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A single-structured LuAG:Ce,Mn phosphor ceramics with high CRI for high-power white LEDs |
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| Authors: | Junrong Ling Ye Zhang Jian Yang Yanan Li Wentao Xu Youfu Zhou Maochun Hong |
| Affiliation: | 1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China University of Chinese Academy of Sciences, Beijing, China;2. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China;3. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, P. R. China Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, China;4. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, P. R. China |
| Abstract: | The realization of high color rendering index (CRI) is still a great challenge for high-power LEDs (hp-LEDs), which is hindered by the phosphor converter. In this work, based on the strategy of Ce3+ and Mn2+ multi-ion substitution, the single-structured LuAG:Ce,Mn ceramics with high CRI were prepared via regulating the ratio of tri-color (red, green, and blue) components. The effects of Mn2+-Si4+ pairs doping content on the crystal structure, morphologies, and luminescence properties were investigated in detail. The red emission centered at 590 and 750 nm were effectively compensated by regulating Mn2+ occupancy sites, resulting in a significant improvement of CRI. Pure white light with general CRI Ra up to 91.0, special CRI R9 reaching 37.9 and LE as high as 85.07 lm/W was achieved, when the hp-LEDs were constructed from related phosphor ceramic Ce02Mn7. These results suggest that the LuAG:Ce,Mn phosphor ceramics are highly promising color converters for hp-LEDs application. |
| Keywords: | CRI hp-LEDs LuAG:Ce,Mn PCs tunable spectrum |