Crystal structure, photoluminescence and cathodoluminescence of Sr1-xCaxAl2O4 doped with Eu2

The crystal structure, photoluminescence and some cathodoluminescent spectra of Sr0.99-xCaxEu0.01Al2O4 (Eu2+) are described. Five different phases have been found: three different monoclinic phases, one hexagonal and one cubic phase. Based on the cathodoluminescence of SrAl2O4:Eu2+ at low temperatur...

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Bibliographic Details
Published in:Optical materials express 2019-05, Vol.9 (5), p.2175
Main Authors: Yu, Liping, den Engelsen, Daniel, Gorobez, Jürgen, Fern, George R, Ireland, Terry G, Frampton, Chris, Silver, Jack
Format: Article
Language:English
Subjects:
Calcium aluminate
Cathodoluminescence
Crystal structure
Emission
Europium
Photoluminescence
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Summary:The crystal structure, photoluminescence and some cathodoluminescent spectra of Sr0.99-xCaxEu0.01Al2O4 (Eu2+) are described. Five different phases have been found: three different monoclinic phases, one hexagonal and one cubic phase. Based on the cathodoluminescence of SrAl2O4:Eu2+ at low temperature and photoluminescence of Sr1-xCaxAl2O4:Eu2+ at 0 ≤ x ≤ 0.1, we consider an alternative explanation for the origin of the 440 nm peak in the low temperature spectrum of SrAl2O4:Eu2+, namely that it can be attributed to the emission from Eu2+ ions situated on the alkaline earth sites of the monoclinic P21/n structure that generate the 440 nm emission of CaAl2O4. However, this alternative hypothesis has been eliminated by XRD analyses of SrAl2O4 at low temperature.
ISSN:2159-3930
DOI:10.1364/OME.9.002175