Light-emitting diode and driving method therefor, and light source apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-12310148-B2
Application number	US-202117762654-A
Country	US
Kind code	B2
Filing date	May 17, 2021
Priority date	May 27, 2020
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A light emitting diode including saturable absorber layer is provided. The light emitting diode includes: a substrate; a reflective light-emitting layer disposed on the substrate; a first electrode, a second electrode, and a first insulating layer which are discretely disposed on the reflective light-emitting layer; a saturable absorber layer disposed on the first insulating layer; and a third electrode, a fourth electrode, and a reflective composite layer which are disposed on the saturable absorber layer, respectively, the reflectivity of the reflective light-emitting layer is greater than the reflectivity of the reflective composite layer; wherein the orthographic projections of the saturable absorber layer, the third electrode, the fourth electrode, and the reflective composite layer on the reflective light-emitting layer, respectively, do not overlap with the first electrode and the second electrode.

First claim

The invention claimed is:

1. A light emitting diode, comprising:
a substrate;
a reflective light-emitting layer disposed on the substrate;
a first electrode, a second electrode, and a first insulating layer, wherein the first electrode, the second electrode, and the first insulating layer are separately disposed on the reflective light-emitting layer;
a saturable absorber layer, wherein the saturable absorber layer is disposed on the first insulating layer; and
a third electrode, a fourth electrode, and a reflective composite layer, wherein the third electrode, the fourth electrode, and the reflective composite layer are separately disposed on the saturable absorber layer, and a reflectivity of the reflective light-emitting layer is greater than the reflectivity of the reflective composite layer;
wherein the orthographic projections of the saturable absorber layer, the third electrode, the fourth electrode, and the reflective composite layer on the reflective light-emitting layer do not overlap with the first electrode and the second electrode,
wherein the light emitting diode further comprises:
an optical amplifier layer, wherein the optical amplifier layer is disposed on the reflective composite layer; and
a fifth electrode and a sixth electrode, wherein the fifth electrode and the sixth electrode are disposed on the optical amplifier layer separately;
wherein the orthographic projections of the optical amplifier layer, the fifth electrode, and the sixth electrode on the reflective light-emitting layer do not overlap with the first electrode and the second electrode; the orthographic projections of the optical amplifier layer, the fifth electrode, and the sixth electrode on the saturable absorber layer do not overlap with the third electrode and the fourth electrode.

2. The light emitting diode according to claim 1 , wherein the saturable absorber layer comprises:
a first P-type semiconductor layer, wherein the first P-type semiconductor layer is disposed on the first insulating layer, and the third electrode is disposed on the first P-type semiconductor layer;
a first quantum well layer, wherein the first quantum well layer is disposed on the first P-type semiconductor layer, and the orthographic projection of the first quantum well layer on the first P-type semiconductor layer does not overlap with the third electrode; and
a first N-type semiconductor layer, wherein the first N-type semiconductor layer is disposed on the first quantum well layer, the orthographic projection of the first N-type semiconductor layer on the first P-type semiconductor layer does not overlap with the third electrode, and the fourth electrode is disposed on the first N-type semiconductor layer.

3. The light emitting diode according to claim 1 , wherein the reflective light-emitting layer comprises:
a P-type semiconductor reflective composite layer, wherein the P-type semiconductor reflective composite layer is disposed on the substrate, and the first electrode is disposed on the P-type semiconductor reflective composite layer;
a second quantum well layer, wherein the second quantum well layer is disposed on the P-type semiconductor reflective composite layer, and the orthographic projection of the second quantum well layer on the P-type semiconductor reflective composite layer does not overlap with the first electrode; and
a second N-type semiconductor layer, wherein the second N-type semiconductor layer is disposed on the second quantum well layer, the orthographic projection of the second N-type semiconductor layer on the P-type semiconductor reflective composite layer does not overlap with the first electrode, and the second electrode is disposed on the second N-type semiconductor layer.

4. The light emitting diode according to claim 3 , wherein the P-type semiconductor reflective composite layer is provided with a mirror structure; or,
the P-type semiconductor reflective composite layer comprises a second P-type semiconductor layer and a first mirror layer disposed in stack, the first mirror layer is disposed close to the substrate.

5. The light emitting diode according to claim 1 , wherein the optical amplifier layer comprises:
a third P-type semiconductor layer, wherein the P-type semiconductor layer is disposed on the reflective composite layer, and the fifth electrode is disposed on the third P-type semiconductor layer;
a third quantum well layer, wherein the third quantum well layer is disposed on the third P-type semiconductor layer, the orthographic projection of the third quantum well layer on the third P-type semiconductor layer does not overlap with the fifth electrode; and
a third N-type semiconductor layer disposed on the third quantum well layer, wherein the orthographic projection of the third N-type semiconductor layer on the third P-type semiconductor layer does not overlap with the fifth electrode, and the sixth electrode is disposed on the third N-type semiconductor layer.

6. The light emitting diode according to claim 1 , wherein the fifth electrode and the sixth electrode are anode and cathode of the optical amplifier layer, respectively.

7. The light emitting diode according to claim 1 , wherein the reflective composite layer is provided with a mirror structure and uses an insulating material; or,
the reflective composite layer comprises a second insulating layer and a second mirror layer disposed in stack.

8. The light emitting diode according to claim 1 , wherein the first electrode and the second electrode are the anode and cathode of the reflective light-emitting layer, respectively, and the third electrode and the fourth electrode are the cathode and anode of the saturable absorber layer, respectively.

9. A light source apparatus, wherein the light source apparatus comprises a light emitting diode, wherein the light emitting diode comprises:
a substrate;
a reflective light-emitting layer disposed on the substrate;
a first electrode, a second electrode, and a first insulating layer, wherein the first electrode, the second electrode, and the first insulating layer are separately disposed on the reflective light-emitting layer;
a saturable absorber layer, wherein the saturable absorber layer is disposed on the first insulating layer; and
a third electrode, a fourth electrode, and a reflective composite layer, wherein the third electrode, the fourth electrode, and the reflective composite layer are separately disposed on the saturable absorber layer, and a reflectivity of the reflective light-emitting layer is greater than the reflectivity of the reflective composite layer;
wherein the orthographic projections of the saturable absorber layer, the third electrode, the fourth electrode, and the reflective composite layer on the reflective light-emitting layer do not overlap with the first electrode and the second electrode,
wherein the light emitting diode further comprises:
an optical amplifier layer, wherein the optical amplifier layer is disposed on the reflective composite layer; and
a fifth electrode and a sixth electrode, wherein the fifth electrode and the sixth electrode are disposed on the optical amplifier layer separately;
wherein the orthographic projections of the optical amplifier layer, the fifth electrode, and the sixth electrode on the reflective light-emitting layer do not overlap with the first electrode and the second electrode; the orthographic projections of the optical amplifier layer, the fifth electrode, and the sixth electrode on the saturable absorber layer do not overlap with the third electrode and the fourth electrode.

10. An electronic device, wherein the electronic device comprises the light source apparatus according to claim 9 .

Assignees

• Beijing Boe Display Tech Co
• Boe Technology Group Co Ltd

Inventors

• Xie Xiao
• Liu Yang
• Chen Huabin
• Li Xingliang
• Gao Yingqiang
• Wang Linlin
• Wang Ruirui

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/8312

  extending at least partially through the bodies · CPC title

• H10H20/814

  having reflecting means, e.g. semiconductor Bragg reflectors · CPC title

• H10H20/812

  within the light-emitting regions, e.g. having quantum confinement structures · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title