Title
Energy transfer in <tex>$Eu^{3+}$</tex> doped scheelites : use as thermographic phosphorEnergy transfer in <tex>$Eu^{3+}$</tex> doped scheelites : use as thermographic phosphor
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Electron microscopy for materials research (EMAT)
Publication type
article
Publication
Subject
Physics
Chemistry
Source (journal)
Optics express. - -
Volume/pages
22(2014):9, p. A961-A972
ISSN
1094-4087
ISI
000335905300037
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/6eaad9/dc862d93.pdf
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