IP Library › Granted Patent US 7,173,370

Granted Patent B2

US 7,173,370 · App. 10/060,427 · Granted Feb 6, 2007

Organic light emitting element and display device using the element

Assignee: Semiconductor Energy Laboratory Co., Ltd.

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Quick Facts

Patent No.: US 7,173,370
App. No.: 10/060,427
Granted: Feb 6, 2007
Kind: B2

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Abstract

A hole transporting region made of a hole transporting material, an electron transporting region made of an electron transporting material, and a mixed region (light emitting region) in which both the hole transporting material and the electron transporting material are mixed and which is doped with a triplet light emitting material for red color are provided in an organic compound film, whereby interfaces between respective layers which exist in a conventional lamination structure are eliminated, and respective functions of hole transportation, electron transportation, and light emission are exhibited. In accordance with the above-mentioned method, the organic light emitting element for red color can be obtained in which power consumption is low and a life thereof is long. Thus, the display device and the electric device are manufactured by using the organic light emitting element.

Claims (114)

1. An organic light emitting element comprising:

an anode;

a cathode; and

an organic compound film provided between the anode and the cathode,

wherein the organic compound film comprises a hole transporting region comprising a hole transporting material and an electron transporting region comprising an electron transporting material;

wherein a mixed region having a first portion and a second portion and comprising both the hole transporting material and the electron transporting material is provided between the hole transporting region and the electron transporting region;

wherein a material for exhibiting red color light emission from a triplet excitation state is added to the first portion of the mixed region, the first portion being apart from at least one of the hole transporting region and the electron transporting region;

wherein the material for exhibiting red color light emission from a triplet excitation state is not added to the second portion of the mixed region; and

wherein one of the hole transporting material and the electron transporting material in the mixed region is a host material for the material for exhibiting red color light emission from a triplet excitation state.

2. The organic light emitting element according to claim 1 , wherein a blocking material with larger energy difference between a highest occupied molecular orbital and a lowest unoccupied molecular orbital than the hole transporting material and the electron transporting material is added to the second portion of the mixed region, the second portion being close to at least one of the hole transporting region and the electron transporting region; and

wherein the first portion is closer to the anode side than the second portion.

3. The organic light emitting element according to claim 1 , wherein the mixed region has a thickness in a range of 10 nm to 100 nm.

4. The organic light emitting element according to claim 1 , wherein the hole transporting material is one of aromatic amine-based compounds.

5. The organic light emitting element according to claim 1 , wherein the electron transporting material is one of metal complexes.

6. An organic light emitting element comprising:

an anode;

a cathode; and

an organic compound film provided between the anode and the cathode,

wherein the organic compound film comprises a hole transporting region comprising a hole transporting material and an electron transporting region comprising an electron transporting material;

wherein a blocking material with larger energy difference between a highest occupied molecular orbital and a lowest unoccupied molecular orbital than the hole transporting material and the electron transporting material is added to the second portion of the mixed region, the second portion being close to at least one of the hole transporting region and the electron transporting region;

wherein the material for exhibiting red color light emission from a triplet excitation state is not added to the second portion; and

7. The organic light emitting element according to claim 6 , wherein the mixed region has a thickness in a range of 10 nm to 100 nm.

8. The organic light emitting element according to claim 6 , wherein the hole transporting material is one of aromatic amine-based compounds.

9. The organic light emitting element according to claim 6 , wherein the electron transporting material is one of metal complexes.

10. An organic light emitting element comprising:

an anode;

a cathode; and

an organic compound film provided between the anode and the cathode,

wherein the organic compound film comprises a hole transporting region comprising a hole transporting material and an electron transporting region comprising an electron transporting material;

wherein a mixed region comprising both the hole transporting material and the electron transporting material is provided between the hole transporting region and the electron transporting region;

wherein a material for exhibiting red color light emission from a triplet excitation state is added to only a portion of the mixed region, the portion being apart from at least one of the hole transporting region and the electron transporting region;

wherein a concentration of the hole transporting material in the mixed region decreases while a concentration of the electron transporting material in the mixed region increases in the direction from the anode toward the cathode; and

11. The organic light emitting element according to claim 10 , wherein the mixed region has a thickness in a range of 10 nm to 100 nm.

12. The organic light emitting element according to claim 10 , wherein the hole transporting material is one of aromatic amine-based compounds.

13. The organic light emitting element according to claim 10 , wherein the electron transporting material is one of metal complexes.

14. A full color display device comprising:

an organic light emitting element for red color light emission;

an organic light emitting element for green color light emission; and

an organic light emitting element for blue color light emission,

wherein the organic light emitting element for red color light emission comprises:

a first anode;

a first cathode; and

a first organic compound film provided between the first anode and the first cathode,

wherein the first organic compound film comprises a first hole transporting region comprising a first hole transporting material and a first electron transporting region comprising a first electron transporting material;

wherein a first mixed region comprising both the first hole transporting material and the first electron transporting material is provided between the first hole transporting region and the first electron transporting region;

wherein a material for exhibiting red color light emission from a triplet excitation state is added to only a portion of the first mixed region, the portion being apart from at least one of the hole transporting region and the electron transporting region; and

wherein one of the hole transporting material and the electron transporting material in the first mixed region is a host material for the material for exhibiting red color light emission from a triplet excitation state.

15. The full color display device according to claim 14 , wherein at least one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission is an organic light emitting element for exhibiting light emission from a singlet excitation state.

16. The full color display device according to claim 14 , wherein at least one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission is an organic light emitting element for exhibiting light emission from a singlet excitation state,

wherein the second organic compound film comprises a second hole transporting region comprising a second hole transporting material and a second electron transporting region comprising a second electron transporting material; and

wherein a second mixed region comprising both the second hole transporting material and the second electron transporting material is provided between the second hole transporting region and the second electron transporting region.

17. The full color display device according to claim 16 , wherein a concentration of the second hole transporting material in the second mixed region decreases while a concentration of the second electron transporting material in the second mixed region increases in the direction from the second anode toward the second cathode.

18. The full color display device according to claim 16 , wherein the second mixed region has a thickness in a range of 10 nm to 100 nm.

19. The full color display device according to claim 16 , wherein a material for exhibiting light emission is added to the second mixed region.

20. The full color display device according to claim 16 , wherein a material for exhibiting light emission is added to a part of the second mixed region.

21. The full color display device according to claim 14 , wherein at least one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission is an organic light emitting element for exhibiting light emission from a singlet excitation state,

wherein the one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission comprises a second anode, a second cathode, a hole injecting region in contact with the second anode, and a second organic compound film provided between the hole injecting region and the second cathode;

22. The full color display device according to claim 21 , wherein a concentration of the second hole transporting material in the second mixed region decreases while a concentration of the second electron transporting material in the second mixed region increases in the direction from the second anode toward the second cathode.

23. The full color display device according to claim 21 , wherein the second mixed region has a thickness in a range of 10 nm to 100 nm.

24. The full color display device according to claim 21 , wherein a material for exhibiting light emission is added to the second mixed region.

25. The full color display device according to claim 21 , wherein a material for exhibiting light emission is added to a part of the second mixed region.

26. The full color display device according to claim 14 , wherein at least one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission is an organic light emitting element for exhibiting light emission from a singlet excitation state,

wherein the one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission comprises a second anode, a second cathode, an electron injecting region in contact with the second cathode, and a second organic compound film provided between the second anode and the electron injecting region;

27. The full color display device according to claim 26 , wherein a concentration of the second hole transporting material in the second mixed region decreases while a concentration of the second electron transporting material in the second mixed region increases in the direction from the second anode toward the second cathode.

28. The full color display device according to claim 26 , wherein the second mixed region has a thickness in a range of 10 nm to 100 nm.

29. The full color display device according to claim 26 , wherein a material for exhibiting light emission is added to the second mixed region.

30. The full color display device according to claim 26 , wherein a material for exhibiting light emission is added to a part of the second mixed region.

31. The full color display device according to claim 14 , wherein at least one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission is an organic light emitting element for exhibiting light emission from a singlet excitation state,

wherein the one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission comprises a second anode, a second cathode, a hole injecting region in contact with the second anode, an electron injecting region in contact with the second cathode, and a second organic compound film provided between the hole injecting region and the electron injecting region;

32. The full color display device according to claim 31 , wherein a concentration of the second hole transporting material in the second mixed region decreases while a Concentration of the second electron transporting material in the second mixed region increases in the direction from the second anode toward the second cathode.

33. The full color display device according to claim 31 , wherein the second mixed region has a thickness in a range of 10 nm to 100 nm.

34. The full color display device according to claim 31 , wherein a material for exhibiting light emission is added to the second mixed region.

35. The full color display device according to claim 31 , wherein a material for exhibiting light emission is added to a part of the second mixed region.

36. The full color display device according to claim 14 , wherein at least one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission is an organic light emitting element for exhibiting light emission from a singlet excitation state,

wherein the one of the organic light emitting element for green color light emission and the organic light emitting element for blue color light emission comprises a second anode, a second cathode, a hole injecting region in contact with the second anode, and an second organic compound film provided between the hole injecting region and the second cathode; and

wherein a second mixed region comprising a material included in the hole injecting region and a material included in the second organic compound film is formed between the hole injecting region and the second organic compound film.

37. The full color display device according to claim 14 , wherein the first mixed region has a thickness in a range of 10 nm to 100 nm.

38. The organic light emitting element according to claim 14 , wherein the hole transporting material is one of aromatic amine-based compounds.

39. The organic light emitting element according to claim 14 , wherein the electron transporting material is one of metal complexes.

40. An organic light emitting element comprising:

an anode;

a cathode; and

an organic compound film provided between the anode and the cathode,

wherein the organic compound film comprises a hole transporting region comprising a hole transporting material and an electron transporting region comprising an electron transporting material,

wherein a mixed region having a first portion and a second portion and comprising both the hole transporting material and the electron transporting material and having a bipolar property is provided between the hole transporting region and the electron transporting region,

wherein the material for exhibiting red color light emission from a triplet excitation state is not added to the second portion.

41. The organic light emitting element according to claim 40 , wherein a blocking material with larger energy difference between a highest occupied molecular orbital and a lowest unoccupied molecular than the hole transporting material and the electron transporting material is added to the second portion of the mixed region, the second portion being close to at least one of the hole transporting region and the electron transporting region; and

wherein a region to which the material for exhibiting red color light emission from a triplet excitation state is added is closer to the anode side than a region to which the blocking material is added.

42. The organic light emitting element according to claim 40 , wherein the mixed region has a thickness in a range of 10 nm to 100 nm.

43. The organic light emitting element according to claim 40 , wherein the hole transporting material is one of aromatic amine-based compounds.

44. The organic light emitting element according to claim 40 , wherein the electron transporting material is one of metal complexes.

45. An organic light emitting element comprising:

an anode;

a cathode; and

an organic compound film provided between the anode and the cathode,

wherein the organic compound film comprises a hole transporting region comprising a hole transporting material and an electron transporting region comprising an electron transporting material,

wherein a mixed region comprising both the hole transporting material and the electron transporting material and having a bipolar property is provided between the hole transporting region and the electron transporting region,

46. The organic light emitting element according to claim 45 , wherein the mixed region has a thickness in a range of 10 nm to 100 nm.

47. The organic light emitting element according to claim 45 , wherein the hole transporting material is one of aromatic amine-based compounds.

48. The organic light emitting element according to claim 45 , wherein the electron transporting material is one of metal complexes.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 29, 2002

From: SEO, SATOSHI; YAMAZAKI, SHUNPEI

To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Reel/Frame 012555/0056 →

Priority Claims (1)

JP 2001-025971 · Feb 1, 2001 · national

Continuity (1)

Related Publication 20020101154A1 · Aug 1, 2002