White light emitting devices having high luminous efficiency and improved color rendering that include pass-through violet emissions

• US 10,546,843 B2
• Filed: 11/02/2018
• Issued: 01/28/2020
• Est. Priority Date: 11/03/2017
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Inventors: Tiwari, Nishant, Safarikas, Al, Power, David
• Primary Examiner(s): Ho, Tu-Tu V
• Application Number:
  US16/179,126
• Publication Number:
  US 20190139943A1
• Time in Patent Office: 452 Days
• Field of Search: 257 89
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials

Abstract

A lighting apparatus a first group of at least one first solid state emitter, each first solid state emitter including a first light emitting diode (“LED”) that, when excited, emits light having a peak wavelength in a range between about 440 nm and about 475 nm, and a second group of at least one second solid state emitter, each second solid state emitter comprising a second LED that, when excited, emits light having a peak wavelength in a range between about 390 nm and about 415 nm. Between about 2% and about 15% of a spectral power of light emitted from the lighting apparatus is light having wavelengths in the range between about 390 nm and about 415 nm.

Claims

1. A lighting apparatus, comprising:

a first group of at least one first solid state emitter, each first solid state emitter comprising a first light emitting diode (“

LED”

) that, when excited, emits light having a peak wavelength in a range between about 440 nm and about 475 nm; and

a second group of at least one second solid state emitter, each second solid state emitter comprising a second LED that, when excited, emits light having a peak wavelength in a range between about 390 nm and about 415 nm,

wherein between about 2% and about 15% of a spectral power of light emitted from the lighting apparatus is light having wavelengths in the range between about 390 nm and about 415 nm.

2. The lighting apparatus of claim 1, wherein between about 2% and about 15% of the spectral power of the light emitted from the lighting apparatus is light having wavelengths in the range between about 400 nm and about 410.

3. The lighting apparatus of claim 1, wherein between about 2% and about 15% of the spectral power of the light emitted from the lighting apparatus is light having wavelengths in the range between about 402 nm and about 409.

4. The lighting apparatus of claim 1, wherein a first portion of the first group and a first portion of the second group are electrically connected in series in a first LED string,

wherein a second portion of the first group and a second portion of the second group are electrically connected in series in a second LED string, and

wherein the first LED string and the second LED string are electrically connected in parallel.

5. The lighting apparatus of claim 1, wherein exciting the second group of the at least one second solid state emitter is configured to increase a saturation of the light emitted from the lighting apparatus in a green color range while maintaining a luminous flux efficiency of the lighting apparatus between 100 lumens per watt and 140 lumens per watt.

6. A light emitting device, comprising:

a first group of at least one first solid state emitter, each first solid state emitter comprising a first light emitting diode (“

LED”

) that, when excited, emits light having a peak wavelength in a range between about 440 nm and about 475 nm; and

a second group of at least one second solid state emitter, each second solid state emitter comprising a second LED that, when excited, emits light having a peak wavelength in a range between about 390 nm and about 415 nm,

wherein the emission of the light in the 390 nm to 415 nm wavelength range is configured to increase a saturation of a remainder of the emitted light of the light emitting device in a green-yellow color range by at least 10%.

7. The light emitting device of claim 6, wherein the light having wavelengths in the range between about 390 nm and about 415 nm is configured to increase the saturation of the emitted light in the green-yellow color range while maintaining a luminous flux efficiency of the light emitting device between 100 lumens per watt and 140 lumens per watt.

8. The light emitting device of claim 6, wherein the light having wavelengths in the range between about 390 nm and about 415 nm is configured to increase a saturation of the emitted light in a green color range while maintaining a luminous flux efficiency of the light emitting device between 100 lumens per watt and 140 lumens per watt.

9. The light emitting device of claim 6, wherein the light having wavelengths in the range between about 390 nm and about 415 nm is configured to increase a saturation of the emitted light in a violet color range while maintaining a luminous flux efficiency of the light emitting device between 100 lumens per watt and 140 lumens per watt.

10. The light emitting device of claim 6, wherein between about 2% and about 15% of a spectral power of the light emitted from the light emitting device is light having wavelengths in the range between about 400 nm and about 410.

11. The light emitting device of claim 6, wherein the emission of the light in the 390 nm to 415 nm wavelength range is configured to increase the saturation of the remainder of the emitted light of the light emitting device in the 4, 5, 6, and 7 TM-30 hue angle bins by at least 10%.

12. The light emitting device of claim 11, wherein the emission of the light in the 390 nm to 415 nm wavelength range is configured to increase the saturation of the remainder of the emitted light of the light emitting device in the 8 TM-30 hue angle bin by at least 5%.

13. A light emitting device, comprising:

a first group of at least one first solid state emitter, each first solid state emitter comprising a first blue light emitting diode (“

LED”

) that, when excited, emits light having a peak wavelength in a blue color range, and a first luminophoric medium; and

a second group of at least one second solid state emitter, each second solid state emitter comprising a second LED that, when excited, emits light having a peak wavelength in a range between about 390 nm and about 415 nm, wherein the second group of at least one second solid state emitter does not include any associated luminophoric medium thereon.

14. The light emitting device of claim 13, wherein the first luminophoric medium comprises at least a first luminescent material that, when excited by light from the first blue LED, emits light having a peak wavelength in a green color range or a yellow color range, and a second luminescent material that, when excited by light from the first blue LED, emits light having a peak wavelength in an orange color range or a red color range.

15. The light emitting device of claim 13, wherein between about 2% and about 15% of a spectral power of light emitted from the light emitting device is light having wavelengths in the range between about 390 nm and about 415 nm.

16. The light emitting device of claim 13, wherein exciting the second group of the at least one second solid state emitter is configured to increase a saturation of the light emitted from the light emitting device in a green color range while maintaining a luminous flux efficiency of the light emitting device between 100 lumens per watt and 140 lumens per watt.

17. The light emitting device of claim 13, wherein exciting the second group of the at least one second solid state emitter is configured to increase a saturation of the light emitted from the light emitting device in a yellow color range.

18. The light emitting device of claim 13, wherein exciting the second group of the at least one second solid state emitter is configured to increase a saturation of the light emitted from the light emitting device in the 4, 5, 6, and 7 TM-30 hue angle bins by at least 10% while maintaining a luminous flux efficiency of the light emitting between 100 lumens per watt and 140 lumens per watt.

19. The lighting emitting device of claim 18, wherein exciting the second group of the at least one second solid state emitter is configured to increase a saturation of the light emitted from the light emitting device in the 8 TM-30 hue angle bin by at least 5%.

20. The lighting emitting device of claim 13, wherein the light having a peak wavelength in the range between about 390 nm and about 415 nm is emitted from the light emitting device without passing through a luminophoric medium.