# US 5,710,484 A · Organic thin film electroluminescent device having a carbon layer between the hole injection layer and the organic thin film layer

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- Number: US 5,710,484 A
- Document ID: US5710484A
- Status: Granted
- Kind: A
- Application number: 08/501,579
- Filed: 1995-07-12
- Granted: 1998-01-20
- Earliest claimed: 1994-07-13
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Hideaki Iwanaga; Akira Gyoutoku; Shintarou Hara
- Web page: https://patentgrep.com/patent/US5710484A

## CPC

- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H05B 33/26: characterised by the composition or arrangement of the conductive material used as an electrode
- H10K 50/17: Carrier injection layers
- Y10S 428/917: Electroluminescent
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The object of the present invention is to provide an organic thin film EL device that has an improved close adherence of a hole injection electrode to an organic thin film layer and a long life, maintaining uniform luminance and minimized performance deterioration over the lapse of time. The organic thin film EL device, which includes an electron injection electrode and an hole injection electrode with an organic thin film layer placed therebetween, has a part or the whole of the hole injection electrode formed of a carbon film. In addition, the carbon film is formed by a sputtering method.

## Claims

### Claim 1

An organic thin film EL (electroluminescent) device comprising:
an organic thin film layer that emits light upon an application of an electric field thereto;
an electron injection electrode disposed on one surface of said organic thin film layer; and
a hole injection electrode disposed on another surface of said organic thin film layer, said hole injection electrode including a transparent electrode layer and a carbon thin film.

### Claim 2

An organic thin film EL device comprising:
an organic thin film layer that emits light upon an application of an electric field thereto;
an electron injection electrode disposed on one surface of said organic thin film layer; and
a hole injection electrode disposed on another surface of said organic thin film layer, entire of said hole injection electrode being formed of a carbon thin film.

### Claim 3

An organic thin film EL (electroluminescent device comprising:
an organic thin film layer that emits light upon an application of an electric field thereto;
an electron injection electrode disposed on one surface of said organic thin film layer; and
a hole injection electrode disposed on another surface of said organic thin film layer, said hole injection electrode including a carbon thin film, wherein the thickness of said carbon thin film ranges from 50 to 1,000 angstrom.

### Claim 4

An organic thin film EL (electroluminescent) device comprising:
an organic thin film layer that emits light upon an application of an electric field thereto;
an electron injection electrode disposed on one surface of said organic thin film layer;
a carbon thin film disposed on another surface of said organic thin film layer; and
a hole injection electrode formed on the other side of said carbon thin film.

### Claim 5

An organic thin film EL (electroluminescent) device comprising:
an organic thin film layer that emits light upon an application of an electric field thereto;
an electron injection electrode disposed on one surface of said organic thin film layer;
a carbon thin film disposed on another surface of said organic thin film layer; and
a hole injection electrode formed on said carbon thin film, wherein said organic thin film layer and said hole injection electrode are joined with said carbon thin film placed therebetween.

### Claim 6

An organic thin film EL (electroluminescent) device comprising:
an organic thin film layer that emits light upon an application of an electric field thereto;
an electron injection electrode disposed on one surface of said organic thin film layer;
a carbon thin film disposed on another surface of said organic thin film layer; and
a hole injection electrode formed on said carbon thin film, wherein the thickness of said carbon thin film ranges from 50 to 1,000 angstroms.

### Claim 7

An organic thin EL (electroluminescent) device comprising:
an organic thin film layer that emits light upon an application of an electric field thereto;
an electron injection layer disposed on one side of said organic thin film layer;
a hole injection layer disposed on another side of said organic thin film layer; and
a carbon thin film layer disposed between said organic thin film layer and said hole injection layer.