Light emitting device

Patent metadata

Field	Value
Publication number	US-10910523-B2
Application number	US-201816004445-A
Country	US
Kind code	B2
Filing date	Jun 11, 2018
Priority date	May 14, 2014
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A light emitting device includes a wavelength conversion layer, at least one light emitting unit and a reflective protecting element. The wavelength conversion layer has an upper surface and a lower surface opposite to each other. The light emitting unit has two electrode pads located on the same side of the light emitting unit. The light emitting unit is disposed on the upper surface of the wavelength conversion layer and exposes the two electrode pads. The reflective protecting element encapsulates at least a portion of the light emitting unit and a portion of the wavelength conversion layer, and exposes the two electrode pads of the light emitting unit.

First claim

What is claimed is:

1. A light emitting device, comprising:
at least one light emitting unit, having electrodes disposed thereon;
a wavelength conversion layer, comprising a high concentration fluorescent layer and a low concentration fluorescent layer;
an adhesive layer, adhering the wavelength conversion layer to an upper surface of the light emitting unit opposite to the electrodes and encapsulating a portion of a lateral surface of the light emitting unit, wherein the high concentration fluorescent layer faces to the upper surface of the light emitting unit; and
a reflective layer, covering the light emitting unit, the adhesive layer and the wavelength conversion layer to expose an upper surface of the wavelength conversion layer and the electrodes, wherein a reflective surface of the reflective layer is inclined to the lateral surface of the light emitting unit and reflects a light emitted from the light emitting unit back into the high concentration fluorescent layer, wherein a lower surface of the reflective layer is higher than lower surfaces of the electrodes,
wherein the light emitting device has a flat lateral surface comprising the reflective layer, and the adhesive layer further comprises a portion disposed directly between the high concentration fluorescent layer and the light emitting unit.

2. The light emitting device as claimed in claim 1 , wherein the reflective surface of the reflective layer comprises a convex surface or a concave surface.

3. The light emitting device as claimed in claim 1 , wherein the light emitting unit has a light emitting body on which the electrodes are disposed, and the lower surface of the reflective layer is not lower than a bottom surface of the light emitting body.

4. The light emitting device as claimed in claim 3 , wherein the lower surface of the reflective layer is inclined to the lateral surface of the light emitting unit and recessed upwardly.

5. The light emitting device as claimed in claim 1 , wherein the lower surface of the reflective layer is inclined to the lateral surface of the light emitting unit and recessed upwardly.

6. The light emitting device as claimed in claim 1 , wherein the flat lateral surface of the light emitting device further comprises a portion of the low concentration fluorescent layer disposed on the reflective layer.

7. The light emitting device as claimed in claim 1 , wherein the light emitting device has an upper surface comprising the low concentration fluorescent layer.

8. The light emitting device as claimed in claim 7 , wherein the upper surface of the light emitting device further comprises a portion of the reflective layer surrounding the low concentration fluorescent layer.

9. A light emitting device, comprising:
at least one light emitting unit, having electrodes disposed thereon;
a wavelength conversion layer;
an adhesive layer, adhering the wavelength conversion layer to an upper surface of the light emitting unit opposite to the electrodes and encapsulating a portion of a lateral surface of the light emitting unit; and
a reflective layer, covering the light emitting unit, the adhesive layer and the wavelength conversion layer to expose an upper surface of the wavelength conversion layer and the electrodes, wherein a reflective surface of the reflective layer is inclined to the lateral surface of the light emitting unit and reflects a light emitted from the light emitting unit back into the wavelength conversion layer, wherein a lower surface of the reflective layer is higher than lower surfaces of the electrodes,
wherein the light emitting device has a flat lateral surface comprising the reflective layer, and has an upper surface comprising the wavelength conversion layer and the reflective layer surrounding the wavelength conversion layer.

10. The light emitting device as claimed in claim 9 , wherein the wavelength conversion layer comprises a high concentration fluorescent layer and a low concentration fluorescent layer, wherein the high concentration fluorescent layer faces to the light emitting unit.

11. The light emitting device as claimed in claim 9 , wherein the reflective surface of the reflective layer comprises a convex surface or a concave surface.

12. The light emitting device as claimed in claim 9 , wherein the light emitting unit has a light emitting body on which the electrodes are disposed, and the lower surface of the reflective layer is not lower than a bottom surface of the light emitting body.

13. The light emitting device as claimed in claim 12 , wherein
the lower surface of the reflective layer is inclined to the lateral surface of the light emitting body and recessed upwardly.

14. The light emitting device as claimed in claim 9 , wherein the lower surface of the reflective layer is inclined to the lateral surface of the light emitting unit and recessed upwardly.

Assignees

• Genesis Photonics Inc

Inventors

• Hung Cheng-Wei
• Hung Chin-Hua
• Du Long-Chi
• Chang Jui-Fu
• Kuo Po-Tsun
• Lee Hao-Chung
• Lin Yu-Feng

Classifications

• H10W74/142

  the encapsulations exposing the passive side of the semiconductor body · CPC title

• H10W72/0198

  batch processes · CPC title

• H10W72/874

  On different surfaces · CPC title

• H10W72/9413

  on encapsulations · CPC title

• H10W90/00

  Package configurations · CPC title