Thermoluminescence Properties and Luminescence Spectrum of LiMgPO4∶Tm3+,Er3+Phosphor
The rare earth doped olivine phosphate LiMgPO4 is considered as a new dosimetric material with ex-cellent properties for thermoluminescence(TL)measurement.A new LiMgPO4∶Tm3+,Er3+phosphor was synthe-sized by high temperature solid state reaction method.The TL properties,photoluminescence(PL)and thermo-luminescence three-dimensional spectra(TL3D)of the samples under β-ray irradiationwere studied in detail.The results show that there are two TL emission peaks at 120 ℃ and 300 ℃,and the intensity of the high tem-perature peak is significantly higher than that of the low temperature peak,which is conducive to the stability of the TL signal.The material also exhibits a strong luminescent signal.At the same time,the TL signal of LiMgPO4∶Tm3+,Er3+phosphorescent powder has good repeatability.According to TL3D spectrum,LiMgPO4∶Tm3+,Er3+have simple luminescence peak shape.Compared with the luminescence of Tm single-doped phos-phor,the addition of Er3+makes the intensity of high temperature peak stronger and inhibits the formation of low temperature shallow trap.In the dose range of 0.2-200 Gy,the material has a good linear dose response.There-fore,LiMgPO4∶Tm3+,Er3+phosphor can be used for radiation dose measurement.
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