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US 6,585,911 B2Granted
Method of making a borate phosphor having a discrete particle morphology
AssigneeOsram Sylvania Inc.
InventorRobert W. Wolfe
Life of this patent
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Abstract
A flux is described for making borate phosphors with a discrete particle morphology. The flux is comprised of a salt of barium, sodium, potassium, or a combination thereof. The discrete particle morphology permits the borate phosphors to be used directly without deagglomeration.
Claims18
A method of making a borate phosphor having a discrete particle morphology, the phosphor having the general formula:
- (Y1−x−y,Gdx,Acy)BO3
- where Ac is a trivalent rare earth element;
- x is from 0 to 1−y;
- y is from greater than 0 to about 0.2;
- the method comprising forming a mixture of yttrium oxide, gadolinium oxide, an oxide of the rare earth element, boric acid and a flux, the flux comprising a carbonate or nitrate of barium, sodium, potassium, or a combination thereof and firing the mixture at a temperature and for a time sufficient to form the phosphor.
2 more elements
A method of making a borate phosphor having a discrete particle morphology, the phosphor having the general formula:
- (Y(1−x−y)GdxAcy)BO3
- where Ac is either Eu or Tb;
- x is from 0 to 1−y;
- and y is from about 0.01 to about 0.10;
- the method comprising forming a mixture of yttrium oxide, gadolinium oxide, europium oxide or terbium oxide, boric acid and a flux, the flux comprising a salt of barium, sodium, potassium, or a combination thereof;
- and firing the mixture at a temperature and for a time sufficient to form the phosphor.
3 more elements
Dependencies are inferred from the claim text.