Organic electroluminescent device

• US 8,339,036 B2
• Filed: 04/06/2012
• Issued: 12/25/2012
• Est. Priority Date: 08/09/2002
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tsutsui, Tetsuo
• Primary Examiner(s): Patel, Vip
• Application Number:
  US13/441,210
• Publication Number:
  US 20120193616A1
• Time in Patent Office: 263 Days
• Field of Search: 313/498, 313/504, 313/506, 313/509, 313/512
• 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 second electroluminescent layer over the first electroluminescent layer;

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

a second electrode over the second electroluminescent layer,

wherein a first insulating material is provided between the first electrode and the first electroluminescent layer, and

wherein a second insulating material is provided between the second electrode and the second electroluminescent layer.

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

wherein the first insulating material is a first insulating film, and

wherein the second insulating material is a second insulating film.

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

wherein the carrier generation layer is electrically floating.

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

wherein the light-emitting device is configured to be driven by an alternating current bias.

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

wherein at least one of the first insulating material and the second insulating material comprises an inorganic insulator selected from the group consisting of aluminum oxide and calcium fluoride.

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

wherein at least one of the first insulating material and the second insulating material comprises an organic insulator selected from the group consisting of poly-paraxylylene, poly(vinyl phenol) and poly(4-vinyl phenol).

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

wherein an first electroluminescent color emitted from the first electroluminescent layer is different from an second electroluminescent color emitted from the second electroluminescent layer.

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

wherein at least one of the first insulating material and the second insulating material has transparency.

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

wherein a buffer layer is in contact with the carrier generation layer, and

wherein the buffer layer is selected from the group consisting of copper phthalocyanine, LiF and lithium oxide.

10. A lighting according to claim 1.

11. A light-emitting device comprising:

a first electrode;

a first electroluminescent layer over the first electrode;

a second electroluminescent layer over the first electroluminescent layer;

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

a second electrode over the second electroluminescent layer,

wherein a first insulating material is provided between the first electrode and the first electroluminescent layer,

wherein a second insulating material is provided between the second electrode and the second electroluminescent layer, and

wherein the carrier generation layer comprises an organic compound mixture including an electron acceptor and an electron donor.

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

wherein the first insulating material is a first insulating film, and

wherein the second insulating material is a second insulating film.

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

wherein the carrier generation layer is electrically floating.

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

wherein the light-emitting device is configured to be driven by an alternating current bias.

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

wherein at least one of the first insulating material and the second insulating material comprises an inorganic insulator selected from the group consisting of aluminum oxide and calcium fluoride.

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

wherein at least one of the first insulating material and the second insulating material comprises an organic insulator selected from the group consisting of poly-paraxylylene, poly(vinyl phenol) and poly(4-vinyl phenol).

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

wherein an first electroluminescent color emitted from the first electroluminescent layer is different from an second electroluminescent color emitted from the second electroluminescent layer.

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

wherein at least one of the first insulating material and the second insulating material has transparency.

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

wherein a buffer layer is in contact with the carrier generation layer, and

wherein the buffer layer is selected from the group consisting of copper phthalocyanine, LiF and lithium oxide.

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

wherein the electron acceptor includes TCNQ or a nickel complex, and

wherein the electron donor includes TTF.

21. A lighting according to claim 11.

22. A light-emitting device comprising:

a first electrode;

a first electroluminescent layer over the first electrode;

a second electroluminescent layer over the first electroluminescent layer;

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

a second electrode over the second electroluminescent layer,

wherein a first insulating material is provided between the first electrode and the first electroluminescent layer,

wherein a second insulating material is provided between the second electrode and the second electroluminescent layer, and

wherein the carrier generation layer comprises an organic conductive mixture including a p-type semiconductor and an n-type semiconductor.

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

wherein the first insulating material is a first insulating film, and

wherein the second insulating material is a second insulating film.

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

wherein the carrier generation layer is electrically floating.

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

wherein the light-emitting device is configured to be driven by an alternating current bias.

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

wherein at least one of the first insulating material and the second insulating material comprises an inorganic insulator selected from the group consisting of aluminum oxide and calcium fluoride.

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

wherein at least one of the first insulating material and the second insulating material comprises an organic insulator selected from the group consisting of poly-paraxylylene, polyvinyl phenol) and poly(4-vinyl phenol).

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

wherein an first electroluminescent color emitted from the first electroluminescent layer is different from an second electroluminescent color emitted from the second electroluminescent layer.

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

wherein at least one of the first insulating material and the second insulating material has transparency.

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

wherein a buffer layer is in contact with the carrier generation layer, and

wherein the buffer layer is selected from the group consisting of copper phthalocyanine, LiF and lithium oxide.

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

wherein the p-type semiconductor includes a phthalocyanine based compound,

wherein the n-type semiconductor includes F16-copper phthalocyanine, PV, Me-PTC or PTCAD.

32. A lighting according to claim 22.