# US 12,114,520 B2 · Organic light emitting device, and display apparatus, photoelectric conversion apparatus, electronic apparatus, illumination apparatus, and moving object including the same

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- Number: US 12,114,520 B2
- Document ID: US12114520B2
- Status: Granted
- Kind: B2
- Application number: 16/862,317
- Filed: 2020-04-29
- Published: 2020-11-12
- Granted: 2024-10-08
- Earliest claimed: 2019-05-07
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Naoki Yamada; Satoru Shiobara; Jun Kamatani
- Web page: https://patentgrep.com/patent/US12114520B2

## CPC

- H10K 50/166: {comprising a multilayered structure}
- H10F 39/8063: {Microlenses}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/16: Electron transporting layers
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons}
- H10K 59/65: OLEDs integrated with inorganic image sensors
- H10K 59/80518: {Reflective anodes, e.g. ITO combined with thick metallic layers}
- H10K 85/615: {Polycyclic condensed aromatic hydrocarbons, e.g. anthracene}
- H10K 85/622: {containing four rings, e.g. pyrene}
- H10K 85/626: {containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene}
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION

## Abstract

An organic light emitting device including, in sequence, an anode, a light emitting layer, a first electron transport layer, a second electron transport layer, and a cathode, wherein the second electron transport layer includes a first material and a second material different from the first material, and the first electron transport layer includes a third material and a fourth material different from the third material.

## Claims

### Claim 1

An organic light emitting device comprising, in sequence, an anode, a light emitting layer, a first electron transport layer, a second electron transport layer, and a cathode,
wherein the second electron transport layer includes a first material and a second material different from the first material, and the first electron transport layer includes a third material and a fourth material different from the third material,
wherein the first material, the second material, the third material, and the fourth material satisfy the following conditions (a) and (b):
(a) |HOMO (first material)|>|HOMO (second material)|>|HOMO (fourth material)|
(b) |HOMO (first material)|>|HOMO (third material)|>|HOMO (fourth material)|
where HOMO (first material), HOMO (second material), HOMO (third material), and HOMO (fourth material) represent a value of highest occupied molecular orbital (HOMO) energy of the first material, a value of HOMO energy of the second material, a value of HOMO energy of the third material, and a value of HOMO energy of the fourth material, respectively.

### Claim 2 (depends on 1)

The organic light emitting device according to claim 1, wherein the light emitting layer and the first electron transport layer are disposed in contact with each other, the first electron transport layer and the second electron transport layer are disposed in contact with each other, the light emitting layer includes a fifth material,
the second material and the third material are the same compound, and the fourth material and the fifth material are the same compound.

### Claim 3 (depends on 2)

The organic light emitting device according to claim 2, wherein the fifth material is a hydrocarbon compound.

### Claim 4 (depends on 2)

The organic light emitting device according to claim 2, wherein the light emitting layer further includes a sixth material, and
relative to 100 wt % of a weight of the light emitting layer, the fifth material has a larger weight percentage than the sixth material in the light emitting layer.

### Claim 5 (depends on 4)

The organic light emitting device according to claim 4, wherein the sixth material is a light emitting material.

### Claim 6 (depends on 1)

The organic light emitting device according to claim 1, wherein at least one of the third material and the fourth material is an organic compound.

### Claim 7 (depends on 1)

The organic light emitting device according to claim 1, wherein the second material is a hydrocarbon compound.

### Claim 8 (depends on 1)

The organic light emitting device according to claim 1, wherein the first material is a heterocyclic compound.

### Claim 9 (depends on 8)

The organic light emitting device according to claim 8, wherein the heterocyclic compound is a compound including a nitrogen atom as a heteroatom.

### Claim 10 (depends on 1)

The organic light emitting device according to claim 1, wherein the second material includes an aryl group, the aryl group optionally having, as a substituent, an alkyl group having 1 to 12 carbon atoms, and the aryl group is selected from the group consisting of benzene, naphthalene, fluorene, benzofluorene, phenanthrene, chrysene, triphenylene, pyrene, fluoranthene, and benzofluoranthene.

### Claim 11 (depends on 1)

The organic light emitting device according to claim 1, wherein the light emitting layer includes a fifth material, and satisfies a relation:
Absolute value of HOMO energy of the fifth material<Absolute value of HOMO energy of the second material.

### Claim 12 (depends on 1)

The organic light emitting device according to claim 1, wherein the anode is an electrode configured to reflect light, and the cathode is an electrode configured to transmit light.

### Claim 13 (depends on 1)

The organic light emitting device according to claim 1, wherein the light emitting layer includes at least two layers.

### Claim 14 (depends on 1)

A display apparatus comprising a plurality of pixels,
wherein at least one of the plurality of pixels includes the organic light emitting device according to claim 1, and a transistor connected to the organic light emitting device.

### Claim 15 (depends on 1)

A photoelectric conversion apparatus comprising:
an optical unit including a plurality of lenses;
an image pickup device configured to receive light having passed through the optical unit; and
a display unit configured to display an image captured with the image pickup device, wherein the display unit includes the organic light emitting device according to claim 1.

### Claim 16 (depends on 1)

An electronic apparatus comprising:
a display unit including the organic light emitting device according to claim 1;
a housing provided with the display unit; and
a communication unit provided in the housing, and configured to communicate with an external device.

### Claim 17 (depends on 1)

An illumination apparatus comprising:
a light source including the organic light emitting device according to claim 1; and
a light diffusion unit or an optical film configured to transmit light emitted from the light source.

### Claim 18 (depends on 1)

A moving object comprising:
an illumination unit including the organic light emitting device according to claim 1; and
a body provided with the illumination unit.

### Claim 19 (depends on 1)

The organic light emitting device according to claim 1, wherein the second material and the third material are the same compound.

### Claim 20 (depends on 1)

The organic light emitting device according to claim 1, wherein the first electron transport layer and the second electron transport layer are disposed in contact with each other.

### Claim 21 (depends on 1)

The organic light emitting device according to claim 1, wherein the light emitting layer includes a fifth material, and
the fourth material and the fifth material are the same compound.

### Claim 22 (depends on 1)

The organic light emitting device according to claim 1, wherein the light emitting layer and the first electron transport layer are disposed in contact with each other.

### Claim 23 (depends on 1)

The organic light emitting device according to claim 1, wherein the third material, and the fourth material satisfy the following condition (c):
(c) |LUMO (third material)|>|LUMO (fourth material)|
where LUMO (third material), and LUMO (fourth material) represent a value of lowest unoccupied molecular orbital (LUMO) energy of the third material, and a value of LUMO energy of the fourth material, respectively.

### Claim 24 (depends on 1)

The organic light emitting device according to claim 1, wherein the first material, and the second material satisfy the following condition (d):
(c) |LUMO (first material)|>|LUMO (second material)|
where LUMO (first material), and LUMO (second material) represent a value of LUMO energy of the first material, and a value of LUMO energy of the second material, respectively.

### Claim 25 (depends on 1)

An electrophotographic image-forming apparatus, comprising an exposure light source including the organic light emitting device according to claim 1.