Specific absorption in Y3Al5O12:Eu ceramics and the role of stable Eu2+ in energy transfer processes
| Autor: | Maksym Buryi, Xiaopu Chen, Qiang Liu, M. Nikl, Lubomír Havlák, Alena Beitlerova, V. Laguta, Jan Bárta, Yong Yuan, Jiang Li, Yubai Pan, V. Jarý |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
Materials science Annealing (metallurgy) Analytical chemistry Sintering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Tetraethyl orthosilicate law.invention chemistry.chemical_compound chemistry law visual_art Materials Chemistry visual_art.visual_art_medium Ceramic 0210 nano-technology Spectroscopy Luminescence Electron paramagnetic resonance |
| Zdroj: | Journal of Materials Chemistry C. 8:8823-8839 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/d0tc01957g |
| Popis: | Several sets of Eu-doped Y3Al5O12 (YAG) ceramic samples were synthesized by the vacuum sintering technique. Their structural, optical and magnetic properties were investigated by means of X-ray diffraction, X-ray fluorescence, optical absorption, time-resolved luminescence spectroscopy and electron paramagnetic resonance. Multiple annealing in different atmospheres was employed to understand the nature of strong specific absorption bands peaking at about 250, 370 and 550 nm in the case of these ceramics. The influence of sintering aids used during the preparation of ceramics (such as tetraethyl orthosilicate and/or magnesium oxide) on the optical properties is thoroughly studied. The charge transfer transition in the EuY2+ + F+ pair center is suggested to explain the nature of these absorption bands which is also supported by the peculiarities of the Eu2+ 5d–4f and F+/F luminescence occurrence. Application potential of the studied ceramics in the industrial implementation is discussed as well. |
| Databáze: | OpenAIRE |
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