# US 9,040,977 B2 · Organic EL element having at least one organic light-emitting layers formed of a mixture containing a polymer material and method for manufacturing the organic EL element

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,040,977 B2
- Document ID: US9040977B2
- Status: Granted
- Kind: B2
- Application number: 14/347,360
- Filed: 2012-09-14
- Published: 2014-08-21
- Granted: 2015-05-26
- Earliest claimed: 2011-09-28
- Assignees: Toppan Printing Co., Ltd.
- Applicants: Yasutake Akeno; Takuma Oouchi
- Inventors: Yasutake Akeno; Takuma Oouchi
- Web page: https://patentgrep.com/patent/US9040977B2

## CPC

- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 71/13: using printing techniques, e.g. ink-jet printing or screen printing
- H10K 2101/10: Triplet emission
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

To form stabilized organic light-emitting medium layers using the relief printing method and to provide an organic EL element excellent in terms of pattern-forming accuracy, film thickness uniformity and light-emitting characteristics, a substrate 2, first electrode layers 3 provided on the substrate 2, organic light-emitting medium layers 5 which are provided on the first electrode layers 3 and emit light when electrically connected, and second electrodes 6 which are provided on the organic light-emitting medium layers 5 and make the organic light-emitting medium layers 5 electrically connected when voltage is applied between the first electrodes 3 and the second electrodes are provided. In addition, at least one of the organic light-emitting medium layers 5 is formed of a mixture containing a polymer material having a weight-average molecular weight in a range of 1.5 million to 25 million and at least one low molecular material having a non-repetitive structure. Also, the mixing ratio between the polymer material and the low molecular material is set in a range of 0.05:1 to 0.5:1 in terms of weight ratio.

## Claims

### Claim 1

An organic EL element comprising:
a substrate;
first electrode layers provided on the substrate;
organic light-emitting medium layers provided on the first electrode layers and emitting light when electrically connected; and
second electrodes provided on the organic light-emitting medium layers to make the organic light-emitting medium layers electrically connected when voltage is applied between the first electrodes and the second electrodes,
wherein at least one of the organic light-emitting medium layers is formed of a mixture containing a non-conductive polymer material having a weight-average molecular weight in a range of 1.5 million to 25 million and at least one low molecular material having a non-repetitive structure and having a weight-average molecular weight in a range of 100 to 3000.

### Claim 2 (depends on 1)

The organic EL element according to claim 1, wherein the low molecular material is made of an organic light-emitting material.

### Claim 3 (depends on 1)

The organic EL element according to claim 1, wherein a mixing ratio between the polymer material and the low molecular material is set in a range of 0.05:1 to 0.5:1 in terms of weight ratio.

### Claim 4

A method for manufacturing an organic EL element comprising:
providing first electrode layers on a substrate;
providing organic light-emitting medium layers emitting light when electrically connected on the first electrode layers;
providing second electrodes on the organic light-emitting medium layers to make the organic light-emitting medium layers electrically connected when voltage is applied between the first electrodes and the second electrodes; and
forming at least one of the organic light-emitting medium layers by applying ink containing a non-conductive polymer material having a weight-average molecular weight in a range of 1.5 million to 25 million and at least one low molecular material having a non-repetitive structure and having a weight-average molecular weight in a range of 100 to 3000.

### Claim 5 (depends on 4)

The method for manufacturing an organic EL element according to claim 4, wherein an organic light-emitting material is used for the low molecular material.

### Claim 6 (depends on 4)

The method for manufacturing an organic EL element according to claim 4, wherein a concentration of the polymer material in the ink is set in a range of 0.05% by weight to 10% by weight.

### Claim 7 (depends on 4)

The method for manufacturing an organic EL element according to claim 4, wherein the ink is applied using a relief printing method.