Coated phosphors and light emitting devices including the same
First Claim
Patent Images
1. A method of coating a phosphor comprising:
- (a) contacting a nitride phosphor with a sol comprising;
at least one of silica, alumina, borate and a precursor thereof, and an acid catalyst; and
(b) heating the phosphor at a temperature in a range of 200°
C. to 600°
C., thereby forming a coated phosphor,wherein the sol comprises at least one of colloidal silica and colloidal alumina, andwherein the sol does not include a precursor of silica, a precursor of alumina, or a precursor of borate.
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Abstract
Provided according to embodiments of the invention are method of coating a phosphor that include contacting the phosphor with a sol comprising at least one of silica, alumina, borate and a precursor thereof, to form a coating on the phosphor; and heating the phosphor. Also provided are phosphors that are coated with alumina, silica and/or borate, and light emitting devices that include such phosphors.
65 Citations
15 Claims
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1. A method of coating a phosphor comprising:
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(a) contacting a nitride phosphor with a sol comprising;
at least one of silica, alumina, borate and a precursor thereof, and an acid catalyst; and(b) heating the phosphor at a temperature in a range of 200°
C. to 600°
C., thereby forming a coated phosphor,wherein the sol comprises at least one of colloidal silica and colloidal alumina, and wherein the sol does not include a precursor of silica, a precursor of alumina, or a precursor of borate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 13, 14, 15)
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10. A coated phosphor comprising:
a nitride phosphor in particulate form coated with alumina, silica and/or borate, wherein the phosphor has a du′
v′
of less than 0.0015 after 840 hours at 85°
C. and 85% relative humidity.- View Dependent Claims (11, 12)
Specification