Abstract
The near-band-edge emission of cubic zinc sulfide single crystals has been studied in detail by steady-state photoluminescence (PL) and time-resolved photoluminescence. Based on the peak energy positions, excitation power density and temperature dependencies of the PL spectra, we interpret the emission as recombination of the free and bound excitons and of the biexcitons. We observed the biexciton emission at 3.791 eV in cubic ZnS single crystals with very low excitation power density. Its binding energy and radiative lifetime were determined to be about 9 meV and 52 ps at 12 K, respectively.
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