Frenkel Exciton Model of Low Temperature Photoluminescence in α-PTCDA Single Crystals
✍ Scribed by R. Scholz; I. Vragović; A.Yu. Kobitski; M. Schreiber; H.P. Wagner; D.R.T. Zahn
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 264 KB
- Volume
- 234
- Category
- Article
- ISSN
- 0370-1972
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✦ Synopsis
Recent studies of the recombination dynamics in a-PTCDA (3, 4, 9, 10 perylene tetracarboxylic dianhydride) with time-resolved photoluminescence (PL) techniques in the 100 ns range have revealed six distinct PL contributions. In the present work, we demonstrate that the PL channel dominating at low temperature (T ¼ 11 K) can be assigned to recombination from an indirect minimum of the dispersion of Frenkel excitons. The approach used is a straightforward extension of previous calculations applied to the linear optical properties of this prototypic molecular semiconductor.