Organic light-emitting display device, manufacturing method thereof, and display panel

Patent metadata

Field	Value
Publication number	US-12150327-B2
Application number	US-202017262755-A
Country	US
Kind code	B2
Filing date	Sep 10, 2020
Priority date	Jul 6, 2020
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

An organic light-emitting diode display device is provided by the present application, including an anode layer, a cathode layer, and a light-emitting layer disposed between the anode layer and the cathode layer, wherein the light-emitting layer includes a first light-emitting layer and a second light-emitting layer stacked. The first light-emitting layer includes a first color light-emitting part, a second color light-emitting part, and a third color light-emitting part arranged in a same layer. The second light-emitting layer is configured to emit light of a first color, and the second light-emitting layer is disposed at a side of the first light-emitting layer and covers the first light-emitting layer.

First claim

What is claimed is:

1. An organic light-emitting diode display device, comprising an anode layer, a cathode layer, and a light-emitting layer disposed between the anode layer and the cathode layer, wherein the light-emitting layer comprises a first light-emitting layer and a second light-emitting layer stacked; the first light-emitting layer comprises a first color light-emitting part, a second color light-emitting part, and a third color light-emitting part arranged in a same layer; the second light-emitting layer is configured to emit light of a first color; and the second light-emitting layer is disposed at a side of the first light-emitting layer and covers the first light-emitting layer;
wherein the first color light-emitting part comprises a first host material, and the second light-emitting layer comprises a fourth host material; and the second light-emitting layer is disposed between the cathode and the first light-emitting layer, and a highest occupied molecular orbital energy level of the fourth host material is lower than a highest occupied molecular orbital energy level of the first host material; and
both of the first color light-emitting part and the second light-emitting layer are blue light-emitting layers.

2. The organic light-emitting diode display device in claim 1 , wherein the first color light-emitting part comprises a first guest material, the second color light-emitting part comprises a second host material, the third color light-emitting part comprises a third host material, and the second light-emitting layer comprises a fourth guest material.

3. The organic light-emitting diode display device in claim 2 , wherein a first triplet excited state energy level of the fourth host material is higher than a first triplet excited state energy level of the second host material and a first triplet excited state energy level of the third host material.

4. The organic light-emitting diode display device in claim 2 , wherein the fourth host material comprises an electron-transmission type light-emitting material, and the first host material comprises a hole-transmission type light-emitting material.

5. The organic light-emitting diode display device in claim 4 , wherein a doping concentration of the first guest material in the first color light-emitting part is higher than a doping concentration of the fourth guest material in the second light-emitting layer.

6. The organic light-emitting diode display device as claimed in claim 2 , wherein a doping concentration of the first guest material in the first color light-emitting part is higher than a doping concentration of the fourth guest material in the second light-emitting layer.

7. The organic light-emitting diode display device in claim 1 , wherein the first color light-emitting part comprises a first guest material, and a doping concentration of the first guest material in the first color light-emitting part 311 is 3% to 5%; and the second light-emitting layer comprises a fourth guest material, and a doping concentration of the fourth guest material in the second light-emitting layer is less than 3%.

8. A manufacturing method of an organic light-emitting diode display device, comprising steps of:
forming an anode layer;
forming a light-emitting layer on the anode layer, wherein the light-emitting layer comprises a first light-emitting layer and a second light-emitting layer stacked;
the first light-emitting layer comprises a first color light-emitting part, a second color light-emitting part, and a third color light-emitting part arranged in a same layer; the second light-emitting layer is configured to emit light of a first color; the second light-emitting layer is disposed at a side of the first light-emitting layer and covers the first light-emitting layer; the first light-emitting layer is formed through an evaporation process with a fine mask; and the second light-emitting layer is formed through an evaporation process with a non-fine mask; and
forming a cathode layer on the light-emitting layer to obtain the organic light-emitting diode display device;
wherein the first color light-emitting part comprises a first host material, and the second light-emitting layer comprises a fourth host material; and the second light-emitting layer is disposed between the cathode and the first light-emitting layer, and a highest occupied molecular orbital energy level of the fourth host material is lower than a highest occupied molecular orbital energy level of the first host material; and
both of the first color light-emitting part and the second light-emitting layer are blue light-emitting layers.

9. A display panel, comprising an organic light-emitting diode display device, wherein the organic light-emitting diode display device comprises an anode layer, a cathode layer, and a light-emitting layer disposed between the anode layer and the cathode layer, wherein the light-emitting layer comprises a first light-emitting layer and a second light-emitting layer stacked; the first light-emitting layer comprises a first color light-emitting part, a second color light-emitting part, and a third color light-emitting part arranged in a same layer; the second light-emitting layer is configured to emit light of a first color; and the second light-emitting layer is disposed at a side of the first light-emitting layer and covers the first light-emitting layer;
wherein the first color light-emitting part comprises a first host material, and the second light-emitting layer comprises a fourth host material; and the second light-emitting layer is disposed between the cathode and the first light-emitting layer, and a highest occupied molecular orbital energy level of the fourth host material is lower than a highest occupied molecular orbital energy level of the first host material; and
both of the first color light-emitting part and the second light-emitting layer are blue light-emitting layers.

10. The display panel in claim 9 , wherein the first color light-emitting part comprises a first guest material, the second color light-emitting part comprises a second host material, the third color light-emitting part comprises a third host material, and the second light-emitting layer comprises a fourth guest material.

11. The display panel in claim 10 , wherein a first triplet excited state energy level of the fourth host material is higher than a first triplet excited state energy level of the second host material and a first triplet excited state energy level of the third host material.

12. The display panel in claim 10 , wherein the fourth host material comprises an electron-transmission type light-emitting material, and the first host material comprises a hole-transmission type light-emitting material.

13. The display panel in claim 9 , wherein the first color light-emitting part comprises a first guest material, and a doping concentration of the first guest material in the first color light-emitting part 311 is 3% to 5%; and the second light-emitting layer comprises a fourth guest material, and a doping concentration of the fourth guest material in the second light-emitting layer is less than 3%.

Assignees

• Wuhan China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Li Weiwei

Classifications

• H10K2101/40

  Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers · CPC title

• H10K59/1201

  Manufacture or treatment · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title