Red nitride phosphors
View Patent ↗Provided according to embodiments of the invention are phosphor compositions that include Ca 1-x-y Sr x Eu y AlSiN 3 , wherein x is in a range of 0.50 to 0.99 and y is less than 0.013. Also provided according to embodiments of the invention are phosphor compositions that include Ca 1-x-y Sr x Eu y AlSiN 3 , wherein x is in a range of 0.70 to 0.99 and y is in a range of 0.001 and 0.025. Also provided are methods of making phosphors and light emitting devices that include a phosphor composition according to an embodiment of the invention.
1. A light emitting device, comprising:
a solid state lighting source; and
a phosphor composition that comprises Ca 1-x-y Sr x Eu y AlSiN 3 , wherein x is in a range of 0.50 to 0.99 and y is less than 0.013, and
wherein the light emitting device has a CRI value of greater than 90.
2. The light emitting device of claim 1 , comprising emission of a warm white light having a correlated color temperature between about 2700K and 5400K.
3. The light emitting device of claim 1 , wherein the Sr to Eu ratio in the phosphor composition is in a range of 25 to 300.
4. The light emitting device of claim 1 , wherein the phosphor composition is present in particulate form and at least 95% of the particles are elongated.
5. The light emitting device of claim 1 , wherein the phosphor composition is present as particles having an average particle size in a range of 4 μm to 20 μm.
6. The light emitting device of claim 1 , wherein the phosphor composition is present as a single crystal.
7. The light emitting device of claim 1 , further comprising a green and/or yellow phosphor.
8. The light emitting device of claim 1 , wherein the phosphor composition comprises at least 1% by weight of silicon aluminum oxynitride.
9. A light emitting device, comprising:
a solid state lighting source; and
a phosphor composition that comprises Ca 1-x-y Sr x Eu y AlSiN 3 , wherein x is in a range of 0.70 to 0.99 and y is in a range of 0.001 to 0.025, and
wherein the light emitting device has a CRI value of greater than 90.
10. The light emitting device of claim 9 , comprising emission of a warm white light having a correlated color temperature between about 2700K and 5400K.
11. The light emitting device of claim 9 , wherein the Sr to Eu ratio in the phosphor composition is in a range of 25 to 300.
12. The light emitting device of claim 9 , wherein the phosphor composition is present in particulate form and at least 95% of the particles are elongated.
13. The light emitting device of claim 9 , wherein the phosphor composition is present as particles having an average particle size in a range of 4 μm to 20 μm.
14. The light emitting device of claim 9 , wherein the phosphor composition is present as a single crystal.
15. The light emitting device of claim 9 , further comprising a green and/or yellow phosphor.
16. The light emitting device of claim 9 , wherein the phosphor composition comprises at least 1% by weight of silicon aluminum oxynitride.