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Observation of Eu3+→Eu2+ in barium hexa-aluminates with β′ or β-alumina structures prepared in air
- Source :
-
Optical Materials . Dec2004, Vol. 27 Issue 3, p591-595. 5p. - Publication Year :
- 2004
-
Abstract
- Abstract: In 1.30BaO·6Al2O3:Eu and 0.82BaO·6Al2O3:Eu with β′- or β-alumina structure respectively, prepared in air, the doped Eu3+ ions were partially reduced to Eu2+ ions. X-ray powder diffraction patterns and photoluminescent spectra were employed to characterize the compound structures and to detect the existence of Eu2+ ions, respectively. The reduction mechanism of Eu3+→Eu2+ was proposed to be due to the existence of negative defects (e.g. ) in these compounds. This is the first observation of the reduction of Eu3+→Eu2+ in non-stoichiometric compounds prepared in an oxidizing atmosphere. And the luminescent properties of Eu2+ in the compounds of xBaO·6Al2O3:Eu2+ (x=0.82, 1.00, 1.30) showed similar behavior due to their similarity in crystal structures. [Copyright &y& Elsevier]
- Subjects :
- *INTERFEROMETRY
*SPECTRUM analysis
*BARIUM
*OPTICS
Subjects
Details
- Language :
- English
- ISSN :
- 09253467
- Volume :
- 27
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Optical Materials
- Publication Type :
- Academic Journal
- Accession number :
- 15427424
- Full Text :
- https://doi.org/10.1016/j.optmat.2004.07.008