Organic light - emitting diodes and methods for assembly and enhanced charge injection

• US 20030162053A1
• Filed: 03/15/2002
• Published: 08/28/2003
• Est. Priority Date: 06/25/1996
• Status: Active Grant

• Current Assignee: Northwestern University
• Original Assignee: Northwestern University
• Inventors: Marks, Tobin J., Huang, Qinglan, Cui, Ji, Veinot, Jonathan
• Granted Patent: US 6,939,625 B2
• Time in Patent Office: Days
• US Class Current: 428/690
• 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: H10K 10/701 Organic molecular electronic devices
• CPC Class Codes: H10K 2102/103 comprising indium oxides, e.g. ITO
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 71/191 characterised by provisions for the orientation or alignment of the layer to be deposited
• CPC Class Codes: H10K 85/10 Organic polymers or oligomers
• CPC Class Codes: H10K 85/111 comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
• CPC Class Codes: H10K 85/113 Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
• CPC Class Codes: H10K 85/1135 Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
• CPC Class Codes: H10K 85/115 Polyfluorene; Derivatives thereof
• CPC Class Codes: H10K 85/151 Copolymers
• 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 85/40 Organosilicon compounds, e.g. TIPS pentacene
• 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 85/656 : comprising two or more different heteroatoms per ring H10K85/652 takes precedence
• CPC Class Codes: H10K 85/6565 : Oxadiazole compounds
• CPC Class Codes: H10K 85/701 : Langmuir Blodgett films
• CPC Class Codes: Y10S 428/917 : Electroluminescent
• CPC Class Codes: Y10T 428/31663 : As siloxane, silicone or silane

Abstract

New organic light-emitting diodes and related electroluminescent devices and methods for fabrication, using siloxane self-assembly techniques.

Claims

1. A method of using an amine molecular component to enhance hole injection across the electrode-organic interface of a light emitting diode device, said method comprising:

providing an anode; and

incorporating an electroluminescent medium adjacent said anode, said medium comprising an amine molecular layer, coupled to said anode, said molecular layer having at the least one of an arylamine molecular component and an arylalkylamine molecular component, each said component substituted with at least one silyl group, and on said molecular layer a hole transport layer of molecular components having said amine structure.

2. The method of claim 1 wherein said molecular layer components are selected from the group consisting of alkylsilyl-substituted compounds of FIGS. 2A and 2C.

3. The method of claim 2 wherein said molecular layer components are selected from the group consisting of alkylsilyl-substituted TAA and alkylsilyl-substituted TPD.

4. The method of claim 3 wherein said molecular layer is spin-coated on said anode.

5. The method of claim 3 wherein said anode is immersed in a solution of said molecular layer components.

6. The method of claim 1 wherein a plurality of molecular layers are coupled to said anode.

7. The method of claim 1 wherein said hole transport layer is TPD.

8. The method of claim 7 wherein said hole transport layer is spin-coated on said anode.

9. An electroluminescent device for generating light upon application of an electrical potential across two electrodes, said device comprising:

an anode;

at least one amine molecular layer, coupled to said anode, said molecular layer having at least one of an arylamine molecular component and an arylalkylamine molecular component, each said component substituted with at least one silyl group;

a conductive layer of molecular components having said amine structure; and

a cathode in electrical contact with said anode layer.

10. The device of claim 9 wherein said molecular layer components are selected from the group consisting of alkylsilyl-substituted compounds of FIGS. 2A and 2C.

11. The device of claim 10 wherein said molecular layer components are selected from the group consisting of alkylsilyl-substituted TAA and alkylsilyl-substituted TPD.

12. The device of claim 11 wherein said conductive layer is a hole transport layer of TPD.

13. The device of claim 9 wherein a plurality of molecular layers are coupled to said anode.

14. An electroluminescent device for generating light upon application of an electrical potential across two electrodes, said device comprising:

an anode;

at least one molecular layer, coupled to said anode, of arylamine molecular components substituted with at least two silyl groups;

a hole transport layer of TPD molecular components, said hole transport layer substantially without crystallization upon annealing; and

a cathode in electrical contact with said anode.

15. The device of claim 14 wherein said molecular layer components are selected from the group consisting of alkylsilyl-substituted TAA and alkylsilyl-substituted TPD.

16. The device of claim 14 wherein a plurality of molecular layers are coupled to said anode.

17. The device of claim 14 further including an electron transport layer.

18. An electroluminescent device for generating light upon application of an electrical potential across two electrodes, said device comprising;

an anode;

at least one molecular layer, coupled to said anode, of alkylsilyl-substituted TPD molecular components;

a hole transport layer of TPD molecular components and

a cathode in electrical contact with said anode.

19. The device of claim 18 further including, an electron transport layer.

20. The device of claim 18 wherein a plurality of molecular layers are coupled to said anode.