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Ca-α-SiAlON:Eu Phosphors: Oxidation States, Energy Transfer, and Emission Enhancement by Incorporation-Aimed Surface Engineering
Chen, Xiangyang1,2; Gan, Lin3; Zhang, Zhijun4; Lu, Ping1; Zeng, Xionghui5; Zhang, Linlin1; Yao, Heliang1; Xu, Fangfang1; Zhao, Jingtai4
2017
发表期刊ACS Applied Materials and Interfaces
ISSN19448244
卷号9期号:36页码:30982-30991
摘要Ca-α-SiAlON:Eu is one of the most promising phosphors exhibiting potential applications in high power LEDs owing to its excellent thermal stability and relatively high luminescence efficiency comparable to YAG:Ce commercial phosphors. The oxidation states of Eu ions in Ca-α-SiAlON:Eu are still questionable, and furthermore it exhibits lower luminescence intensity than commercial yellow phosphors. Therefore, in the present work, the valences of Eu ions in Ca-α-SiAlON have been examined, from which a mixture of divalence and trivalence is observed. Further improvement in emission intensity involves finding a way to increase the incorporation of larger Eu ions into the Ca-α-SiAlON. Here, we observed preferred doping of Eu around phosphor grain surface and then propose a surface engineering strategy involving HF pickling of glassy surface layer, formation of Eu-rich precursors, and finally post-annealing, aiming to increase surface incorporation of Eu ions. The surface engineered samples exhibit great enhancement in emission intensity with a maximum increment by 80%. © 2017 American Chemical Society.
DOI10.1021/acsami.7b05603
EI入藏号20173804181100
EI主题词Europium compounds
EI分类号537.1 Heat Treatment Processes - 547.2 Rare Earth Metals - 714.2 Semiconductor Devices and Integrated Circuits - 741.1 Light/Optics - 802.2 Chemical Reactions
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文献类型期刊论文
条目标识符http://ir.sic.ac.cn/handle/331005/25775
专题中国科学院上海硅酸盐研究所
作者单位1.State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China;
2.University of Chinese Academy of Science, Beijing; 100039, China;
3.Min. of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan; 430062, China;
4.School of Materials Science and Engineering, Shanghai University, Shanghai; 200444, China;
5.Electron Microscope Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou; 215123, China
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Chen, Xiangyang,Gan, Lin,Zhang, Zhijun,et al. Ca-α-SiAlON:Eu Phosphors: Oxidation States, Energy Transfer, and Emission Enhancement by Incorporation-Aimed Surface Engineering[J]. ACS Applied Materials and Interfaces,2017,9(36):30982-30991.
APA Chen, Xiangyang.,Gan, Lin.,Zhang, Zhijun.,Lu, Ping.,Zeng, Xionghui.,...&Zhao, Jingtai.(2017).Ca-α-SiAlON:Eu Phosphors: Oxidation States, Energy Transfer, and Emission Enhancement by Incorporation-Aimed Surface Engineering.ACS Applied Materials and Interfaces,9(36),30982-30991.
MLA Chen, Xiangyang,et al."Ca-α-SiAlON:Eu Phosphors: Oxidation States, Energy Transfer, and Emission Enhancement by Incorporation-Aimed Surface Engineering".ACS Applied Materials and Interfaces 9.36(2017):30982-30991.
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