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Insight into site occupancy of cerium and manganese ions in MgAl2O4 and their energy transfer for dual-mode optical thermometry.
- Source :
-
Journal of Alloys & Compounds . Dec2022, Vol. 928, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- The cerium, manganese solely and co-doped MgAl 2 O 4 have been synthesized via traditional solid-state reaction. XRD refinement and the first-principle calculation indicate that the Mn2+ preferentially substitutes for Mg2+ while Ce3+ is more preferential for the substitution of Al site in MgAl 2 O 4 matrix. Effective energy transfer enables the photoluminescence spectra of the co-doped phosphors to show both ultraviolet (UV) emission of Ce3+ at around 359 nm and green emission of Mn2+ peaked at 516 nm. The separated emission bands of Ce3+ and Mn2+ indicate the good signal resolution. Due to relative thermally stable of Mn2+ and huge thermal quenching of Ce3+, the temperature sensing performance of the prepared phosphor was evaluated by measuring fluorescent intensity ratio (FIR) of Ce3+ to Mn2+ and lifetime of Ce3+. The maximum of the S r values is 0.59%K−1 at 448 K for FIR mode and 0.40%K−1 at 523 K for lifetime mode, respectively. Satisfactory repeatability makes it suitable for dual-mode optical thermometry. • First-principle calculation indicates Ce3+ preferentially substitutes Al3+ site. • The energy transfer mechanism from Ce3+ to Mn2+ in MgAl 2 O 4 was demonstrated. • The potential of MgAl 2 O 4 :Ce3+, Mn2+ for dual-mode thermometry was evaluated. • MgAl 2 O 4 :Ce3+, Mn2+ shows high repeatability by both FIR and lifetime technologies. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 928
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 159475878
- Full Text :
- https://doi.org/10.1016/j.jallcom.2022.166701