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US 7,427,366 B2Granted
Efficient, green-emitting phosphors, and combinations with red-emitting phosphors
AssigneeSarnoff Corporation
InventorsYongchi Tian, Perry Niel Yocom, Gerard Frederickson, Liyou Yang
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Abstract
Provided among other things is a phosphor of the formula Sr1-x3Cax3Ga2S4:Eu:xGa2S3 (I) wherein x is 0 to about 0.2 (or about 0.0001 to about 0.2), wherein x3 is 0.0001 to 1, and wherein a minor part of the europium component is substituted with praseodymium in an efficiency enhancing amount.
Claims12
A mixture of two or more phosphors, one of a first emission energy and the second of a lower emission energy, comprising:
- the first phosphor of the formula (I)
- Sr1-x3Cax3Ga2S4:Eu:xGa2S3 (I)
- wherein x is 0 to about 0.2, wherein x3 is 0.0001 to 1, and wherein a minor part of the europium component is substituted with praseodymium in an efficiency enhancing amount;
- and the second phosphor of the formula (II):
- Srx2Ca1-x2S:Eu2+, Y (II)
- wherein x2 is a number from 0 to 1.0, and Y is one or more halides in atomic or ionic form.
3 more elements
Dependencies are inferred from the claim text.