Influence of Y3+-doping on thermoluminescence of PbWO4

The authors studied the thermoluminescence of pure PbWO4 and PbWO4:Y above room temperature (30 degree C-300 degree C). The authors found that Y3+-doping reduces the intensity of thermoluminescence of PbWO4 and moves the peaks of thermoluminescence to higher temperature after γ-ray irradiation about 1 Mrad dose, which can improve the stability of PbWO4 luminescence. The authors also calculated the parameters of the traps, namely the depth of traps, frequency factor and the time of release from the traps at 300 K. visible light can also influence thermoluminescence. The intensity of thermoluminescence below 240 degree C increased after blue and green illumination for all samples. Furthermore, visible light can induce new thermoluminescence peaks in some samples, which is caused either by that the carriers released by visible light are subsequently re-traped by some shallower traps, or the visible light illumination may possibly create new types of traps