物理化学学报 >> 1995, Vol. 11 >> Issue (10): 907-911.doi: 10.3866/PKU.WHXB19951010

研究论文 上一篇    下一篇

氟化镁锶中铕和铽的电荷迁移及其平衡解析

吴郢,石春山   

  1. 中国科学院长春应用化学研究所稀土化学与物理开放实验室，长春 130022
  • 收稿日期:1994-12-03 修回日期:1995-03-10 发布日期:1995-10-15
  • 通讯作者: 石春山

Elecutron Transfer and its Equilibrium between Eu and Tb in SrMgF4 System

Wu Yinh,Shi Chun-Shan   

  1. Laboratory of Rare Earth Chemistry and Physics,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022
  • Received:1994-12-03 Revised:1995-03-10 Published:1995-10-15
  • Contact: Shi Chun-Shan

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摘要：

在氩气氛中，合成了SrMgF4：xEu，yTb复合氟化物磷光体．该体系中Eu3+和Eu2+共存．随共掺入Tb浓度的增加，Eu3+的荧光发射强度降低，Eu2+的发光增强；并且Eu2+的ESR信号增强．认为Eu3+和Tb3+之间存在电荷迁移．即Eu3+＋Tb3+→Eu2+＋Tb4+.通过半定量手段研究了这一电荷迁移反应的平衡常数

关键词: 稀土价态, 电荷迁移, ESR谱

Abstract:

Emission of europium(Ⅱ) and europium(Ⅲ) have been observed in SrMgF4:xEu, yTb phosphors which are synthesized in Ar flow. The valence state of Eu is influenced by terbium. It is noted that the intensities of the ESR peaks corresponding to Eu2+are increased when terbium ion is codoped, this can be explained by electron transfer mechanism which is Eu3++Tb3+ →Eu2++Tb4+. And its equilibrium constant is calculated.

Key words: Rare earth valence, Electron transfer, ESR spectrum