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Excitation density dependent luminescence spectra of the thick ZnO layer at . The free and the impurity bound excitons , , , , and as well as the excited state are marked with vertical lines.
Time delayed cathodoluminescence spectra at for an in-pulse excitation density corresponding to in Fig. 1.
(Color online) Transients taken at the spectral position of , , , , , and , respectively. The arrows mark the time positions of the time delayed spectra in Fig. 2.
Numerical fits of the transients recorded at the spectral position of , , , , , and , respectively. The inset lists the resulting time constants.
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