Organic Electroluminescent Device

• US 20150137100A1
• Filed: 11/17/2014
• Published: 05/21/2015
• 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 9,209,419 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• 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. (canceled)

2. 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; and

a second electrode over the second electroluminescent layer,

wherein a layer comprising lithium is between the carrier generation layer and the first electroluminescent layer.

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

wherein the carrier generation layer is aluminum.

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

wherein the layer further comprises oxygen.

5. The light-emitting device according to claim 2, further comprising:

an light-emitting device AC power supply which is electrically connected to the first electrode and the second electrode.

6. The light-emitting device according to claim 2, further comprising:

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

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

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

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

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

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

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

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

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.

11. 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; and

a second electrode over the second electroluminescent layer,

wherein a layer comprising lithium and fluorine is between the carrier generation layer and the first electroluminescent layer.

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

wherein the carrier generation layer is aluminum.

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

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

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

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

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

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

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

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

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

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

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

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.

19. 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; and

a second electrode over the second electroluminescent layer,

wherein a layer comprising fluorine is between the carrier generation layer and the first electroluminescent layer.

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

wherein the carrier generation layer is aluminum.

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

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

22. 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.

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

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

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.