The Effect of LiF in Gd2O3:Eu, Y2O3:Eu, ZrO2:Zn and ZrO2:Er on UV Induced Thermoluminescence

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Abstract
The mixing of LiF in Gd2O3:Eu, Y2O3:Eu, ZrO2:Zn, and ZrO2:Er to fabricate phosphors has been found to have different effects on the UV induced thermoluminescence (TL) of these phosphors. It can greatly enhance the TL intensity of the high temperature peak at 345 oC in Gd2O3:Eu, but the effect on its other TL glow peaks is not so obvious. The mixing of LiF in Y2O3:Eu has also been found to increase intensities of all the TL glow peaks. Sintering temperatures from 1000 oC to 1500 oC of Y2O3:Eu made no difference to the TL intensity of the 380 oC peak. This phenomenon is different from that observed in Y2O3:Eu without mixing of LiF sintered in the same temperature range. The TL intensity of the 205 oC peak has been found to increase, but that of the other peaks was suppressed when LiF was mixed with ZrO2:Zn. The intensity of all TL peaks in ZrO2:Er was greatly reduced by adding LiF. It was found that the effect of LiF on all these phosphors simply changes the TL intensity but not the temperatures of these peaks.

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