# US 11,910,627 B2 · Organic light emitting device and organic light emitting display device using the same

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- Number: US 11,910,627 B2
- Document ID: US11910627B2
- Status: Granted
- Kind: B2
- Application number: 17/466,834
- Filed: 2021-09-03
- Published: 2022-06-02
- Granted: 2024-02-20
- Earliest claimed: 2020-12-01
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Changeun Kim; Sujeong Lee
- Web page: https://patentgrep.com/patent/US11910627B2

## CPC

- H10K 59/126: Shielding, e.g. light-blocking means over the TFTs
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 59/80516: {combined with auxiliary electrodes, e.g. ITO layer combined with metal lines}
- H10K 59/80522: {combined with auxiliary electrodes}
- H10K 2102/102: {comprising tin oxides, e.g. fluorine-doped SnO2}
- H10K 2102/103: {comprising indium oxides, e.g. ITO}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light-emitting device an improved anode structure and an organic electroluminescent display device using the same are provided. The anode structure has a 3 layers stack structure in which a layer closest to an organic light-emissive layer of the organic light-emitting device is made of a material with a high work function such as 5.1 to 5.3 eV. Thus, hole injection efficiency is improved and occurrence of dark spots is suppressed.

## Claims

### Claim 1

An organic light-emitting device comprising:
an anode;
an organic light-emissive layer on the anode; and
a cathode on the organic light-emissive layer, wherein the anode includes:
a first layer;
a second layer on the first layer, wherein the second layer includes a metal; and
a third layer on the second layer, wherein the third layer has a higher work function than a work function of the first layer,
wherein the third layer includes copper aluminum oxide, wherein the copper aluminum oxide is composed of about 50 to 60% by weight of CuO and about 40 to 50% by weight of AlxGa2−x O3 (O≤x≤2).

### Claim 2 (depends on 1)

The organic light-emitting device of claim 1, wherein the first layer includes one or more of indium tin oxide or indium zinc oxide.

### Claim 3 (depends on 1)

The organic light-emitting device of claim 1, wherein the metal of the second layer includes at least one of silver or molybdenum.

### Claim 4 (depends on 1)

The organic light-emitting device of claim 1, wherein the third layer has a work function of about 5.1 to 5.3 eV.

### Claim 5 (depends on 1)

The organic light-emitting device of claim 1, wherein the third layer includes copper aluminum oxide, copper gallium oxide, or copper aluminum gallium oxide.

### Claim 6 (depends on 5)

The organic light-emitting device of claim 5, wherein the third layer has a resistivity of about 102 to 105 Ω·cm.

### Claim 7 (depends on 1)

The organic light-emitting device of claim 1, wherein the third layer has a thickness of about 50 to 150 Å.

### Claim 8

An organic electroluminescent display device comprising:
a first substrate;
a thin-film transistor on the first substrate;
an anode on the first substrate having the thin-film transistor, where the anode is electrically coupled to the thin-film transistor;
an organic light-emissive layer on the anode; and
a cathode on the organic light-emissive layer,
wherein the anode includes:
a first layer;
a second layer on the first layer, wherein the second layer includes a metal; and
a third layer on the second layer, wherein the third layer has a higher work function than a work function of the first layer,
wherein the third layer includes copper aluminum oxide, wherein the copper aluminum oxide is composed of about 50 to 60% by weight of CuO and about 40 to 50% by weight of AlxGa2−x O3 (0≤x≤2).

### Claim 9 (depends on 8)

The organic electroluminescent display device of claim 8, wherein the organic electroluminescent display device further comprises a cathode auxiliary electrode substantially coplanar with the anode, and electrically coupled to the cathode.

### Claim 10 (depends on 8)

The organic electroluminescent display device of claim 8, wherein the first layer includes either indium tin oxide or indium zinc oxide.

### Claim 11 (depends on 8)

The organic electroluminescent display device of claim 8, wherein the metal of the second layer includes at least one of silver or molybdenum.

### Claim 12 (depends on 8)

The organic electroluminescent display device of claim 8, wherein the third layer has a work function of about 5.1 to 5.3 eV.

### Claim 13 (depends on 8)

The organic electroluminescent display device of claim 8, wherein the third layer includes copper aluminum oxide, copper gallium oxide, or copper aluminum gallium oxide.

### Claim 14 (depends on 13)

The organic electroluminescent display device of claim 13, wherein the third layer has a resistivity of about 102 to 105 Ω·cm.

### Claim 15 (depends on 8)

The organic electroluminescent display device of claim 8, wherein the third layer has a thickness of about 50 to 150 Å.