LIGHT EMITTING DEVICE

• US 20140300267A1
• Filed: 11/01/2012
• Published: 10/09/2014
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Oh, Jeong Taek, Lee, Yu Won
• Granted Patent: US 9,249,963 B2
• Time in Patent Office: Days
• US Class Current: 313/46
• 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: H01L 2224/48091 Arched
• 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 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• 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 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H01L 33/644 in intimate contact or integrated with parts of the device other than the semiconductor body

Abstract

Disclosed is a light emitting device. The light emitting device includes a body having a cavity, a light emitting part in the cavity, a reflective layer on an inner surface of the cavity, and a light conversion layer adjacent to the reflective layer. The light emitting device includes a body having the cavity, a light emitting part in the cavity, and a light conversion part on a path of a light from the light emitting part. The light conversion part includes a first light conversion lens part, and a second light conversion lens part beside the first light conversion lens part.

Claims

1. A light emitting device comprising:

a body having a cavity;

a light emitting part in the cavity;

a reflective layer on an inner surface of the cavity; and

a light conversion layer adjacent to the reflective layer.

2. The light emitting device of claim 1, wherein the light conversion layer covers a reflective surface of the reflective layer.

3. The light emitting device of claim 2, wherein the light conversion layer directly makes contact with the reflective layer while being spaced apart from the light emitting part.

4. The light emitting device of claim 1, further comprising a reflection part adjacent to an optical axis of the light emitting part.

5. The light emitting device of claim 1, further comprising a filling part provided in the cavity to cover the light emitting part, wherein the filling part comprises a recess part recessed toward the light emitting part.

6. The light emitting device of claim 1, wherein the light emitting part is disposed on a bottom surface of the cavity,

wherein the light conversion layer is spaced apart from the light emitting part and is provided between an inner surface of the cavity and the light emitting part,

wherein the reflective layer is disposed between the light conversion layer and the inner surface of the cavity.

7. The light emitting device of claim 6, wherein the reflective layer covers the inner surface of the cavity, and the light conversion layer covers the reflective layer.

8. The light emitting device of claim 7, further comprising a reflective part in the cavity, wherein the light conversion layer is spaced apart from the reflective part while surrounding the reflective part.

9. A light emitting device comprising:

a body having the cavity;

a light emitting part in the cavity;

a light conversion part on a path of a light from the light emitting part;

a first capping part interposed between the light emitting part and the light conversion part; and

a heat transfer part in the first capping part,

wherein the light conversion part comprises;

a first light conversion lens part; and

a second light conversion lens part beside the first light conversion lens part,

wherein the heat transfer part includes a transmissive part.

10. The light emitting device of claim 9, wherein the first and second light conversion lens parts comprise a curved surface.

11. The light emitting device of claim 9, wherein the first light conversion lens part converts the light from the light emitting part into a light having a first wavelength band, and the second light conversion lens part converts the light from the light emitting part into a light having a second wavelength band.

12. The light emitting device of claim 11, wherein the light conversion part further comprises a third light conversion lens part provided beside the second light conversion lens part to convert the light from the light emitting part into a light having a third wavelength band.

15. The light emitting device of claim 9, further comprising a second capping part covering the light conversion part, wherein the first capping part represents thermal conductivity higher than thermal conductivity of the second capping part.

16. The light emitting device of claim 12, further comprising a transmissive region between the light conversion lens parts.

13-14. -14. (canceled)

17. A light emitting device comprising:

a substrate;

a light emitting part on the substrate;

a heat radiation part covering the light emitting part; and

a light conversion part on the heat radiation part,

wherein the heat radiation part comprises;

a first heat conductive layer covering the light emitting part;

a first adiabatic layer on the first heat conductive layer;

a second heat conductive layer on the first adiabatic layer; and

a second adiabatic layer on the second heat conductive layer.

19. The light emitting device of claim 17, wherein the first adiabatic layer covers a portion of a top surface of the first heat conductive layer, and

wherein the first heat conductive layer comprises:

a first heat transfer part corresponding to the first adiabatic layer; and

a first heat discharge part extending from the first heat transfer part and exposed from the first adiabatic layer.

20. The light emitting device of claim 19, wherein the second adiabatic layer covers a portion of a top surface of the second heat conductive layer, and

wherein the second heat conductive layer comprises:

a second heat transfer part corresponding to the second adiabatic layer; and

a second heat discharge part extending from the second heat transfer part and exposed from the second adiabatic layer.

18. (canceled)