Abstract
The results of photoluminescence and magneto-luminescence studies of chromium doped ZnSe crystals are presented for blue colour shallow donor—shallow acceptor pair photoluminescence, with a zero phonon line at 2.692 eV. This donor-acceptor pair photoluminescence is observed under photo-excitation with photon energies smaller than the emission energy . (anti-Stokes luminescence) and dominates in the photoluminescence spectrum of ZnSe : Cr at the excitation energy about 2.41 eV and for temperature T <'20 K. A quantum efficiency of this anti-Stokes luminescence is relatively large. It is of about 10 -3 at 0 T and increases with increasing magnetic field up to 7 T at temperature T = 2 K. We relate the intensity of the anti-Stokes luminescence to a non-equilibrium concentration of photo-excited Cr+ ions and propose that the rate of spin-dependent recombination of Cr+ ions with free holes (decreases with increasing magnetic freld) is responsible for the observed increase in the anti-Stokes luminescence intensity at higher magnetic fields. PACS numbers: 71.55.Gs, 78.55.Et, 76.30.Fc
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