ANTI-STOKES LUMINESCENCE IN CHROMIUM-DOPED ZNSE

The results of comprehensive studies of photoluminescence, photolumine scence excitation, electron spin resonance, and photoconductivity of c hromium-doped ZnSe are discussed. It is shown that the blue anti-Stoke s luminescence of ZnSe:Cr is induced by the two-step ionization transi tions of Cr in which the charge state of chromium is changed from 2+ t o 1+ and from 1+ to 2+. We also propose that some cooperative processe s can contribute to excitation of the anti-Stokes luminescence. The Au ger-type energy transfer mechanism of the photoluminescence excitation is discussed.