METHOD OF MAKING PHOTOLUMINESCENT SAMARIUM-DOPED TITANIUM DIOXIDE PARTICLES
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United States of America Patent
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Issued Date -
Oct 28, 2010
app pub date -
Dec 22, 2008
filing date -
Dec 27, 2007
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Abandoned
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Abstract
The disclosure provides a process for preparing photoluminescent samarium-doped titanium dioxide, typically in the rutile phase, comprising: precipitating, preferably at a pH of about 2 to about 3, a mixture comprising hydrated titanium oxide, a source of samarium, and a separable filtering agent to form a precipitated mixture comprising precipitated samarium-doped hydrated titanium oxide and the separable filtering agent; filtering the precipitated mixture to form a filter cake comprising the precipitated samarium-doped hydrated titanium oxide and the separable filtering agent; calcining the precipitated samarium-doped hydrated titanium oxide and separable filtering agent at a temperature of greater than about 300° C. to form a mixture comprising samarium-doped titanium dioxide and the separable filtering agent; and removing the separable filtering agent to recover samarium-doped titanium dioxide particles.
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