Solid state lighting device providing spectral power distribution with enhanced perceived brightness

Patent metadata

Field	Value
Publication number	US-10529900-B2
Application number	US-201815972152-A
Country	US
Kind code	B2
Filing date	May 5, 2018
Priority date	May 5, 2018
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A solid state lighting device includes at least one electrically activated solid state light emitter configured to stimulate emissions of first through third lumiphoric materials having peak wavelengths in ranges of from 485 nm to 530 nm, from 575 nm to 595 nm, and from 605 nm to 640 nm, respectively (or subranges thereof defined herein), with the third peak having a full width half maximum value of less than 60 nm. The resulting device generates aggregated emissions having a suitably high color rendering index (e.g., CRI Ra) value (e.g., at least 70), and also having a spectral power distribution with a Melanopic/Photopic ratio within a specified target range as a function of correlated color temperature, thereby providing increased perceived brightness.

First claim

What is claimed is:

1. A lighting device comprising:
at least one electrically activated solid state light emitter arranged to generate emissions having a peak wavelength in a blue range; and
first through third lumiphoric materials arranged to receive at least a portion of emissions of the at least one electrically activated solid state light emitter and configured to responsively generate lumiphor emissions;
wherein:
lumiphor emissions of the first lumiphoric material have a first peak wavelength in a range of from 485 nm to 530 nm;
lumiphor emissions of the second lumiphoric material have a second peak wavelength in a range of from 575 nm to 612 nm;
lumiphor emissions of the third lumiphoric material having a third peak wavelength in a range of from 605 nm to 640 nm, wherein the third peak wavelength corresponds to a third peak having a full width half maximum value of less than 60 nm;
the lighting device is configured to produce aggregated emissions including emissions of the at least one electrically activated solid state light emitter, the first lumiphoric material, the second lumiphoric material, and the third lumiphoric material;
the lighting device is configured to produce aggregated emissions having a CRI Ra value of at least 70; and
the lighting device is configured to produce aggregated emissions having a spectral power distribution with a Melanopic/Photopic ratio (M/P ratio) value within a target range as a function of correlated color temperature (CCT) in Kelvin of the aggregated emissions, the target range including minimum values defined by a minimum value function in which M/P ratio equals [−2.05×10 −8 (CCT) 2 +2.72×10 −4 (CCT)−0.1506], and the target range including maximum values defined by a maximum value function in which M/P ratio equals [−2.57×10 −8 (CCT) 2 +3.70×10 −4 (CCT)−0.1889], and CCT being in a range of from 2000 to 7000 Kelvin.

2. The lighting device of claim 1 , being configured to produce aggregated emissions having a spectral power distribution with a Melanopic/Photopic ratio (M/P ratio) value within a first target subrange as a function of CCT in Kelvin, the first target subrange including minimum values defined by a minimum value function in which M/P ratio equals [1.1×(−2.05×10 −8 (CCT) 2 +2.72×10 −4 (CCT)−0.1506)], the first target subrange including maximum values defined by a maximum value function in which M/P ratio equals [−2.57×10 −8 (CCT) 2 +3.70×10 −4 (CCT)−0.1889], and CCT being in a range of from 2000 to 7000 Kelvin.

3. The lighting device of claim 1 , being configured to produce aggregated emissions having a spectral power distribution with a Melanopic/Photopic ratio (M/P ratio) value within a second target subrange as a function of CCT in Kelvin, the second target subrange including minimum values defined by a minimum value function in which M/P ratio equals [1.25×(−2.05×10 −8 (CCT) 2 +2.72×10 −4 (CCT)−0.1506)], the second target subrange including maximum values defined by a maximum value function in which M/P ratio equals [−2.57×10 −8 (CCT) 2 +3.70×10 −4 (CCT)−0.1889], and CCT being in a range of from 2000 to 7000 Kelvin.

4. The lighting device of claim 1 , being configured to produce aggregated emissions having a CCT in a range of from 2000 to 6000 Kelvin.

5. The lighting device of claim 1 , being configured to produce aggregated emissions defining a color point within a ±10 step MacAdam ellipse of a Planckian Locus on a CIE 1931 chromaticity diagram.

6. The lighting device of claim 1 , being configured to produce aggregated emissions defining a color point within a ±7step MacAdam ellipse of a Planckian Locus on a CIE 1931 chromaticity diagram.

7. The lighting device of claim 1 , wherein the at least one electrically activated solid state light emitter has a peak wavelength in a range of from 430 nm to 480 nm.

8. The lighting device of claim 1 , wherein lumiphor emissions of the first lumiphoric material have a first peak wavelength in a subrange of from 485 nm to 505 nm.

9. The lighting device of claim 1 , wherein lumiphor emissions of the second lumiphoric material have a second peak wavelength in a subrange of from 575 nm to 595 nm.

10. The lighting device of claim 1 , wherein lumiphor emissions of the second lumiphoric material have a second peak wavelength in a subrange of from 580 nm to 590 nm.

11. The lighting device of claim 1 , wherein the third peak wavelength corresponds to a third peak having a full width half maximum value of less than 35 nm.

12. The lighting device of claim 1 , wherein the first peak wavelength corresponds to a third peak having a full width half maximum value of less than 60 nm.

13. The lighting device of claim 1 , wherein lumiphor emissions of the third lumiphoric material have a third peak wavelength is in a subrange of from 610 nm to 625 nm.

14. The lighting device of claim 1 , being configured to produce aggregated emissions having a CRI Ra value of at least 80.

15. The lighting device of claim 1 , being configured to produce aggregated emissions having a CRI Ra value in a range of from 75 to 95.

16. The lighting device of claim 1 , wherein the first through third lumiphoric materials are dispersed in a binder.

17. The lighting device of claim 1 , wherein the first lumiphoric material is arranged in a first layer, the second lumiphoric material is arranged in a second layer, and the third lumiphoric material is arranged in a third layer.

18. A lighting device comprising:
at least one electrically activated solid state light emitter arranged to generate emissions having a peak wavelength in a blue range; and
at least one supplemental electrically activated solid state light emitter; and
a plurality of lumiphoric materials arranged to receive at least a portion of emissions of the at least one electrically activated solid state light emitter and configured to responsively generate lumiphor emissions;
wherein:
the lighting device is configured to produce aggregated emissions including emissions of the at least one electrically activated solid state light emitter, emissions of the at least one supplemental electrically activated solid state light emitter, and emissions of the plurality of lumiphoric materials;
the lighting device is configured to produce aggregated emissions including a first peak wavelength in a range of 430 nm to 480 nm, a second peak wavelength in a range of from 485 nm to 530 nm, a third peak wavelength in a range of from 575 nm to 612 nm, and a fourth peak wavelength in a range of from 605 nm to 640 nm, and the fourth peak wavelength corresponds to a peak having a full width half maximum value of less than 60 nm;
the lighting device is configured to produce aggregated emissions having a CRI Ra value of at least 70; and
the lighting device is configured to produce aggregated emissions having a spectral power distribution with a Melanopic/Photopic ratio (M/P ratio) value within a target range as a function of correlated color temperature (CCT) in Kelvin of the aggregated emissions, the target range including minimum values defined by a minimum value function in which M/P ratio equals [−2.05×10 −8 (CCT) 2 +2.72×10 −4 (CCT)−0.1506], and the target range including maximum values defined by a maximum value function in which M/P ratio equals [−2.57×10 −8 (CCT) 2 +3.70×10 4 (CCT)−0.1889], and CCT being in a range of from 2000 to 7000 Kelvin.

19. The lighting device of claim 18 , wherein the at least one supplemental electrically activated solid state light emitter is configured to generate the second peak wavelength or the fourth

Assignees

• Ideal Ind Lighting Llc

Inventors

• Zhang Fan
• Gresback Ryan
• Ibbetson James
• Keller Bernd
• Van De Ven Antony Paul

Classifications

• H10W90/00

  Package configurations · CPC title

• F21S8/086

  with lighting device attached sideways of the standard, e.g. for roads and highways · CPC title

• F21K9/232

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

• F21W2131/103

  of streets or roads · CPC title

• F21S8/06

  by suspension · CPC title