Photoluminescence Properties and Valence Stability of Eu in CaMgSiO4

被引：21

作者：

Li, Yanqin ^{[1
]}

Wang, Yuhua ^{[1
,2
]}

Xu, Xuhui ^{[1
]}

Yu, Gong ^{[1
]}

Zhang, Feng ^{[1
]}

机构：

[1] Lanzhou Univ, Dept Mat Sci, Sch Phys Sci & Technol, Lanzhou 730000, Peoples R China

[2] Lanzhou Univ, Key Lab Magnetism & Magnet Mat, Minist Educ, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2010年 / 157卷 / 02期

关键词：

calcium compounds; density functional theory; europium; Fermi level; magnesium compounds; phosphors; photoluminescence; ultraviolet spectra; valence bands; visible spectra; LUMINESCENT PROPERTIES; ENERGY-TRANSFER; HOST-LATTICE; EARTH IONS; PHOSPHORS; SR; BA; CA; BAMGAL10O17-EU2+; EMISSION;

D O I：

10.1149/1.3271108

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The photoluminescence (PL) properties of europium-doped CaMgSiO4 phosphors were systematically studied. Eu3+-doped CaMgSiO4 exhibited an intense red emission from the D-5(0) to F-7(J) manifold transitions of Eu3+, whereas the Eu2+-doped phosphors showed an extremely weak emission peaking at 475 nm due to the 4f(6)5d(1) to 4f(7) transition of Eu2+. The PL studies indicated that a complete reduction in Eu3+ to Eu2+ is not possible in CaMgSiO4. The vacuum ultraviolet spectrum of the undoped CaMgSiO4 showed that the host absorption energy was at ca. 150 nm. Based on the bandgap energy, the location of the energy levels of Eu2+ and the Fermi level relative to the band structure of CaMgSiO4 was deduced to discuss the valence stability of Eu and the luminescence behavior of CaMgSiO4:Eu2+. In addition, the electronic structure of CaMgSiO4 was investigated by using the density functional theory with the local-density approximation.

引用

页码：J39 / J43

页数：5

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