# US 12,111,029 B2 · Light-emitting device

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- Number: US 12,111,029 B2
- Document ID: US12111029B2
- Status: Granted
- Kind: B2
- Application number: 18/534,571
- Filed: 2023-12-09
- Published: 2024-03-28
- Granted: 2024-10-08
- Earliest claimed: 2022-04-28
- Assignees: Nichia Corporation
- Applicants: Nichia Corporation
- Inventors: Tatsuya Hayashi; Shinya Okura
- Web page: https://patentgrep.com/patent/US12111029B2

## CPC

- F21S 41/176: Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
- H10H 29/24: comprising multiple light-emitting semiconductor devices
- F21S 41/141: Light emitting diodes [LED]
- H10H 29/8513: {having two or more wavelength conversion materials}
- H10H 29/8514: {characterised by their shape, e.g. plate or foil}
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A light-emitting device includes a substrate, a light-emitting element, a wavelength conversion layer, a light adjustment member, a light-transmissive member, and a covering member. The light-emitting element includes first and second light-emitting portions. The wavelength conversion layer contains a first phosphor that performs wavelength conversion of first light emitted from the first light-emitting portion and second light emitted from the second light-emitting portion into third light. The light adjustment member is disposed partially over the wavelength conversion layer and overlaps one of the first light-emitting portion and the second light-emitting portion in plan view. The light-transmissive member is disposed over the wavelength conversion layer and the light adjustment member. The covering member covers a side surface of the light-emitting element, a side surface of the wavelength conversion layer, a side surface of the light adjustment member, and a side surface of the light-transmissive member.

## Claims

### Claim 1

A light-emitting device comprising:
a substrate;
a light-emitting element disposed over the substrate, the light-emitting element including a first light-emitting portion and a second light-emitting portion, the first light-emitting portion and the second light-emitting portion each including a first semiconductor layer, a light-emitting layer, and a second semiconductor layer in this order;
a wavelength conversion layer disposed over the light-emitting element and containing a first phosphor that performs wavelength conversion of first light emitted from the first light-emitting portion and second light emitted from the second light-emitting portion into third light;
a light adjustment member disposed partially over the wavelength conversion layer and overlapping one of the first light-emitting portion and the second light-emitting portion in plan view;
a light-transmissive member disposed over the wavelength conversion layer and the light adjustment member; and
a covering member covering a side surface of the light-emitting element, a side surface of the wavelength conversion layer, a side surface of the light adjustment member, and a side surface of the light-transmissive member.

### Claim 2 (depends on 1)

The light-emitting device according to claim 1, wherein
a light emission peak wavelength of the first light is longer than the light emission peak wavelength of the second light.

### Claim 3 (depends on 2)

The light-emitting device according to claim 2, wherein
the light adjustment member contains the first phosphor at a concentration lower than a concentration of the first phosphor in the wavelength conversion layer, and
the light adjustment member overlaps the first light-emitting portion in plan view.

### Claim 4 (depends on 2)

The light-emitting device according to claim 2, wherein
the light adjustment member is configured to transmit light and contains no phosphor, and
the light adjustment member overlaps the first light-emitting portion in plan view.

### Claim 5 (depends on 2)

The light-emitting device according to claim 2, wherein
the light adjustment member includes a light diffusion member, and
the light adjustment member overlaps the first light-emitting portion in plan view.

### Claim 6 (depends on 5)

The light-emitting device according to claim 5, wherein
the light adjustment member has a lower surface inclined with respect to a surface of the substrate such that a thickness of the light adjustment member gradually decreases from an outer edge on a first light-emitting portion side to a second light-emitting portion side.

### Claim 7 (depends on 2)

The light-emitting device according to claim 2, wherein
the light adjustment member contains a phosphor that performs wavelength conversion of the second light, and
the light adjustment member overlaps the second light-emitting portion in plan view.

### Claim 8 (depends on 1)

The light-emitting device according to claim 1, wherein
during light emission of the light-emitting device, a current density of the first light-emitting portion is different from a current density of the second light-emitting portion.

### Claim 9 (depends on 1)

The light-emitting device according to claim 1, wherein
the light-transmissive member, the light adjustment member, and the wavelength conversion layer as a whole define a flat plate shape with a uniform thickness.

### Claim 10 (depends on 1)

The light-emitting device according to claim 1, wherein
in plan view, an area of the first light-emitting portion is different from an area of the second light-emitting portion.

### Claim 11 (depends on 1)

The light-emitting device according to claim 1, wherein
in plan view, an area of the first light-emitting portion is larger than an area of the second light-emitting portion.

### Claim 12 (depends on 1)

The light-emitting device according to claim 1, wherein
the substrate includes a wiring serially connecting the first light-emitting portion and the second light-emitting portion.

### Claim 13 (depends on 1)

The light-emitting device according to claim 1, wherein
during light emission of the light-emitting device, luminance on a first light-emitting portion side of a light-emitting surface of the light-emitting device is different from luminance on a second light-emitting portion side of the light-emitting surface of the light-emitting device.