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A layer‐by‐layer method is used to coat silica on the red phosphor powders of Y 2 O 2 S: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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Chung et al. (2005) studied this question.
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