Thermoluminescence of ZrO2 doped with Er2O3 induced by ultraviolet and x-ray radiation

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Abstract
This work investigates the thermoluminescent (TL) glow of Er 2 O 3 -doped ZrO 2 sample, after separate irradiation with UV and synchrotron x-rayradiations. Experimental results indicate that, in addition to a major TL peak at 98 °C and a minor one at 205 °C, another minor peak appears at 135 °C. The intensity of two minor peaks, particularly the one at 135 °C, increases rapidly with the photon energy. Initial rise method is used to obtain the activation energies of 0.96 and 0.99 eV for 135 and 205 °C TL peaks, respectively. Moreover, the trap depth is theoretically estimated by invoking a HHe +2 like model in which an electron is trapped by an effective positive charge localized on an oxygen site but perturbed by two effective positive charges localized on a cation site. Derived theoretical trap depths, 0.95 and 0.97 eV, are in excellent agreement with experimental values.