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US 10,093,856 B2Granted
Phosphor ceramic element
AssigneeNitto Denko Corporation
InventorsHiroaki Miyagawa, Ekambaram Sambandan, Bin Zhang
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Abstract
A garnet ceramic phosphor with Ce and Mn co-doping, wherein calcium and silicon in the phosphor crystal host can be minimized for enhancing performance, is described herein. Also a ceramic phosphor element comprising a garnet phosphor having composition of formula 1 or 2 is described herein: (A1-x,Cex)3(Al1-y,Mny)5-wSiwO12 (Formula 1) (Lu1-x,Cex)3(Al1-y,Mny)5-wSiwO12 (Formula 2).
Claims8
A method for making a ceramic phosphor element comprising:
- (a) sintering a laminate at a temperature of about 1550° C. to about 1850° C.;
- (b) heating the laminate to a temperature of about 1300° C. to about 1500° C. under oxygen conditions at a near vacuum;
- and
- (c) further heating the laminate to a temperature of about 1200° C. to about 1500° C. under a reducing atmosphere;
- wherein the laminate contains a precursor composition so that the ceramic phosphor element resulting from the method has a formula:
- (Lu1-x,Cex)3(Al1-y,MnOy)5-wSiwO12
- wherein x is greater than 0 and less than about 0.2;
- and
- y is greater than 0 and less than 0.1;
- and
- w is greater than 0 and less than 0.455.
8 more elements
Dependencies are inferred from the claim text.