Tunable electronic band structure,luminescence properties and thermostability of (Gd1-xLax)2Si2O7∶Ce scintillator by adjusting La/Gd ratio

• 作者: Qinhua Wei Zhenzhen Zhou Weijie Zhang Gao Tang Qian Liu Laishun Qin Hongsheng Shi
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: SPECTROSCOPY, LUMINESCENCE AND PHOSPHORS
• 页码范围: 657-665
• 页数: 9页
• 语种: 英文

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 Gd2Si2O7∶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 5dr level of Ce3+ shifts to higher energy as the La content increases.The luminescence thermo-stability and activation energy were also measured and calculated.It indicates that thermo-stability is strongly dependent on the La con-centration.An effective approach is developed to tune the electronic band structure,luminescence properties and thermostability of (Gd1-xLax)2Si2O7∶Ce scintillator by adjusting La/Gd ratio.