Preparation and luminescence properties of the red-emitting phosphor (Sr1-xCax) 2Si5N8:Eu2+ with different Sr/Ca ratios
来源期刊：JOURNAL OF RARE EARTHS2009年第1期
论文作者：LIU Yuanhong HE Huaqiang LIU Yuzhu ZHUANG Weidong TENG Xiaoming Hu Yunsheng
Key words：luminescence; alkaline earth; silicon nitride; white LEDs; rare earths;
Abstract: A series of Eu2+-doped ternary nitride phosphors, with a formula of (Sr1-xCax)2Si5N8: Eu2+, were synthesized by high-temperature solid-state method. The structure and luminescence properties were characterized, indicating the potential application as a red phosphor in the phosphor-converted white light-emitting diodes. The X-ray diffraction patterns showed that the Sr2Si5N8 and Ca2Si5N8 phases were generated at each end of (Sr1-xCax)2Si5N8: Eu2+ and coexisted in the range of 0.5≤x≤0.75. The emission spectra showed broad emission bands originating from the 4f65d1→4f7 transition of Eu2+ ions. The emission peak changed with the variations in Ca2+ concentration.
LIU Yuanhong1，HE Huaqiang1，LIU Yuzhu1，ZHUANG Weidong1，TENG Xiaoming1，Hu Yunsheng1
(1.National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and Grirem Advanced Materials Co. Ltd., Beijing 100088, China)
Abstract:A series of Eu2+-doped ternary nitride phosphors, with a formula of (Sr1-xCax)2Si5N8: Eu2+, were synthesized by high-temperature solid-state method. The structure and luminescence properties were characterized, indicating the potential application as a red phosphor in the phosphor-converted white light-emitting diodes. The X-ray diffraction patterns showed that the Sr2Si5N8 and Ca2Si5N8 phases were generated at each end of (Sr1-xCax)2Si5N8: Eu2+ and coexisted in the range of 0.5≤x≤0.75. The emission spectra showed broad emission bands originating from the 4f65d1→4f7 transition of Eu2+ ions. The emission peak changed with the variations in Ca2+ concentration.
Key words:luminescence; alkaline earth; silicon nitride; white LEDs; rare earths;
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