Growth of Zn_l-xCd_xSe/ZnSe Superlattices and Study of Stimulated Emission Mechanisms in Blue Light Emissions

Abstract

By using a hot-wall epitaxy method, we have prepared Zn_l-xCd_xSe/ZnSe (x=0.2-0.3) superlattices with the well width of 15-69Å and the barrier width of 40-120 Å. Stimulated emission processes have been studied under high optical excitation intensities in temperature range between 25K and 300K. We find that the exciton-exciton scattering effect is significant in the stimulated emission process. As the exciton density is increased above the Mott transition density, an emission due to the recombination of electron-hole plasmas appears and dominates the emission spectra at room temperature. Stimulated emissions by the phace space filling effect of the excitons have also been measured in the single quantum well structure.