Citation: WU Hao-Yi, HU Yi-Hua, CHEN Li, WANG Xiao-Juan. Effect of Europium Valence on the Luminescent Properties of Sr₂MgSi₂O₇:Eu[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1201-1206. doi: 10.3866/PKU.WHXB20110523 shu

Effect of Europium Valence on the Luminescent Properties of Sr₂MgSi₂O₇:Eu

1.
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. China

Received Date: 19 November 2010
Available Online: 11 April 2011
Fund Project: 国家自然科学基金(21071034, 20871033)资助项目 (21071034, 20871033)

Sr_1.99MgSi₂O₇:Eu_0.01 samples were prepared in four steps under air, a reducing atmosphere, air again, and a reducing atmosphere again. The samples prepared in air showed both Eu²⁺ and Eu³⁺ em- ission while the samples prepared in a reducing atmosphere showed Eu²⁺ emission with a long afterglow and two thermoluminescence (TL) bands. However, only one TL band was observed for the sample prepared directly in the reducing atmosphere. Hole traps were created during the synthesis in air and were preserved during the reducing synthesis. These hole traps are different from the electron traps created by a reducing atmosphere. The hole traps and the electron traps result in two TL bands.
- Long afterglow,
- Lattice defect,
- Valence change
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Effect of Europium Valence on the Luminescent Properties of Sr₂MgSi₂O₇:Eu