期刊
CHEMICAL ENGINEERING JOURNAL
卷 411, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128448
关键词
Manganese ion; Valence state; Garnet; Reduction treatment; Luminescent thermometer
资金
- National Natural Science Foundation of China [51702118, 51772129, U1806222]
- Science and Technology Project of Jinan [2019GXRC057]
The study investigated the valence states of manganese ions, the effects of composition variation, and post-processing on YGG(1-x)LuGG(x):Mn garnet phosphors. It was found that co-doping of Zr4+ ions and reduction processing can enhance and weaken the emissions of Mn3+ and Mn4+, respectively.
Transition metal manganese ions possess multiple valence states, and the change of local coordination environments would seriously influence their energy-level schemes and luminescence properties. Herein, YGG(1-x)LuGG(x):Mn garnet phosphors were proposed, the valence states of manganese ions and the effects of composition variation and post-processing were investigated systematically. Based on the temperature-dependent photoluminescence (PL) spectral analysis and XPS survey, the existing manganese ions are verified as Mn3+ and Mn4+. And both co-doping of Zr4+ ions and reduction processing can enhance and weaken the emissions of Mn3+ and Mn4+, respectively. Besides, introducing lutetium ions causes a PL blueshift of the two kinds of manganese ions and raises the resistance to thermally induced fluorescence quenching of Mn3+. Moreover, as for LuGG:Mn, the reduction treatment gives rise to a new garnet phase with a larger lattice parameter than that of the LuGG phase because of the existence of the LuGa antisite-defects. Finally, the combination of Mn3+ and Mn4+ ions demonstrates outstanding temperature sensing performance, further verifying the application potential of YGG(1-x)LuGG(x):Mn phosphors in optical thermometry.
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