Light-emitting device

• US 9,236,414 B2
• Filed: 11/30/2012
• Issued: 01/12/2016
• Est. Priority Date: 12/26/2011
• Status: Expired due to Fees

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Matsuura, Kenichi, Ito, Yuhki
• Primary Examiner(s): REAMES, MATTHEW L
• Application Number:
  US13/691,577
• Publication Number:
  US 20130161659A1
• Time in Patent Office: 1,138 Days
• Field of Search: 257/79, 257/98
• US Class Current: 1/1
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/15 including semiconductor components having potential barriers, specially adapted for light emission
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

A light-emitting device includes a substrate, and a plurality of light-emitting elements that are mounted on the substrate and each include an LED chip and a phosphor layer on a surface thereof. A maximum deviation in a value of a chromaticity coordinate x of light emitted from the plurality of light-emitting elements is not less than 0.0125.

Claims

1. A light-emitting device, comprising:

a package comprising a single concave portion;

a plurality of light-emitting elements that are mounted inside the single concave portion of the package, each of the light-emitting elements comprising an LED (Light Emitting Diode) chip that emits light and a phosphor layer on a surface thereof, the plurality of light-emitting elements comprising a first light-emitting element and at least a second light-emitting element;

a sealing material filled in the single concave portion; and

a reflector disposed on the package to reflect the light emitted from the plurality of light-emitting elements, in a cross-sectional view, the single concave portion extending between adjacent side surfaces of the reflector such that, in the cross-sectional view, said each of the light-emitting elements is disposed between said adjacent side surfaces of the reflector,

wherein a maximum deviation in a value of a chromaticity coordinate x of light emitted from the plurality of light-emitting elements is not less than 0.0125, such that a mean value of a chromaticity coordinate x of light emitted from the first light-emitting element is greater than a mean value of the chromaticity coordinate x of the light emitted from the plurality of light-emitting elements not less than 0.0125, and a mean value of a chromaticity coordinate x of light emitted from the at least second light-emitting element is less than the mean value of the chromaticity coordinate x of the light emitted from the plurality of light-emitting elements not less than 0.05 V.

2. The light-emitting device according to claim 1, wherein the maximum deviation in the value of the chromaticity coordinate x is not more than 0.1000.

3. The light-emitting device according to claim 1, wherein the maximum deviation in the value of the chromaticity coordinate x is not less than 0.0250.

4. The light-emitting device according to claim 1, wherein the maximum deviation in the value of the chromaticity coordinate x is not less than 0.0375.

5. The light-emitting device according to claim 3, wherein the maximum deviation in the value of the chromaticity coordinate x is not more than 0.1000.

6. The light-emitting device according to claim 4, wherein the maximum deviation in the value of the chromaticity coordinate x is not more than 0.1000.

7. The light-emitting device according to claim 1, wherein the maximum deviation in the value of the chromaticity coordinate x is defined as a difference between an average value of the chromaticity coordinate x of the light emitted from the plurality of light-emitting elements and a value of the chromaticity coordinate x of light emitted from one of the plurality of light-emitting elements.

8. The light-emitting device according to claim 1, wherein the light-emitting device comprises a combination of the light-emitting elements in the package.

9. The light-emitting device according to claim 1, wherein, in the cross-sectional view, the side surfaces of the reflector sandwich the plurality of light-emitting elements.

10. The light-emitting device according to claim 9, wherein the sealing material comprises a transparent resin filling an area between the side surfaces of the reflector on the package, the transparent resin being disposed on the side surfaces of the reflector.

11. The light-emitting device according to claim 10, wherein, in said each of the light-emitting elements, said phosphor layer includes side surfaces and upper surfaces disposed with the transparent resin.

12. The light-emitting device according to claim 1, wherein said phosphor layer is disposed on a bottom surface of the LED chip of said each of the light-emitting elements.

13. The light-emitting device according to claim 1, wherein said phosphor layer abuts a bottom surface of the LED chip of said each of the light-emitting elements.

14. The light-emitting device according to claim 1, wherein said phosphor layer comprises a transparent resin film comprising a particulate phosphor.

15. The light-emitting device according to claim 1, wherein said phosphor layer comprises a plurality of phosphors which produce different wavelengths.

16. The light-emitting device according to claim 1, wherein, in said each of the light-emitting elements, said phosphor layer covers each surface of the LED chip.

17. The light-emitting device according to claim 1, wherein said phosphor layer comprises a plurality of transparent resin films each including a different phosphor.

18. The light-emitting device according to claim 1, wherein, in said each of the light-emitting elements, said phosphor layer is disposed on side surfaces of the LED chip.

19. The light-emitting device according to claim 1, wherein, in said each of the light-emitting elements, said LED chip comprises a light-emitting diode.

20. The light-emitting device according to claim 1, wherein, in the cross-sectional view, the sealing material continuously extends above upper surfaces of the light-emitting elements and between said adjacent side surfaces of the reflector.