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- W3024562792 abstract "Abstract In this study, the upconversion (UC) emissions of Er 3+ and Yb 3+ co-doped SrZrO 3 nanocrystals (NCs) were investigated in terms of the thermal annealing temperature and concentration of Er 3+ ions and compared with the emissions under a near-ultraviolet (near-UV) excitation. The NCs were synthesized by the combustion method, and the as-synthesized NCs were post-annealed at high temperatures. The X-ray diffraction patterns revealed that the grain sizes and crystallinity degrees of the samples increased with increasing annealing temperatures. The photoluminescence spectra of our samples exhibited strong green and very weak red emissions with the near-UV excitation, originating from the f-f transitions in the Er 3+ ions. Interestingly, under near-infrared (near-IR) excitation, we identified sizable visible emissions at 525, 547, and 660 nm in our NCs, which indicated that the UC process successfully occurred in our NCs. These UC emissions were maximized in the NCs with an Er 3+ concentration of 0.02 and thermal annealing at 1000 °C. We found that the intensity ratios of red to green emissions increased with increasing annealing temperatures. We discussed the differences in the emissions between near-UV and near-IR excitations." @default.
- W3024562792 created "2020-05-21" @default.
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- W3024562792 date "2020-05-15" @default.
- W3024562792 modified "2023-10-12" @default.
- W3024562792 title "Emissions of Er3+ and Yb3+ co-doped SrZrO3 nanocrystals under near-infrared and near-ultraviolet excitations" @default.
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- W3024562792 doi "https://doi.org/10.1007/s40145-020-0381-x" @default.
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