# US 10,873,008 B2 · Light emitting device and method of manufacturing same

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- Number: US 10,873,008 B2
- Document ID: US10873008B2
- Status: Granted
- Kind: B2
- Application number: 15/934,551
- Filed: 2018-03-23
- Published: 2018-09-27
- Granted: 2020-12-22
- Earliest claimed: 2017-03-24
- Assignees: Nichia Corporation
- Applicants: Nichia Corporation
- Inventors: Shusaku Bando; Takanobu Sogai; Satoshi Shichijo
- Web page: https://patentgrep.com/patent/US10873008B2

## CPC

- H10H 20/8512: {Wavelength conversion materials}
- H10H 20/8312: {extending at least partially through the bodies}
- H10H 20/8316: {Multi-layer electrodes comprising at least one discontinuous layer}
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- H10H 20/8515: {not being in contact with the bodies}
- H10H 20/853: characterised by their shape
- H10H 20/856: Reflecting means
- H10H 20/0362: {of encapsulations}
- H10H 20/8506: {Containers}
- H10H 20/854: characterised by their material, e.g. epoxy or silicone resins
- H10W 90/00: Package configurations
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A light emitting device including: a light emitting element, a phosphor plate, and a light guiding part. The lower face of the light emitting element has a rectangular shape. The light guiding part covers lateral faces of the light emitting element and the lower face of the phosphor plate that is exposed from the light emitting element. The light guiding part has one or more lateral faces having at least one of structures below: a height at both ends being different from the height at a central area; outer lateral faces being parallel to the lateral faces of the light emitting element.

## Claims

### Claim 1

A light emitting device comprising:
a light emitting element having an upper face, a lower face, lateral faces, and including a positive electrode and a negative electrode positioned on the lower face, the light emitting element emitting light from the upper face;
a phosphor plate configured with an inorganic material containing a phosphor, the phosphor plate having an upper face, lateral faces, and a lower face that is larger than the upper face of the light emitting element and is in direct contact with the upper face of the light emitting element, the lower face being generally planar; and
a light guiding part covering the lateral faces of the light emitting element and the lower face of the phosphor plate that is exposed from the light emitting element, wherein
the lower face of the light emitting element has a rectangular shape;
the light guiding part has a first outer side and a first inner side defined in a cross section perpendicular to the lower face that includes one of the two diagonal lines of the rectangular shape, the first outer side located at a first position farthest from the light emitting element within an area covering the lower face of the phosphor plate, wherein the first outer side has a height hd,
the light guiding part has a second outer side and a second inner side defined in a cross section perpendicular to the lower face that includes a line passing through an intersection of the two diagonal lines of the rectangular shape and in parallel to one side of the rectangular shape, the second outer side located at a second position farthest from the light emitting element within an area covering the lower face of the phosphor plate, wherein the second outer side has a height hc, and
the height hd is different from the height hc, and
wherein the first inner side of the light guiding part is longer than the first outer side of the light guiding part.

### Claim 2 (depends on 1)

The light emitting device according to claim 1 further comprising
a light reflecting part that covers the lateral faces of the phosphor plate and the light guiding part.

### Claim 3 (depends on 1)

The light emitting device according to claim 1, wherein
the height hd and the height hc satisfy the relationship: hd>hc.

### Claim 4 (depends on 1)

The light emitting device according to claim 1, wherein
the height hd and the height hc satisfy the relationship: hd<hc.

### Claim 5 (depends on 1)

The light emitting device according to claim 1, wherein the light emitting element is flip chip mounted on a mounting board.

### Claim 6 (depends on 1)

The light emitting device according to claim 1, wherein the thickness of the phosphor plate is 50 μm to 300 μm.

### Claim 7 (depends on 1)

The light emitting device according to claim 1, wherein an arithmetic average roughness of the lower face of the phosphor plate is 1 nm at most.

### Claim 8 (depends on 1)

The light emitting device according to claim 1, wherein the second inner side is longer than the second outer side.

### Claim 9

A light emitting device comprising:
a light emitting element having an upper face, a lower face, lateral faces, and including a positive electrode and a negative electrode positioned on the lower face, the light emitting element emitting light from the upper face;
a phosphor plate configured with an inorganic material containing a phosphor, the phosphor plate having an upper face, lateral faces, and a lower face that is larger than the upper face of the light emitting element and is in direct contact with the upper face of the light emitting element, the lower face being generally planar; and
a light guiding part covering the lateral faces of the light emitting element and the lower face of the phosphor plate that is exposed from the light emitting element, wherein
the lower face of the light emitting element has a rectangular shape;
the light guiding part has a first outer side and a first inner side defined in a cross section perpendicular to the lower face that includes one of the two diagonal lines of the rectangular shape, the first outer side located at a first position farthest from the light emitting element within an area covering the lower face of the phosphor plate, wherein the first outer side has a height hd,
the light guiding part has a second outer side and a second inner side defined in a cross section perpendicular to the lower face that includes a line passing through an intersection of the two diagonal lines of the rectangular shape and in parallel to one side of the rectangular shape, the second outer side located at a second position farthest from the light emitting element within an area covering the lower face of the phosphor plate, wherein the second outer side has a height hc, and
the height hd is different from the height hc, and
wherein the second inner side of the light guiding part is longer than the second outer side of the light guiding part.

### Claim 10 (depends on 9)

The light emitting device according to claim 9 further comprising
a light reflecting part that covers the lateral faces of the phosphor plate and the light guiding part.

### Claim 11 (depends on 9)

The light emitting device according to claim 9, wherein
the height hd and the height hc satisfy the relationship: hd>hc.

### Claim 12 (depends on 9)

The light emitting device according to claim 9, wherein
the height hd and the height hc satisfy the relationship: hd<hc.

### Claim 13 (depends on 9)

The light emitting device according to claim 9, wherein the light emitting element is flip chip mounted on a mounting board.

### Claim 14 (depends on 9)

The light emitting device according to claim 9, wherein the thickness of the phosphor plate is 50 μm to 300 μm.

### Claim 15 (depends on 9)

The light emitting device according to claim 9, wherein an arithmetic average roughness of the lower face of the phosphor plate is 1 nm at most.