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| - At the outer surface of each phosphor particle, the cations of the phosphor material have been replaced by other cations, e.g., a metal or metalloid cation such as aluminum, barium, calcium, lanthanum, magnesium, strontium, yttrium,...http://www.google.es/patents/US5695685?utm_source=gb-gplus-sharePatente US5695685 - Phosphor with modified surface composition and method for preparation B???squeda
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