On the phosphorescence mechanism in SrAl₂O₄:Eu²⁺ and its codoped derivatives

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• 作者：Fré ; dé ; ric Clabau ; Xavier Rocquefelte ; Sté ; phane Jobic ; Philippe Deniard ; Myung-Hwan Whangbo ; Alain Garcia ; Thierry Le Mercier
• 关键词：Phosphorescence ; Mechanism ; SrAl₂O₄ ; Electron trap ; Dopant ; Trap depth
• 刊名：Solid State Sciences
• 出版年：2007
• 期刊代码：98_12932558
• 类别：ch
• 出版时间：July 2007
• 卷：9
• 期：7
• 页码：608-612
• 文件大小：232 K

摘要

The mechanism of phosphorescence in SrAl₂O₄:Eu,Dy material is discussed on the basis of a thermo-activated release of electrons trapped at oxygen vacancy sites. The depths and concentration of the electron traps are strongly affected by codoping with trivalent lanthanide cations Ln³⁺. This finding is rationalized by comparing the ionization potentials of the dopant cation Eu²⁺, the codopant cation Ln³⁺ and the substituted cation Sr²⁺. Such a use of ionization potentials provides a practical guide with which the variation of the phosphorescent decay time in the codoped derivatives of SrAl₂O₄:Eu is predicted.