The site occupation and valence of Mn ions in the crystal lattice of Sr4Al14O25 and its deep red emission for high color-rendering white light-emitting diodes

被引：22

作者：

Chen, Lei ^{[1
]}

Xue, Shaochan ^{[1
]}

Chen, Xiuling ^{[1
]}

Bahader, Ali ^{[2
]}

Deng, Xiaorong ^{[1
]}

Zhao, Erlong ^{[1
]}

Jiang, Yang ^{[1
]}

Chen, Shifu ^{[3
]}

Chan, Ting-Shan ^{[4
]}

Zhao, Zhi ^{[5
]}

Zhang, Wenhua ^{[5
]}

机构：

[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China

[2] Hamra Univ, Dept Chem, Mansehra 21300, Pakistan

[3] Huaibei Normal Univ, Dept Chem, Huaibei 235000, Peoples R China

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[5] Univ Sci & Technol, Natl Synchrotron Radiat Lab, Hefei 230026, Anhui, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2014年 / 60卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Optical materials; Luminescence; X-ray absorption near-edge structure (XANES); Electron spin resonance; Phosphors; LUMINESCENT PROPERTIES; OPTICAL-PROPERTIES; ORANGE LUMINESCENCE; ENERGY-TRANSFER; PHOSPHOR; OXYFLUORIDE; EFFICIENT; CAALSIN3; ALLOY; EU2+;

D O I：

10.1016/j.materresbull.2014.08.055

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The synthesis and component of red phosphor, Sr4Al14O25:Mn, were optimized for application in white light-emitting diodes. The microstructure and morphology were investigated by the X-ray diffraction and scanning electron microscopy. Different valences of Mn ions in Sr4Al14O25 were discriminated using the electron paramagnetic resonance and X-ray absorption near-edge structure spectroscopy techniques. The bond-valence theory was used to analyze the effective valences of Sr2+ and Al3+ in Sr4Al14O25. As a result, the strong covalence of Al3+ in the AlO4 tetrahedron other than in the AlO6 octahedron is disclosed. The deep red emission is attributed to Mn4+ occupying the center of AlO6 octahedron. The mechanism of energy transfer is mainly through dipole-dipole interaction, revealed by the analyses of critical distance and concentration quench. A high color rendering white LED prototype with color-rendering index up to Ra 93.23 packaged by using the red phosphor demonstrates its applicability. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：604 / 611

页数：8

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