Title
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Energy transfer in doped scheelites : use as thermographic phosphor
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Author
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Abstract
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In this paper the luminescence of the scheelite-based CaGd2(1-x)Eu2x(WO4)4 solid solutions is investigated as a function of the Eu content and temperature. All phosphors show intense red luminescence due to the 5D0 7F2 transition in Eu3+, along with other transitions from the 5D1 and 5D0 excited states. For high Eu3+ concentrations the intensity ratio of the emission originating from the 5D1 and 5D0 levels has a non-conventional temperature dependence, which could be explained by a phonon-assisted cross-relaxation process. It is demonstrated that this intensity ratio can be used as a measure of temperature with high spatial resolution, allowing the use of these scheelites as thermographic phosphor. The main disadvantage of many thermographic phosphors, a decreasing signal for increasing temperature, is absent. |
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Language
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English
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Source (journal)
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Optics express. - -
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Publication
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2014
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ISSN
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1094-4087
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DOI
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10.1364/OE.22.00A961
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Volume/pages
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22
:9
(2014)
, p. A961-A972
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ISI
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000335905300037
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Full text (Publisher's DOI)
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Full text (open access)
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