# US 8,771,030 B2 · Color conversion layer and manufacturing method for same

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- Number: US 8,771,030 B2
- Document ID: US8771030B2
- Status: Granted
- Kind: B2
- Application number: 12/992,078
- Filed: 2009-08-19
- Published: 2012-08-30
- Granted: 2014-07-08
- Earliest claimed: 2009-08-19
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Masaru Nagai
- Inventors: Masaru Nagai
- Web page: https://patentgrep.com/patent/US8771030B2

## CPC

- G02B 5/201: {in the form of arrays}
- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- G02B 2207/113: Fluorescence
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- Y10T 428/31511: Of epoxy ether
- Y10T 428/31855: Of addition polymer from unsaturated monomers
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention provides a method capable of fabricating, by simple manufacturing processes, a color conversion layer which realizes high-efficiency color conversion characteristics without greatly increasing the film thickness of the color conversion layer. Further, this invention provides a color conversion layer manufactured by this method, and an organic EL element which includes this color conversion layer. By means of a method in which a polymer material having a weight-average molecular weight in a specific range is brought into contact with a color conversion material layer, and the polymer material is caused to intrude into the color conversion layer by a diffusion phenomenon, concentration quenching in the color conversion layer can be suppressed, and the fluorescence quantum yield can be increased.

## Claims

### Claim 1

A manufacturing method for a color conversion layer, comprising:
a step (1) of employing a polymer color conversion material, and fabricating a color conversion material layer on a substrate;
a step (2) of employing a diffusion polymer material, and fabricating a diffusion polymer material layer on the color conversion film material layer; and
a step (3) of diffusing the diffusion polymer material from the diffusion polymer material layer into the color conversion material layer, and fabricating a color conversion layer,
wherein the polymer color conversion material has a weight-average molecular weight of 30,000 or higher and 500,000 or lower, and
the diffusion polymer material has a weight-average molecular weight of 500 or higher and 10,000 or lower.

### Claim 2 (depends on 1)

The manufacturing method according to claim 1, characterized in that step (1) is executed by applying the polymer color conversion material.

### Claim 3 (depends on 1)

The manufacturing method according to claim 1, characterized in that step (2) is executed by applying the diffusion polymer material.

### Claim 4 (depends on 1)

The manufacturing method according to claim 1, characterized in that step (3) is promoted by heating.

### Claim 5 (depends on 1)

The manufacturing method according to claim 1, characterized in that the diffusion polymer material is selected from the group consisting of acrylic resins, methacrylic resins, epoxy modified acrylic resins, silicon modified acrylic resins, and acrylic modified melamine resins.

### Claim 6 (depends on 1)

The manufacturing method according to claim 1, characterized in that the diffusion polymer material includes a thermosetting resin.

### Claim 7 (depends on 6)

The manufacturing method according to claim 6, further comprising, following step (3), a step (4) of hardening the diffusion polymer material.

### Claim 8 (depends on 1, 2, 3, 4, 5, 6, 7)

A color conversion layer, manufactured by the method according to any one of claims 1 to 7.

### Claim 9 (depends on 8)

An organic EL element, comprising the color conversion layer according to claim 8, a pair of electrodes, and an organic EL layer.