Tunable electronic band structure,luminescence properties and thermostability of(Gd_(1-x)La_(x))_(2)Si_(2)O_(7):Ce scintillator by adjusting La/Gd ratio

查看全文 作　　者：Qinhua [1]Wei;Zhenzhen [2]Zhou;Weijie [1]Zhang;Gao [1]Tang;Qian [2]Liu;Laishun [1]Qin;Hongsheng [3]Shi

机构地区：[1]College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,China;[2]State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;[3]Xinjiang Technical Institute of Physics&Chemistry,Chinese Academy of Sciences,Urumqi 830011,China

出　　处：《Journal of Rare Earths》索引2021年第39卷第6期,共10页

基　　金：Project supported by the National Natural Science Foundation of China(11975220,51972291);the National Key Research and Development Program of China(2016YFB0700204);Natural Science Foundation of Shanghai(16ZR1441100)。 摘　　要：Mixed crystal strategy is an effective approach of improving the luminescence properties of optical materials and has been adopted widely in many systems.In this paper,the La-mixed Gd_(2)Si_(2)O_(7):Ce polycrystalline samples were successfully synthesized by a sol-gel method.The crystal structure and luminescence properties were confirmed and discussed by XRD,UV-Vis luminescence spectra,and XEL,respectively.The vacuum ultraviolet excitation spectra and thermoluminescence glow curves were also systematically investigated and discussed at varied temperature.A combination of the first-principles calculations and optical characterization experiments was employed to study the electronic band structure of host material,revealing that the band gap is narrowed and the 5d_(1) level of Ce^(3+) shifts to higher energy as the La content increases.The luminescence the rmo-stability and activation energy were also measured and calculated.It indicates that thermo-stability is strongly dependent on the La concentration.An effective approach is developed to tune the electronic band structure,luminescence properties and thermostability of(Gd_(1-x)La_(x))_(2)Si_(2)O_(7):Ce scintillator by adjusting La/Gd ratio. 关键词：First-principles calculations Scintillator (Gd_(1-x)La_(x))_(2)Si_(2)O_(7):Ce Band structure tunable Luminescence properties Rare earths

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Tunable electronic band structure,luminescence properties and thermostability of(Gd_(1-x)La_(x))_(2)Si_(2)O_(7):Ce scintillator by adjusting La/Gd ratio

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