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Exciton interaction...
Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics
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- Khanin, Vasilii (author)
- Delft University of Technology
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- Venevtsev, Ivan (author)
- St. Petersburg State Polytechnical University
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- Chernenko, Kirill (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Pankratov, Vladimir (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,University of Latvia
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- Klementiev, Konstantin (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- van Swieten, Thomas (author)
- Utrecht University
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- van Bunningen, Arnoldus J. (author)
- Utrecht University
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- Vrubel, Ivan (author)
- Skolkovo Institute of Science and Technology
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- Shendrik, Roman (author)
- A. P. Vinogradov Institute of Geochemistry of the Siberian Branch of the RAS
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- Ronda, Cees (author)
- Philips Research
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- Rodnyi, Piotr (author)
- St. Petersburg State Polytechnical University
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- Meijerink, Andries (author)
- Utrecht University
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Delft University of Technology St Petersburg State Polytechnical University (creator_code:org_t)
- Elsevier BV, 2021
- 2021
- English.
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In: Journal of Luminescence. - : Elsevier BV. - 0022-2313. ; 237
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Abstract
Subject headings
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- Scintillators based on Ce-doped garnets are regularly co-doped with Mg2+ or Ca2+ to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce4+ concentration leads to poor light yield performance. In order to understand the reason for variation in luminescence efficiency of Ce3+- and Ce4+-doped garnets we investigate the differences in energy conversion processes in complex LuGd2Ga3Al2O12:Ce3+/Ce4+ ceramics by means of VUV synchrotron irradiation. At first we have established via transmission spectroscopy and X-ray absorption spectroscopy that LuGd2Ga3Al2O12:Ce, Mg sample contains cerium in the 4+ state only. Then we show with VUV spectroscopy efficient interaction of excitons with Gd3+ and Ce3+, and lack of exciton absorption edge in LuGd2Ga3Al2O12:Ce4+ excitation spectrum. Instead, Ce4+ exhibits charge-transfer absorption band in the range of exciton emission. We suggest that when Ce4+ concentration becomes too high, the exciton → Gd3+ → Ce3+ energy transfer path is hindered. It leads to high intensity of Gd3+ luminescence in Lu1Gd2Ga3Al2O12:Ce, Mg ceramics, but lowered Ce3+ X-ray excited luminescence. Fine balance between 3+ and 4+ Ce concentrations is necessary to achieve the best performance of garnet scintillators.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- Ce
- Energy transfer
- Excitons
- Garnet scintillators
- Synchrotron
- XANES
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Khanin, Vasilii
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Venevtsev, Ivan
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Chernenko, Kiril ...
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Pankratov, Vladi ...
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Klementiev, Kons ...
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van Swieten, Tho ...
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show more...
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van Bunningen, A ...
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Vrubel, Ivan
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Shendrik, Roman
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Ronda, Cees
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Rodnyi, Piotr
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Meijerink, Andri ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
- Articles in the publication
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Journal of Lumin ...
- By the university
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Lund University