New conjugated ladder polymer containing carbazole moieties

A new ladder polymer incorporation a polar carbazole group within the main chain, ladder-type poly(para-phenylene carbazole), LPPPC, was synthesized and characterization by luminescence techniques. Its properties are compared to that of the well-known methyl-substituted ladder-type poly(para-phenylene), MeLPPP. The results obtained evidence a very low energetic disorder in this new polymer, presumably due to its near-perfect intrachain structure and low content of defects. It was found that although the density of states (DOS) distribution for neutral excitations is narrower than in MeLPPP, the manifold of charge-transporting localized states is substantially more energetically disordered due to important dipolar disorder contributions.