MIXING LIF IN GD2O3-EU TO ENHANCE ULTRAVIOLET-RADIATION INDUCED THERMOLUMINESCENT SENSITIVITY AFTER SINTERING PROCESS

It has been found that mixing of LiF in Gd2O3:Eu phosphor then sinteri ng at 1200 degrees C for 4 h can greatly enhance its sensitivities bot h in ultraviolet (UV) radiation induced thermoluminescence (TL) and ph otoluminescence (PL). Both cubic (C-type) and monoclinic (B-type) crys talline structures were observed in Gd2O3:Eu phosphor, but only cubic crystalline structure has been found when this phosphor was mixed with LiF, after sintering. Some UV radiation induced TL and PL characteris tics have been compared in Gd2O3:Eu phosphors, mixed with and without LiF, to confirm the role of LIF in this phosphor. The role of LiF inGd (2)O(3):Eu phosphor was to promote the incorporation of Eu2O3 into Gd2 O3 more completely during sintering.