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• W2043113350 abstract "To investigate the power rate of nonradiative relaxation to radiative relaxation following the sub-gap excitation, we have observed an absorptance A and photo-acoustic signal coefficient P from 0.4 to 2.0 eV in polythiophene and poly(3-methylthiophene) films. Broad absorption peaks due to (bi)polaron states are observed in absorptance spectra. Spectra P/A and 1-P/A give the conversion rate of the absorbed power to phonons and to luminescence, respectively. To confirm this model, we have observed photo-luminescence spectra from 0.5 to 0.65 eV in poly(3-methylthiophene) films under excitation at 0.93 eV. From these features we conclude that there exists a long-lived excited electron in(bi-)polaron and hole pair states which can make radiative recombination. We propose a powerful tool in which a combination of photo-acoustic and absorptance spectra can determine the conversion rate of the absorbed energy to nonradiative and radiative decays in optically very thin films." @default.
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• W2043113350 date "1997-08-01" @default.
• W2043113350 modified "2023-09-26" @default.
• W2043113350 title "A method to determine the rate of nonradiative relaxation to radiative relaxation following sub gap photo excitation in polythiophene and poly(3-methylthiophene) films" @default.
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• W2043113350 doi "https://doi.org/10.1016/s1350-4495(97)00026-1" @default.
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