Kinetics of Photoluminescent Excitons in Polythiophene Films during Electrochemical Doping

Migration of photoinduced excitons has been studied from the quenching of photo-luminescence during in situ electrochemical doping in conducting polythiophene and poly(3-methylthiophene) films. An analysis based on one-dimensional model gives an average migration distance of the excitons about 35 thiophene rings during their lifetimes. The results indicate that an aggregation of dopants follows the uniform doping, being consistent with the model of polaron and bipolaron formations.

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