Multiphonon relaxation in ZnSe/ZnCdSe superlattice

The photoluminescence (PL) and resonant Raman scattering (RRS) spectra of m ultiple quantum well (MQW) structures are investigated at room temperature. The spectra of Raman scattering consist of intensive band of the quantum w ells luminescence and additional narrow bands. The energy shift of these ad ditional bands was equal to the multiple value of longitudinal oscillation phonon of the strained ZnSe barriers. The intensity of these bands is reson ance amplified at approaching the excitation radiation frequency to MQW lum inescence bands frequency. We suppose that the given process consists of se veral stages: absorption of stimulating light by quantum wells; exchange of energy between hot electrons and barriers; relaxation of system including longitudinal phonon generations in barriers. (C) 2000 Elsevier Science B.V. All rights reserved.