Light Emitting Device, Light Emitting Device Package, and Lighting System

• US 20110266518A1
• Filed: 02/24/2011
• Published: 11/03/2011
• Est. Priority Date: 04/28/2010
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Kim, Sun Kyung
• Granted Patent: US 8,969,893 B2
• Time in Patent Office: Days
• US Class Current: 257/13
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• 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 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

Provided are a light emitting device, a light emitting device package, and a lighting system. The light emitting device includes a light emitting structure, a non-periodic light extraction pattern, and a phosphor layer. The light emitting structure includes a first conductive type semiconductor layer, a second conductive type semiconductor layer over the first conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer. The non-periodic light extraction pattern is disposed over the light emitting structure. The phosphor layer is disposed over the non-periodic light extraction pattern. The phosphor layer fills at least one portion of the non-periodic light extraction pattern.

Claims

1. A light emitting device comprising:

a light emitting structure including a first conductive type semiconductor layer, a second conductive type semiconductor layer over the first conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer;

a non-periodic light extraction pattern over the light emitting structure; and

a phosphor layer over the non-periodic light extraction pattern,

wherein the phosphor layer fills at least one portion of the non-periodic light extraction pattern.

2. The light emitting device according to claim 1, wherein the non-periodic light extraction pattern comprises a pseudorandom pattern.

3. The light emitting device according to claim 2, wherein the pseudorandom pattern comprises a hole or a column that is randomly disposed within a limited space.

4. The light emitting device according to claim 3, wherein the pseudorandom pattern has a nearest mean distance ranging from about 200 nm to about 3000 nm.

5. The light emitting device according to claim 1, wherein the non-periodic light extraction pattern comprises a circular pattern.

6. The light emitting device according to claim 5, wherein the circular pattern comprises holes or columns on circumferences of concentric circles.

7. The light emitting device according to claim 1, wherein the non-periodic light extraction pattern comprises a light extraction pattern having no translational symmetry.

8. The light emitting device according to claim 1, wherein the phosphor layer has a flat upper surface.

17. A light emitting device package comprising:

a package body;

the light emitting device of claim 1 over the package body; and

an electrode electrically connecting the package body to the light emitting device.

18. A lighting system comprising a light emitting module that includes a substrate and the light emitting device package of claim 17 over the substrate.

9. A light emitting device comprising:

a light emitting structure including a first conductive type semiconductor layer, a second conductive type semiconductor layer over the first conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer;

a non-periodic light extraction pattern over the light emitting structure; and

a phosphor layer over the non-periodic light extraction pattern,

wherein the phosphor layer has a first surface facing the light emitting structure and a second surface facing an opposite side of the first surface, and the first surface of the phosphor layer includes a pattern corresponding to the non-periodic light extraction pattern disposed on the light emitting structure.

10. The light emitting device according to claim 9, wherein the non-periodic light extraction pattern comprises a pseudorandom pattern.

11. The light emitting device according to claim 9, wherein the pseudorandom pattern comprises a hole or a column that is randomly disposed within a limited space.

12. The light emitting device according to claim 11, wherein the pseudorandom pattern has a nearest mean distance ranging from about 200 nm to about 3000 nm.

13. The light emitting device according to claim 9, wherein the non-periodic light extraction pattern comprises a circular pattern.

14. The light emitting device according to claim 13, wherein the circular pattern comprises holes or columns on circumferences of concentric circles.

15. The light emitting device according to claim 9, wherein the non-periodic light extraction pattern comprises a light extraction pattern having no translational symmetry.

16. The light emitting device according to claim 9, wherein the second surface of the phosphor layer is flat.

19. A light emitting device package comprising:

a package body;

the light emitting device of claim 9 over the package body; and

an electrode electrically connecting the package body to the light emitting device.

20. A lighting system comprising a light emitting module that includes a substrate and the light emitting device package of claim 19 over the substrate.