Light emitting device

• US 7,482,636 B2
• Filed: 10/15/2004
• Issued: 01/27/2009
• Est. Priority Date: 10/15/2003
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Murayama, Takashi, Tamaki, Hiroto, Takeichi, Junji
• Primary Examiner(s): TRAN, MINH LOAN
• Application Number:
  US10/576,154
• Publication Number:
  US 20070131954A1
• Time in Patent Office: 1,565 Days
• Field of Search: 257/E33.058, 257/E33.075, 257/98, 257/99, 257/E33.061
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• 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 2924/01322 Eutectic Alloys, i.e. obtained by a liquid transforming into two solid phases
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• 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 33/644 in intimate contact or integrated with parts of the device other than the semiconductor body
• CPC Class Codes: H01L 33/648 the elements comprising fluids, e.g. heat-pipes

Abstract

A light emitting device comprises a light emitting element, and a light conversion member including a phosphor material that is capable of absorbing light emitted from the light emitting element at least partially and emitting light in different wavelength. The light emitting device further comprises a heat dissipation member in a side where the light conversion member as viewed from the light emitting element.

Claims

1. A light emitting device comprising:

a light emitting element;

a light conversion member including a phosphor material that is capable of absorbing light emitted from said light emitting element at least partially and emitting light in different wavelength thereby generating heat; and

a heat dissipation member that is located in a side where said light conversion member is provided as viewed from said light emitting element so as to dissipate heat generated by light conversion of the light conversion member.

2. The light emitting device according to claim 1, wherein said heat dissipation member has a flow path of a refrigerant.

3. The light emitting device according to claim 2, wherein said heat dissipation member includes at least one pair of an inlet for admission of said refrigerant and an outlet for ejection of the refrigerant that is circulated through said flow path.

4. The light emitting device according to claim 3, wherein said heat dissipation member is formed of a material that passes at least light from said light emitting element, or a material that passes light from both said light emitting element and said light conversion member.

5. The light emitting device according to claim 1, wherein said heat dissipation member is formed of two plate-shaped members that form the flow path for flowing cooling fluid between them, and a plurality of said light emitting elements are mounted to be two-dimensionally arranged on a main surface of said heat dissipation member, wherein a plurality of protruding portions are formed in the surface of said plate-shaped member inside said flow path, and at least some of said plurality of protruding portions are formed such that their centers are located between said light emitting elements and a substantially central part of said light emitting element.

6. A light emitting device comprising:

a light emitting element;

a light conversion member including a phosphor material that is capable of absorbing light emitted from the light emitting element at least partially and emitting light in different wavelength; and

a heat dissipation member to dissipate heat generated by light conversion of the light conversion member,

wherein said heat dissipation member having a flow path of a refrigerant includes a first heat dissipation member that has a first flow path in a side where said light emitting element is mounted, and a second heat dissipation member that has a second flow path in a side where light from said light emitting element is incident, the second heat dissipation member including said light conversion member.

7. The light emitting device according to claim 6, wherein said flow path includes a third flow path that connects said first flow path to said second flow path.

8. The light emitting device according to claim 7, wherein each or one of said first and second heat dissipation members includes a pair of an inlet for admission of said refrigerant and an outlet for ejection of the refrigerant that is circulated through said flow path.

9. The light emitting device according to claim 8, wherein said first heat dissipation member, an insulating member, a supporting substrate, and said second heat dissipation member are laminated.

10. The light emitting device according to claim 9, wherein said heat dissipation member has said inlet or outlet in at least one of main surface sides, and said insulating member and said supporting substrate have through holes that form parts of said third flow path.

11. The light emitting device according to claim 10, wherein a conductive member that contains at least one element selected the group consisting of Au, Ag, and Al is coated on at least one of main surfaces of said insulating member.

12. The light emitting device according to claim 11, wherein one electrode of said light emitting element is electrically connected to the conductive member that is coated on the at least one of main surfaces of said insulating member via a conductive wire, another electrode is electrically connected to said first heat dissipation member.

13. The light emitting device according to claim 12, wherein said second heat dissipation member is formed of a material that passes at least light from said light emitting element, or a material that passes light from both said light emitting element and said light conversion member.

14. The light emitting device according to claim 6, wherein each or one of said first and second heat dissipation members is formed of two plate-shaped members that form the flow path for flowing cooling fluid between them, and a plurality of said light emitting elements are mounted to be two-dimensionally arranged on a main surface of said first heat dissipation member, wherein a plurality of protruding portions are formed in the surface of said plate-shaped member inside said flow path, and at least some of said plurality of protruding portions are formed such that their centers are located between said light emitting elements and a substantially central part of said light emitting element.

15. A light emitting device comprising:

a heat dissipation member to dissipate heat generated by light conversion of a light conversion member, the heat dissipation member being formed of two plate-shaped members that form a flow path for flowing cooling fluid between them; and

a plurality of light emitting elements that are mounted to be two-dimensionally arranged on a main surface of the heat dissipation member,

wherein a plurality of protruding portions are formed on a surface of said plate-shaped member, the surface on which the plurality of protruding members are formed being inside said flow path, and at least some of said plurality of protruding portions are formed such that their centers are located between said light emitting elements and a substantially central part of said light emitting element.

16. The light emitting device according to claim 15, wherein said plurality of protruding portions are arranged apart from each other in a bent manner such that line segments that successively connect the protruding portions closest to each other repeatedly change their direction from a inlet part to a outlet part of said flow path.

17. The light emitting device according to claim 16, wherein at least some of said plurality of protruding portions are formed such that their centers are located between said light emitting elements.

18. The light emitting device according to claim 17, wherein said plurality of protruding portions are located at a substantially central part of and in the peripheries of the corners of the light emitting element.

19. The light emitting device according to claim 18, wherein a metal material containing Au coats an attachment surface of said plate-shaped members.

20. A light emitting device comprising:

a light emitting element;

a light conversion member including a phosphor material that is capable of absorbing light emitted from said light emitting element at least partially and emitting light in different wavelength; and

a heat dissipation member that is located in a side where said light conversion member is provided as viewed from said light emitting element so as to dissipate heat generated by light conversion of the light conversion member,

wherein said heat dissipation member defines a flow path of a refrigerant, the flow path being separated from said light emitting element.