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Aqueous Synthesis of Y2O2S:Eu/Silica Core-Shell Particles

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A layer-by-layer method is used to coat silica on the red phosphor powders of Y2O2S:Eu in aqueous solutions. A cationic polymer of polyethylenimine (PEI) is used to form the first-layer coating, and the precipitating sodium silicate solution, to form negatively charged silica film on the PEI-coated phosphor powder as the second-layer coating. Repetition of the above coating process in aqueous solutions, a uniform, multiple silica/PEI bilayer coating on phosphor powder is formed.
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Document Type: Research Article

Affiliations: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan

Publication date: May 1, 2005

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