Key role of Nb5+ in achieving water-resistant red emission in K2Ta1-xNbxF7:Mn4+ phosphors |
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| Affiliation: | 1. Guangdong Provincial Key Laboratory of Rare Earth Development and Application, Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou, 510651, PR China;2. School of Information Engineering, Nanyang Institute of Technology, Nanyang, 473004, PR China;3. School of Chemistry, Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, South China Normal University, Guangzhou, 510006, PR China;4. Centre of Excellence for Photoconversion, Vinča Insitute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, P.O. Box 522, Belgrade, 11001, Serbia;5. School of Environmental and Chemical Engineering, Foshan University, Foshan, 528225, PR China;1. Key Laboratory of Electronic Functional Composite Materials of Guizhou Province, College of Big Data and Information Engineering, Guizhou University, Guiyang, 550025, PR China;2. School of Electronic and Communication Engineering, Guiyang University, Guiyang, 550005, PR China;1. Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, PR China;2. Chongqing Sports Medicine Center, Department of Orthopedic Surgery, Southwest Hospital, The Third Military Medical University, Chongqing, 400038, People''s Republic of China;3. School of Robot Engineering, Yangtze Normal University, Chongqing, 408100, PR China;4. MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, CQU-NUS Renewable Energy Materials & Devices Joint Laboratory, School of Energy & Power Engineering, Chongqing University, Chongqing, 400044, China;1. Composites and Nano-Structured Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications, New Borg El-Arab City, P.O: 21934, Alexandria, Egypt;2. Chemistry Department, Faculty of Science, Alexandria University, P.O: 21568, Alexandria, Egypt;1. School of Materials and Energy, Southwest University, Chongqing, 400715, China;2. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, China;1. School of Energy & Environmental Engineering, Hebei Engineering Research Center of Pollution Control in Power System, Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, Tianjin, 300401, PR China;2. Solid Waste and Chemicals Management Center, Ministry of Ecology and Environment, Beijing, 100029, PR China;3. College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin, 300350, PR China;4. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300401, PR China;1. Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Renmin Street NO. 5988, Changchun, Jilin Province, 130025, PR China;2. School of Mechanical and Aerospace Engineering, Jilin University, Renmin Street NO. 5988, Changchun, Jilin Province, 130025, PR China;3. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, PR China |
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| Abstract: | Mn4+-activated fluoride is one of the most important red phosphors for white light-emitting diodes (WLEDs) with high color rendering index (CRI). Due to a lack of water resistance, their potential applications are limited. Although surface coating strategies improve the waterproof stability of fluoride red phosphors, they have downsides. It was found that Nb5+ plays an important role in improving the water resistance of Mn4+-activated oxyfluorides by preventing the hydrolysis of MnF6]2-. In this work, the influence of Nb5+ on the waterproof stability of Mn4+-activated fluorides was explored. A set of synthesized K2Ta1-xNbxF7:Mn4+ phosphors exhibit tunable and superior water resistance. The photoluminescence (PL) intensity of the representative sample K2Ta0.6Nb0.4F7:5%Mn4+ remains nearly 100% of its initial value even after being immersed in water for 60 min, which is significantly higher than the commercial K2SiF6:Mn4+ red phosphor (8.7%). Our findings open up new possibilities for the development of waterproof fluoride red phosphors. |
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