期刊
JOURNAL OF LUMINESCENCE
卷 244, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2022.118736
关键词
Nanocrystals; Zinc aluminate; Optical thermometry; Ratiometric sensing; Energy transfer
类别
资金
- Shandong Province Natural Science Foundation of China [ZR2021MA091, ZR2019MF068, ZR2020QA068, ZR2020KB018]
- Science and Technology Plan of Youth Innovation Team for Universities of Shandong Province [2019KJJ019]
- Industrial Alliance Fund of Shandong Provincial Key Laboratory [SDKL2016038]
- 'Taishan Scholars' Construction Special Fund of Shandong Province
- Introduction and Cultivation Plan of Youth Innovation Talents for Universities of Shandong Province
Cr3+/Mn2+ co-doped ZnAl2O4 phosphors with normal spinel structure were successfully synthesized. Mn2+ ions caused higher spinel inversion rate and positive effect on the luminescence of ZnAl2O4:Cr3+. Energy transfer from Mn2+ to Cr3+ was confirmed. The thermometer based on the fluorescence intensity ratio of Cr3+ showed potential application in optical thermometry.
Cr3+/Mn2+ co-doped ZnAl2O4 phosphors with normal spinel structure were successfully synthesized by using the common sol-gel method. The crystal structure was characterized by XRD, confirming the single spinel phase even 30 mol% Mn2+ doping in ZnAl2O4 lattices. The Mn2+ ions caused the cations in spinel lattices deviating from the equilibrium position, which furtherly resulted in the higher spinel inversion rate. But it revealed a positive effect on the luminescence of ZnAl2O4:Cr3+. The energy transfer from Mn2+ to Cr3+ in the ZnAl2O4 phosphors was confirmed. With Mn2+ doping in ZnAl2O4 lattices, the emission peaks at 685 nm (R-3 line) and 689 nm (R-2 line) revealed an obvious increase until the concentration of Mn2+ increased up to 18 mol%. While the emission at 687 nm (R-1 line) became weaker comparing with the emissions at 685 nm and 689 nm. The position, line width and the intensity of R-line revealed an obvious temperature dependence (80-100 K). The thermometer based on the fluorescence intensity ratio of Cr3+ was proposed, and the absolute (S-a) and relative sensitivity (S-r) were calculated, respectively, which values revealed an obvious dependence on the concentration of Mn2+ ions. 0.25 %K-1 of Sr was obtained with Mn2+ ions dopant, which was twice than that without Mn2+ ions dopants at 310 K, indicating its potential application in the optical thermometry.
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