Influences of Interchain Interaction on Exciton Dynamics in Poly(3-alkylthiophene) : Atoms, Molecules, and Chemical Physics

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Luminescent conjugated polymers, poly(3-alkylthiophene) (PAT) with alkyl side chains of different lengths have been studied using time-resolved photoluminescence (PL) spectroscopy. PL characteristics in polymer films of PAT with along alkyl side chain are found to depend on the preparation methods of the films, namely spin coating and casting methods. The PL spectrum of the cast film is red shifted with respect to that of the spin-coated film. PL decays of both films follow single exponential function. However, it is found that the cast film has alonger PL life time with a lower PL efficiency in comparison to the spincoated film. PL characteristics are also found to depend on the length of the side chains. In PAT with a short alkyl side chain, PL decay does not follow a simply single exponential function, but obeying a suppressed-exponential function. PL lifetime and quantum efficiency increase with increasing length of the side chains. The experimental results have been discussed by taking the interchain interaction as the result of the exciton dissociation at strongly interacted chains and the formation of nonemissive interchain species such as polaron pairs into consideration.
社団法人応用物理学会の論文
2001-12-15