Cooperative cation substitution facilitated construction of garnet oxynitride MgY2Al3Si2O11N:Ce3+ for white LEDs

被引:10
作者
Pan, Zaifa [1 ]
Wang, Ruiping [1 ]
Li, Weiqiang [1 ,2 ]
Wu, Haiqin [1 ]
Chen, Jiacheng [1 ]
Zheng, Yifan [2 ]
机构
[1] Zhejiang Univ Technol, Coll Chem Engn, Hangzhou, Zhejiang, Peoples R China
[2] Zhejiang Univ Technol, Res Ctr Anal & Measurement, Hangzhou, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
LED; phosphors; photoluminescence; LIGHT-EMITTING-DIODES; LUMINESCENT PROPERTIES; THERMAL-STABILITY; CRYSTAL-CHEMISTRY; PHOSPHORS; EMISSION; PHOTOLUMINESCENCE; CE3+;
D O I
10.1111/jace.15787
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Structural modification is an important means to induce redshift of Ce3+ emission in garnet phosphor. We intend to design and synthesize garnet oxynitride compounds which combine attributes of rigidity inherited from garnet structure and of high covalence characteristic of oxynitride compounds. However, impurity phase usually occurs in the nitridation of garnet phosphor, due to the low solubility of nitrogen in oxides. We herein exploit the cooperative cation substitution strategy to facilitate the incorporation of nitrogen in Y3Al5O12. It is found that partial substitution of Y3+-Al-tet(3+) pairs by Mg2+-Si4+ pairs can diminish the phase instability caused by the replacement of Al-tet(3+)-O2- by Si4+-N3-. A novel pure garnet phase oxynitride phosphor MgY2Al3Si2O11N:Ce3+ with a higher substitution content of N has been obtained and the successful incorporation of N in the garnet phosphor is confirmed by the Rietveld refinements of XRD, XPS, and TEM. The emission and excitation spectra indicate that the blue-light-excitable MgY2Al3Si2O11N:Ce3+ phosphor exhibited a bright yellow-orange emission peaking at 570 nm, which is redshifted by 28 nm when compared to YAG:Ce3+. The garnet oxynitride phosphor exhibit excellent thermal stability with high quantum efficiency and is a promising candidate for warm white LED.
引用
收藏
页码:5451 / 5460
页数:10
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