# US 8,772,762 B2 · Organic electroluminescent device, method for manufacturing organic electroluminescent device, image display device, and method for manufacturing image display device

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- Number: US 8,772,762 B2
- Document ID: US8772762B2
- Status: Granted
- Kind: B2
- Application number: 13/240,835
- Filed: 2011-09-22
- Published: 2012-01-12
- Granted: 2014-07-08
- Earliest claimed: 2009-03-25
- Assignees: Toppan Printing Co., Ltd.
- Applicants: Shingo Kaneta; Yuki Yasu; Ryo Syoda; Noriko Morikawa; Eiichi Kitazume
- Inventors: Shingo Kaneta; Yuki Yasu; Ryo Syoda; Noriko Morikawa; Eiichi Kitazume
- Web page: https://patentgrep.com/patent/US8772762B2

## CPC

- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 50/15: Hole transporting layers
- H10K 50/17: Carrier injection layers
- H10K 59/8051: {Anodes}
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Provided is an organic electroluminescent device including: a substrate (11, 101); a first electrode (12, 102) formed on the substrate (11, 101) and including a pixel region; a partition wall (23, 203) formed on the substrate (11, 101), partitioning the first electrode (12, 102), and including a surface with a recessed and projected form; a luminescent medium layer (19, 109) formed on the pixel region and the partition wall (23, 203), a film thickness of the partition wall (23, 203) being uneven according to the recessed and projected form; and a second electrode (17, 107) formed on the luminescent medium layer (19, 109).

## Claims

### Claim 1

An organic electroluminescent device comprising:
a substrate;
a first electrode formed on the substrate and comprising a pixel region;
a partition wall formed on the substrate, partitioning the first electrode, and comprising a surface with a recessed and projected surface form;
a luminescent medium layer formed on the pixel region and the partition wall, a film thickness of the partition wall being uneven according to the recessed and projected form, the luminescent medium layer being partially severed according to the recessed and projected form; and
a second electrode formed on the luminescent medium layer, wherein
the recessed and projected surface form is formed over substantially all surface portions of the partition wall at which the partition wall and the luminescent medium layer contact each other,
a calculated average roughness Ra of the recessed and projected surface form is greater than or equal to 1 nm and less than or equal to 200 nm,
an average interval between protected portions of a surface of the recessed and projected surface form is greater than or equal to 5 nm and less than or equal to 100 nm, and
the recessed and projected surface form is configured to increase specific resistance of the luminescent medium layer in a film-surface direction and to restrain a leak current passing through the luminescent medium layer formed on the surface of the partition wall.

### Claim 2 (depends on 1)

The organic electroluminescent device according to claim 1, wherein the luminescent medium layer formed on the partition wall is a hole transport layer.

### Claim 3 (depends on 2)

The organic electroluminescent device according to claim 2, wherein the hole transport layer is an inorganic compound.

### Claim 4 (depends on 3)

The organic electroluminescent device according to claim 3, wherein the inorganic compound comprises one or more types of transition metal.

### Claim 5 (depends on 4)

The organic electroluminescent device according to claim 4, wherein the inorganic compound is an oxide, a nitride, or a sulfide.

### Claim 6 (depends on 3, 4)

The organic electroluminescent device according to claim 3, 4, or 5, wherein a film thickness of the inorganic compound is greater than or equal to 1 nm and less than or equal to 50 nm.

### Claim 7 (depends on 1)

The organic electroluminescent device according to claim 1, wherein the luminescent medium layer formed on the partition wall is a recessed and projected film formed according to the recessed and projected form.