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- W2040612132 abstract "We study exciton migration in low molecular weight poly[3-(2,5-dioctylphenyl)thiophene] in dilute solution by means of ultrafast spectroscopy and Monte Carlo simulations of resonance energy transfer using the line-dipole Förster approach. The model includes the build-up of polymer chains, site-selective exciton generation, and diffusion through incoherent energy transfer. Time-resolved, ensemble-averaged experimental data are reproduced, namely photoluminescence spectral migration and stimulated emission anisotropy decays measured by streak camera and femtosecond transient absorption spectroscopy under site-selective excitation conditions. Importantly, the relatively simple line-dipole Förster-type approach beyond the point-dipole approximation reproduces both experiments quantitatively. Since explicit chain conformations are used in the model, the simulations yield a descriptive microscopic picture of exciton migration. The effective conjugation length (lseg=2.9nm, 7.4 monomer units) and the disorder of the chains (Ω=0.8) are yielded as the only fitting parameters. We find an extra component that is not covered by our fits in anisotropy decays at early times for high excitation energies. This is interpreted within the context that the effective conjugation is limited by conformational disorder." @default.
- W2040612132 created "2016-06-24" @default.
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- W2040612132 date "2005-02-24" @default.
- W2040612132 modified "2023-10-17" @default.
- W2040612132 title "Exciton migration in a polythiophene: Probing the spatial and energy domain by line-dipole Förster-type energy transfer" @default.
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- W2040612132 doi "https://doi.org/10.1063/1.1855292" @default.
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