Abstract
Abstract The luminescence spectra of high density excitons in a ZnSe-ZnS strained-layer superlattice (SLS) have been studied in the temperature range 77–250 K. The photoluminescence (PL) spectrum in the SLS usually has only one near edge emission band Es. The Es band is attributed to free exciton recombination following scattering from electrons in the conduction band. According to whether the binding energy of the free exciton increases as the well width of SLS decreases, it can be explained that why it is difficult to observe the separated P band in the ZnSe-ZnS SLS system.
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