2022-Sustainable Industrial Processing Summit
SIPS2022 Volume 1
Alario-Franco Intl. Symp
Solid State Chemistry
| Editors: | F. Kongoli, F. Marquis, S. Kalogirou, B. Raveau, A. Tressaud, H. Kageyama, A. Varez, R. Martins. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2022 |
| Pages: | 154 pages |
| ISBN: | 978-1-989820-34-6 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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TRIPLE TEMPERATURE READ-OUT LUMINESCENCE THERMOMETRY at CRYOGENIC TEMPERATURES USING Cr3+-ACTIVATED Mg2SiO4
Zeljka Antic1; Milica Sekulić1; Mina Medic2; Sanja Kuzman2; Zoran Ristic2; Mikhail G. Brik3; Miroslav Dramicanin2;1VINCA INSTITUTE OF NUCLEAR SCIENCES, UNIVERSITY OF BELGRADE, Belgrade, Serbia and Montenegro; 2UNIVERSITY OF BELGRADE, VINCA INSTITUTE OF NUCLEAR SCIENCES, Belgrade, Serbia and Montenegro; 3INSTITUTE OF PHYSICS, UNIVERSITY OF TARTU,, Tartu 50411, Estonia;
Type of Paper: Regular
Id Paper: 65
Topic: 52
Abstract:
Silicate-based inorganic phosphors have practical applications in many fields and their luminescent properties have been studied extensively. Among them, forsterite (Mg2SiO4) shows good chemical and physical stability, low dielectric permittivity, low thermal expansion and very good insulation properties. So, Mg2SiO4 finds practical application in different optical devices, tunable lasers, pigments, biomaterials and in electronics [1]. Furthermore, red emission of Cr3+ doped phosphors is commonly used in optical spectroscopy, in-vivo imaging, energy efficiency and luminescence [2,3]. The majority of standard thermometry methods tend to fail under room temperature. Therefore, novel temperature measurement principles are required for this temperature range. In this study, we aimed to explore the potential of Cr3+-doped Mg2SiO4 thermographic phosphor for cryogenic luminescence thermometry and thermometry in physiologically relevant window. Herein, the triple temperature read-out luminescence thermometry at cryogenic temperatures were tested using Cr3+-activated Mg2SiO4 near-infrared thermographic phosphor synthesized by combustion method. X-ray diffraction measurement confirmed orthorhombic crystal structure with the Pbnm (62) space group. Scanning electron microscopy revealed submicron size agglomerates composed of nanoparticles, and the presence of voids. In the forsterite Mg2SiO4 crystal, Cr3+ replaces Mg2+ at octahedral M1 and M2 sites with inversion (Ci) and mirror symmetry (Cs), respectively [4]. The octahedral M1 and M2 sites form the medium-field system resulting in the 2Eg → 4T2g narrow Cr3+ spin-forbidden emission at low temperatures. At higher temperatures (200–300 K), there are thermalization between 4T2g and 2Eg levels that leads to a broadband emission through 2Eg + 4T2g → 4A2g transitions [5]. The usability of this material for the luminescence thermometry was tested by three approaches: i) via temperature induced changes of emission intensity; ii) via temperature dependent luminescence lifetime and iii) via temperature induced changes of emission band position. Among investigated read-outs, the most important figures of merit, absolute and relative sensitivities, and temperature resolutions have been calculated and compared.
Keywords:
Advanced Characterization Techniques and Applications;References:
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