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- W3036972911 abstract "Abstract Spectroscopic properties of YPO 4 nanoparticles doped with Yb 3+ , Tm 3+ , and Er 3+ ions have been studied in detail. These multiemitting materials are promising not only for photonic or electronic use but especially for anticounterfeiting applications. The nanopowders are synthesized by the facile coprecipitation method with annealing in the air atmosphere at 1000 °C. The structural and morphological studies reveal pure tetragonal nanocrystallites with an average size of 20–30 nm. Most interestingly, under NIR excitation, the samples exhibit intense upconversion (UC) luminescence where the color can be tuned by changing the laser source, switching the excitation wavelengths between 800, 975, 1208, and 1532 nm, double‐wavelength excitation, and by changing laser power density. As a result, a very high color shift, being the result of intensity changes in the emission bands of Er 3+ (green and red) and Tm 3+ (blue and red) is obtained. The luminescence lifetimes, temporal evolution, and the pump power dependences are also measured to propose the mechanisms responsible for the observed UC emission." @default.
- W3036972911 created "2020-06-25" @default.
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- W3036972911 date "2020-06-22" @default.
- W3036972911 modified "2023-10-14" @default.
- W3036972911 title "Upconversion in Detail: Multicolor Emission of Yb/Er/Tm‐Doped Nanoparticles under 800, 975, 1208, and 1532 nm Excitation Wavelengths" @default.
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- W3036972911 doi "https://doi.org/10.1002/ppsc.202000068" @default.
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