LED lamps with improved quality of light

Patent metadata

Field	Value
Publication number	US-9368695-B2
Application number	US-201514698574-A
Country	US
Kind code	B2
Filing date	Apr 28, 2015
Priority date	Sep 18, 2009
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

LED lamp systems having improved light quality are disclosed. The lamps emit more than 500 lm and more than 2% of the power in the spectral power distribution is emitted within a wavelength range from about 390 nm to about 430 nm.

First claim

What is claimed is:

1. A light-emitting system comprising:
at least one LED device comprising an n-type region, a light-emitting active region, and a p-type region; and emitting a first radiation characterized by a first wavelength in a first range;
at least one first wavelength conversion material optically coupled to the at least one LED device, wherein the at least one first wavelength conversion material converts a part of the first radiation to a second radiation characterized by a second wavelength in a second range from about 500 nm to about 600 nm; and
at least one second wavelength conversion material optically coupled to the at least one LED device, wherein the at least one second wavelength conversion material converts a part of the first radiation to a third radiation characterized by a third wavelength in a third range from about 600 to about 700 nm,
wherein the at least one LED device is characterized by an external quantum efficiency greater than 45% measured at a temperature of 25° C. and at a current density of 40 A/cm 2 , and
wherein a light spectrum emitted by the light-emitting system is characterized by a spectral power distribution (SPD) in which a fraction of the SPD in a fourth range from about 390 nm to about 430 nm is between 2% and 25%.

2. The system of claim 1 , wherein the SPD is characterized by a correlated color temperature in a range from about 1900K to about 6500K.

3. The system of claim 1 , wherein the SPD is characterized by a color rendering index CRI Ra higher than 75.

4. The system of claim 1 , wherein the SPD is characterized by a chromatic distance to a Planckian locus having an absolute value that is lower than 0.01 in (u′v′) units.

5. The system of claim 1 , further comprising some third wavelength conversion material optically coupled to the at least one LED device, wherein the third wavelength conversion material converts a part of the first radiation to a fourth radiation characterized by a fourth wavelength in a range from about 430 nm to about 500 nm.

6. A light-emitting system comprising:
at least one LED device comprising an n-type region, a light-emitting active region, and a p-type region, wherein the at least one LED device emits a first radiation characterized by a first wavelength in a first range from about 390 to about 430 nm; and
at least one first wavelength conversion material optically coupled to the at least one LED device, wherein the at least one first wavelength conversion material converts a part of the first radiation to a second radiation characterized by a second wavelength in a second range from about 430 nm to about 700 nm,
wherein a light spectrum emitted by the light-emitting system is characterized by a spectral power distribution (SPD), a correlated color temperature (CCT) and a color gamut index CQS Qg,
wherein a fraction of the SPD in a third range from about 390 nm to about 430 nm is between 4% and 25%; and
wherein the color gamut index CQS Qg is above 110.

7. The system of claim 6 , further comprising at least one second wavelength-conversion material.

8. The system of claim 6 , wherein the SPD is further characterized by a color rendering index CRI Ra above 75.

9. The system of claim 6 , wherein the CCT is in a range from about 1900K to about 6500K.

10. The system of claim 6 , wherein the SPD is further characterized by a distance from a Planckian locus having an absolute value that is lower than 0.01 in (u′v′) units.

11. The system of claim 6 , further comprising at least one LED device emitting at a wavelength longer than 430 nm.

12. The system of claim 6 , where the SPD is further characterized by a deep-red rendering index CRI R9 higher than 50.

13. The system of claim 6 , wherein the SPD is further characterized by an increase in saturation of a CQS red color sample VS1 by at least 3 points in comparison to a reference illuminant of the same CCT.

14. The system of claim 6 , further having a tunable spectrum such that Qg can be tuned by at least 10 points and can reach a value above 110.

15. The system of claim 6 , further comprising a filter that suppresses radiation at some wavelengths.

16. The system of claim 6 , wherein the filter comprises at least one of a dichroic filter and a neodymium-glass filter.

17. The system of claim 6 , wherein the at least one LED device and the at least one wavelength conversion material are configured such that the SPD is further characterized to increase a Color Quality Scale saturation of at least one of, VS1 (red), VS2 (red-orange), VS3 (orange), VS14 (red-pink), and VS15 (pink), by at least 5% compared to a reference illuminant having a respective CCT.

18. The system of claim 6 , wherein the at least one LED device and the at least one wavelength conversion material are configured such that the SPD substantially increases a visual saturation of warm colors selected from red, orange, and pink objects compared to a reference illuminant having a respective CCT.

19. The system of claim 6 , wherein radiation in the SPD is significantly suppressed at a wavelength in a range of about 460 nm to about 510 nm.

20. The system of claim 6 , wherein radiation in the SPD is significantly suppressed at a wavelength in a range of about 570 nm to about 600 nm.

21. The system of claim 6 , wherein radiation in the SPD is significantly suppressed at a wavelength in a range about 460 nm to about 510 nm and at a wavelength in a range 570 nm to 600 nm.

22. A light-emitting system comprising:
at least one LED device comprising an n-type region, a light-emitting active region, and a p-type region, wherein the LED device emits a first radiation characterized by a first wavelength in a first range from about 390 nm to about 430 nm; and
at least some first wavelength conversion material optically coupled to the at least one LED device, wherein the first wavelength conversion material converts a part of the first radiation to a second radiation characterized by a second wavelength in a second range from about 430 nm to about 700 nm,
wherein the at least one LED device is characterized by an external quantum efficiency greater than 45% measured at an ambient temperature of 25° C. and at a current density of 40 A/cm 2 ,
wherein, a particular light spectrum emitted by the light-emitting system is characterized by a spectral power distribution (SPD), a correlated color temperature (CCT) and a color gamut index CQS Qg, and
wherein the color gamut index CQS Qg is above 110.

23. The system of claim 22 , further comprising at least some second wavelength-conversion material.

24. The system of claim 22 , wherein the SPD is further characterized by a color rendering index CIE Ra above 75.

25. The system of claim 22 , wherein the CCT is in a range from about 1900K to about 6500K.

26. The system of claim 22 , wherein the SPD is further characterized by a distance from a Planckian locus having an absolute value that is lower than 0.01 in (u′v′) units.

27. The system of claim 22 , further comprising at least one other LED emitting at a wavelength longer than 430 nm.

28. The system of claim 22 , where the SPD is further characterized by a deep-red rendering index CIE R9 higher than 50.

29. The system of claim 22 , wherein the SPD increases saturation of a CQS red color sample VS1 by at least 3 points in comparison to a reference illuminant of a respec

Assignees

• Soraa Inc

Inventors

• David Aurelien J F
• Trottier Troy A
• Krames Michael R

Classifications

• F21V13/14

  the elements being filters or photoluminescent elements, reflectors and refractors · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• H10W90/00

  Package configurations · CPC title

• F21K9/233

  specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps · CPC title

• F21K9/232

  specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb · CPC title