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We present evidence for the localization effect of photogenerated carriers in a regular block copolymer made of alternating sequences of thiophene and phenylene rings due to the presence of energy barriers which confine the excitations. Photoinduced (both in the visible and in the infrared regions) and Raman spectra have been studied in dependence of the degree of polymerization of the chains. They...
The suppression of the collective excitations in a novel form of quinquithienyl prevents charge photoproduction and evidences the spectroscopical properties of the isolated molecules in their planar form. The strong reduction of the photoluminescence quantum yield and the non-exponential decay of the photoluminescence in the aggregated molecules are accounted for in terms of exciton dynamics.
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