LED lamps with improved quality of light

Patent metadata

Field	Value
Publication number	US-8933644-B2
Application number	US-201414310957-A
Country	US
Kind code	B2
Filing date	Jun 20, 2014
Priority date	Sep 18, 2009
Publication date	Jan 13, 2015
Grant date	Jan 13, 2015

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. An illumination system comprising:
at least one LED device configured in a housing structure, wherein the at least one LED device comprises an n-type region, a light-emitting active region, and a p-type region;
a wavelength conversion material optically coupled to the at least one LED device; and
a power source electrically coupled to the at least one LED device; 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 ; and
light emitted by an interaction of electromagnetic radiation emitted from the at least one LED device and from the wavelength conversion material is characterized by a spectral power distribution (SPD) in which from 1% to 4% of the power in the SPD is emitted within a short-wavelength range from about 390 nm to about 430 nm.

2. The illumination system of claim 1 , wherein the LED device comprises a gallium and nitride-containing substrate.

3. The illumination system of claim 1 , wherein the at least one LED is configured to emit electromagnetic radiation within the short-wavelength range from about 390 nm to about 430 nm.

4. The illumination system of claim 1 , wherein,
the wavelength conversion material comprises a blue phosphor and a green phosphor; and
the green phosphor is configured to absorb electromagnetic radiation emitted by the blue phosphor.

5. The illumination system of claim 1 , comprising a second LED device, wherein the second LED device is configured to emit electromagnetic radiation within a blue wavelength range, within a green wavelength range, or within a red wavelength range.

6. The illumination system of claim 1 , comprising one or more luminaires and at least one lamp selected from a MR16 lamp, a PAR30 lamp, a AR111 lamp, an A-lamp, and a combination of any of the foregoing.

7. The illumination system of claim 1 , wherein,
the SPD is configured to render a color or a white object comprising an optical brightening agent (OBA) to be substantially equal to a color of the white object under illumination by a reference illuminant; and
the SPD and the reference illuminant are characterized by the same correlated color temperature (CCT).

8. The illumination system of claim 1 , wherein,
the SPD is configured to render a color of a white object comprising an OBA to provide a first color difference and a second color difference;
the first color difference is the difference between a chromaticity of the object under illumination by the SPD and a chromaticity of the SPD;
the second color difference is the difference between a chromaticity of the object under illumination by a reference illuminant characterized by a CCT as the SPD, and a chromaticity of the reference illuminant;
the SPD and the reference illuminant are characterized by substantially the same CCT; and
the first color difference and the second color difference are within a predetermined range and are substantially equal in direction and magnitude in color space.

9. The illumination system of claim 8 , wherein,
the white object is a high whiteness reference object;
each of the first color difference and the second color differences is a Du′v′ color difference; and
the predetermined range is ±3 Du′v′ points.

10. The illumination system of claim 1 , wherein the SPD is characterized by a correlated color temperature in the range from 2000K to 10000K and by a color rendering index of at least 90.

11. The illumination system of claim 1 , wherein the SPD is configured to have a color quality scale gamut metric Qg of at least 1.05.

12. The illumination system of claim 1 , wherein from 2% to 4% of the power in the SPD is emitted within a short-wavelength range from about 390 nm to about 430 nm.

13. The illumination system of claim 1 , wherein the wavelength conversion material is configured to provide a CRI of at least 90.

14. The illumination system of claim 1 , wherein the illumination system is characterized by a SPD violet fraction less than 25% and a short wavelength SPD discrepancy less than 0.5.

15. An illumination system comprising:
at least one LED device configured in a housing structure, wherein the at least one LED device comprises an n-type region, a light-emitting active region, and a p-type region;
a wavelength conversion material optically coupled to the at least one LED device; and
a power source electrically coupled to the at least one LED device; wherein,
light emitted by the at least one LED is characterized by a spectral power distribution (SPD) configured to render a white object comprising an OBA to provide a first color difference and a second color difference;
the first color difference is the difference between a chromaticity of the object under illumination by the SPD and the chromaticity of the SPD;
the second color is the difference between a chromaticity under illumination by a reference illuminant and a chromaticity of the reference illuminant;
the SPD and the reference illuminant are characterized by substantially the same CCT; and
the first color difference and the second color difference are within a predetermined range and are substantially equal in direction and magnitude in color space.

16. The illumination system of claim 15 , wherein,
the white object is a high whiteness reference object;
each of the first color difference and the second color difference is a Du′v′ color difference; and
the predetermined range is ±3 Du′v′ points.

17. The illumination system of claim 15 , wherein,
the white object is a high whiteness reference object;
each of the first color difference and the second color difference is a CCT-Corrected Whiteness difference; and
the predetermined range is ±15 whiteness points.

18. The illumination system of claim 15 ,
wherein the at least one LED is configured to emit electromagnetic radiation within the short-wavelength range from about 390 nm to about 430 nm; and
the illumination system comprises a second LED device, wherein the second LED device is configured to emit electromagnetic radiation within a blue wavelength range, within a green wavelength range, or within a red wavelength range.

19. The illumination system of claim 15 , wherein from 1% to 4% of the power in the SPD is emitted within a short-wavelength range from about 390 nm to about 430 nm.

20. The illumination system of claim 15 , wherein the wavelength conversion material is configured to provide a CRI of at least 90.

21. The illumination system of claim 15 , wherein the illumination system is characterized by a SPD violet fraction less than 25% and a short wavelength SPD discrepancy less than 0.5.

22. An illumination system comprising:
at least one LED device configured in a housing structure, wherein the at least one LED device comprises an n-type region, a light-emitting active region, and a p-type region;
a wavelength conversion material optically coupled to the at least one LED device; and
a power source electrically coupled to the at least one LED device; 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 ;
a light emitted by an interaction of electromagnetic radiation emitted from the at least one LED device and from the wavelength conversion material is characterized by a spectral power distribution (SPD) having a short-wav

Assignees

• Soraa Inc

Inventors

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

Classifications

• F21V9/38

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

• F21V13/14

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

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title