LIGHT EMITTING ELEMENT AND LIGHT EMITTING DEVICE

• US 20190097086A1
• Filed: 09/06/2018
• Published: 03/28/2019
• Est. Priority Date: 09/25/2017
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: SHICHIJO, Satoshi, FUKUTA, Hiroki, SUGIMOTO, Kunihito
• Granted Patent: US 11,024,770 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 23/5329 Insulating materials
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/10 with a light reflecting structure, e.g. semiconductor Bragg reflector
• CPC Class Codes: H01L 33/32 containing nitrogen
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/382 the electrode extending partially in or entirely through the semiconductor body
• CPC Class Codes: H01L 33/387 with a plurality of electrode regions in direct contact with the semiconductor body and being electrically interconnected by another electrode layer
• CPC Class Codes: H01L 33/405 Reflective materials
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/54 having a particular shape
• 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 element includes a semiconductor layered body, an insulating film, first and second electrodes, and first and second external connection parts. The first semiconductor layer is exposed from the light emitting layer and the second semiconductor layer at exposed portions arranged in columns each extending in a first direction. The insulating film defines openings respectively located above the exposed portions. The first electrode is connected to the first semiconductor layer through the openings and covers a part of the second semiconductor layer via the insulating film. The first external connection part is connected to the first electrode and spaced apart from the exposed portions in the plan view. The first external connection part has a shape elongated in the first direction between adjacent ones of the columns of the exposed portions. The second external connection part is connected to the second semiconductor layer via the second electrode.

Claims

1. A light emitting element comprising:

a semiconductor layered body including

a first semiconductor layer,

a light emitting layer arranged over the first semiconductor layer, and

a second semiconductor layer arranged over the light emitting layer,

the first semiconductor layer being exposed from the light emitting layer and the second semiconductor layer at a plurality of exposed portions arranged in a plurality of columns with each of the columns extending in a first direction in a plan view;

an insulating film covering the semiconductor layered body and defining a plurality of openings respectively located above the exposed portions;

a first electrode electrically connected to the first semiconductor layer at the exposed portions through the openings in the insulating film, the first electrode covering a part of the second semiconductor layer with the insulating film being disposed between the first electrode and the second semiconductor layer;

a second electrode electrically connected to the second semiconductor layer;

a first external connection part electrically connected to the first electrode and spaced apart from the exposed portions in the plan view, the first external connection part having a shape elongated in the first direction and being arranged between adjacent ones of the columns of the exposed portions in the plan view; and

a second external connection part electrically connected to the second electrode.

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

the first external connection part includes a plurality of projecting portions extending in a second direction perpendicular to the first direction in the plan view.

3. The light emitting element according to claim 2, wherein

each of the projecting portions extends between adjacent ones of the exposed portions in a corresponding one of the columns.

4. The light emitting element according to claim 1, wherein

the first external connection part includes an end that is closer to an outer periphery of the light emitting element than an end of a corresponding one of the exposed portions located closest to the outer periphery of the light emitting element in the plan view.

5. The light emitting element according to claim 1, further comprising

an additional first external connection part electrically connected to the first electrode and having a shape elongated in the first direction in the plan view, wherein

the plurality of columns of the exposed portions includes a first column, a second column, and a third column, with the second column being disposed between the first column and the third column in the plan view, and

the first external connection part extends in a region between the first column and the second column, and the additional first external connection part extends in a region between the second column and the third column.

6. The light emitting element according to claim 1, further comprising

an additional first external connection part electrically connected to the first electrode and having a shape elongated in the first direction in the plan view, wherein

the second external connection part has a shape elongated in the first direction in the plan view, and the second external connection part is disposed between the first external connection part and the additional first external connection part.

7. The light emitting element according to claim 1, wherein

a number of the columns of the exposed portions is smaller than a number of the exposed portions arranged in each at the columns in the plan view.

8. The light emitting element according to claim 1, further comprising

an additional first external connection part electrically connected to the first electrode and having a shape elongated in the first direction in the plan view, wherein

the second external connection part has a shape elongated in a second direction perpendicular to the first direction in the plan view, and the second external connection part is disposed between the first external connection part and the additional first external connection part.

9. The light emitting element according to claim 1, wherein

a number of the columns of the exposed portions is greater than a number of the exposed portions arranged in each of the columns in the plan view.

10. The light emitting element according to claim 1, wherein

an uppermost layer of the first external connection part and an uppermost layer of the second external connection part are Au layers.

11. The light emitting element according to claim 1, wherein

each of the first external connection part and the second external connection part has a thickness in a range of 5 μ

m to 20 μ

m.

12. A light emitting device comprising:

the light emitting element according to claim 1;

a substrate including wiring patterns on an upper surface of the substrate, the first external connection part and the second external connection part of the light emitting element being electrically connected to the wiring patterns so that the light emitting element is flip-chip mounted on the wiring patterns; and

a covering member covering the substrate and the light emitting element including the first external connection part and the second external connection part.

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

the coverings member contains a light-reflective substance.

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

the covering member contains a resin.

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

a light-transmissive member arranged on an upper surface of the light emitting element.

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

the light-transmissive member contains a fluorescent material.

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

the substrate is made of alumina or aluminum nitride.

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

the covering member contains a resin.

19. A light emitting device comprising:

a substrate including wiring pattern;

a light emitting element including

a semiconductor layered body including a first semiconductor layer, a light emitting layer arranged over the first semiconductor layer, and a second semiconductor layer arranged over the light emitting layer, the first semiconductor layer being exposed from the light emitting layer and the second semiconductor layer at a plurality of exposed portions arranged in a plurality of columns with each of the columns extending in a first direction in a plan view,

an insulating film covering the semiconductor layered body and defining a plurality of openings respectively located above the exposed portions,

a first electrode electrically connected to the first semiconductor layer at the exposed portions through the openings in the insulating film, the first electrode covering a part of the second semiconductor layer with the insulating film being disposed between the first electrode and the second semiconductor layer, and

a second electrode electrically connected to the second semiconductor layer;

a first external connection part electrically connected to the first electrode and at least one of the wiring patterns, the first external connection part being spaced apart from the exposed portions in the plan view, the first external connection part having a shape elongated in the first direction and being arranged between adjacent ones of the columns of the exposed portions in the plan view; and

a second external connection part electrically connected to the second electrode and at least one of the wiring patterns.