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We report the observation and analyze the mechanism of efficient blue anti-Stokes emission in ZnSe:Cr. This emission and the intra-shell transition of chromium Cr 2+ at 2.4μm are induced by 2+->1+ ionization transition of chromium ions in ZnSe:Cr. The efficiency of the anti-Stokes photoluminescence anticorrelates with the efficiency of the infrared emission. The latter emission dominates...
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