# US 2018/0026221 A1 · Organic electroluminescence device, organic electroluminescence unit, and electronic apparatus

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- Number: US 2018/0026221 A1
- Document ID: US20180026221A1
- Status: Published application
- Kind: A1
- Application number: 15/608,087
- Filed: 2017-05-30
- Published: 2018-01-25
- Earliest claimed: 2016-07-20
- Assignees: Joled Inc.
- Applicants: Joled Inc.
- Inventors: Kazuhiro YONEDA; Noriyuki MATSUSUE
- Web page: https://patentgrep.com/patent/US20180026221A1

## CPC

- H10K 50/16: Electron transporting layers
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/15: Hole transporting layers
- H10K 2101/30: Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic electroluminescence device includes, in order, a first electrode, a hole transport layer, an organic light-emitting layer, an electron transport layer, and a second electrode. The hole transport layer is configured by a coated film. The organic light-emitting layer is configured by a coated film. The organic light-emitting layer has a hole current that is larger than an electron current.

## Claims

### Claim 1

An organic electroluminescence device comprising, in order:
a first electrode;
a hole transport layer configured by a coated film;
an organic light-emitting layer configured by a coated film, the organic light-emitting layer having a hole current that is larger than an electron current;
an electron transport layer; and
a second electrode.

### Claim 2 (depends on 1)

The organic electroluminescence device according to claim 1, wherein a quotient of the hole current divided by the electron current is larger than 5.

### Claim 3 (depends on 1)

The organic electroluminescence device according to claim 1, wherein the organic light-emitting layer has hole mobility that is larger than electron mobility.

### Claim 4 (depends on 3)

The organic electroluminescence device according to claim 3, wherein a quotient of the hole mobility divided by the electron mobility is larger than 10.

### Claim 5 (depends on 3)

The organic electroluminescence device according to claim 3, wherein a position of a light emission region provided in the organic light-emitting layer comes closer to the electron transport layer, as a quotient of the hole mobility divided by the electron mobility becomes larger.

### Claim 6 (depends on 1)

The organic electroluminescence device according to claim 1, wherein a position of a light emission region provided in the organic light-emitting layer comes closer to the electron transport layer, as a quotient of the hole current divided by the electron current becomes larger.

### Claim 7 (depends on 1)

The organic electroluminescence device according to claim 1, wherein the hole transport layer comprises an insolubilized hole transport layer.

### Claim 8 (depends on 7)

The organic electroluminescence device according to claim 7, wherein the electron transport layer has an energy gap that is larger than an energy gap of the organic light-emitting layer.

### Claim 9 (depends on 8)

The organic electroluminescence device according to claim 8, wherein the electron transport layer comprises a deposited film.

### Claim 10

An organic electroluminescence unit provided with a plurality of organic electroluminescence devices, one or more of the plurality of organic electroluminescence devices comprising, in order:
a first electrode;
a hole transport layer configured by a coated film;
an organic light-emitting layer configured by a coated film, the organic light-emitting layer having a hole current that is larger than an electron current;
an electron transport layer; and
a second electrode.

### Claim 11

An electronic apparatus provided with an organic electroluminescence unit, the organic electroluminescence unit having a plurality of organic electroluminescence devices, one or more of the plurality of organic electroluminescence devices comprising, in order:
a first electrode;
a hole transport layer configured by a coated film;
an organic light-emitting layer configured by a coated film, the organic light-emitting layer having a hole current that is larger than an electron current;
an electron transport layer; and
a second electrode.