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The luminescence under X-ray excitation (XL) and the thermostimulated luminescence (TSL) in Al2O3 crystals are studied in the spectral region 2 to 6 eV at temperatures between 80 and 700 K. In crystals treated in reducing atmospheres at high temperatures a luminescence band at 3.0 eV is dominating the XL and TSL spectra. This band is also observed in spectra of neutron-irradiated crystals together with bands at 3.75 and 2.4 eV. In Mg-doped crystals a number of bands are observed peaking at 3.15, 3.75, 4.0, 4.4., and 4.75 eV. The luminescence band at 3.75 eV can be due to F+ centres. The band at 3.0 eV is connected with some donor type defects. In all the crystals studied (except the untreated one) one or both of the main TSL peaks at 225 and 260 K are observed. The first one is ascribed to release of holes, the other to electron release from some donor centres.
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Kūlis et al. (1979) studied this question.
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