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- W2006136475 abstract "The radiative recombination channels in α-PTCDA are analysed with time-resolved PL techniques in the 50 ns range between temperatures of T=10 and T=300 K. The resulting PL spectra are interpreted with calculations based on the transfer of Frenkel excitons and with time-dependent density functional theory applied to different deformed geometries of molecular dimers as microscopic models for self-trapped excitons. At low temperature, the lineshape and radiative lifetime of the most important PL channel can be assigned quantitatively to a vertical transition from the indirect minimum of the Frenkel exciton dispersion towards the electronic ground state. In an intermediate regime below about T=100 K, charge transfer states involving an anionic and a cationic molecule dominate the PL spectra. Radiative recombination from an excimer state in a stack geometry has a rather weak temperature dependence, and due to non-radiative quenching of the other PL channels, this excimer PL band predominates above about T=200 K." @default.
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- W2006136475 date "2004-03-01" @default.
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- W2006136475 title "Time-resolved photoluminescence in $alpha;-PTCDA single crystals: evidence for recombination via Frenkel excitons, charge transfer states, and excimers" @default.
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- W2006136475 doi "https://doi.org/10.1016/j.orgel.2004.03.001" @default.
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