Domination of Second-Sphere Shrinkage Effect To Improve Photoluminescence of Red Nitride Phosphors

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• 作者：Wan-Yu Huang ; Fumitaka Yoshimura ; Kyota Ueda ; Wei Kong Pang ; Bing-Jian Su ; Ling-Yun Jang ; Chang-Yang Chiang ; Wuzong Zhou ; Nguyen Hoang Duy ; Ru-Shi Liu
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：December 15, 2014
• 年：2014
• 卷：53
• 期：24
• 页码：12822-12831
• 全文大小：764K
• ISSN：1520-510X

文摘

Red Ca_0.99Al_{1鈥?未/3鈥?i>x}Si_1+未+xN_3鈥?i>xC_x:Eu²⁺_0.01 (未 = 0.345; x = 0鈥?.2) nitride phosphors exhibit a blue-shifted emission with increased eye sensitivity function and excellent thermal stability. The variations in the photoluminescence in the Ca_0.99Al_{1鈥?未/3鈥?i>x}Si_1+未+xN_3鈥?i>xC_x:Eu²⁺_0.01 (未 = 0.345; x = 0鈥?.2) system are thoroughly investigated. The enhanced emission energy and the improved thermal stability with increasing x are dominated by the second-sphere shrinkage effect via the substitution of small Si⁴⁺ for large Al³⁺ with simultaneous charge compensation. Related proofs of the second-sphere shrinkage effect control for photoluminescence are confirmed via high-resolution neutron powder diffraction, EXAFS, and ²⁹Si solid-state NMR techniques.