Stability of divalent/trivalent oxidation state of europium in some Sr-based inorganic compounds

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• 作者：Zhen Song ; Jing Liao ; Xianlin Ding ; Tianliang Zhou ; Q.L. Liu ; ^{qlliu@ustb.edu.cn}
• 关键词：Eu2+/Eu3+ ; Luminescence ; Bond Valence Method ; Crystal Structure
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：July, 2012
• 卷：132
• 期：7
• 页码：1768-1773
• 文件大小：456 K

摘要

This work investigates the stability of Eu²⁺ and Eu³⁺ in some Sr-based inorganic compounds. Generally reducing condition is adopted in order to obtain Eu²⁺, however, the Eu doped SrAl₂O₄/SrLaAlO₄ case indicates that for some compounds Eu³⁺ is stabilized even in reducing atmosphere. Bond valence method is applied to explain this phenomenon and it reveals that crystal structure also determines the valence state of europium cations along with reducing/oxidizing condition. An analysis of other Eu doped Sr-based materials is performed which shows the relationship between Eu²⁺/Eu³⁺ stability and the Global Instability Index (GII). This research provides a guideline for synthesizing specific novel Eu²⁺/Eu³⁺ phosphors.