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US 8,070,985 B2Granted
Method of making a lead-activated strontium hexaborate phosphor
AssigneeOsram Sylvania Inc.
InventorsGregory A. Marking, Eric R. Mercer, Chad E. DeForest
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Abstract
There is provided a method of making a SrB6O10:Pb phosphor that increases the manufactured quantity of the SrB6O10:Pb phosphor by approximately seven fold when using the same size reaction vessel, decreases the lead-containing waste stream, and eliminates the use of hazardous concentrated ammonium hydroxide. The UV emission brightness is equivalent to or better than the same phosphor when prepared using prior methods.
Claims7
A method of making a SrB6O10:Pb phosphor comprising the steps of:
- (a) forming a slurry of boric acid and water;
- (b) adding a mixture of strontium carbonate and lead oxide to the slurry;
- (c) heating and digesting the slurry for a period of time to obtain a precipitate;
- (d) drying the precipitate;
- and
- (e) firing the precipitate to form the phosphor.
3 more elements
A method of making a SrB6O10:Pb phosphor comprising the steps of:
- (a) forming a slurry of boric acid and water;
- (b) quickly adding a mixture of strontium carbonate and lead oxide to the slurry;
- (c) heating and digesting the slurry for a period of time to obtain a SrB6O10.5H2O precipitate;
- (d) drying the precipitate;
- and
- (e) firing the precipitate in air to form the phosphor.
3 more elements
Dependencies are inferred from the claim text.