Comparison of Microscopic Mechanisms of Blue Anti-Stokes Luminescence in Undoped and Chromium Doped ZnSe Crystals
V.Yu. Ivanova, A. Omel'chukb and M. Godlewskia
aInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
bDepartment of Physics, University of Dnepropetrovsk, 320625, Dnepropetrovsk, Ukraine
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Anti-Stokes luminescence is observed in chromium doped and in undoped ZnSe crystals. In the former case anti-Stokes luminescence is due to two complementary ionization transitions of Cr ions. In the latter case two-photon absorption becomes important at a high excitation density.
DOI: 10.12693/APhysPolA.94.365
PACS numbers: 71.55.Gs, 78.55.Et, 76.30.Fc