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E. Engel, M. Koschorreck, K. Leo, M. Hoffmann, Ultrafast Relaxation in Quasi-One-Dimensional Organic Molecular Crystals Phys. Rev. Lett. 95 (2005), 157403. | |
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| Abstract | |
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We present a comprehensive study of ultrafast relaxation properties of optical excitations in thin films
of quasi-1D stacked organic materials PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) and
MePTCDI (N,N' dimethylperylene-3,4,9,10-dicarboximide) over five decades of time. Pump-probe
experiments reveal excitonic intraband relaxation time constants of 65 fs for MePTCDI and 100 fs for
PTCDA. The initial time-resolved luminescence anisotropy is consistent with the exciton model of
Davydov-split states. The subsequent decay of the anisotropy can be explained with a thermally activated
exciton hopping process. A full understanding of the pump-probe experiments calls for an explanation
beyond the models presently available.
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| DOI:10.1103/PhysRevLett.95.157403 (direct link to publisher) | |
| pdf file of manuscript version | |
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homepage M. Hoffmann | |
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| last updated: M. Hoffmann, Dec 2007 |