Suppressed concentration quenching and tunable photoluminescence in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2) phosphors for full-spectrum lighting  

作　　者：Ming Zhao Yeping Ge Yurong Li Xiaoyan Song Zhiguo Xia Xinping Zhang 

机构地区：[1]Institute of Information Photonics Technology,School of Physics and Optoelectronic Engineering,Beijing University of Technology,Beijing 10083,China [2]College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,Beijing 10083,China [3]State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices,School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510641,China

出　　处：《Light(Science & Applications)》2024年第11期2688-2698,共11页光（科学与应用)（英文版）

基　　金：supported by the National Natural Science Foundations of China(52202160);Beijing Municipal Natural Science Foundation(2232041);National Key R&D Program of China(2023YFB3507900);China Postdoctoral Science Foundation(BX20220027,2021M700298);Beijing Postdoctoral Research Foundation(2022-ZZ-065);Chaoyang District Postdoctoral Research Foundation(2022ZZ-015);Beijing University of Technology“Urban Carbon Neutral”Science and Technology Innovation Foundation。

摘　　要：Highly efficient inorganic phosphors are desirable for lighting-emitting diode light sources,and increasing the doping concentration of activators is a common approach for enhancing the photoluminescence quantum yield(PLQY).However,the constraint of concentration quenching poses a great challenge for improving the PLQY.Herein,we propose a fundamental design principle by separating activators and prolonging their distance in Eu^(2+)-activated Rb_(3)Y(PO_(4))_(2)phosphors to inhibit concentration quenching,in which different quenching rates are controlled by the Eu distribution at various crystallographic sites.The blue-violet-emitting Rb_(3)Y(PO_(4))2:xEu(x=0.1%–15%)phosphors,with the occupation of Rb1,Rb2 and Y sites by Eu^(2+),exhibit rapid luminescence quenching with optimum external PLQY of 10%due to multi-channel energy migration.Interestingly,as the Eu concentration increases above 20%,Eu^(2+)prefer to occupy the Rb1 and Y sites with separated polyhedra and large interionic distances,resulting in green emission with suppressed concentration quenching,achieving an improved external PLQY of 41%.Our study provides a unique design perspective for elevating the efficiency of Eu^(2+)-activated phosphors toward high-performance inorganic luminescent materials for full-spectrum lighting.

关 键 词：QUENCHING LIGHTING concentration 

分 类 号：TN31[电子电信—物理电子学]