Organic light-emitting device and display device

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 an electron transport layer, wherein the hole transport layer is arranged between the anode and the organic light-emitting layer, and the electron transport layer is arranged between the cathode and the organic light-emitting layer.

19. The organic light-emitting device according to claim 18 , wherein a highest occupied molecular orbital energy level of the hole transport layer has a range of 4.8-6.2 eV.

20. The organic light-emitting device according to claim 19 , wherein a lowest unoccupied molecular orbital energy level of the electron transport layer has a range of 2.3-3.8 eV.

21. The organic light-emitting device according to claim 1 , wherein the organic light-emitting device is of a top emission type or a bottom emission type.

22. The organic light-emitting device according to claim 1 , wherein the anode comprises a transparent conducting material with a thickness of between 10-100 nm; and the cathode comprises a metal conducting material with a thickness of between 10-50 nm.

23. The organic light-emitting device according to claim 22 , wherein the anode further comprises a light-tight metal conducting material.

24. A display device, comprising an organic light-emitting device, the 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 of 60-80%; and

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,

wherein the blue thermally-activated delayed fluorescent material comprises at least one of

25. The organic light-emitting device according to claim 8 , wherein the blue thermally-activated delayed fluorescent material comprises one or more of:

acridine, triazine, quinazoline, carbazole and derivatives, dibenzofuran, dibenzothiophene, benzene, biphenyl, naphthalene, and anthracene.

26. The organic light-emitting device according to claim 8 , wherein the blue thermally-activated delayed fluorescent material comprises a structure of:

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

27. The organic light-emitting device according to claim 26 , wherein a difference between a singlet energy level and a triplet energy level of the blue thermally-activated delayed fluorescent material is less than or equal to 0.15 eV.

28. The organic light-emitting device according to claim 27 , wherein a photoluminescence spectrum wavelength of the blue thermally-activated delayed fluorescent material is between 450-470 nm.