# US 7,744,948 B2 · Method for manufacturing electroluminescence device

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- Number: US 7,744,948 B2
- Document ID: US7744948B2
- Status: Granted
- Kind: B2
- Application number: 11/492,682
- Filed: 2006-07-25
- Published: 2007-02-01
- Granted: 2010-06-29
- Earliest claimed: 2005-07-26
- Assignees: Seiko Epson Corporation
- Inventors: Naoyuki Toyoda
- Web page: https://patentgrep.com/patent/US7744948B2

## CPC

- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour
- 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

An electroluminescence device includes a tubular first electrode, an electroluminescence layer formed on an inner surface of the first electrode, and a second electrode formed on an inner surface of the electroluminescence layer. A method for manufacturing the electroluminescence device includes: causing the inner surface of the first electrode to be lyophilic with respect to an electroluminescence layer forming liquid; conducting the electroluminescence layer forming liquid into and out of the inside of the first electrode, thereby forming a liquid film of the electroluminescence layer forming liquid on the inner surface of the first electrode, which inner surface is lyophilic with respect to the electroluminescence layer forming liquid; and forming the electroluminescence layer by drying the liquid film of the electroluminescence layer forming liquid formed on the inner surface of the first electrode.

## Claims

### Claim 1

A method for manufacturing an electroluminescence device, the electroluminescence device including an optically transparent straight tubular first electrode having a first end and second end, an electroluminescence layer formed on an inner surface of the first electrode, and a second electrode formed on an inner surface of the electroluminescent layer, wherein the first end and the second end have a circular shape, the method comprising:
causing the inner surface of the first electrode to be lyophilic with respect to an electroluminescence layer forming liquid;
conducting the electroluminescence layer forming liquid into an inside of the first electrode from the first end to bring the electroluminescence layer forming liquid into contact with the inner surface of the first electrode, and then conducting the electroluminescence layer forming liquid out of the inside of the first electrode from the second end, thereby forming a liquid film of the electroluminescence layer forming liquid on the inner surface of the first electrode, which inner surface is lyophilic with respect to the electroluminescence layer forming liquid; and
forming the electroluminescence layer by drying the liquid film of the electroluminescence layer forming liquid formed on the inner surface of the first electrode.

### Claim 2 (depends on 1)

The method according to claim 1, wherein causing the inner surface of the first electrode to be lyophilic with respect to the electroluminescence layer forming liquid includes conducting a lyophilic treatment fluid into and out of the inside of the first electrode, thereby causing a receding contact angle of the electroluminescence layer forming liquid relative to the inner surface of the first electrode to be 45 degrees or less.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the lyophilic treatment fluid is a cleaning liquid for cleaning the inner surface of the first electrode.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the cleaning liquid is at least one selected from ozone water, sulfuric acid in which ozone gas is dissolved, nitric acid in which ozone gas is dissolved, hydrochloric acid in which ozone gas is dissolved, a mixture of sulfuric acid and hydrogen peroxide solution, a mixture of nitric acid and hydrogen peroxide solution, a mixture of hydrochloric acid and hydrogen peroxide solution, concentrated nitric acid, aqueous sodium hydroxide, aqueous potassium hydroxide, ethanol solution of sodium hydroxide, and ethanol solution of potassium hydroxide.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising:
causing an inner surface of an optically transparent tubular member to be lyophilic with respect to a first electrode forming liquid;
conducting the first electrode forming liquid into and out of the inside of the tubular member, thereby forming a liquid film of the first electrode forming liquid on the inner surface of the tubular member, which inner surface is lyophilic with respect to the first electrode forming liquid; and
forming the first electrode by drying the liquid film of the first electrode forming liquid formed on the inner surface of the tubular member.

### Claim 6 (depends on 5)

The method according to claim 5, wherein causing the inner surface of the tubular member to be lyophilic with respect to the first electrode forming liquid includes conducting a lyophilic treatment fluid into and out of the inside of the tubular member, thereby causing a receding contact angle of the first electrode forming liquid relative to the inner surface of the tubular member to be 45 degrees or less.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the lyophilic treatment fluid is a cleaning liquid for cleaning the inner surface of the tubular member.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the cleaning liquid is at least one selected from ozone water, sulfuric acid in which ozone gas is dissolved, nitric acid in which ozone gas is dissolved, hydrochloric acid in which ozone gas is dissolved, a mixture of sulfuric acid and hydrogen peroxide solution, a mixture of nitric acid and hydrogen peroxide solution, a mixture of hydrochloric acid and hydrogen peroxide solution, concentrated nitric acid, aqueous sodium hydroxide, aqueous potassium hydroxide, ethanol solution of sodium hydroxide, and ethanol solution of potassium hydroxide.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the electroluminescence layer includes a hole transport layer formed on the inner surface of the first electrode, and a light emitting layer formed on the inner surface of the hole transport layer, the forming of the electroluminescence layer including:
conducting a hole transport layer forming liquid into and out of the inside of the first electrode, thereby forming a liquid film of the hole transport layer forming liquid on the inner surface of the first electrode, which inner surface is lyophilic with respect to the electroluminescence layer forming liquid;
forming the hole transport layer by drying the liquid film of the hole transport layer forming liquid formed on the inner surface of the first electrode;
conducting a light emitting layer forming liquid into and out of the inside of the obtained hole transport layer, thereby forming a liquid film of the light emitting layer forming liquid on the inner surface of the hole transport layer; and
forming the light emitting layer by drying the liquid film of the light emitting layer forming liquid formed on the inner surface of the hole transport layer.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the electroluminescence layer includes a light emitting layer formed on the inner surface of the first electrode, and a hole transport layer formed on the inner surface of the light emitting layer, the forming of the electroluminescence layer including:
conducting a light emitting layer forming liquid into and out of the inside of the first electrode, thereby forming a liquid film of the light emitting layer forming liquid on the inner surface of the first electrode, which inner surface is lyophilic with respect to the electroluminescence layer forming liquid;
forming the light emitting layer by drying the liquid film of the light emitting layer forming liquid formed on the inner surface of the first electrode;
conducting a hole transport layer forming liquid into and out of the inside of the obtained light emitting layer, thereby forming a liquid film of the hole transport layer forming liquid on the inner surface of the light emitting layer; and
forming the hole transmit layer by drying the liquid film of the hole transport layer forming liquid formed on the inner surface of the light emitting layer.