Organic light-emitting device and display device

Patent metadata

Field	Value
Publication number	US-11056662-B2
Application number	US-201715791347-A
Country	US
Kind code	B2
Filing date	Oct 23, 2017
Priority date	Jun 13, 2017
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

The present application discloses an organic light-emitting device and a display device. The organic light-emitting device comprises an anode, a cathode, and a blue light emitting layer, a green light emitting layer and a red light emitting layer between the anode and the cathode, and the blue light emitting layer comprises a blue thermally-activated delayed fluorescent material with a mass percent of 60-80%, the green light emitting layer comprises a green phosphorescent material and/or a green thermally-activated delayed fluorescent material, and the red light emitting layer comprises a red phosphorescent material and/or a red thermally-activated delayed fluorescent material.

First claim

What is claimed is:

1. An organic light-emitting device, comprising:
an anode, a cathode, and an organic light-emitting layer between the anode and the cathode, wherein the organic light-emitting layer comprises a blue light emitting layer, a green light emitting layer and a red light emitting layer, and the blue light emitting layer is arranged between the cathode and the green light emitting layer, and the green light emitting layer is arranged between the blue light emitting layer and the red light emitting layer;
the blue light emitting layer comprises a blue thermally-activated delayed fluorescent material with a mass percent between 60-80%; and
the green light emitting layer comprises at least one of a green phosphorescent material and a green thermally-activated delayed fluorescent material, and the red light emitting layer comprises at least one of a red phosphorescent material and a red thermally-activated delayed fluorescent material,
wherein the blue thermally-activated delayed fluorescent material comprises at least one of

2. The organic light-emitting device according to claim 1 , wherein a charge generation layer is arranged between the blue light emitting layer and the green light emitting layer, and/or between the green light emitting layer and the red light emitting layer.

3. The organic light-emitting device according to claim 1 , wherein when the green light emitting layer comprises a green thermally-activated delayed fluorescent material and/or when the red light emitting layer comprises a red thermally-activated delayed fluorescent material, the green thermally-activated delayed fluorescent material and/or the red thermally-activated delayed fluorescent material comprises one or more of:
acridine, triazine, quinazoline, carbazole and derivatives, dibenzofuran, dibenzothiophene, benzene, biphenyl, naphthalene, and anthracene.

4. The organic light-emitting device according to claim 1 , wherein when the green light emitting layer comprises a green thermally-activated delayed fluorescent material, the green thermally-activated delayed fluorescent material comprises a structure of:

where X is C, O, S, N or Si; and/or
when the red light emitting layer comprises a red thermally-activated delayed fluorescent material, the red thermally-activated delayed fluorescent material comprises a structure of:

where X is C, O, S, N or Si.

5. The organic light-emitting device according to claim 4 , wherein a difference between a singlet energy level and a triplet energy level of the green thermally-activated delayed fluorescent material and/or the red thermally-activated delayed fluorescent material is less than or equal to 0.15 eV.

6. The organic light-emitting device according to claim 5 , wherein when the green light emitting layer comprises a green thermally-activated delayed fluorescent material, a photoluminescence spectrum wavelength of the green thermally-activated delayed fluorescent material is between 525-540 nm.

7. The organic light-emitting device according to claim 5 , wherein when the red light emitting layer comprises a red thermally-activated delayed fluorescent material, a photoluminescence spectrum wavelength of the red thermally-activated delayed fluorescent material is between 610-620 nm.

8. An organic light-emitting device, comprising:
an anode, a cathode, and an organic light-emitting layer between the anode and the cathode, wherein the organic light-emitting layer comprises a blue light emitting layer, a green light emitting layer and a red light emitting layer, and the blue light emitting layer is arranged between the cathode and the green light emitting layer, and the green light emitting layer is arranged between the blue light emitting layer and the red light emitting layer;
the blue light emitting layer comprises a blue thermally-activated delayed fluorescent material with a mass percent between 60-80%; and
the green light emitting layer comprises at least one of a green phosphorescent material and a green thermally-activated delayed fluorescent material, and the red light emitting layer comprises at least one of a red phosphorescent material and a red thermally-activated delayed fluorescent material,
wherein the green thermally-activated delayed fluorescent material comprises at least one of

9. The organic light-emitting device according to claim 7 , wherein the red thermally-activated delayed fluorescent material comprises:

10. The organic light-emitting device according to claim 1 , wherein when the green light emitting layer comprises a green phosphorescent material, the green phosphorescent material has a lowest unoccupied molecular orbital energy level of 1.7-2.2 eV and a photoluminescence spectrum wavelength of the green phosphorescent material is between 515-545 nm.

11. The organic light-emitting device according to claim 10 , wherein the green phosphorescent material comprises at least one of:

12. The organic light-emitting device according to claim 1 , wherein when the red light emitting layer comprises a red phosphorescent material, the red phosphorescent material has a lowest unoccupied molecular orbital energy level of 2.0-2.4 eV and a photoluminescence spectrum wavelength of the red phosphorescent material is between 600-700 nm.

13. The organic light-emitting device according to claim 12 , wherein the red phosphorescent material comprises:

14. The organic light-emitting device according to claim 1 , wherein the blue thermally-activated delayed fluorescent material is doped with a dopant material with a lowest unoccupied molecular orbital energy level of 2.0-2.4 eV; and
a highest occupied molecular orbital energy level of the dopant material is lower than a highest occupied molecular orbital energy level of the blue thermally-activated delayed fluorescent material, and a lowest unoccupied molecular orbital energy level of the dopant material is higher than a lowest unoccupied molecular orbital energy level of the blue thermally-activated delayed fluorescent material.

15. The organic light-emitting device according to claim 2 , wherein the charge generation layer is doped with a p-type material on a side adjacent to the cathode and/or doped with an n-type material on a side adjacent to the anode, with a doping concentration of 0.5-10%, and a thickness of the charge generation layer is between 50-500 nm.

16. The organic light-emitting device according to claim 15 , wherein the p-type material comprises at least one of:

17. The organic light-emitting device according to claim 15 , wherein the n-type material comprises at least one of Yb, Mg, Al, Ca and compounds thereof.

18. The organic light-emitting device according to claim 1 , further comprising a hole transport layer and a

Assignees

• Shanghai Tianma Am Oled Co Ltd

Inventors

• Zhang Angran
• Yuji Hamada
• Niu Jinghua
• Wang Xiangcheng
• Cheng Shuang
• Yang Run

Classifications

• H10K59/875

  Arrangements for extracting light from the devices · CPC title

• H10K2101/20

  Delayed fluorescence emission · CPC title

• H10K50/12

  comprising dopants · CPC title

• H10K50/13 Primary

  comprising stacked EL layers within one EL unit · CPC title

• G09G3/12

  using electroluminescent elements · CPC title