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Effect of annealing atmosphere on the cerium valence state and F+ luminescence center in Ca-codoped GGAG:Ce single crystals.
- Source :
-
Physica Status Solidi (B) . Jun2015, Vol. 252 Issue 6, p1394-1401. 8p. - Publication Year :
- 2015
-
Abstract
- GGAG:Ce crystals with various Ca concentrations were grown by the Czochralski technique. The introduction of Ca2+ ions into a trivalent site results in a change in the Ce valence state as well as an additional F+ luminescence center. The changes of Ce valence state could be affected by various annealing atmospheres and were investigated via measuring the Ce3+ absorbance and observing the color change of the sample. Photoluminescence spectra and photoluminescence decay were used to reveal the occurrence of F+ center related to the oxygen vacancies during the annealing. A redox mechanism and a charge compensation process are proposed to explain the change in Ce state charge and F+ center during the annealing. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CERIUM
*LUMINESCENCE
*SINGLE crystals
*ANNEALING of metals
*PHOTOLUMINESCENCE
Subjects
Details
- Language :
- English
- ISSN :
- 03701972
- Volume :
- 252
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Physica Status Solidi (B)
- Publication Type :
- Academic Journal
- Accession number :
- 103031835
- Full Text :
- https://doi.org/10.1002/pssb.201451630