Process for preparing rare earth luminescent materials
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United States of America Patent
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Jun 13, 2006
Grant Date -
Mar 27, 2003
app pub date -
May 24, 2002
filing date -
Sep 27, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for preparing rare earth trichromatic phosphor, comprising the following steps: (1) providing precursors for at least one composition formula selected from the group consisting of CaBPO.sub.5:xEu:yTb, CaAl.sub.rB.sub.1-rPO.sub.5:xEu:yTb and Ca.sub.2B.sub.5O.sub.9Cl:xEu:yTb, wherein x=0.02 0.05 (mole ratio), y=0.001 0.01 (mole ratio) and r=0.5 0.8; (2) grinding and mixing the precursors; and (3) calcining the product obtained in step (2) at 800 1000.degree. C. for 3 5 hours. According to the present process, only one matrix material and two rare earth reactive ions (Eu.sup.3+ and Tb.sup.3+) are required to synthesize rare earth trichromatic phosphor. That is to say, no reducing reagent is needed; and absence of reducing agent(s) reduces environmental pollution.
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