Light-emitting component and method for manufacturing the same, display substrate and display device

Patent metadata

Field	Value
Publication number	US-12336371-B2
Application number	US-202117516402-A
Country	US
Kind code	B2
Filing date	Nov 1, 2021
Priority date	Jan 22, 2021
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

The present application provides a light-emitting component and a method for manufacturing the same, a display substrate, and a display device. The light-emitting component comprises: an anode layer stacked on one side of a base, a first functional layer group including a plurality of functional layers, an organic light-emitting layer, a second functional layer group including a plurality of functional layers, and a cathode layer; the first functional layer group comprises a hole injection delaying layer close to the organic light-emitting layer, and the hole injection delaying layer is used for reducing a hole transport rate; and/or the second functional layer group comprises an electron injection delaying layer close to the organic light-emitting layer, and the electron injection delaying layer is used for reducing an electron transport rate.

First claim

What is claimed is:

1. A light-emitting component, comprising: an anode layer, a first functional layer group comprising a plurality of functional layers, an organic light-emitting layer, a second functional layer group comprising a plurality of functional layers, and a cathode layer, which layers are stacked on one side of a base;
the first functional layer group comprises a hole injection retarding layer close to the organic light-emitting layer, and the hole injection retarding layer is used for reducing a hole transport rate; and/or,
the second functional layer group comprises an electron injection retarding layer close to the organic light-emitting layer, and the electron injection retarding layer is used for reducing an electron transport rate;
wherein in a direction away from the anode layer, the first functional layer group comprises a hole transport layer and the hole injection retarding layer stacked sequentially; or
the first functional layer group comprises a hole transport layer, wherein doping particles for reducing the hole transport rate are distributed in the hole transport layer, and the hole transport layer is reused as the hole injection retarding layer.

2. The light-emitting component according to claim 1 , wherein a HOMO level of the hole injection retarding layer is a first ionization energy, and a HOMO level of the hole transport layer is a second ionization energy; and an absolute value of the first ionization energy is greater than an absolute value of the second ionization energy.

3. The light-emitting component according to claim 2 , wherein a difference between the absolute value of the first ionization energy and the absolute value of the second ionization energy is 0.19 eV to 0.29 eV.

4. The light-emitting component of claim 2 , wherein the first functional layer group further comprises: an electron blocking layer located between the hole transport layer and the hole injection retarding layer for blocking electrons from entering the hole transport layer;
a HOMO energy level of the electron blocking layer is a third ionization energy, and the absolute value of the first ionization energy is greater than an absolute value of the third ionization energy; and
a difference between the absolute value of the first ionization energy and the absolute value of the third ionization energy is 0.07 eV to 0.2 eV.

5. The light-emitting component according to claim 4 , wherein a ratio of a hole mobility of the electron blocking layer to a hole mobility of the hole injection retarding layer ranges from 10 to 100.

6. The light-emitting component according to claim 1 , wherein the hole injection retarding layer comprises a plurality of hole retarding sub-film layers which are stacked, and absolute values of HOMO levels corresponding to respective hole retarding sub-film layers in the hole injection retarding layer sequentially increase in a direction from the anode layer to the cathode layer.

7. The light-emitting component according to claim 1 , wherein the material of the hole injection retarding layer comprises a planar aromatic compound having a conjugated structure.

8. The light-emitting component according to claim 1 , wherein the material of the dopant particles comprises a planar aromatic compound having a conjugated structure.

9. The light-emitting component according to claim 1 , wherein, in a direction away from the cathode layer, the second functional layer group comprises an electron transport layer and the electron injection retarding layer which are sequentially stacked; or
the second functional layer group comprises an electron transport layer, wherein doping particles for reducing the electron transport rate are distributed in the electron transport layer, and the electron transport layer is reused as the electron injection retarding layer.

10. The light-emitting component according to claim 9 , wherein a LUMO level of the electron injection retarding layer is a fourth ionization energy, and a LUMO level of the electron transport layer is a fifth ionization energy; and an absolute value of the fourth ionization energy is greater than an absolute value of the fifth ionization energy.

11. The light-emitting component according to claim 10 , wherein a difference between the absolute value of the fourth ionization energy and the absolute value of the fifth ionization energy is 0.19 eV to 0.29 eV.

12. The light-emitting component according to claim 9 , wherein the second functional layer group further comprises: a hole blocking layer located between the electron transport layer and the electron injection retarding layer for blocking electrons from entering the electron transport layer;
a LUMO level of the hole blocking layer is a sixth ionization energy, and the absolute value of the fourth ionization energy is greater than an absolute value of the sixth ionization energy; and
a difference between the absolute value of the fourth ionization energy and the absolute value of the sixth ionization energy is 0.07 eV to 0.2 eV.

13. The light-emitting component according to claim 12 , wherein a ratio of an electron mobility of the hole blocking layer to an electron mobility of the electron injection retarding layer ranges from 10 to 100.

14. The light-emitting component according to claim 9 , wherein the electron injection retarding layer comprises a plurality of electron retarding sub-film layers which are stacked, and the absolute values of LUMO levels corresponding to respective electron retarding sub-film layers in the electron injection retarding layer sequentially increase in a direction from the cathode layer to the anode layer.

15. The light-emitting component according to claim 9 , wherein the material of the electron injection retarding layer comprises triazines or pyridine.

16. The light-emitting component of claim 1 , wherein the first functional layer group further comprises a hole injection layer between the anode layer and the hole transport layer; the second functional layer group further comprises an electron injection layer located between the cathode layer and the electron transport layer; and/or the material of the organic light-emitting layer is a phosphorescent material.

17. A display substrate, comprising: a base, a switching device layer, and the light-emitting component of claim 1 , wherein the switching device layer is provided for driving the light-emitting component to emit light.

18. A display device, comprising the display substrate of claim 17 .

19. A method for manufacturing a light-emitting component, comprising the following steps:
forming an anode layer on one side of a substrate, the substrate comprising a base and a switching device layer on the base, the anode layer being formed on one side of the switching device layer facing away from the base;
forming a first functional layer group on one side of the anode layer facing away from the substrate;
sequentially forming an organic light-emitting layer, a second functional layer group and a cathode layer on one side of the first functional layer facing away from the substrate;
wherein the first functional layer group comprises a hole injection retarding layer for reducing a hole transport rate; and/or the second functional layer group comprises an electron injection retarding layer for reducing an electron transport rate;
wherein in a direction away from the anode layer, the first functional layer group comprises a hole transport layer and the hole injection retarding layer stacked sequentially; or
the first functional layer group c

Assignees

• Boe Technology Group Co Ltd

Inventors

• Sun Meng
• Xu Shuyun
• Zhou Hui
• Ma Lihui
• Du Xiaobo
• Li Yansong

Classifications

• H10K2101/40

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

• H10K71/00

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

• H10K50/165

  comprising dopants · CPC title

• H10K50/155 Primary

  comprising dopants · CPC title

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title