# US 2022/0285646 A1 · Light emitting element and light emitting device

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- Number: US 2022/0285646 A1
- Document ID: US20220285646A1
- Status: Published application
- Kind: A1
- Application number: 17/634,712
- Filed: 2019-08-13
- Published: 2022-09-08
- Earliest claimed: 2019-08-13
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: KENJI KIMOTO
- Web page: https://patentgrep.com/patent/US20220285646A1

## CPC

- H10K 50/156: {comprising a multilayered structure}
- H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 50/166: {comprising a multilayered structure}
- H10K 50/17: Carrier injection layers
- H10K 50/171: {Electron injection layers}
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
- H10K 2102/00: Constructional details relating to the organic devices covered by this subclass
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

A light-emitting element includes: a first electrode which is an anode, a hole transport layer, a light-emitting layer, an electron transport layer, and a second electrode which is a cathode in this order; and an oxide layer which is a first oxide layer and an oxide layer which is a second oxide layer disposed in this order from the first electrode side between the first electrode and the hole transport layer or between the electron transport layer and the second electrode, wherein a density of oxygen atoms in the second oxide layer is different from a density of oxygen atoms in the first oxide layer.

## Claims

### Claim 1

A light-emitting element, comprising:
an anode, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode in this order; and
a first oxide layer and a second oxide layer that is in contact with the first oxide layer disposed in this order from a side closer to the anode between the anode and the hole transport layer or between the electron transport layer and the cathode,
wherein a density of oxygen atoms in the second oxide layer is different from a density of oxygen atoms in the first oxide layer.

### Claim 2 (depends on 1)

The light-emitting element according to claim 1,
wherein the density of oxygen atoms in the second oxide layer is less than the density of oxygen atoms in the first oxide layer.

### Claim at position 3

3-10. (canceled)

### Claim 11 (depends on 2)

The light-emitting element according to claim 2,
wherein at least one of the first oxide layer or the second oxide layer includes a polycrystalline oxide at a contact surface between the first oxide layer and the second oxide layer.

### Claim at position 5

12-13. (canceled)

### Claim 14 (depends on 2)

The light-emitting element according to claim 2,
wherein the first oxide layer or the second oxide layer is formed of an oxide in which a most abundant element other than oxygen is any one of Al, Ga, Ta, Zr, Hf, Mg, Ge, Si, Y, La, or Sr.

### Claim at position 7

15-19. (canceled)

### Claim 20 (depends on 1)

The light-emitting element according to claim 1,
wherein a total film thickness of the first oxide layer and the second oxide layer is from 0.4 nm to 5 nm.

### Claim 21

(canceled)

### Claim 22 (depends on 12)

The light-emitting element according to claim 12,
wherein the first oxide layer and the second oxide layer are disposed between the anode and the hole transport layer in this order from the anode side.

### Claim at position 11

23-28. (canceled)

### Claim 29 (depends on 22)

The light-emitting element according to claim 22,
wherein the hole transport layer is formed of an oxide, and
the hole transport layer is in contact with the second oxide layer, and at least at a contact surface between the hole transport layer and the second oxide layer, at least one of the hole transport layer or the second oxide layer includes a polycrystalline oxide.

### Claim 30 (depends on 22)

The light-emitting element according to claim 22,
wherein the hole transport layer is formed of an oxide, and
the hole transport layer is in contact with the second oxide layer, and a density of oxygen atoms in the hole transport layer is less than the density of oxygen atoms in the second oxide layer.

### Claim 31 (depends on 30)

The light-emitting element according to claim 30,
wherein the density of oxygen atoms in the hole transport layer is from 50% to 95% of the density of oxygen atoms in the second oxide layer.

### Claim 32

(canceled)

### Claim 33 (depends on 22)

The light-emitting element according to claim 22,
wherein the hole transport layer is formed of an oxide, and
the hole transport layer is in contact with the second oxide layer, and a density of oxygen atoms in the hole transport layer is greater than the density of oxygen atoms in the second oxide layer.

### Claim 34 (depends on 12)

The light-emitting element according to claim 12,
wherein the first oxide layer and the second oxide layer are disposed between the electron transport layer and the cathode in this order from the anode side.

### Claim at position 18

35-40. (canceled)

### Claim 41 (depends on 34)

The light-emitting element according to claim 34,
wherein the electron transport layer is formed of an oxide, and
the electron transport layer is in contact with the first oxide layer, and at least at a contact surface between the electron transport layer and the first oxide layer, at least one of the electron transport layer or the first oxide layer includes a polycrystalline oxide.

### Claim 42 (depends on 34)

The light-emitting element according to claim 34,
wherein the electron transport layer is formed of an oxide, and
wherein the electron transport layer is in contact with the first oxide layer, and a density of oxygen atoms in the first oxide layer is less than a density of oxygen atoms in the electron transport layer.

### Claim 43 (depends on 42)

The light-emitting element according to claim 42,
wherein the density of oxygen atoms in the first oxide layer is from 50% to 95% of the density of oxygen atoms in the electron transport layer.

### Claim 44

(canceled)

### Claim 45 (depends on 34)

The light-emitting element according to claim 34,
wherein the electron transport layer is in contact with the first oxide layer, the electron transport layer is formed of an oxide, and the density of oxygen atoms in the first oxide layer is greater than the density of oxygen atoms in the electron transport layer.

### Claim 46 (depends on 12)

The light-emitting element according to claim 12,
wherein the density of oxygen atoms in the second oxide layer is from 50% to 95% of the density of oxygen atoms in the first oxide layer.

### Claim 47

(canceled)

### Claim 48 (depends on 12)

The light-emitting element according to claim 12, further comprising:
a third oxide layer and a fourth oxide layer that is in contact with the third oxide layer disposed in this order from a side closer to the anode not between the anode and the hole transport layer and not between the electron transport layer and the cathode,
wherein a density of oxygen atoms in the fourth oxide layer is different from a density of oxygen atoms in the third oxide layer.

### Claim 49 (depends on 12)

The light-emitting element according to claim 12, further comprising:
a third oxide layer and a fourth oxide layer that is in contact with the third oxide layer disposed in this order from a side closer to the anode between the hole transport layer and the light-emitting layer or between the light-emitting layer and the electron transport layer,
wherein a density of oxygen atoms in the fourth oxide layer is different from a density of oxygen atoms in the third oxide layer.

### Claim 50 (depends on 1)

The light-emitting element according to claim 1,
wherein the density of oxygen atoms in the first oxide layer is less than the density of oxygen atoms in the second oxide layer.

### Claim 51

(canceled)

### Claim 52 (depends on 1)

A light-emitting device, comprising:
the light-emitting element according to claim 1.