On the phosphorescence mechanism in SrAl<sub>2sub>O<sub>4sub>:Eu<sup>2+sup> and its codoped derivatives

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• 作者：Fr&#xe9 ; d&#xe9 ; ric Clabau ; Xavier Rocquefelte ; St&#xe9 ; phane Jobic ; Philippe Deniard ; Myung-Hwan Whangbo ; Alain Garcia ; Thierry Le Mercier
• 关键词：Phosphorescence ; Mechanism ; SrAl<sub>2sub>O<sub>4sub> ; 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 SrAl<sub>2sub>O<sub>4sub>: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 Ln<sup>3+sup>. This finding is rationalized by comparing the ionization potentials of the dopant cation Eu<sup>2+sup>, the codopant cation Ln<sup>3+sup> and the substituted cation Sr<sup>2+sup>. Such a use of ionization potentials provides a practical guide with which the variation of the phosphorescent decay time in the codoped derivatives of SrAl<sub>2sub>O<sub>4sub>:Eu is predicted.