Light-emitting device comprising partition including overhang portion

Patent metadata

Field	Value
Publication number	US-9728693-B2
Application number	US-201314054021-A
Country	US
Kind code	B2
Filing date	Oct 15, 2013
Priority date	Oct 17, 2012
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Occurrence of a crosstalk phenomenon in a light-emitting device including a tandem element is suppressed. A light-emitting device includes: lower electrodes over an insulating layer; a partition over a portion between the lower electrodes, which includes an overhang portion over an end portion of each of the lower electrodes; a first light-emitting unit over each of the lower electrodes and the partition; an intermediate layer over the first light-emitting unit; a second light-emitting unit over the intermediate layer; and an upper electrode over the second light-emitting unit. The distance between the overhang portion and each of the lower electrodes is larger than the total thickness of the first light-emitting unit and the intermediate layer over the lower electrode.

First claim

What is claimed is:

1. A light-emitting device comprising:
a first electrode and a second electrode over an insulating layer;
a partition over a portion between the first electrode and the second electrode, the partition including an overhang portion over an end portion of each of the first electrode and the second electrode;
a first light-emitting unit over a top surface of the first electrode, a curved top surface of the partition, and a top surface of the second electrode;
a first intermediate layer over a top surface of the first light-emitting unit;
a second light-emitting unit over a top surface of the first intermediate layer; and
a third electrode over a top surface of the second light-emitting unit and the curved top surface of the partition,
wherein a distance between a bottom surface of the overhang portion and each of the top surface of the first electrode and the top surface of the second electrode is larger than a total thickness of the first light-emitting unit and the first intermediate layer over the first electrode,
wherein the bottom surface faces each of the top surface of the first electrode and the top surface of the second electrode,
wherein the insulating layer, each of the first electrode and the partition, the first light-emitting unit, the first intermediate layer, the second light-emitting unit, and the third electrode are sequentially stacked, and
wherein a shape of the overhang portion is a forward tapered shape.

2. The light-emitting device according to claim 1 , wherein the distance between the bottom surface of the overhang portion and each of the top surface of the first electrode and the top surface of the second electrode is smaller than or equal to a total thickness of the first light-emitting unit, the first intermediate layer, the second light-emitting unit, and the third electrode over the first electrode.

3. The light-emitting device according to claim 1 , further comprising a spacer between the overhang portion and the end portion of each of the first electrode and the second electrode.

4. The light-emitting device according to claim 1 ,
wherein the partition is formed between the first electrode and the second electrode so as to be in contact with the end portion of each of the first electrode and the second electrode, and
wherein the first electrode and the second electrode are electrically isolated from each other by the partition.

5. The light-emitting device according to claim 1 , further comprising a spacer between the first electrode and the second electrode so as to be in contact with the end portion of each of the first electrode and the second electrode,
wherein the first electrode and the second electrode are electrically isolated from each other by the spacer.

6. The light-emitting device according to claim 1 , wherein a space is formed between the overhang portion and each of the first electrode and the second electrode.

7. The light-emitting device according to claim 1 , wherein the first light-emitting unit comprises a carrier-injection layer.

8. The light-emitting device according to claim 1 , further comprising a color filter over the first electrode and the second electrode,
wherein the color filter has a first color and a second color so as to overlap with the first electrode and the second electrode, respectively.

9. A light-emitting device comprising:
a first electrode and a second electrode over an insulating layer;
a partition over a portion between the first electrode and the second electrode, the partition including an overhang portion over an end portion of each of the first electrode and the second electrode;
a first light-emitting unit over a top surface of the first electrode, a curved top surface of the partition, and a top surface of the second electrode;
a first intermediate layer over a top surface of the first light-emitting unit;
a second light-emitting unit over a top surface of the first intermediate layer; and
a third electrode over a top surface of the second light-emitting unit and the curved top surface of the partition,
wherein the first intermediate layer is disconnected between a bottom surface of the overhang portion and the top surface of the first electrode,
wherein the bottom surface faces each of the top surface of the first electrode and the top surface of the second electrode,
wherein the insulating layer, each of the first electrode and the partition, the first light-emitting unit, the first intermediate layer, the second light-emitting unit, and the third electrode are sequentially stacked, and
wherein a shape of the overhang portion is a forward tapered shape.

10. The light-emitting device according to claim 1 , wherein the third electrode is continuously formed from the first electrode to the curved top surface of the partition.

11. The light-emitting device according to claim 10 , further comprising a second intermediate layer,
wherein the first electrode and the first intermediate layer are included in a first pixel,
wherein the second electrode and the second intermediate layer are included in a second pixel,
wherein the third electrode is continuous between the first pixel and the second pixel via the partition, and
wherein the first intermediate layer in the first pixel is disconnected from the second intermediate layer in the second pixel by the partition.

12. The light-emitting device according to claim 9 , wherein the third electrode is continuously formed from the first electrode to the curved top surface of the partition.

13. The light-emitting device according to claim 12 , further comprising a second intermediate layer,
wherein the first electrode and the first intermediate layer are included in a first pixel,
wherein the second electrode and the second intermediate layer are included in a second pixel,
wherein the third electrode is continuous between the first pixel and the second pixel via the partition, and
wherein the first intermediate layer in the first pixel is disconnected from the second intermediate layer in the second pixel by the partition.

14. A light-emitting device comprising:
a pixel including a first sub-pixel and a second sub-pixel;
a first electrode and a second electrode over an insulating layer;
a partition over a portion between the first electrode and the second electrode, the partition including an overhang portion over an end portion of each of the first electrode and the second electrode;
a first light-emitting unit over a top surface of the first electrode, a curved top surface of the partition, and a top surface of the second electrode;
an intermediate layer over a top surface of the first light-emitting unit;
a second light-emitting unit over a top surface of the intermediate layer;
a third electrode over a top surface of the second light-emitting unit and the curved top surface of the partition; and
a first spacer between the overhang portion and the end portion of the first electrode,
wherein each of the first sub-pixel and the second sub-pixel includes a first light-emitting portion and a second light-emitting portion adjacent to the first light-emitting portion in a column direction,
wherein the first light-emitting portion of the first sub-pixel and the second light-emitting portion of the first sub-pixel emit light of the same color,
wherein the first light-emitting portion of the first sub-pixel and the first light-emitting portion of the second sub-pixel are provided in a row,
wherein the first light-emitting portion of the first sub-pixel and the first light-emitting portion of the second sub-pixel emit light of different colors,

Assignees

• Hatano Kaoru
• Hamada Takashi
• Miyata Kikuo
• Katsui Hiromitsu
• Okazaki Shoji
• Semiconductor Energy Lab
• Sharp Kk

Inventors

• Hatano Kaoru
• Hamada Takashi
• Miyata Kikuo
• Katsui Hiromitsu
• Okazaki Shoji

Classifications

• H01L33/62 Primary

  Electricity · mapped topic

• H01L33/005

  Electricity · mapped topic

• H01L2924/00

  Electricity · mapped topic

• H01L27/322

  Electricity · mapped topic

• H01L51/5278

  Electricity · mapped topic