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US 10,240,087 B2Granted
Enhanced color-preference LED light sources using lag, nitride, and PFS phosphors
AssigneeGE Lighting Solutions, LLC
InventorsKevin James Vick, Gary Robert Allen, Ashfaqul Islam Chowdhury
Life of this patent
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Abstract
According to some embodiments, a composite light source includes at least one blue light source having a peak wavelength in the range of about 400 nanometer (nm) to about 460 nm; at least one LAG phosphor; at least one narrow red down-converter; and wherein the composite light source has a Lighting Preference Index (LPI) of at least 120. Numerous other aspects are provided.
Claims29
A composite light source comprising:
- at least one blue light source having a peak wavelength in the range of about 400 nanometer (nm) to about 460 nm;
- at least one lutetium aluminum garnet (LAG) phosphor;
- and
- at least one narrow red down-converter having a full-width at half-maximum (FWHM)<about 60 nm;
- wherein the composite light source has a Lighting Preference Index (LPI) of at least 120 and the LPI is defined by the following equation:
- LPI=100+19×[1−100√(Duv+0.010)2]+0.62×[NSV−HDV/2.5]
- where Duv is a distance of a color point from Planckian locus in u-v space, NSV is Net Saturation Value of an illumination source, and HDV is Hue Distortion Value.
4 more elements
A composite light source comprising:
- at least one blue light source having a peak wavelength in the range of about 400 nanometer (nm) to about 460 nm;
- at least one lutetium aluminum garnet (LAG) phosphor;
- and
- at least one narrow red down-converter having a full-width at half-maximum (FWHM)<about 60 nm;
- wherein a color appearance of the composite light source is represented as
- (
- Dom
- LAG
- -
- 566
- +
- 0.004
- *
- C
-
-
- C
-
-
- T
- )
- 2
- <
- 324
-
- (
- 1
- -
- (
- Duv
- +
- 0.0096
- 0.0065
- )
- 2
- )
- ,
- where Duv is a measure of the whiteness of the composite light source and DomLAG is the dominant wavelength of the at least one LAG phosphor.
35 more elements
A composite light source comprising:
- at least one blue light source having a peak wavelength in the range of about 400 nanometer (nm) to about 460 nm;
- at least one lutetium aluminum garnet (LAG) phosphor;
- and
- at least one broad red down-converter down converter having a full-width at-half maximum (FWHM) >about 60 nm;
- wherein the composite light source has a Lighting Preference Index (LPI) of at least 120 and the LPI is defined by the following equation:
- LPI=100+19×[1−100√{square root over ((Duv+0.010)2)}]+0.62×[NSV−HDV/2.5]
- where Duv is a distance of a color point from Planckian locus in u-v space, NSV is Net Saturation Value of an illumination source, and HDV is Hue Distortion Value.
4 more elements
A composite light source comprising:
- at least one blue light source having a peak wavelength in the range of about 400 nanometer (nm) to about 460 nm;
- at least one lutetium aluminum garnet (LAG) phosphor;
- at least one broad red down converter having a full-width at-half maximum (FWHM) >about 60 nm;
- and
- wherein a color appearance of the composite light source is represented as
- (
- Dom
- LAG
- -
- 0.30
-
- (
- Peak
- Nit
- -
- 627
- )
- -
- 553.9
- +
- 0.004
- *
- C
-
-
- C
-
-
- T
- )
- 2
- <
- (
- -
- 1.114
-
- (
- Peak
- Nit
- -
- 627
- )
- +
- 9.96
-
- Peak
- Nit
- -
- 627
- -
- 0.8
- )
- 2
-
- (
- 1
- -
- (
- Duv
- +
- 0.0096
- -
- 0.00011
-
- (
- Peak
- Nit
- -
- 627
- )
- +
- 0.0020
-
- Peak
- Nit
- -
- 627
- -
- 0.0010
- )
- 2
- )
- ,
- where Duv is a measure of the whiteness of the composite light source, PeakNit is the peak wavelength of the at least one broad red nitride phosphor, and DomLAG is the dominant wavelength of the at least one LAG phosphor.
81 more elements
A composite light source comprising:
- at least one blue light source having peak wavelength in the range of about 400 nanometer (nm) to about 460 nm;
- at least one lutetium aluminum garnet (LAG) phosphor;
- at least one narrow red down-converter having a full-width at half-maximum (FWHM)<about 60 nm;
- at least one red down converter having a full-width at-half maximum (FWHM) >about 60 nm;
- and
- wherein
- the composite light source has a Lighting Preference Index (LPI) of at least 120 and the LPI is defined by the following equation:
- LPI=100+19×[1−100√{square root over ((Duv+0.010)2)}]+0.62×[NSV−HDV/2.5]
- where Duv is a distance of a color point from Planckian locus in u-v space, NSV is Net Saturation Value of an illumination source, and HDV is Hue Distortion Value.
6 more elements
Dependencies are inferred from the claim text.