Organic Electroluminescent Device

• US 20080150420A1
• Filed: 10/30/2007
• Published: 06/26/2008
• 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
• Granted Patent: US 8,154,193 B2
• Time in Patent Office: Days
• 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

1-9. -9. (canceled)

10. 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 provided between the first electrode and the second electrode,

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

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

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

11. An organic electroluminescent device according to claim 10,

wherein the electroluminescent film comprises a layer having bipolar property.

12. An organic electroluminescent device according to claim 10,

wherein the carrier generation layer has an electric conductivity of 10⁻

10 S/m or more

13. An organic electroluminescent device according to claim 10,

wherein a drive frequency of the organic electroluminescent device is in a range of 1 to 100 KHz.

14. 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 provided between the first electrode and the second electrode,

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

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

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

wherein the organic electroluminescent device is configured to be driven by an alternating current bias.

15. An organic electroluminescent device according to claim 14,

wherein the electroluminescent film comprises a layer having bipolar property.

16. An organic electroluminescent device according to claim 14,

wherein the carrier generation layer has an electric conductivity of 10⁻

10 S/m or more.

17. An organic electroluminescent device according to claim 14,

wherein a drive frequency of the organic electroluminescent device is in a range of 1 to 100 KHz.

18. An organic electroluminescent device according to claim 14,

wherein a waveform of the alternating current bias is selected from a sine wave, a square wave, and a triangle wave.

19. 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 provided between the first electrode and the second electrode,

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

wherein a first insulating film is provided between the first electrode and the electroluminescent film, the first insulating film preventing a carrier injection from the first electrode to the electroluminescent film,

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

wherein the carrier generation layer is formed from a single material.

20. An organic electroluminescent device according to claim 19,

wherein the electroluminescent film comprises a layer having bipolar property.

21. An organic electroluminescent device according to claim 19,

wherein the organic electroluminescent device is configured to be driven by an alternating current bias.

22. An organic electroluminescent device according to claim 19,

wherein the carrier generation layer has an electric conductivity of 10⁻

10 S/m or more.

23. 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 provided between the first electrode and the second electrode,

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

wherein a first insulating film is provided between the first electrode and the electroluminescent film, the first insulating film preventing a carrier injection from the first electrode to the electroluminescent film,

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

wherein the carrier generation layer comprises a first electroluminescent layer, a second electroluminescent layer, and an intrinsic semiconductor, and the intrinsic semiconductor is interposed between the first and second electroluminescent layers.

24. An organic electroluminescent device according to claim 23,

wherein the electroluminescent film comprises a layer having bipolar property.

25. An organic electroluminescent device according to claim 23,

wherein the organic electroluminescent device is configured to be driven by an alternating current bias.

26. An organic electroluminescent device according to claim 23,

wherein the carrier generation layer has an electric conductivity of 10⁻

10 S/m or more.

27. 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 provided between the first electrode and the second electrode,

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

wherein a first insulating film is provided between the first electrode and the electroluminescent film, the first insulating film preventing a carrier injection from the first electrode to the electroluminescent film,

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

wherein the carrier generation layer comprises a conductive film, a first electron injection region on the conductive film, a second electron injection region under the conductive film,

wherein the conductive film is in contact with the first and second electron injection regions.

28. An organic electroluminescent device according to claim 27,

wherein the electroluminescent film comprises a layer having bipolar property.

29. An organic electroluminescent device according to claim 27,

wherein the organic electroluminescent device is configured to be driven by an alternating current bias.

30. An organic electroluminescent device according to claim 27,

wherein the carrier generation layer has an electric conductivity of 10⁻

10 S/m or more.

31. An organic electroluminescent device according to claim 27,

wherein a drive frequency of the organic electroluminescent device is in a range of 1 to 100 KHz.

32. An organic electroluminescent device according to claim 27,

wherein a waveform of the alternating current bias is selected from a sine wave, a square wave, and a triangle wave.

33. An organic electroluminescent device according to claim 27,

wherein the first and second electroluminescent layers are cluster-like.

34. An organic electroluminescent device according to claim 27,

wherein parts of top and upper surfaces of the conductive film are in contact with the electroluminescent film.