Crystal structure, photoluminescence and cathodoluminescence of Sr_{1-x}Ca_{x}Al₂O₄ doped with Eu²⁺

Liping Yu; Daniel den Engelsen; Jürgen Gorobez; George R. Fern; Terry G. Ireland; Chris Frampton; Jack Silver

doi:10.1364/ome.9.002175

journal article·2019-05-01Open access

Crystal structure, photoluminescence and cathodoluminescence of Sr_1-xCa_xAl₂O₄ doped with Eu²⁺

Liping Yu, Daniel den Engelsen, Jürgen Gorobez, George R. Fern, Terry G. Ireland, Chris Frampton, Jack Silver

Optical Materials Express· Volume 9· Issue 5

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Abstract

Copyright © 2019 The Author(s). 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.

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OpenAlex topics: Luminescence Properties of Advanced Materials · Microwave Dielectric Ceramics Synthesis · Ferroelectric and Piezoelectric Materials

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