LIGHT EMITTING DEVICE

• US 20160351756A1
• Filed: 06/01/2015
• Published: 12/01/2016
• Est. Priority Date: 06/01/2015
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: NOICHI, Takuya, KAGEYAMA, Hiroaki
• Granted Patent: US 10,615,308 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 33/38 with a particular shape

Abstract

A light emitting device includes a base structure and a light emitting element. The light emitting element includes a first electrode and a second electrode. The first electrode includes a first electrode surface. The second electrode is separately provided from the first electrode. The second electrode includes a second electrode surface. The second electrode surface is spaced apart from the first electrode surface in a second direction different from a first direction. The second electrode surface includes a first part and a second part. The first part extends in a third direction different from each of the first direction and the second direction. The second part extends from the first part in the second direction. At least part of the second part has a curved profile extending from the first part when viewed in the first direction.

Claims

1. A light emitting device comprising:

a base structure including a first base surface and a second base surface opposite to the first base surface in a first direction; and

a light emitting element configured to emit light, the light emitting element comprising;

a first electrode including a first electrode surface exposed from the second base surface to an outside of the light emitting device; and

a second electrode separately provided from the first electrode, the base structure including an intermediate portion provided between the first electrode and the second electrode, the second electrode including a second electrode surface being spaced apart from the first electrode surface in a second direction different from the first direction, the second electrode surface comprising;

a first part extending longitudinally in a third direction different from each of the first direction and the second direction, the first part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device; and

a second part extending longitudinally from the first part in the second direction, at least part of the second part having a curved profile extending from the first part when viewed in the first direction, the second part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device.

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

the second part extends from the first part toward the first electrode surface in the second direction.

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

the second part includes extending portions extending from the first part in the second direction,

the extending portions are spaced apart from each other in the third direction,

the second electrode surface includes at least one curved edge defining at least part of the curved profile and extending from the first part, and

the at least one curved edge is provided between adjacent two of the extending portions.

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

the extending portions extend from the first part toward the first electrode surface in the second direction.

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

the first part has a first length defined in the second direction,

the extending portions respectively have second lengths defined in the second direction, and

at least one of the second lengths is longer than the first length.

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

at least two of the second lengths of the extending portions are substantially equal to each other.

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

at least one of the second lengths of the extending portions is longer than a minimum distance between the first electrode surface and the second electrode surface in the second direction.

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

at least one of the second lengths of the extending portions is longer than a maximum distance between adjacent two of the extending portions in the third direction.

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

the first part has a third length defined in the third direction,

the extending portions respectively have fourth lengths in the third direction, and

the fourth lengths are shorter than the third length.

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

the extending portions respectively has fourth lengths in the third direction, and

the fourth lengths are substantially equal to each other.

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

at least one of the extending portions includes a larger width portion and a smaller width portion,

the larger width portion has a first width defined in the third direction,

the smaller width portion has a second width defined in the third direction, and

the first width of the larger width portion is larger than the second width of the smaller width portion.

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

the extending portions includes a first extending portion, a second extending portion, and at least one third extending portion,

the at least one third extending portion is provided between the first extending portion and the second extending portion in the third direction,

the first extending portion has a first width defined in the third direction,

the second extending portion has a second width defined in the third direction,

the at least one third extending portion has a third width defined in the third direction, and

the third width is larger than the first width and the second width.

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

the first part has a first length defined in the second direction,

the second part has a second length defined in the second direction, and

the second length is longer than the first length.

14. The light emitting device according to claim 13, wherein

the second length is longer than a minimum distance between the first electrode surface and the second electrode surface in the second direction.

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

the light emitting element comprises a first semiconductor layer, a light emitting layer, and a second semiconductor layer coupled to the first semiconductor layer via the light emitting layer,

the first electrode includes a first contact surface contacting the first semiconductor layer, and

the second electrode surface is provided to avoid overlapping with an area of the first contact surface when viewed from the first direction.

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

the curved profile is spaced apart from the area of the first contact surface when viewed from the first direction.

17. The light emitting device according to claim 16, wherein

the second part includes extending portions extending from the first part in the second direction,

the extending portions are spaced apart from each other in the third direction,

the extending portions are provided to avoid overlapping with an area of the first contact surface when viewed from the first direction, and

at least one of the extending portions is arranged to face the area of the first contact surface in the second direction when viewed from the first direction.

18. The light emitting device according to claim 16, wherein

the first contact surface includes first contact parts and second contact parts,

the first contact parts are substantially aligned with each other in the third direction and each contact the first semiconductor layer,

the second contact parts are substantially aligned with each other in the third direction and each contact the first semiconductor layer, and

a total number of the second contact parts is different from a total number of the first contact parts.

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

the second base surface includes at least one intermediate area provided between the adjacent two of the extending portions in the third direction when viewed from the first direction, and

the at least one intermediate area includes a substantially round end defined by the at least one curved edge.

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

the base structure includes a base member in which each of the first electrode and the second electrode is partially embedded, and

the base member includes the intermediate portion.

21. The light emitting device according to claim 20, wherein

the base member includes a base portion and a wall protruding from the base portion in the first direction to surround the light emitting element, and

the base structure includes a light transmissive member provided between the wall and the light emitting element to cover the light emitting element.

22. The light emitting device according to claim 20, wherein

the base member includes a light reflection material to reflect light emitted from the light emitting element.

23. The light emitting device according to claim 20, wherein

the base structure includes a wavelength conversion member to convert a first wavelength of light emitted from the light emitting element to a second wavelength different from the first wavelength, and

the wavelength conversion member is provided on a side opposite to the second base surface relative to the light emitting element.

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

the base structure includes

a first straight side extending in the second direction when viewed from the first direction, and

a second straight side extending in the third direction when viewed from the first direction.

24. A light emitting device comprising:

a base structure including a first base surface and a second base surface opposite to the first base surface in a first direction; and

a light emitting element configured to emit light, the light emitting element comprising;

a first electrode including a first electrode surface exposed from the second base surface to an outside of the light emitting device; and

a second electrode separately provided from the first electrode, the base structure including an intermediate portion provided between the first electrode and the second electrode, the second electrode including a second electrode surface and a second contact surface, the second electrode surface being spaced apart from the first electrode surface in a second direction different from the first direction, the second contact surface being opposite to the second electrode surface in the first direction, the second electrode surface comprising;

a first part extending longitudinally in a third direction different from each of the first direction and the second direction, the first part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device; and

a second part extending longitudinally from the first part in the second direction, the second part overlapping with an area of the second contact surface when viewed from the first direction, the second part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device.

25. The light emitting device according to claim 24, wherein

the light emitting element includes a first semiconductor layer, a light emitting layer, and a second semiconductor layer coupled to the first semiconductor layer via the light emitting layer,

the light emitting element includes a second additional electrode contacting the second semiconductor layer, and

the second contact surface contacts the second additional electrode.

26. The light emitting device according to claim 24, wherein

the second contact surface includes at least one third contact part contacting the second additional electrode, and

the second part overlaps with an area of the at least one third contact part when viewed from the first direction.

27. The light emitting device according to claim 26, wherein

the second part includes extending portions extending from the first part in the second direction,

the extending portions are spaced apart from each other in the third direction, and

at least one of the extending portions overlaps with an area of the at least one third contact part when viewed from the first direction.

28. The light emitting device according to claim 26, wherein

the at least one third contact part includes third contact parts each contacting the second additional electrode, and

the third contact parts are arranged in the third direction.

29. The light emitting device according to claim 26, wherein

the second contact surface includes a fourth contact part contacting the second additional electrode,

the fourth contact part is spaced apart from the at least one third contact part, and

the first part overlaps with an area of the fourth contact part when viewed from the first direction.

30. The light emitting device according to claim 24, wherein

the base structure includes a base member in which each of the first electrode and the second electrode is partially embedded, and

the base member includes the intermediate portion.

31. The light emitting device according to claim 30, wherein

the base member includes a base portion and a wall protruding from the base portion in the first direction to surround the light emitting element, and

the base structure includes a light transmissive member provided between the wall and the light emitting element to cover the light emitting element.

36. The light emitting device according to claim 24, wherein

the base structure includes

a first straight side extending in the second direction when viewed from the first direction, and

a second straight side extending in the third direction when viewed from the first direction.

32. A light emitting device comprising:

a base structure including a first base surface and a second base surface opposite to the first base surface in a first direction; and

a light emitting element configured to emit light, the light emitting element comprising;

a first electrode including a first electrode surface exposed from the second base surface to an outside of the light emitting device; and

a second electrode separately provided from the first electrode surface, the base structure including an intermediate portion provided between the first electrode and the second electrode, the second electrode including a second electrode surface provided in the second base surface when viewed from the first direction, the second electrode surface being spaced apart from the first electrode surface in a second direction different from the first direction, the second electrode surface comprising;

a first part extending in a third direction different from each of the first direction and the second direction, the first part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device; and

a second part including extending portions extending from the first part in the second direction, the extending portions being spaced apart from each other in the third direction, each of the extending portions including a first end having a straight edge, the second part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device.

35. The light emitting device according to claim 32, wherein

the base structure includes

a first straight side extending in the second direction when viewed from the first direction, and

a second straight side extending in the third direction when viewed from the first direction.

33. A light emitting device comprising:

a base structure including a first base surface and a second base surface opposite to the first base surface in a first direction; and

a light emitting element configured to emit light, the light emitting element comprising;

a first semiconductor layer;

a first electrode comprising;

a first electrode surface exposed from the second base surface to an outside of the light emitting device; and

a first contact surface contacting the first semiconductor layer; and

a second electrode provided separately from the first electrode, the base structure including an intermediate portion provided between the first electrode and the second electrode, the second electrode including a second electrode surface being spaced apart from the first electrode surface in a second direction different from the first direction, the second electrode surface comprising;

a first part extending longitudinally in a third direction different from each of the first direction and the second direction, the first part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device; and

a second part extending longitudinally from the first part in the second direction, the second part being provided to avoid overlapping with an area of the first contact surface when viewed from the first direction, the second part of the second electrode surface being exposed from the second base surface to the outside of the light emitting device.

34. The light emitting device according to claim 33, wherein

the base structure includes

a first straight side extending in the second direction when viewed from the first direction, and

a second straight side extending in the third direction when viewed from the first direction.