Organic electroluminescent device

• US 8,890,404 B2
• Filed: 12/22/2012
• Issued: 11/18/2014
• Est. Priority Date: 08/09/2002
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tsutsui, Tetsuo
• Primary Examiner(s): Patel, Vip
• Application Number:
  US13/726,020
• Publication Number:
  US 20130134400A1
• Time in Patent Office: 696 Days
• Field of Search: 313/504, 313/506, 313/498, 313/503
• US Class Current: 313/504
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/18 Carrier blocking layers
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 71/841 Applying alternating current [AC] during manufacturing or treatment
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescence device of the present invention adapts a new concept in its configuration to improve its efficiency in addition to obtain a high reliability and good yielding. The organic electroluminescent device having an electroluminescent film containing an organic material capable of causing an electroluminescence and being arranged between a first electrode and a second electrode, includes: a carrier generation layer, which is a floating electrode, is embodied in the electroluminescent film; an insulting film between the first electrode and the electroluminescent film, and an insulating film between the second electrode and the electroluminescent film, wherein the organic electroluminescent device is driven by an alternating current bias.

Claims

1. A light-emitting device comprising:

a first electrode;

a first electroluminescent layer over the first electrode;

a first insulating layer between the first electrode and the first electroluminescent layer;

a second electroluminescent layer over the first electroluminescent layer;

a carrier generation layer between the first electroluminescent layer and the second electroluminescent layer;

a second electrode over the second electroluminescent layer, and

wherein the carrier generation layer comprises aluminum.

2. The light-emitting device according to claim 1,

wherein the carrier generation layer is aluminum.

3. The light-emitting device according to claim 1,

wherein the first electrode comprises indium oxide and tin oxide.

4. The light-emitting device according to claim 1,

wherein the second electrode comprises aluminum.

5. The light-emitting device according to claim 1,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode.

6. The light-emitting device according to claim 1,

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

7. The light-emitting device according to claim 1,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode, and

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

8. The light-emitting device according to claim 1, further comprising:

an AC power supply which is electrically connected to the first electrode and the second electrode.

9. The light-emitting device according to claim 1,

wherein the first electrode is not in contact with the first electroluminescent layer.

10. The light-emitting device according to claim 1, further comprising:

a second insulating layer between the second electrode and the third electroluminescent layer.

11. The light-emitting device according to claim 10,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode.

12. The light-emitting device according to claim 10,

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

13. The light-emitting device according to claim 10,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode, and

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

14. The light-emitting device according to claim 10, further comprising:

an AC power supply which is electrically connected to the first electrode and the second electrode.

15. The light-emitting device according to claim 10,

wherein the first electrode is not in contact with the first electroluminescent layer.

20. The light-emitting device according to claim 1,

wherein each of the first and second carrier generation layers is aluminum.

16. An organic electroluminescent device comprising:

a first electrode;

a second electrode; and

an electroluminescent film containing an organic compound capable of causing an electroluminescence and being between the first electrode and the second electrode,

a first insulting film between the first electrode and the electroluminescent film, the first insulting film preventing a carrier injection from the first electrode to the electroluminescent film; and

a second insulating film between the second electrode and the electroluminescent film, the second insulating film preventing a carrier injection from the second electrode to the electroluminescent film,

wherein a carrier generation layer is embodied in the electroluminescent film, the carrier generation layer being a floating electrode, and

wherein the carrier generation layer comprises aluminum.

17. The organic electroluminescent device according to claim 16, wherein the carrier generation layer is aluminum.

18. The organic electroluminescent device according to claim 16, further comprising:

an AC power supply which is electrically connected to the first electrode and the second electrode.

19. A light-emitting device comprising:

a substrate;

a first electrode over the substrate;

a first electroluminescent layer over the first electrode;

a first insulating layer between the first electrode and the first electroluminescent layer;

a first carrier generation layer over the first electroluminescent layer;

a second electroluminescent layer over the first carrier generation layer;

a second carrier generation layer over the second electroluminescent layer;

a third electroluminescent layer over the second carrier generation layer; and

a second electrode over the third electroluminescent layer,

wherein each of the first and second carrier generation layers comprises aluminum.

21. The light-emitting device according to claim 19,

wherein the substrate is a glass substrate.

22. The light-emitting device according to claim 19,

wherein the first electrode comprises indium oxide and tin oxide.

23. The light-emitting device according to claim 19,

wherein the second electrode comprises aluminum.

24. The light-emitting device according to claim 19,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode.

25. The light-emitting device according to claim 19,

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

26. The light-emitting device according to claim 19,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode, and

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

27. The light-emitting device according to claim 19, further comprising:

an AC power supply which is electrically connected to the first electrode and the second electrode.

28. The light-emitting device according to claim 19,

wherein the first electrode is not in contact with the first electroluminescent layer.

29. The light-emitting device according to claim 19, further comprising:

a second insulating layer between the second electrode and the second electroluminescent layer.

30. The light-emitting device according to claim 29,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode.

31. The light-emitting device according to claim 29,

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

32. The light-emitting device according to claim 29,

wherein the first insulating layer is in contact with an entire upper surface of the first electrode, and

wherein the first insulating layer is in contact with an entire lower surface of the first electroluminescent layer.

33. The light-emitting device according to claim 29, further comprising:

an AC power supply which is electrically connected to the first electrode and the second electrode.

34. The light-emitting device according to claim 29,

wherein the first electrode is not in contact with the first electroluminescent layer.