Light-emitting device

Patent metadata

Field	Value
Publication number	US-2024234645-A9
Application number	US-202318401587-A
Country	US
Kind code	A9
Filing date	Dec 31, 2023
Priority date	Apr 28, 2017
Publication date	Jul 11, 2024
Grant date	—

Abstract

A light-emitting device includes a substrate comprising a base member, a first wiring, a second wiring, and a via hole; at least one light-emitting element electrically connected to and disposed on the first wiring; and a covering member having light reflectivity and covering a lateral surface of the light-emitting element and a front surface of the substrate. The base member defines a plurality of depressed portions separated from the via hole in a front view and opening on a back surface and a bottom surface of the base member. The substrate includes a third wiring covering at least one of inner walls of the plurality of depressed portions and electrically connected to the second wiring. A depth of each of the plurality of depressed portions defined from the back surface toward the front surface is larger on a bottom surface side than on an upper surface side of the base member.

First claim

What is claimed is:

1 . A light-emitting device comprising:
a base member that has a first surface and a second surface opposite to the first surface; a first light-emitting element that has a third surface facing the first surface and a fourth surface opposite to the third surface, the first light-emitting element having an emission peak wavelength in the range of 430 nm to less than 490 nm; a second light-emitting element that has a fifth surface facing the first surface and a sixth surface opposite to the fifth surface, the second light-emitting element having an emission peak wavelength in the range of 490 nm to less than 570 nm; and a light-transmissive member that covers the fourth surface, the light-transmissive member including a first wavelength conversion substance that emits green light and a second wavelength conversion substance that emits red light.

2 . The light-emitting device according to claim 1 , wherein
the base member has a seventh surface located between the first surface and the second surface and includes a depressed portion that opens on the second surface and the seventh surface.

3 . The light-emitting device according to claim 2 , wherein
the base member includes a first wiring disposed on the first surface, a second wiring disposed on the second surface, and a via hole that electrically connects the first wiring and the second wiring, and the via hole is separated from the depressed portion as seen from the second surface.

4 . The light-emitting device according to claim 2 , wherein
in a sectional view, the depressed portion includes an inclined portion inclined from the seventh surface toward a direction in which a thickness of the base member increases.

5 . The light-emitting device according to claim 4 , wherein
in the sectional view, the depressed portion includes a parallel portion extending in a direction parallel to the seventh surface.

6 . The light-emitting device according to claim 1 , wherein
the light-transmissive member covers the sixth surface.

7 . The light-emitting device according to claim 1 , wherein
the first wavelength conversion substance includes a β-SiAlON phosphor.

8 . The light-emitting device according to claim 1 , wherein
the second wavelength conversion substance has a composition represented by a general formula A 2 MF 6 :Mn 4+ , wherein A is at least one selected from the group consisting of K, Li, Na, Rb, Cs, and NH 4+ , and M is at least one element selected from the group consisting of the group IV elements and the group XIV elements.

9 . The light-emitting device according to claim 1 , wherein
the first light-emitting element has an eighth surface located between the third surface and the fourth surface, the second light-emitting element has a ninth surface located between the fifth surface and the sixth surface, and the light-emitting device further comprises a light-guiding member that covers the eighth surface and the ninth surface, the light-guiding member being separated from the base member.

10 . The light-emitting device according to claim 1 , wherein
the first light-emitting element has an eighth surface located between the third surface and the fourth surface, the second light-emitting element has a ninth surface located between the fifth surface and the sixth surface, and the light-emitting device further comprises a covering member that covers the first surface, the eighth surface, and the ninth surface.

11 . The light-emitting device according to claim 10 , wherein
the covering member is in contact with the first surface, the third surface, and the fifth surface.

12 . The light-emitting device according to claim 10 , wherein
the covering member covers the third surface and the fifth surface, and in a sectional view, a maximum thickness of a portion of the covering member located between the first light-emitting element and the second light-emitting element is larger than a maximum thickness of another portion of the covering member covering the third surface, and is larger than a maximum thickness of yet another portion of the covering member covering the fifth surface.

Assignees

• Nichia Corp

Inventors

• Nakabayashi Takuya
• Maruyama Tomokazu
• Ishikawa Tetsuya

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/857

  Interconnections, e.g. lead-frames, bond wires or solder balls · CPC title

• H10H20/841

  Reflective coatings, e.g. dielectric Bragg reflectors · CPC title

• H10H20/8312

  extending at least partially through the bodies · CPC title

• H10H29/142

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title