Light emitting device and method for manufacturing the same

• US 10,249,802 B2
• Filed: 03/31/2016
• Issued: 04/02/2019
• Est. Priority Date: 04/02/2015
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Baike, Ikuko, Suzuki, Ryo
• Primary Examiner(s): Wilczewski, Mary
• Assistant Examiner(s): Chiu, Tsz
• Application Number:
  US15/087,365
• Publication Number:
  US 20160293810A1
• Time in Patent Office: 1,097 Days
• CPC Class Codes: H01L 2224/32 of an individual layer connector
• CPC Class Codes: H01L 2224/97 the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/005 relating to encapsulations
• CPC Class Codes: H01L 33/0075 comprising nitride compounds
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/32 containing nitrogen
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/40 Materials therefor
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A light emitting device includes a light emitting element having a first face, a second face opposing the first face, a plurality of side faces extending between the first face and the second face, a plurality of corners where the second face meets two of the plurality of side faces, and a pair of electrodes on a second face side of the light emitting element; a light transmissive member covering a portion of at least one of the side faces and a portion of an edge where said at least one side face meets the second face such that at least one of the plurality of corners is exposed from the light transmissive member; and a covering member covering the at least one exposed corner of the light emitting element and the exterior of the light transmissive member such that the pair of electrodes are exposed from the covering member.

Claims

1. A light emitting device comprising:

a light emitting element having;

a first face,

a second face opposing the first face,

a plurality of lateral faces extending between the first face and the second face, the plurality of lateral faces including a first lateral face and a second lateral face adjacent to the first lateral face, and

a plurality of corners, each located where the second face meets two respective ones of the plurality of lateral faces, the plurality of corners including a first corner located where the second face meets the first lateral face and the second lateral face,

wherein the light emitting element comprises a pair of electrodes at a second face side of the light emitting element;

a light transmissive member covering a portion of the first lateral face and a portion of an edge where the first lateral face meets the second face, such that the first corner and a portion of the first lateral face adjacent to the first corner are exposed from the light transmissive member; and

a covering member covering, the first corner of the light emitting element, the portion of the first lateral face adjacent to the first corner, and an exterior of the light transmissive member, such that the pair of electrodes are exposed from the covering member;

wherein a difference between a thermal expansion coefficient of the covering member and a thermal expansion coefficient of the light emitting element is smaller than a difference between a thermal expansion coefficient of the light transmissive member and the thermal expansion coefficient of the light emitting element.

2. The light emitting device according to claim 1, wherein the exterior of the light transmissive member is tilted outwardly from the second face side towards the first face side of the light emitting element.

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

the light emitting element is a substantially rectangular parallelepiped having four of the corners, and

two diagonally positioned corners among the four corners are exposed from the light transmissive member and covered by the covering member.

4. The light emitting device according to claim 1, wherein:

the light emitting element is a substantially rectangular parallelepiped having four of the corners, and

two adjacent corners among the four corners and a portion of an edge between said two adjacent corners are exposed from the light transmissive member and covered by the covering member.

5. The light emitting device according to claim 4, wherein all of said four corners of the light emitting element are exposed from the light transmissive member and covered by the covering member.

6. The light emitting device according to claim 1, wherein:

the light emitting element includes a light transmissive substrate and a semiconductor stack, and

the light transmissive substrate is disposed on the first face side of the light emitting element, and the semiconductor stack is disposed on the second face side of the light emitting element.

7. The light emitting device according to claim 1, wherein:

the light transmissive member is made of a light transmissive resin, and the covering member is made of a light reflecting resin.

8. The light emitting device according to claim 1, wherein:

the light transmissive member has a first face that is flush with the first face of the light emitting element, and

the first face of the light emitting element and the first face of the light transmissive member are covered by a wavelength converting member.

9. The light emitting device according to claim 1, wherein the first face of the light emitting element is covered by the light transmissive member.

10. The light emitting device according to claim 1, wherein portions of both the first lateral face and the second lateral face adjacent to the first corner are exposed from the light transmissive member and covered by the covering member.

11. The light emitting device according to claim 1, wherein a portion of an edge where the first lateral face meets the second lateral face is exposed from the light transmissive member and covered by the covering member.

12. The light emitting device according to claim 1, further comprising:

a wavelength converting member,

wherein a portion of the light transmissive member is located between the first face of the light emitting element and the wavelength converting member.

13. The light emitting device according to claim 1, wherein lateral faces of the electrodes are covered by the covering member.

14. The light emitting device according to claim 1, wherein:

the pair of electrodes comprises a first electrode and a second electrode, and

a shape of an exposed surface of the first electrode is different from a shape of an exposed surface of the second electrode.

15. A light emitting device comprising:

a light emitting element having;

a first face,

a second face opposing the first face,

a plurality of lateral faces extending between the first face and the second face, the plurality of lateral faces including a first lateral face and a second lateral face adjacent to the first lateral face, and

a plurality of corners, each located where the second face meets two respective ones of the plurality of lateral faces, the plurality of corners including a first corner located where the second face meets the first lateral face and the second lateral face,

wherein the light emitting element comprises a pair of electrodes at a second face side of the light emitting element;

a light transmissive member covering a portion of the first lateral face and a portion of an edge where the first lateral face meets the second face, such that the first corner and a portion of an edge where the first lateral face meets the second lateral face are exposed from the light transmissive member; and

a covering member covering the first corner of the light emitting element, the portion of the edge where the first lateral face meets the second lateral face, and an exterior of the light transmissive member, such that the pair of electrodes are exposed from the covering member;

wherein a thermal expansion coefficient of the covering member is lower than a thermal expansion coefficient of the light transmissive member.

16. The light emitting device according to claim 15, wherein the exterior of the light transmissive member is tilted outwardly from the second face side towards the first face side of the light emitting element.

17. The light emitting device according to claim 15, wherein:

the light emitting element is a substantially rectangular parallelepiped having four of the corners, and

two diagonally positioned corners among the four corners are exposed from the light transmissive member and covered by the covering member.

18. The light emitting device according to claim 15, wherein:

the light emitting element is substantially a rectangular parallelepiped having four of the corners, and

two adjacent corners among the four corners and a portion of an edge between said two adjacent corners are exposed from the light transmissive member and covered by the covering member.

19. The light emitting device according to claim 18, wherein all of said four corners of the light emitting element are exposed from the light transmissive member and covered by the covering member.

20. The light emitting device according to claim 15, wherein portions of both the first lateral face and the second lateral face adjacent to the first corner are exposed from the light transmissive member and covered by the covering member.

21. The light emitting device according to claim 15, wherein a portion of an edge where the first lateral face meets the second lateral face is exposed from the light transmissive member and covered by the covering member.

22. The light emitting device according to claim 15, further comprising:

a wavelength converting member,

wherein a portion of the light transmissive member is located between the first face of the light emitting element and the wavelength converting member.

23. The light emitting device according to claim 15, wherein lateral faces of the electrodes are covered by the covering member.

24. The light emitting device according to claim 15, wherein:

the pair of electrodes comprises a first electrode and a second electrode, and

a shape of an exposed surface of the first electrode is different from a shape of an exposed surface of the second electrode.