文献类型：期刊文献

英文题名：Dosimetric and spectroscopic study of LiMgPO₄ doped with Tm³⁺ and Er³⁺

作者：Guo, Jingyuan[1];Jian, Chenxi[2];Zeng, Caixing[1];Xiong, Zhengye[1];Wang, Luyan[1];Zhou, Dongcui[1]

机构：[1]Guangdong Ocean Univ, Sch Elect & Informat Engn, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Fac Chem & Environm Sci, Zhanjiang 524088, Peoples R China

年份：2023

卷号：13

期号：8

起止页码：4949

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000929103600001)、、WOS

基金：This study was supported by the Science and Technology Planning Project of Guangdong Province (2015A020216020); Educational Commission of Guangdong Province (S202010566059); Innovation and Entrepreneurship Training Program for College Students (CXXL2019259) and Start-up Fund for Doctoral Research (060302112102).

语种：英文

外文摘要：Olivine-type phosphate LiMgPO4 doped with rare earth elements is considered a novel dosimetric material with excellent performance that is suitable for thermoluminescence (TL) and optically stimulated luminescence (OSL) measurements. Novel LiMgPO4:Tm,Er samples were synthesized by a high-temperature solid-state reaction method. A detailed study of the TL and OSL of the samples was performed using beta-ray irradiation and X-ray-excited optical luminescence (XEOL) spectroscopy. Density functional theory (DFT) calculations were performed to predict the preferential positions of thulium and erbium, and photoluminescence (PL) spectra and TL 3D spectra were analyzed. The DFT calculation results show that Mg is preferentially replaced by Tm/Er in the LiMgPO4 system. The PL/TL3D/XEOL spectra of the samples are dominated by the characteristic luminescence of Tm3+, and the OSL decay curve of photoluminescence has fast and slow decay components with decay constants of 5 s and 42 s, respectively. The TL and XEOL results show that LiMgPO4:Tm,Er has strong emission signals under different types of radiation rays. The PL/TL3D/XEOL spectral results show that Er3+ has no radiative excitation, but Tm3+ has strong luminescence, such that the sample still emits strong TL and PL signals. Two TL emission peaks occur at approximately 120 degrees C and 300 degrees C, where the high-temperature peak is significantly more intense than the low-temperature peak, promoting the stability of the TL and OSL signals of the samples. The TL curve consists of 6 general TL dynamic peaks. The nonlinear parameters of the TL dose response are R = 0.08 and D-0 = 479 Gy, and the OSL dose response is linear in the range of 0.2-1000 Gy. The TL and OSL signals of the LiMgPO4:Tm,Er phosphor have good repeatability. Therefore, the LiMgPO4:Tm,Er phosphor can be used for radiation dose measurement.