SEMICONDUCTOR LIGHT EMITTING DEVICE

• US 20150188004A1
• Filed: 12/24/2014
• Published: 07/02/2015
• Est. Priority Date: 12/27/2013
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: OZEKI, Kenji, MIYOSHI, Tomonori
• Granted Patent: US 9,379,294 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• 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 2933/0066 relating to arrangements for conducting electric current to or from the semiconductor body
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• 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 33/54 having a particular shape
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective 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 includes a substrate, a light emitting element mounted on the substrate, a light transmissive member placed on an upper surface of the light emitting element, and a sealing member which seals the light emitting element and the light transmissive member. The light transmissive member is a plate-shaped member not containing a phosphor and is larger than the light emitting element when viewed from above. The sealing member includes a first sealing member which is formed of a light reflecting member for reflecting light emitted from the light emitting element and covers side surfaces of the light emitting element, and a second sealing member which contains a phosphor for converting the light emitted from the light emitting element into light having wavelength different from wavelength of the light emitted from the light emitting element and covers at least an upper surface of the light transmissive member.

Claims

1. A light emitting device, comprising:

a substrate;

a light emitting element mounted on the substrate;

a light transmissive member disposed on an upper surface of the light emitting element wherein the light transmissive member is a plate-shaped member not containing a phosphor and is larger than the light emitting element when viewed from above; and

a sealing member which seals the light emitting element and the light transmissive member,

wherein the sealing member includes;

a first sealing member which is formed of a light reflecting member for reflecting light emitted from the light emitting element and covers side surfaces of the light emitting element; and

a second sealing member which contains a phosphor for converting the light emitted from the light emitting element into light having a wavelength different from a wavelength of the light emitted from the light emitting element and covers at least an upper surface of the light transmissive member.

2. The light emitting device according to claim 1, wherein

the second sealing member covers side surfaces of the light transmissive member.

3. The light emitting device according to claim 1, wherein

the second sealing member covers at least a part of a lower surface of an outer extended part of the light transmissive member which extends out of the light emitting element when viewed from above, and wherein

the first sealing member covers an upper surface of the substrate.

4. The light emitting device according to claim 2, wherein

the second sealing member covers at least a part of a lower surface of an outer extended part of the light transmissive member which extends out of the light emitting element when viewed from above, and

the first sealing member covers an upper surface of the substrate.

5. The light emitting device according to claim 1 wherein

the second sealing member comprises a resin material.

6. The light emitting device according to claim 2, wherein

the second sealing member comprises a resin material.

7. The light emitting device according to claim 3, wherein

the second sealing member comprises a resin material.

8. The light emitting device according to claim 5, wherein

the first sealing member covers the upper surface of the substrate, and

the phosphor is deposited, in the second sealing member, on the upper surface of the light transmissive member and on a boundary surface between the second sealing member and the first sealing member.

9. The light emitting device according to claim 6, wherein

the first sealing member covers the upper surface of the substrate, and

the phosphor is deposited, in the second sealing member, on the upper surface of the light transmissive member and on a boundary surface between the second sealing member and the first sealing member.

10. The light emitting device according to claim 7, wherein

the first sealing member covers the upper surface of the substrate, and

the phosphor is deposited, in the second sealing member, on the upper surface of the light transmissive member and on a boundary surface between the second sealing member and the first sealing member.

13. The light emitting device according to claim 1, wherein the light emitting element comprises a plurality of light emitting elements.

14. The light emitting device according to claim 13, wherein a space is disposed between edges of adjacent ones of the plurality of light emitting elements, and wherein the space is filled with light reflecting material.

15. The light emitting device according to claim 13, further comprising a frame member surrounding the plurality of light emitting elements and the light transmissive member.

11. A method for manufacturing a light emitting device, the method comprising steps of:

(1) mounting a light emitting element on a substrate;

(2) placing a plate-shaped light transmissive member on an upper surface of the light emitting element, the plate-shaped light transmissive member being larger than the light emitting element when viewed from above;

(3) covering side surfaces of the light emitting element with a first sealing member formed of a light reflecting member which reflects light emitted from the light emitting element; and

(4) covering, after steps (2) and (3), at least an upper surface of the light transmissive member with a second sealing member containing a phosphor for converting light emitted from the light emitting element into light having a wavelength different from a wavelength of the light emitted from the light emitting element.

12. The method for manufacturing a light emitting device according to claim 11, wherein

the first sealing member comprises a resin material, and wherein

step (3) includes steps of:

dropping a liquid resin material before being cured; and

curing the liquid resin material to form the first sealing member; and

step (3) is performed before step (2).

16. A light emitting device, comprising:

a substrate;

a light emitting element mounted on the substrate, said light emitting element having a first planar dimension;

a light transmissive member disposed on an upper surface of the light emitting element, said light transmissive member having a second planar dimension larger than the first planar dimension, and comprising a plate-shaped member not containing a phosphor; and

a sealing member which seals the light emitting element and the light transmissive member,

wherein the sealing member comprises a first sealing member which is formed of a light reflecting member for reflecting light emitted from the light emitting element, and which covers side surfaces of the light emitting element, and a second sealing member which contains a phosphor for converting the light emitted from the light emitting element into light having a wavelength different from a wavelength of the light emitted from the light emitting element, and which covers at least an upper surface of the light transmissive member.