LIGHT EMITTING DEVICE PACKAGE

• US 20100237370A1
• Filed: 08/26/2008
• Published: 09/23/2010
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: An, Joong In, Im, Hyeong Seok, Kim, Choong Youl
• Granted Patent: US 8,344,400 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

Embodiments relate to a light emitting device package. The light emitting device package comprises: a body comprising a multilayer cavity; a light emitting device in the cavity; a first phosphor layer sealing the light emitting device and comprising a first phosphor; and a second phosphor layer comprising a second phosphor on the first phosphor layer, the second phosphor and the first phosphor having a difference in the specific gravity.

Claims

1. A light emitting device package comprising:

a body comprising a multilayer cavity;

a light emitting device in the cavity;

a first phosphor layer sealing the light emitting device and comprising a first phosphor; and

a second phosphor layer comprising a second phosphor on the first phosphor layer, the second phosphor and the first phosphor having a difference in the specific gravity.

2. The light emitting device package of claim 1, comprising a third phosphor layer comprising a third phosphor on the second phosphor layer in the cavity.

3. The light emitting device package of claim 1, wherein the first phosphor emits a light having a different spectrum than the second phosphor, and

a specific gravity of the first phosphor is lower than the second phosphor.

4. The light emitting device package of claim 2, wherein the first phosphor, the second phosphor and the third phosphor emit a lights having different spectra, and

the first phosphor has a specific gravity lower than the second phosphor.

5. The light emitting device package of claim 1, wherein the first phosphor emits a light having the same spectrum as the second phosphor, and

the first phosphor has a specific gravity higher than the second phosphor.

6. The light emitting device package of claim 1, wherein the first phosphor layer or the second phosphor layer comprises at least two kinds of phosphors.

7. The light emitting device package of claim 2, wherein each of the second phosphor layer and the third phosphor layer has a thickness range of 20˜

100 mm.

8. The light emitting device package of claim 1, wherein the light emitting device is a blue LED chip, the first phosphor comprises a red phosphor, and the second phosphor comprises a green phosphor.

9. The light emitting device package of claim 2, wherein the light emitting device is an UV LED chip, and the first to third phosphor comprise at least one of a red phosphor, a green phosphor and a blue phosphor.

10. The light emitting device package of claim 1, comprising a transparent resin layer between the first phosphor layer and the second phosphor layer.

11. A light emitting device package comprising:

a body comprising a cavity;

a light emitting device in the cavity;

a plurality of lead patterns electrically connected the light emitting device;

a first phosphor layer sealing the light emitting device and comprising a first phosphor in a neighborhood of the light emitting device; and

a second phosphor layer comprising a second phosphor on the first phosphor layer, the second phosphor and the first phosphor having a difference in the specific gravity.

12. The light emitting device package of claim 11, wherein the light emitting device is a blue LED chip, and the first phosphor and the second phosphor comprise a yellow phosphor.

13. The light emitting device package of claim 11, comprising a transparent resin layer between the first phosphor layer and the second phosphor layer, wherein the first phosphor has a thickness range of 100˜

150 mm, and the second phosphor layer has a thickness range of 30˜

100 mm.

14. The light emitting device package of claim 11, wherein the first phosphor has a specific gravity of more than 3 or a material constituting the first phosphor layer.

15. The light emitting device package of claim 11, wherein the second phosphor has a particle size, which is less than 1/10 of a particle size of the first phosphor.

16. The light emitting device package of claim 11, wherein at least one of the first phosphor layer and the second phosphor layer comprises a nano-scaled filler.

17. The light emitting device package of claim 11, wherein the light emitting device is a blue LED chip, the light emitted from the light emitting device at a central region of the cavity is a bluewish white light, and the light emitted from the light emitting device at a central peripheral region of the cavity is a yellowish white.

18. The light emitting device package of claim 11, wherein comprising a transparent resin layer between the first phosphor layer and the second phosphor layer, the light emitting device is a blue LED chip, the first and second phosphors comprise a yellow phosphor, the light emitted from the light emitting device at a central region of the cavity is a bluewish white light, and the light emitted from the light emitting device at a central peripheral region of the cavity is a yellowish white.

19. The light emitting device package of claim 11, wherein the first phosphor layer is formed in an amount of more than half an inner volume of the cavity.

20. The light emitting device package of claim 11, wherein at least one of surfaces of the first phosphor layer and the second phosphor layer comprises at least one of a flat shape, a convex lens shape and a concave lens shape.