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High Charge Carrier Storage Capacity in Lithium Lutetium Silicate Doped with Cerium and Thulium
摘要： It is demonstrated that LiLuSiO4:Ce,Tm has excellent charge carrier storage properties. Comparative studies are performed with the state-of-the art X-ray storage phosphor BaFBr(I):Eu. The thermoluminescence (TL) intensity of the optimized LiLuSiO4:Ce,Tm is four times higher than the TL of BaFBr(I):Eu. After 3 h of storage at room temperature (RT) there is still 94% of initial thermoluminescence and only 48% for BaFBr(I):Eu which demonstrates insignificant thermal fading. The signal can be read out by a blue LED and less efficiently by a red laser. It does require higher stimulation energy than in the case of BaFBr(I):Eu. The self-irradiation with a dose rate of 13 mGy h due to 176Lu isotopes is not a serious drawback for application.
关键词： storage phosphors,thulium,cerium,traps,thermoluminescence,fading,self-irradiation
更新于2025-09-23 15:21:01
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On thermoluminescence mechanism and energy leakage in Lu2O3:Tb,V storage phosphor
摘要： The energy storage properties of Lu2O3:Tb,V sintered materials when exposed to X-rays were investigated for the first time using a number of thermoluminescent techniques. Thermoluminescence was generated exclusively by the Tb3+ ions, which served also as hole-trapping centers. Two TL peaks at ～170 °C and 220 °C were found to be directly connected with V-electron traps and were assigned to the release of first (170 °C) and second (220 °C) electron from VX Lu. It was evidenced that each of the two TL bands results from strongly overlapping components showing continuous distribution of energies. Significant contribution from semi-localized transitions to carriers annihilation was also proved.
关键词： Storage phosphors,Continuous distribution of trap energy,Lutetium oxide,Semi-localized transition model
更新于2025-09-19 17:15:36