Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (05): 1201-1206.doi: 10.3866/PKU.WHXB20110523

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles     Next Articles

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

WU Hao-Yi, HU Yi-Hua, CHEN Li, WANG Xiao-Juan   

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. China
  • Received:2010-11-19 Revised:2011-03-25 Published:2011-04-28
  • Contact: HU Yi-Hua E-mail:huyh@gdut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21071034, 20871033).

Abstract:

Sr1.99MgSi2O7:Eu0.01 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.

Key words: Long afterglow, Lattice defect, Valence change

MSC2000: 

  • O644