LED-based light sources for light emitting devices and lighting arrangements with photoluminescence wavelength conversion

• US 10,204,888 B2
• Filed: 12/12/2016
• Issued: 02/12/2019
• Est. Priority Date: 04/13/2011
• Status: Active Grant

• Current Assignee: Intematix Corporation
• Original Assignee: Intematix Corporation
• Inventors: Li, Yi-Qun, Su, Hwa (Harik), Yang, Chienli (Jeff)
• Primary Examiner(s): Husar, Stephen F
• Application Number:
  US15/376,385
• Publication Number:
  US 20180130775A1
• Time in Patent Office: 792 Days
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/54 having a particular shape

Abstract

An LED-based light source for generating light having a selected dominant wavelength λ_ds comprises a package housing a plurality of LEDs consisting of LEDs from first and second wavelength bins. The first wavelength bin comprises LEDs having a dominant wavelength λ_d1 that is within a first wavelength range and the second wavelength bin comprises LEDs having a dominant wavelength λ_d2 that is within a second wavelength range. The first wavelength bin can comprise LEDs having a dominant wavelength that is shorter than the selected dominant wavelength while the second wavelength bin comprises LEDs having a dominant wavelength that is longer than the selected dominant wavelength. The wavelength bins and number of LEDs are selected such that in operation the dominant wavelength of the combined light emitted by the source is the selected dominant wavelength. Lighting arrangements and light emitting devices incorporating such light sources are disclosed.

Claims

1. A lighting arrangement comprising:

a first excitation source that generates excitation light having a first dominant wavelength in a range 450 nm to 480 nm;

a second excitation source that generates excitation light having a second dominant wavelength in a range 450 nm to 480 nm, wherein the first dominant wavelength is different from the second dominant wavelength by at least 2.5 nm; and

a photoluminescence material that converts at least a portion of the excitation light to light of a different wavelength;

wherein the emission product of the arrangement comprises a combination of the excitation light generated by the first and second excitation sources and light generated by the at least one photoluminescence material.

2. The lighting arrangement of claim 1, wherein the first excitation source comprises a plurality of LEDs each of which generates excitation light having a dominant wavelength that is within a 2.5 nm wavelength range of one another.

3. The lighting arrangement of claim 1, wherein the second excitation source comprises a plurality of LEDs each of which generates excitation light having a dominant wavelength that is within a 2.5 nm wavelength range of one another.

4. The lighting arrangement of claim 1, further comprising a third excitation source that generates excitation light having a third dominant wavelength in a range 450 nm to 480 nm, wherein the third dominant wavelength is different to the first and second dominant wavelength range.

5. The lighting arrangement of claim 4, wherein the first excitation source comprises a plurality of LEDs each of which generates excitation light having a dominant wavelength that is within a 2.5 nm wavelength range of one another.

6. The lighting arrangement of claim 5, wherein the second excitation source comprises a plurality of LEDs each of which generates excitation light having a dominant wavelength that is within a 2.5 nm wavelength range of one another.

7. The lighting arrangement of claim 6, wherein the third excitation source comprises a plurality of LEDs each of which generates excitation light having a dominant wavelength that is within a 2.5 nm wavelength range of one another.

8. The lighting arrangement of claim 1, wherein the dominant wavelength of excitation light generated by a combination of the two excitation sources varies over a range of 0.4 nm.

9. The lighting arrangement of claim 1, wherein the dominant wavelength of excitation light generated by a combination of the two excitation sources varies over a range of 0.2 nm.

10. The lighting arrangement of claim 1, further comprising a first red source that generates red light having a dominant wavelength in a wavelength range 630 nm to 740 nm and a second red source that generates second red light having a dominant wavelength in a wavelength range 630 nm to 740 nm, wherein the dominant wavelengths of the first red light and second red light are different.

11. The lighting arrangement of claim 10, wherein the first red source comprises a plurality of LEDs that generate red light having a dominant wavelength that is within a 2.5 nm wavelength range of one another.

12. The lighting arrangement of claim 11, wherein the second red source comprises a plurality of LEDs that generate red light having a dominant wavelength are within a 2.5 nm wavelength range of one another.

13. The lighting arrangement of claim 11, further comprising a third red source that generates third red light having a dominant wavelength in a range 630 nm to 740 nm, wherein the dominant wavelength of the third red light is different to the dominant wavelength of the first and second red light.

14. The lighting arrangement of claim 13, wherein at least one of the first, second or third red sources comprises a plurality of LEDs that generate red light having a dominant wavelength that is within a 2.5 nm wavelength range of one another.

15. The lighting arrangement of claim 10, wherein the dominant wavelengths of the first red light and second red light are different by at least 2.5 nm.

16. The lighting arrangement of claim 1, wherein the photoluminescence material is provided remotely to at least one of the first or second excitation sources.

17. The lighting arrangement of claim 1, wherein the photoluminescence material is packaged with at least one of the first or second excitation sources.

18. The lighting arrangement of claim 1, wherein the photoluminescence material corresponds to a layer that commonly overlays both the first excitation source and the second excitation source.