Abstract
An analytical model describing the low-temperature tunneling dynamics of excitons in disordered systems is proposed, reproducing the time-resolved photoluminescence (TRPL) line shape and the temporal red-shift of the TRPL maximum of localized excitons in detail. Assuming a Gaussian energy distribution of the localized states, the observed asymmetric spectral line shape can be interpreted as the distribution of the lowest states within a certain tunneling volume. Using (Mg,Zn)O and Cd(S,Se) as model systems, the number of reachable states is determined from the time dependence of the photoluminescence signal and the density of localized states is estimated. For (Mg,Zn)O, we also reveal the exciton capture at donors and its influence on the TRPL transients.
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