Phosphor compositions and lighting apparatus thereof

Patent metadata

Field	Value
Publication number	US-10600604-B2
Application number	US-201715631362-A
Country	US
Kind code	B2
Filing date	Jun 23, 2017
Priority date	Jun 23, 2017
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A phosphor composition is presented. The phosphor composition includes a solid solution of aluminum nitride and a complex oxide including europium and strontium, where an amount of oxygen in the solid solution is at least 0.4 weight percent and less than 1 weight percent. A lighting apparatus including a phosphor material including the phosphor composition is also provided.

First claim

The invention claimed is:

1. A phosphor composition comprising a solid solution of aluminum nitride and a complex oxide comprising europium and strontium, wherein an amount of oxygen in the solid solution is at least 0.4 weight percent and less than 1 weight percent.

2. The phosphor composition according to claim 1 , wherein the amount of oxygen is in a range of from about 0.5 weight percent to about 0.9 weight percent.

3. The phosphor composition according to claim 1 , wherein the solid solution is free of silicon.

4. The phosphor composition according to claim 1 , wherein europium is present in an amount in a range of from about 0.5 weight percent to 8.0 weight percent.

5. The phosphor composition according to claim 1 , wherein strontium is present in an amount in a range of from about 0.25 weight percent to 4 weight percent.

6. The phosphor composition according to claim 1 , having a peak emission in a wavelength range from about 450 nanometers to about 550 nanometers.

7. A lighting apparatus comprising a light source and a phosphor material radiationally coupled to the light source, wherein the phosphor material comprises the phosphor composition in accordance with claim 1 .

8. The lighting apparatus according to claim 7 , wherein the light source comprises a light emitting diode (LED) chip.

9. A backlight apparatus comprising a light source and a phosphor material radiationally coupled to the light source, wherein the phosphor material comprises the phosphor composition in accordance with claim 1 .

10. A phosphor composition derived from:
combining aluminum nitride, europium oxide and strontium carbonate, wherein an amount of a combination of europium oxide and strontium carbonate is in a range of from about 5 weight percent to about 10 weight percent, based on an amount of aluminum nitride; and
firing the combination.

11. The phosphor composition according to claim 10 , wherein an amount of europium oxide is in a range of from about 3 weight percent to about 4 weight percent, based on the amount of aluminum nitride.

12. The phosphor composition according to claim 10 , wherein an amount of strontium carbonate is in a range of from about 1.5 weight percent to about 2.5 weight percent, based on the amount of aluminum nitride.

13. The phosphor composition according to claim 10 , wherein firing is carried out at a temperature in a range of from about 1300 degrees Celsius to about 2000 degrees Celsius.

14. The phosphor composition according to claim 10 , wherein firing is carried out in a hydrogen-containing environment.

15. The phosphor composition according to claim 10 , having a solid solution of aluminum nitride and a complex oxide comprising europium and strontium, wherein an amount of oxygen in the solid solution is at least 0.4 weight percent and less than 1 weight percent.

16. The phosphor composition according to claim 10 , having a peak emission in a wavelength range from about 450 nanometers to about 550 nanometers.

17. A lighting apparatus comprising a light source and a phosphor material radiationally coupled to the light source, wherein the phosphor material comprises the phosphor composition in accordance with claim 10 .

18. The lighting apparatus according to claim 17 , wherein the light source comprises a light emitting diode (LED) chip.

19. A backlight apparatus comprising a light source and a phosphor material radiationally coupled to the light source, wherein the phosphor material comprises the phosphor composition in accordance with claim 10 .

Assignees

• Current Lighting Solutions Llc

Inventors

• Camardello Samuel Joseph

Classifications

• C09K11/0883

  Arsenides; Nitrides; Phosphides · CPC title

• H01J1/63 Primary

  characterised by the luminescent material · CPC title

• C09K11/7731

  with alkaline earth metals · CPC title

• H01L33/502

  Electricity · mapped topic

• H10H20/8512

  Wavelength conversion materials · CPC title