Gradient defects mediate negative thermal quenching in phosphors

查看全文 作　　者：Mingxue [1,2]Deng;Xingzhong [3]Cao;Yangmin [1,2]Tang;Zhenzhen [1]Zhou;Lijia [4]Liu;Xiaofeng [5]Liu;Peng [3]Zhang;Lo-Yueh [6]Chang;Hao [7]Ruan;Xinjun [7]Guo;Jiacheng [1,2,8,9]Wang;Qian [1,2]Liu

机构地区：[1]Chinese Academy of Sciences,Shanghai Institute of Ceramics,State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai,China;[2]University of Chinese Academy of Sciences,Center of Materials Science and Optoelectronics Engineering,Beijing,China;[3]Chinese Academy of Sciences,Institute of High Energy Physics,Beijing,China;[4]Western University,Department of Chemistry,London,Ontario,Canada;[5]Zhejiang University,School of Materials Science and Engineering,Hangzhou,China;[6]Taiwan Synchrotron Radiation Centre,Hsinchu,China;[7]Chinese Academy of Sciences,Shanghai Institute of Optics and Fine Mechanics,Laboratory of Micro-Nano Optoelectronic Materials and Devices,Shanghai,China;[8]North China University of Science and Technology,College of Materials Science and Engineering,Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials,Tangshan,China;[9]Taizhou University,School of Materials Science and Engineering,Taizhou,China

出　　处：《Advanced Photonics》索引2023年第5卷第2期,共12页

基　　金：the National Key Research and Development Program of China(Grant No.2018YFB0704103);the Natural Science Foundation of Shanghai(Grant Nos.22ZR1472100 and 20ZR1465900);the National Natural Science Foundation of China(Grant Nos.92163117 and 62175210);the State Key Laboratory of ASIC&System(Grant No.2020KF002);the Innovation Project of Shanghai Institute of Ceramics(Grant No.E21ZC1770G);L.L.thanks the Taiwan Light Source for technical support.J.W.thanks the Program of Shanghai Academic Research Leader(Grant No.20XD1424300)for financial support.The authors thank Professor Zhijun Zhang for providing valuable assistance in stress luminescence testing. 摘　　要：Luminescent materials often suffer from thermal quenching(TQ),limiting the continuation of their applications under high temperatures up to 473 K.The formation of defect levels could suppress TQ,but rational synthesis and deep understanding of multiple defects-regulated luminescent materials working in such a wide temperature range still remain challenging.Here,we prepare a negative thermal quenching(NTQ)phosphor LiTaO_(3)∶Tb^(3+)by introducing gradient defects V_(Ta)^(5−),Tb_(Li)^(2+),and(V_(Ta)Tb_(Li))^(3−)as identified by advanced experimental and theoretical studies.Its photoluminescence significantly becomes intense with rising temperatures and then slowly increases at 373 to 473 K.The mechanism studies reveal that gradient defects with varied trapping depths could act as energy buffer layers to effectively capture the carriers.Under thermal disturbance,the stored carriers could successively migrate to the activators in consecutive and wide temperature zones,compensating for TQ to enhance luminescence emission.This study initiates the synthesis of multi-defect NTQ phosphors for temperature-dependent applications. 关键词：gradient defects negative thermal quenching energy buffer layers temperature-dependent information encryption

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Gradient defects mediate negative thermal quenching in phosphors

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