Method for making small particle red emitting phosphors
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United States of America Patent
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Sep 4, 2001
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N/A
app pub date -
Oct 23, 1999
filing date -
Oct 23, 1999
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Abstract
Yttrium, gadolinium borate phosphor particles are produced by thermal decomposition of a xerogel or an aerogel including Rare Earth (yttrium, gadolinium and europium) and Alkaline Earth (barium, strontium, calcium, magnesium) salts. A sol-gel method is used and an organic precursor such as trimethyl borate obtains the respective xerogel or aerogel. Thermal decomposition of the gel takes place at a temperature well below the normal temperature of solid state reaction synthesis. The brightness of the final phosphor is improved by 5 to 10 by mixing the gel powder with respective nitrates thereof prior to calcination. The phosphor has the empirical formula: (Y.sub.1-x-y-z Eu.sub.x Gd.sub.y M.sub.z)BO.sub.3 wherein: 0.01.ltoreq.x.ltoreq.0.1, 0.ltoreq.y.ltoreq.0.5, M=Ba/Sr/Ca/Mg and z.ltoreq.0.1.
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