Stacked organic light emitting devices

• US 5,917,280 A
• Filed: 02/03/1997
• Issued: 06/29/1999
• Est. Priority Date: 02/03/1997
• Status: Expired due to Term

• Current Assignee: The Trustees of Princeton University (Princeton University)
• Original Assignee: The Trustees of Princeton University (Princeton University)
• Inventors: Forrest, Stephen R., Burrows, Paul
• Primary Examiner(s): Patel, Nimeshkumar D.
• Application Number:
  US08/792,046
• Time in Patent Office: 876 Days
• Field of Search: 313/504, 313/506, 313/509, 345/4, 345/79, 345/76, 427/64, 427/66
• US Class Current: 313/506
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths

Abstract

Arrangements for biasing the individual light emitting elements of a stacked organic light emitting device (SOLED). A circuit is provided for independently driving the individual OLEDs in a conventional SOLED having one electrode coupled to ground potential and one further electrode for each of the OLEDs in the stack. Additionally, new SOLED structures are described in which each OLED in the stack is provided with a ground reference. A SOLED combining upright and inverted OLEDs is also described.

Claims

1. A stacked organic light emitting device arranged on a substrate, the device comprising:

a first electrode arranged on the substrate;

a first set of organic layers arranged on the first electrode;

a second electrode arranged on the first set of organic layers;

a second set of organic layers arranged on the second electrode;

a third electrode arranged on the second set of organic layers;

an insulating layer arranged on the third electrode;

a fourth electrode arranged on the insulating layer;

a third set of organic layers arranged on the fourth electrode; and

a fifth electrode arranged on the third set of organic layers.

2. The device of claim 1, wherein each of the first, second and third sets of organic layers includes an electron transporting layer and a hole transporting layer.

3. The device of claim 2, wherein the electron transporting layer includes an electroluminescent layer.

4. The device of claim 2, wherein the electron transporting layer is arranged over the hole transporting layer in each of the first, second and third sets of organic layers.

5. The device of claim 2, wherein the electron transporting layer is arranged over the hole transporting layer in each of the first and third sets of organic layers and wherein the hole transporting layer is arranged over the electron transporting layer in the second set of organic layers.

6. The device of claim 2, wherein the hole transporting layer is arranged over the electron transporting layer in each of the first, second and third sets of organic layers.

7. The device of claim 2, wherein the hole transporting layer is arranged over the electron transporting layer in each of the first and third sets of organic layers and wherein the electron transporting layer is arranged over the hole transporting layer in the second set of organic layers.

8. The device of claim 1, wherein the second and fourth electrodes are coupled to a ground potential.

9. The device of claim 1, wherein the second and fifth electrodes are coupled to a ground potential.

10. The device of claim 1, wherein each of the first, second and third sets of organic layers emits a light of a color selected from the group of colors consisting of blue, green and red.

11. A display incorporating a plurality of light emitting devices in accordance with claim 1.

12. A vehicle incorporating a display including the light emitting device of claim 1.

13. A television incorporating a display including the light emitting device of claim 1.

14. A computer incorporating a display including the light emitting device of claim 1.

15. A printer incorporating the light emitting device of claim 1.

16. A screen incorporating the light emitting device of claim 1.

17. A sign incorporating the light emitting device of claim 1.

18. A telecommunications device incorporating the light emitting device of claim 1.

19. A telephone incorporating the light emitting device of claim 1.

20. The stacked organic light emitting device of claim 1, wherein:

the first electrode is coupled to a first driving voltage;

the second electrode is coupled to a ground reference; and

the third electrode is coupled to a second driving voltage, controllable independently of the first driving voltage.

21. A stacked organic light emitting device arranged on a substrate, the device comprising:

a first electrode arranged on the substrate;

a first set of organic layers arranged on the first electrode;

a second electrode arranged on the first set of organic layers;

a second set of organic layers arranged on the second electrode;

a third electrode arranged on the second set of organic layers;

a third set of organic layers arranged on the third electrode; and

a fourth electrode arranged on the third set of organic layers;

wherein at least one set of organic layers selected from the group consisting of the first set of organic layers, the second set of organic layers, and the third set of organic layers is inverted; and

wherein at least one set of organic layers selected from the group consisting of the first set of organic layers, the second set of organic layers, and the third set of organic layers is not inverted.

22. The device of claim 21, wherein each of the first, second and third sets of organic layers includes an electron transporting layer and a hole transporting layer.

23. The device of claim 22, wherein the electron transporting layer includes an electroluminescent layer.

24. The device of claim 22, wherein the electron transporting layer of the second and third sets of organic layers includes an electroluminescent layer and the first set of organic layers includes an electroluminescent layer arranged between the electron transporting layer and the hole transporting layer of the first set of organic layers.

25. The device of claim 22, wherein the electron transporting layer is arranged over the hole transporting layer in each of the first and third sets of organic layers and wherein the hole transporting layer is arranged over the electron transporting layer in the second set of organic layers.

26. The device of claim 22, wherein the hole transporting layer is arranged over the electron transporting layer in each of the first and third sets of organic layers and wherein the electron transporting layer is arranged over the hole transporting layer in the second set of organic layers.

27. The device of claim 21, wherein the second set of organic layers includes a protection layer arranged adjacent to the third electrode.

28. The device of claim 21, wherein the second electrode is coupled to a ground potential.

29. The device of claim 21, wherein each of the first, second and third sets of organic layers emits a light of a color selected from the group of colors consisting of blue, green and red.

30. The device of claim 21, wherein the first and third electrodes include indium tin oxide and the second and fourth electrodes include a metal.

31. The device of claim 21, further comprising a cap arranged on the fourth electrode.

32. A display incorporating a plurality of light emitting devices in accordance with claim 21.

33. A vehicle incorporating a display including the light emitting device of claim 21.

34. A television incorporating a display including the light emitting device of claim 21.

35. A computer incorporating a display including the light emitting device of claim 21.

36. A printer incorporating the light emitting device of claim 21.

37. A screen incorporating the light emitting device of claim 21.

38. A sign incorporating the light emitting device of claim 21.

39. A telecommunications device incorporating the light emitting device of claim 21.

40. A telephone incorporating the light emitting device of claim 21.

41. A stacked organic light emitting device arranged on a substrate, the device comprising:

a first electrode arranged on the substrate;

a first set of organic layers arranged on the first electrode;

a second electrode arranged on the first set of organic layers;

an insulating layer arranged on the second electrode;

a third electrode arranged on the insulating layer;

a second set of organic layers arranged on the third electrode;

a fourth electrode arranged on the second set of organic layers;

.

a third set of organic layers arranged on the fourth electrode; and

a fifth electrode arranged on the third set of organic layers.

42. The device of claim 41, wherein each of the first, second and third sets of organic layers includes an electron transporting layer and a hole transporting layer.

43. The device of claim 42, wherein the electron transporting layer includes an electroluminescent layer.

44. The device of claim 42, wherein the electron transporting layer is arranged over the hole transporting layer in each of the first, second and third sets of organic layers.

45. The device of claim 42, wherein the electron transporting layer is arranged over the hole transporting layer in each of the first and third sets of organic layers and wherein the hole transporting layer is arranged over the electron transporting layer in the second set of organic layers.

46. The device of claim 42, wherein the hole transporting layer is arranged over the electron transporting layer in each of the first, second and third sets of organic layers.

47. The device of claim 42, wherein the hole transporting layer is arranged over the electron transporting layer in each of the first and third sets of organic layers and wherein the electron transporting layer is arranged over the hole transporting layer in the second set of organic layers.

48. The device of claim 41, wherein the second and fourth electrodes are coupled to a ground potential.

49. The device of claim 41, wherein each of the first, second and third sets of organic layers emits a light of a color selected from the group of colors consisting of blue, green and red.

50. A display incorporating a plurality of light emitting devices in accordance with claim 41.

51. A vehicle incorporating a display including the light emitting device of claim 41.

52. A television incorporating a display including the light emitting device of claim 41.

53. A computer incorporating a display including the light emitting device of claim 41.

54. A printer incorporating the light emitting device of claim 41.

55. A screen incorporating the light emitting device of claim 41.

56. A sign incorporating the light emitting device of claim 41.

57. A telecommunications device incorporating the light emitting device of claim 41.

58. A telephone incorporating the light emitting device of claim 41.

59. The stacked organic light emitting device of claim 41, wherein:

the third electrode is coupled to a first driving voltage;

the fourth electrode is coupled to a ground reference; and

the fifth electrode is coupled to a second driving voltage, controllable independently of the first driving voltage.

60. A method for producing a stacked organic light emitting device on a substrate, comprising the steps of:

depositing a first electrode on the substrate;

depositing a first set of organic layers on the first electrode;

depositing a second electrode on the first set of organic layers;

depositing a second set of organic layers on the second electrode;

depositing a third electrode on the second set of organic layers;

depositing an insulating layer on the third electrode;

depositing a fourth electrode on the insulating layer;

depositing a third set of organic layers on the fourth electrode; and

depositing a fifth electrode on the third set of organic layers.

61. The method of claim 60, further comprising the steps of:

coupling the first electrode to a first driving voltage;

coupling the second electrode to a ground reference; and

coupling the third electrode to a second driving voltage, controllable independently of the first driving voltage.

62. A method for producing a stacked organic light emitting device on a substrate, comprising the steps of:

depositing a first electrode on the substrate;

depositing a first set of organic layers on the first electrode;

depositing a second electrode on the first set of organic layers;

depositing a second set of organic layers on the second electrode;

depositing a third electrode on the second set of organic layers;

depositing a third set of organic layers on the third electrode; and

depositing a fourth electrode on the third set of organic layers;

wherein at least one set of organic layers selected from the group consisting of the first set of organic layers, the second set of organic layers, and the third set of organic layers is inverted; and

wherein at least one set of organic layers selected from the group consisting of the first set of organic layers, the second set of organic layers, and the third set of organic layers is not inverted.

63. A method for producing a stacked organic light emitting device on a substrate, comprising the steps of:

depositing a first electrode on the substrate;

depositing a first set of organic layers on the first electrode;

depositing a second electrode on the first set of organic layers;

depositing an insulating layer on the second electrode;

depositing a third electrode on the insulating layer;

depositing a second set of organic layers on the third electrode;

depositing a fourth electrode on the second set of organic layers;

depositing a third set of organic layers on the fourth electrode; and

depositing a fifth electrode on the third set of organic layers.

64. The method of claim 63, further comprising the steps of:

coupling the third electrode to a first driving voltage;

coupling the fourth electrode to a ground reference; and

coupling the fifth electrode to a second driving voltage, controllable independently of the first driving voltage.