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

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 meth...

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Bibliographic Details
Published in:Journal of luminescence 2012-07, Vol.132 (7), p.1768-1773
Main Authors: Song, Zhen, Liao, Jing, Ding, Xianlin, Zhou, Tianliang, Liu, Q.L.
Format: Article
Language:English
Subjects:
Bond Valence Method
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Crystal Structure
Eu2+/Eu3
Europium compounds
Exact sciences and technology
Guidelines
Inorganic compounds
Luminescence
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other solid inorganic materials
Phosphors
Photoluminescence
Physics
Reducing atmospheres
Stability
Strontium
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Summary: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. ► A general rule that controls the stability of Eu2+/Eu3+ is illustrated. ► Bond valence theory is applied to reveal the relation between structure and valence. ► Crystal structure constraints are adopted to explore the valence stability.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2012.02.013