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- W2067939186 abstract "Excitation of Ho3+ and Yb3+ co-doped lanthanum silicate and lanthanum zirconate nanoparticles with 980 nm diode laser light gave a red and green glow, respectively, observable by naked eye. Spectroscopic investigations on these materials revealed green (540 nm), red (660 nm), and near-infrared (750 nm) upconversion emissions with the green to red ratio varying with the matrix type and the dopant ion (Yb3+) concentration. The emission was predominantly red for Ho3+:Yb3+ (1:3) in lanthanum silicate nanoparticles, while it was predominantly green for Ho3+:Yb3+ (1:7) in lanthanum zirconate nanoparticles. A mechanism involving cross-relaxations and energy back transfer has been proposed to explain the observed behavior. The predominance of red emission has been attributed to a strong quenching of Ho3+ green emitting level mainly by energy back transfer from Ho3+ to Yb3+ on the basis of the near-infrared (NIR) emission spectral analysis." @default.
- W2067939186 created "2016-06-24" @default.
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- W2067939186 date "2009-07-15" @default.
- W2067939186 modified "2023-09-27" @default.
- W2067939186 title "Lanthanum Silicate and Lanthanum Zirconate Nanoparticles Co-Doped with Ho<sup>3+</sup> and Yb<sup>3+</sup>: Matrix-Dependent Red and Green Upconversion Emissions" @default.
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- W2067939186 doi "https://doi.org/10.1021/jp904516s" @default.
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