Light emitting device

• US 8,552,453 B2
• Filed: 06/21/2010
• Issued: 10/08/2013
• Est. Priority Date: 06/22/2009
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Takine, Kenji
• Primary Examiner(s): Such, Matthew W
• Assistant Examiner(s): Harrison, Monica D
• Application Number:
  US13/266,356
• Publication Number:
  US 20120037944A1
• Time in Patent Office: 1,205 Days
• Field of Search: 257/98, 257/E33.072, 257/E33.061
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48237 connecting the wire to a die pad of the item
• 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 24/97 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 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 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 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 2924/12035 Zener diode
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/12042 LASER
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A light emitting device, which has: a light emitting element; a package that comprises a concavity for holding the light emitting element, and that has on its side wall where the concavity is integrally formed a light reflector for reflecting light from the light emitting element and a light transmitter for transmitting light from the light emitting element to the outside.

Claims

1. A light emitting device comprising:

a light emitting element; and

a package having

a light reflector layer configured and arranged such that a surface of the light reflector layer reflects light from the light emitting element, and

a light transmitter layer integrally formed on the light reflector layer, and configured and arranged to transmit light from the light emitting element to the outside, the light reflector layer and the light transmitter layer collectively define a concavity for holding the light emitting element, with a side wall of the concavity being partially formed by the surface of the light reflector layer and partially formed by a surface of the light transmitter layer.

2. The light emitting device according to claim 1, wherein a translucent sealing resin is packed inside the concavity.

3. The light emitting device according to claim 2, wherein the translucent sealing resin is formed from a different material from that of the light transmitter layer.

4. The light emitting device according to claim 2, wherein a refractive index of the light transmitter layer is different from a refractive index of the translucent sealing resin.

5. The light emitting device according to claim 2, wherein the translucent sealing resin is formed by potting on the inside of the concavity.

6. The light emitting device according to claim 1, wherein the light reflector layer is formed from a white resin, and the light transmitter layer is formed from a transparent resin with a light transmissivity of at least 70%.

7. The light emitting device according to claim 1, wherein the height of the light reflector layer is at least 100% of the height of the light emitting element.

8. The light emitting device according to claim 1, wherein the height of the light transmitter layer is at least 30% of the height of the light reflector layer.

9. The light emitting device according to claim 1, wherein the translucent sealing resin contains a fluorescent material.

10. The light emitting device according to claim 1, wherein the side wall of the concavity includes a stepped face formed at an interface between the light transmitter layer and the light reflector layer.

11. The light emitting device according to claim 1, wherein a surface of the light reflector layer forming a part of the side wall of the concavity and a surface of the light transmitter layer forming another part of the side wall of the concavity are inclined at mutually different angles.

12. The light emitting device according to claim 1, wherein the light reflector layer and the light transmitter layer are formed from thermosetting resin.

13. The light emitting device according to claim 1, wherein the light reflector layer comprises a thermosetting resin.

14. A light emitting device comprising:

a light emitting element;

a package having

a light reflector layer configured and arranged such that a surface of the light reflector layer reflects light from the light emitting element, and

a light transmitter layer formed on the light reflector layer, and configured and arranged to transmit light from the light emitting element to the outside,

the light reflector layer and the light transmitter layer collectively define a concavity for holding the light emitting element, with a side wall of the concavity being partially formed by the surface of the light reflector layer and partially formed by a surface of the light transmitter layer; and

a translucent sealing resin that is packed on the inside of the concavity.

15. The light emitting device according to claim 14, wherein the translucent sealing resin is formed from a different material from that of the light transmitter layer.

16. The light emitting device according to claim 14, wherein the light reflector layer is formed from a white resin, and the light transmitter layer is formed from a transparent resin with a light transmissivity of at least 70%.

17. The light emitting device according to claim 14, wherein the height of the light reflector layer is at least 100% of the height of the light emitting element.

18. The light emitting device according to claim 14, wherein the height of the light transmitter layer is at least 30% of the height of the light reflector layer.

19. The light emitting device according to claim 14, wherein the translucent sealing resin contains a fluorescent material.

20. The light emitting device according to claim 14, wherein the side wall of the concavity includes a stepped face formed at an interface between the light transmitter layer and the light reflector layer.

21. The light emitting device according to claim 14, wherein a surface of the light reflector layer forming a part of the side wall of the concavity and a surface of the light transmitter layer forming another part of the side wall of the concavity are inclined at mutually different angles.

22. The light emitting device according to claim 14, wherein the light reflector layer and the light transmitter layer are formed from thermosetting resin.

23. The light emitting device according to claim 14, wherein a refractive index of the light transmitter layer is different from a refractive index of the translucent sealing resin.

24. The light emitting device according to claim 14, wherein the translucent sealing resin is formed by potting on the inside of the concavity.

25. The light emitting device according to claim 14, wherein the light reflector layer comprises a thermosetting resin.

26. A package for a light emitting device including a light emitting element, the package comprising:

a light reflector layer configured and arranged to reflect light from the light emitting element; and

a light transmitter layer formed on the light reflector layer, and configured and arranged to transmit light from the light emitting element to the outside,

the light reflector layer and the light transmitter layer collectively defining a concavity for holding the light emitting element, with a side wall of the concavity being partially formed by a surface of the light reflector layer and partially formed by a surface of the light transmitter layer.

27. The package for a light emitting device according to claim 26, wherein the light reflector layer comprises a thermosetting resin.