Photoionization behavior of Eu2+-doped BaMgSiO4 long-persisting phosphor upon UV irradiation

被引：50
作者：
Li, Y. [1 ]
Wang, Y. [1 ]
Gong, Y. [1 ]
Xu, X. [1 ]
Zhang, F. [1 ]
机构：
[1] Lanzhou Univ, Sch Phys Sci & Technol, Dept Mat Sci, Lanzhou 730000, Peoples R China
来源：
ACTA MATERIALIA | 2011年 / 59卷 / 08期
基金：
美国国家科学基金会;
关键词：
Lattice defects; Optical properties; Rare earth; LUMINESCENT PROPERTIES; MECHANISM; EU2+; THERMOLUMINESCENCE; FLUORESCENCE; ULTRAVIOLET; EXCITATION; DY3+; EU3+;
D O I：
10.1016/j.actamat.2011.01.057
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The fluorescence, phosphorescence and thermoluminescence properties of Eu-doped BaMgSiO4 phosphors sintered in air and in a reducing atmosphere were investigated. Phosphorescence of phosphor sintered in a reducing atmosphere can last for 1.5 h at a recognizable intensity level, whereas phosphorescence of air-sintered phosphor can only persist for 6 min. In addition, a distinction between the shape of the fluorescence spectrum and its corresponding phosphorescence spectrum is observed in the former case. Ionization of Eu2+ to Eu3+ upon UV irradiation is observed in the phosphor prepared in a reducing atmosphere, but there is no indication that the photogenerated Eu3+ cannot change back to its divalent state at room temperature after the excitation source is switched off. In addition, phosphor sintered in a reducing atmosphere shows photochromism upon UV irradiation. No such photoionization and photochromism behavior is observed for the air-sintered phosphor. A possible Eu2+ photoionization mechanism is constructed on the basis of these experimental observations. The photoionization mechanism presented can also successfully explain the fluorescence and phosphorescence behavior of Eu in BaMgSiO4. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：3174 / 3183
页数：10
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