The light emitting properties of ZnS/ZnSe and ZnSTe/ZnSe strained II–VI superlattices are investigated. Room-temperature stimulated emission by photopumping in the deep-blue spectral region is observed. An upper limit of threshold carrier density required to achieve lasing is estimated to be 3×1018/cm3.The peak of stimulated emission is several tens of meV red shifted from the spontaneous emission peak, suggesting that exciton-exciton scattering is involved in the stimulated emission process.
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Wang et al. (1995) studied this question.
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