UV induced thermoluminescence in ZrO2doped by Er2O3

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Abstract
The ultraviolet induced thermoluminescence in sintered ZrO2 doped by Er2O3 and the origins of the luminescence centre and trapping centre of sintered ZrO2 have been studied. The intensity of the 85 degrees C or the 90 degrees C thermoluminescence peak for ZrO2 doped with Er2O3 was 1.7 times higher than an undoped sample. We assumed that the electron trapping centre for the 90 degrees C thermoluminescence peak of ZrO2 is formed from a Zr ion and an oxygen vacancy. For the 210 degrees C thermoluminescence peak, we assumed that the electron trapping centre is formed from a Zr ion and a defect complex which is formed from an oxygen vacancy and a Zr ion with an electron attached to it. The origin of the luminescence centre is suggested to be associated with the oxygen vacancy and the Ti ion in an asymmetrically sevenfold coordination of ZrO2 in the monoclinic phase. To estimate the trap depths we have proposed a HHe2+ like model which describes the trap depth as an electron trapped by an effective positive electronic charge localized on an oxygen site and perturbed by two effective positive electronic charges localized on a cation site.

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