| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1259322 | Journal of Rare Earths | 2010 | 4 Pages |
Abstract
Y2O2S:Yb/Ho-silica/aminosilane core-shell nanoparticles were prepared by a solid-gas method in combination with polyvinylpyrrolidone assisted one-step ammoniating method. The core was a single Y2O2S:Yb/Ho with 80 nm in diameter and the shell was silica/aminosilane with around 5 nm in thickness. The results of sedimentation experiment indicated that the nanoparticles could be well-dispersed in ethanol and water to form stable colloids. Since the coating weakened lattice vibration energies of the Y2O2S:Yb/Ho particles, the proportion of upconversion processes in the depletion of Ho3+5I6 level were increased, resulting in increase of green light and decrease of red light.
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