Anode structure for organic light emitting device

• US 6,853,134 B2
• Filed: 05/20/2003
• Issued: 02/08/2005
• Est. Priority Date: 05/20/2003
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Andresen, Sven, Li, Xiao-Chang Charles, Suzuki, Koichi, Ueno, Kazunori
• Primary Examiner(s): Patel, Vip
• Application Number:
  US10/441,102
• Publication Number:
  US 20040232827A1
• Time in Patent Office: 630 Days
• Field of Search: 313/498, 313/503, 313/506, 313/509
• US Class Current: 313/506
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/816 Multilayers, e.g. transparent multilayers
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• 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

Abstract

An organic light emitting device (OLED) in which an anode includes a gold or gold composition layer under a thin layer of thiol or thiol-derivative. Preferably, the thin layer of thiol or thiol derivative is a self-assembled monolayer so as to enhance interface properties with other layers (such as a hole transporting layer) in the OLED.

Claims

1. An organic light emitting device comprising:

an organic emissive layer between at least a cathode and an anode;

wherein said anode includes a thin metallic layer containing gold under a thin thiol-based layer of a charge transporting functional unit composed of thiol or thiol derivatives.

2. An organic light emitting device according to claim 1, wherein said thin metallic layer comprises gold deposited on a substrate.

3. An organic light emitting device according to claim 2, wherein said substrate comprises ITO-coated glass.

4. An organic light emitting device according to claim 1, wherein said metallic layer comprises gold co-sputtered with ITO on a substrate.

5. An organic light emitting device according to claim 1, wherein said OLED emits light through said anode, and wherein said metallic layer is sufficiently thin so as to be transparent to visible light.

6. An organic light emitting device according to claim 1, wherein said OLED emits light through said cathode, said cathode is transparent, and said metallic layer is sufficiently thick to provide a reflective back surface.

7. An organic light emitting device according to claim 1, wherein said thiol-based layer comprises a self-assembling mono-layer coated on said metallic layer.

8. An organic light emitting device according to claim 7, further comprising a hole transporting layer between said thiol-based layer and said emissive layer.

9. An organic light emitting device according to claim 8, wherein said hole transporting layer has a thickness of 0.2 nm to 50 nm.

10. An organic light emitting device according to claim 8, wherein said hole transporting layer comprises a hole transporting moiety which is chemically bonded to said thiol-based layer.

11. An organic light emitting device according to claim 10, wherein said emissive layer comprises an emissive moiety which is chemically bonded to said hole transporting moiety.

12. An organic light emitting device according to claim 8, wherein said thiol-based layer comprises ethane thiol or methylene thiol.