物理化学学报 >> 2011, Vol. 27 >> Issue (05): 1201-1206.doi: 10.3866/PKU.WHXB20110523

光化学和辐射化学 上一篇    下一篇

Eu离子价态对Sr2MgSi2O7:Eu发光特性的影响

吴浩怡, 胡义华, 陈丽, 王小涓   

  1. 广东工业大学物理与光电工程学院, 广州 510006
  • 收稿日期:2010-11-19 修回日期:2011-03-25 发布日期:2011-04-28
  • 通讯作者: 胡义华 E-mail:huyh@gdut.edu.cn
  • 基金资助:

    国家自然科学基金(21071034, 20871033)资助项目

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).

摘要:

分别在空气、还原气体、再空气、最后再在还原气体等气氛中通过四个步骤合成了Sr1.99MgSi2O7:Eu0.01. 在空气中合成的样品呈现出Eu2+和Eu3+两种价态的发光特征峰, 而在还原气体中合成的样品, 只呈现出Eu2+一种价态的特征发光峰, 并且有长余辉和两个热致发光带. 但若样品直接在还原气氛下合成, 则只呈现一个热致发光带. 样品在空气中合成产生空穴陷阱, 此陷阱在还原合成气氛下仍被保留, 并与还原气体合成条件下产生的电子陷阱有所区别, 最终导致两个热致发光带.

关键词: 长余辉, 晶体缺陷, 价态变化

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