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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.

acta physica polonica. a

Free Exciton Luminescence in ZnCdSe Solid Solutions, ZnSe Epitaxial Films and ZnSe1-xSx/ZnSe1-ySySuperlattices