Frenkel exciton model of low temperature photoluminescence in alpha-PTCDA single crystals

摘要

Recent studies of the recombination dynamics in alpha-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 = 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. [References: 27]