Claims
- 1. A phosphor of the formula
- 2. The phosphor of claim 1, wherein x is 0.001 to 0.10.
- 3. The phosphor of claim 1, wherein x is 0.01 to 0.07.
- 4. A composition of a phosphor of the formula
- 5. The composition of claim 5, wherein the median grain size is from 2 to 3.5 microns.
- 6. The composition of claim 5, wherein the median grain size is from 2 to 3 microns.
- 7. The composition of claim 5, wherein the quantum efficiency of the phosphor composition is 87% or more.
- 10. The composition of claim 6, wherein the quantum efficiency of the phosphor composition is 88% or more.
- 11. The composition of claim 6, wherein the quantum efficiency of the phosphor composition is 89% or more.
- 12. A method of forming a phosphor of the formula
- 13. The method of claim 12, wherein the collected phosphor composition has a quantum efficiency of 85% or more
- 14. The method of claim 12, wherein the first precipitating is conducted in an aqueous organic solution having lower polarity than water.
- 15. The method of claim 12, wherein the first precipitating is conducted in an aqueous solution containing a surfactant.
- 16. A light emitting device comprising:
a light output; a light source; and a wavelength transformer located between the light source and the light output, comprising SrGa2S4:Eu:xGa2S3 wherein x is 0.0001 to 0.2, and wherein a minor part of the europium component is substituted with praseodymium in an efficiency enhancing amount, the wavelength transformer effective to increase the light at the light output having wavelength from 492 nm to 577 nm.
- 16. A light emitting device comprising:
a light output; a light source; and a wavelength transformer located between the light source and the light output, comprising SrGa2S4:Eu:xGa2S3 wherein x is 0.0001 to 0.2, wherein a minor part of the europium component may be substituted with praseodymium in an efficiency enhancing amount, wherein the median grain size of the phosphor composition is from 2 to 4.5 microns, and wherein the quantum efficiency of the phosphor composition is 85% or more, the wavelength transformer effective to increase the light at the light output having wavelength from 492 nm to 577 nm.
Parent Case Info
[0001] This application claims the priority of Serial No. 60/451,751, filed Mar. 4, 2003.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60451751 |
Mar 2003 |
US |