Free Exciton Luminescence in ZnCdSe Solid Solutions, ZnSe Epitaxial Films and ZnSe1-xSx/ZnSe1-ySy Superlattices
L.N. Tenishev, S.A. Permogorov, D.L. Fedorov
A.F. Ioffe Physical-Technical Institute, Polytechnicheskaya 26, St. Petersburg, 194021, Russia

G.G. Yakushcheva and P.I. Kuznetsov
Institute of Radioengineering and Electronics, Russian Academy of Sciences, Vvedensky 1, Fryazino, Moscow Region, 141120, Russia
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We studied the luminescence of bulk Zn1-xCdxSe solid solutions, epitaxial ZnSe films and ZnSe1-xSx/ZnSe1-ySy superlattices at T=2-80 K. The analysis of the bands of exciton radiative annihilation with simultaneous emission of 1 or 2 LO phonons shows that the excitons in the studied samples can be considered as free particles with thermalized distribution of kinetic energies. In ZnSe1-xSx/ZnSe1-ySy superlattices a three-dimensional character of exciton motion was established. The periodic potential of superlattice perturbs the exciton wave vector and induces additional elastic scattering of excitons.
DOI: 10.12693/APhysPolA.90.959
PACS numbers: 78.20.Ci