Light emitting device and manufacturing method thereof

• US 9,735,324 B2
• Filed: 08/29/2014
• Issued: 08/15/2017
• Est. Priority Date: 09/04/2006
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Bo Geun
• Primary Examiner(s): Li, Meiya
• Application Number:
  US14/473,856
• Publication Number:
  US 20140367728A1
• Time in Patent Office: 1,082 Days
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• 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 2933/005 relating to encapsulations
• CPC Class Codes: H01L 2933/0058 relating to optical field-shaping elements
• CPC Class Codes: H01L 33/30 containing only elements of Group III and Group V of the Periodic Table
• 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
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A light emitting device including a substrate including an entire top surface that is flat, a light emitting diode on the substrate, a lead frame disposed on the flat top surface of the substrate, the lead frame electrically connected to the light emitting diode, a dam member disposed on the substrate and being adjacent to the light emitting diode, the dam member having a circular configuration which has an opening, a first member disposed on the light emitting diode, the first member including a fluorescent substance to convert a light emission spectrum of light from the light emitting diode, a second member disposed in the opening of the dam member, a circumference of the second member being defined by the dam member and a lens disposed on the second member is provided.

Claims

1. A light emitting device, comprising:

a substrate including an entire top surface that is flat;

a light emitting diode on the substrate;

a lead frame disposed on the flat top surface of the substrate, the lead frame electrically connected to the light emitting diode;

a dam member disposed on the substrate and being adjacent to the light emitting diode, the dam member having a circular configuration which has an opening;

a first member disposed on the light emitting diode, the first member including a fluorescent substance to convert a light emission spectrum of light from the light emitting diode;

a second member disposed in the opening of the dam member, a circumference of the second member being defined by the dam member and contacting a side surface of the dam member; and

a lens disposed on the second member,

wherein a height from a lowermost portion of the bottom surface of the lens to an uppermost portion of a top surface of the lens is larger than a height from a lowermost portion of a bottom surface of the first member to an uppermost portion of a top surface of the first member or from a lowermost portion of a bottom surface of the second member to an uppermost portion of the top surface of the second member,

wherein a largest width of the opening of the dam member and a largest width of the second member are the same,

wherein the second member is disposed between an inner vertical side surface of the dam member and a side surface of light emitting diode,

wherein the inner vertical side surface of the dam member contacts a side surface of the second member and is vertically extended to the flat top surface of the substrate,

wherein the second member and the lens are formed of different materials.

wherein the first member is disposed between the light emitting diode and the second member.

2. The light emitting device according to claim 1, wherein the lens covers the first member, the second member, and the light emitting diode.

3. The light emitting device according to claim 1, wherein the second member is surrounded by the dam member and disposed on the first member, and

wherein the second member contacts the top surface of the first member.

4. The light emitting device according to claim 1, wherein a largest width of the substrate is greater than a largest width of the dam member so that the substrate extends beyond the dam member.

5. The light emitting device according to claim 1, wherein the lead frame includes a portion that is disposed on the substrate and extending beyond the dam member.

6. The light emitting device according to claim 1, wherein an outer side of the lens does not extend beyond the dam member.

7. The light emitting device according to claim 1, wherein the lens comprises a hemispherical convex shape.

8. The light emitting device according to claim 1, wherein the second member includes a flat top surface.

9. The light emitting device according to claim 1, wherein the lead frame is disposed between the substrate and the dam member such that both the substrate and the dam member are separate from each other.

10. The light emitting device according to claim 1, wherein the bottom surface of the second member and a bottom surface of the light emitting diode are disposed at a same horizontal plane.

11. The light emitting device according to claim 1, wherein a curvature of the top surface of the second member and a curvature of the top surface of the lens are different from each other.

12. The light emitting device according to claim 1, wherein a curvature of the top surface of the first member and a curvature of the top surface of the second member are different from each other.

13. The light emitting device according to claim 1, wherein at least one of the first member and the second member comprises epoxy or silicone.

14. The light emitting device according to claim 1, wherein a circumference of the bottom surface of the lens is vertically aligned with the inner vertical side surface of the dam member.

15. A light emitting device, comprising:

a substrate including an entire top surface that is flat;

a light emitting diode on the substrate;

a lead frame disposed on the substrate and electrically connected to the light emitting diode;

a dam member including an inner vertical side surface and an outer vertical side surface, the dam member having a circular configuration which has an opening;

a first member disposed on the light emitting diode, the first member including a fluorescent substance to convert a light emission spectrum of light from the light emitting diode;

a second member disposed in the opening of the dam member, a circumference of the second member being defined by the inner vertical side surface of the dam member and contacting the inner vertical side surface of the dam member;

a lens disposed on the second member,

wherein the lens includes a bottom surface, a circumference of the bottom surface of the lens being vertically aligned with the inner vertical side surface of the dam member,

wherein the second member and the lens are formed of different materials,

wherein a top surface of the first member is disposed between a top surface of the light emitting diode and an entire top surface of the second member,

wherein the second member contacts an entire top surface of the first member, and

wherein a portion of the inner vertical side surface of the dam member is vertically extended to a top surface of the substrate and contacts the second member.

16. The light emitting device according to claim 15, wherein a largest diameter of the lens is the same as a largest diameter of the second member.

17. The light emitting device according to claim 15, wherein a largest width of the opening of the dam member and a largest width of the second member are the same.

18. The light emitting device according to claim 15, wherein the second member is disposed between the inner vertical side surface of the dam member and a side surface of the light emitting diode.