Direct observation of the suppression of the Auger effect on shallow donors by the magnetic field in the luminescence of manganese ions in semiconducting CdF_{2}:Mn crystals is presented. The magnetic field decreases the probability of the Auger effect, which is spin-dependent energy transfer from the manganese ions to the electrons occupying shallow donors. This results in the increase in the decay times of the luminescence.
The synthetic ZnAl_2O_4 spinels doped with Cr^{3+} ions are prepared from ZnSO_4, Al_2(SO_4)_3, and Cr_2(SO_4)_3. The spinel single phase is detected from X-ray diffraction. Luminescence properties of Cr^{3+} in ZnAl_2O_4 were studied by low temperature luminescence and decay measurements. Four luminescence lines at 14570, 14520, 14460, and 14330 cm^{-1} were found to originate from structure distortion and the line at 14175 cm^{-1} - from chromium pairs. The broad emission band at about 13540 cm^{-1} is considered to arise from a new Cr^{3+} center in ZnCr_2O_4.
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.