Organic semiconductor element

• US 8,941,096 B2
• Filed: 06/01/2011
• Issued: 01/27/2015
• Est. Priority Date: 12/05/2001
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tsutsui, Tetsuo, Yamazaki, Hiroko, Seo, Satoshi
• Primary Examiner(s): Tran, Tan N
• Assistant Examiner(s): Wilson, Scott R
• Application Number:
  US13/150,598
• Publication Number:
  US 20110227125A1
• Time in Patent Office: 1,336 Days
• Field of Search: None
• US Class Current: 257/40
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: H10K 10/701 Organic molecular electronic devices
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 30/20 comprising organic-organic junctions, e.g. donor-acceptor junctions
• CPC Class Codes: H10K 30/211 comprising multiple junctions, e.g. double heterojunctions
• CPC Class Codes: H10K 30/57 comprising multiple junctions, e.g. tandem PV cells
• CPC Class Codes: H10K 39/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic radiation-sensitive element covered by group H10K30/00
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/165 comprising dopants
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 85/30 Coordination compounds
• CPC Class Codes: H10K 85/311 Phthalocyanine
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/60 Organic compounds having low molecular weight H10K85/10 - H10K85/50 take precedence
• CPC Class Codes: H10K 85/611 Charge transfer complexes
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/621 : Aromatic anhydride or imide compounds, e.g. perylene tetra-carboxylic dianhydride or perylene tetracarboxylic di-imide
• CPC Class Codes: H10K 85/631 : Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/649 : Aromatic compounds comprising a hetero atom
• CPC Class Codes: H10K 85/6565 : Oxadiazole compounds
• CPC Class Codes: Y02E 10/50 : Photovoltaic [PV] energy
• CPC Class Codes: Y02E 10/549 : Organic PV cells
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

By introducing new concepts into a structure of a conventional organic semiconductor element and without using a conventional ultra thin film, an organic semiconductor element is provided which is more reliable and has higher yield. Further, efficiency is improved particularly in a photoelectronic device using an organic semiconductor. Between an anode and a cathode, there is provided an organic structure including alternately laminated organic thin film layer (functional organic thin film layer) realizing various functions by making an SCLC flow, and a conductive thin film layer (ohmic conductive thin film layer) imbued with a dark conductivity by doping it with an acceptor and a donor, or by the like method.

Claims

1. A light emitting device comprising:

an anode;

a cathode comprising Ag and Mg;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other;

a first layer; and

a second layer,

wherein each of the first electroluminescent layer and the second electroluminescent layer comprises a light emitting layer comprising an organic material,

wherein the cathode is capable of transmitting light from the first electroluminescent layer and the second electroluminescent layer,

wherein the first layer is between the first electroluminescent layer and the second electroluminescent layer, and the first layer comprises an organic compound and an acceptor,

wherein the second layer is between the first electroluminescent layer and the first layer, and the second layer comprises an n-type semiconductor, and

wherein the first layer has a conductivity of 10<sup>−

10</sup> S/m or greater.

2. The light emitting device according to claim 1 wherein the organic compound is doped with the acceptor.

3. The light emitting device according to claim 1 wherein the second layer comprises an organic compound and a donor.

4. A light emitting device comprising:

an anode;

a cathode;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other;

a first layer; and

a second layer,

wherein each of the first electroluminescent layer and the second electroluminescent layer comprises a light emitting layer comprising an organic material,

wherein at least one of the first electroluminescent layer and the second electroluminescent layer emits light from a triplet excited state,

wherein the first layer is between the first electroluminescent layer and the second electroluminescent layer, and the first layer comprises an organic compound and an acceptor, and

wherein the second layer is between the first electroluminescent layer and the first layer, and the second layer comprises an n-type semiconductor.

5. The light emitting device according to claim 4 wherein the organic compound is doped with the acceptor.

6. The light emitting device according to claim 4 wherein the second layer comprises an organic compound and a donor.

7. The light emitting device according to claim 4 wherein the cathode comprises a metal alloy, and the cathode is enough thin to let light from the first electroluminescent layer and from the second electroluminescent layer out through the cathode.

8. A light emitting device comprising:

an anode;

a cathode;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other; and

a layer between the first electroluminescent layer and the second electroluminescent layer, the layer comprising an organic compound doped with an acceptor,

wherein each of the first electroluminescent layer and the second electroluminescent layer comprises a light emitting layer comprising an organic material, and

wherein at least one of the first electroluminescent layer and the second electroluminescent layer comprises a bipolar organic compound.

9. The light emitting device according to claim 8 wherein the layer has a conductivity of 10⁻

10 S/m or greater.

10. The light emitting device according to claim 8, further comprising a second layer between the layer and the first electroluminescent layer, wherein the second layer comprises an organic compound and a donor.

11. The light emitting device according to claim 8 wherein the cathode comprises a metal alloy, and the cathode is enough thin to let light from the first electroluminescent layer and from the second electroluminescent layer out through the cathode.

12. A light emitting device comprising:

an anode;

a cathode;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other; and

a layer between the first electroluminescent layer and the second electroluminescent layer, the layer comprising an organic compound doped with an acceptor,

wherein each of the first electroluminescent layer and the second electroluminescent layer comprises a light emitting layer comprising an organic material, and

wherein at least one of the first electroluminescent layer and the second electroluminescent layer comprises a polymer.

13. The light emitting device according to claim 12 wherein the layer has a conductivity of 10⁻

10 S/m or greater.

14. The light emitting device according to claim 12, further comprising a second layer between the layer and the first electroluminescent layer, wherein the second layer comprises an organic compound and a donor.

15. The light emitting device according to claim 12 wherein the cathode comprises a metal alloy, and the cathode is enough thin to let light from the first electroluminescent layer and from the second electroluminescent layer out through the cathode.

16. A light emitting device comprising:

an anode over a substrate;

a cathode over the anode, the cathode comprising Ag and Mg;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other; and

a layer between the first electroluminescent layer and the second electroluminescent layer, the layer comprising an organic compound doped with an acceptor,

wherein the cathode is capable of transmitting light from the first electroluminescent layer and the second electroluminescent layer, and

wherein the layer has a conductivity of 10<sup>−

10</sup> S/m or greater.

17. The light emitting device according to claim 16, further comprising a second layer between the layer and the first electroluminescent layer, wherein the second layer comprises an organic compound and a donor.

18. A light emitting device comprising:

an anode over a substrate;

a cathode over the anode;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other; and

a layer between the first electroluminescent layer and the second electroluminescent layer, the layer comprising an organic compound doped with an acceptor,

wherein at least one of the first electroluminescent layer and the second electroluminescent layer emits light from a triplet excited state.

19. The light emitting device according to claim 18, further comprising a second layer between the layer and the first electroluminescent layer, wherein the second layer comprises an organic compound and a donor.

20. The light emitting device according to claim 18 wherein the cathode comprises a metal alloy, and the cathode is enough thin to let light from the first electroluminescent layer and from the second electroluminescent layer out through the cathode.

21. A light emitting device comprising:

an anode over a substrate;

a cathode over the anode;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other; and

a layer between the first electroluminescent layer and the second electroluminescent layer, the layer comprising an organic compound doped with an acceptor,

wherein at least one of the first electroluminescent layer and the second electroluminescent layer comprises a bipolar organic compound.

22. The light emitting device according to claim 21 wherein the layer has a conductivity of 10⁻

10 S/m or greater.

23. The light emitting device according to claim 21, further comprising a second layer between the layer and the first electroluminescent layer, wherein the second layer comprises an organic compound and a donor.

24. The light emitting device according to claim 21 wherein the cathode comprises a metal alloy, and the cathode is enough thin to let light from the first electroluminescent layer and from the second electroluminescent layer out through the cathode.

25. A light emitting device comprising:

an anode over a substrate;

a cathode over the anode;

a first electroluminescent layer between the anode and the cathode;

a second electroluminescent layer between the first electroluminescent layer and the cathode, wherein the first electroluminescent layer and the second electroluminescent layer are overlapped with each other; and

a layer between the first electroluminescent layer and the second electroluminescent layer, the layer comprising an organic compound doped with an acceptor,

wherein each of the first electroluminescent layer and the second electroluminescent layer comprises a light emitting layer comprising an organic material, and

wherein at least one of the first electroluminescent layer and the second electroluminescent layer comprises a polymer.

26. The light emitting device according to claim 25 wherein the layer has a conductivity of 10⁻

10 S/m or greater.

27. The light emitting device according to claim 25, further comprising a second layer between the layer and the first electroluminescent layer, wherein the second layer comprises an organic compound and a donor.

28. The light emitting device according to claim 25 wherein the cathode comprises a metal alloy, and the cathode is enough thin to let light from the first electroluminescent layer and from the second electroluminescent layer out through the cathode.