L.V. Borkovska, M.Ya. Valakh, E.F. Venger, Yu.G. Sadofyev, N.O. Korsunska, V.V. Strelchuk, G.N. Semenova, M.V. Vuychik

This paper presents the results of photoluminescence and Raman scattering investigations of CdSe/ZnSe nanostructures. Using resonant excitation of Cd-containing nanoislands both Stokes and anti-Stokes emission are observed. The mechanism of anti-Stokes luminescence, including two-photon two-step excitation through the local states of defects and quantized states of islands, is proposed. The inhomogeneous broadening of the photoluminescence band is shown to be largely due to the size distribution of islands and/or to the variation of their Cd-content.