Photoluminescence and Raman Spectra of Double-Perovskite Sr[sub 2]Ca(Mo/W)O[sub 6] with A- and B-Site Substitutions of Eu[sup 3+]
- 1 January 2008
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 155 (6), J148-J151
- https://doi.org/10.1149/1.2898897
Abstract
A- and B-site substituted double-perovskite Sr2CaMoO6Sr2CaMoO6 by Eu3+Eu3+ have been synthesized using solid-state reactions and characterized by X-ray diffraction, Raman spectroscopy, and photoluminescence measurement. Raman spectra are used to identify the A- and B-site substitutions, because specific Raman peaks corresponding to different ions motion are sensitive to each situation. Raman data reveal that both the A- and B-site substituted solid solutions are formed. The photoluminescence intensity of the B-site substituted Sr2CaMoO6Sr2CaMoO6 is evidently higher than that of the A-site substituted phosphor. The WO6WO6 group introduced into Sr2CaMoO6:Eu3+,Li+Sr2CaMoO6:Eu3+,Li+ acts as an energy obstacle to prevent energy transfer among MoO6MoO6 groups, leading to more energy being trapped by Eu3+Eu3+ , and a higher photoluminescence intensity is obtained. The phosphor with optimized composition Sr2Ca0.80Li0.10Eu0.10Mo0.10W0.90O6Sr2Ca0.80Li0.10Eu0.10Mo0.10W0.90O6 shows a better luminescence intensity than the commercial phosphor Y2O2S:EuY2O2S:Eu under 395 nm excitations.Keywords
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