Abstract
Thermally stimulated luminescence (TSL) spectra in the 313–580K temperature range have been studied in anion-defective alumina crystals (named in literature as Al2O3:C) exposed to different irradiation doses. The TSL curve features two peaks with the maxima at Tm1=437K and Tm2=565K. The TSL spectrum of the first peak contains the emission of F centers and the R line of Cr3+ impurity ions. The absence of the emission of F+ centers indicates that electron traps are responsible for the first dosimetric TSL peak. The TSL spectrum of the second peak features emission bands of F, F+ centers, R line as well as a wide band centered at 550nm and associated with the formation of aggregate centers (F2 and F22+) under irradiation. Possible excitation mechanisms of the TSL emission bands that involve both electron and hole traps related to anion vacancies and impurities are discussed.
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