RESONANT RAMAN-SCATTERING AND PHOTOLUMINESCENCE IN ZN1-XCDXSE-ZNSE SUPERLATTICE

The Raman scattering and photoluminescence from a Zn0.76Cd0.24Se-ZnSe Superlattice at room temperature and 77 K have been studied. Two kinds of LO phonon confined modes were observed in detail for the first tim e, they were ascribed to those of ZnSe barrier layers and Zn0.76Cd0.24 Se well layers in the superlattice respectively. Four orders of LO mul ti-phonon modes for well layers, including Stokes and anti-Stokes, and five orders of LO(b) multi-phonon modes for barrier layers were seen clearly at room temperature. At 77 K every order of LO phonon modes sh ifts a little toward lower frequency. Three photoluminescence peaks lo cated at 2.478 eV (19990 cm(-1)), 2.554 eV( 20600 cm(-1))and 2.387 eV (19250 cm(-1)) were observed at room temperature.