Thermoluminescence from Ultraviolet Exposed MgAl2O4

Three-dimensional thermoluminescence (TL) spectra from ultraviolet exposed MgAl2O4 were measured over the temperature range of 300 K-600 K and the wavelength range of 300 nm-800 nm. Emission bands of all spectra at their peak temperature are centred at 520 nm and 710 nm associated with the holes captured at V2+ and Cr2+ sites, respectively. Dose dependence of the peak temperature and the full width at half maximum are different for each emission wavelength. Up to 2000 s, the TL intensity increases linearly as UV exposure time increases, and above that, the saturation of the TL intensity appears. (author)