3,6 positions giving poly(9-alkyl-carbazole-3,6-diyl)s. These polymers have shown quantum efficiencies of