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gradient defects mediate negative thermal quenching in phosphors

Advanced Photonics 2023年第2期5卷 34-45页

作者： Mingxue Deng Xingzhong Cao Yangmin Tang Zhenzhen Zhou Lijia Liu Xiaofeng Liu Peng Zhang Lo-Yueh Chang Hao Ruan Xinjun Guo Jiacheng Wang Qian Liu Chinese Academy of Sciences Shanghai Institute of CeramicsState Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghaiChina University of Chinese Academy of Sciences Center of Materials Science and Optoelectronics EngineeringBeijingChina Chinese Academy of Sciences Institute of High Energy PhysicsBeijingChina Western University Department of ChemistryLondonOntarioCanada Zhejiang University School of Materials Science and EngineeringHangzhouChina Taiwan Synchrotron Radiation Centre HsinchuChina Chinese Academy of Sciences Shanghai Institute of Optics and Fine MechanicsLaboratory of Micro-Nano Optoelectronic Materials and DevicesShanghaiChina North China University of Science and Technology College of Materials Science and EngineeringHebei Provincial Key Laboratory of Inorganic Nonmetallic MaterialsTangshanChina Taizhou University School of Materials Science and EngineeringTaizhouChina

Luminescent materials often suffer from thermal quenching(TQ),limiting the continuation of their applications under high temperatures up to 473 *** 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 ***,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 *** photoluminescence significantly becomes intense with rising temperatures and then slowly increases at 373 to 473 *** mechanism studies reveal that gradient defects with varied trapping depths could act as energy buffer layers to effectively capture the *** thermal disturbance,the stored carriers could successively migrate to the activators in consecutive and wide temperature zones,compensating for TQ to enhance luminescence *** 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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