# US 8,569,945 B2 · Organic light emitting device having cathode including a magnesium-calcium layer and method for fabricating the same

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- Number: US 8,569,945 B2
- Document ID: US8569945B2
- Status: Granted
- Kind: B2
- Application number: 11/291,905
- Filed: 2005-12-02
- Published: 2006-06-08
- Granted: 2013-10-29
- Earliest claimed: 2004-12-03
- Assignees: Samsung Display Co., Ltd.
- Applicants: Kwan-Hee Lee; Ja-Hyun Im
- Inventors: Kwan-Hee Lee; Ja-Hyun Im
- Web page: https://patentgrep.com/patent/US8569945B2

## CPC

- H10K 50/828: Transparent cathodes, e.g. comprising thin metal layers
- H10K 50/844: Encapsulations
- Y10T 428/24942: including components having same physical characteristic in differing degree
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An organic light emitting device and a method of fabricating the same are disclosed. The organic light emitting device includes an anode and a cathode that comprises a magnesium-calcium layer. An organic layer having at least an organic emission layer is interposed between the anode and the cathode. The organic light emitting device may have reduced driving voltage characteristics, increased luminous efficiency characteristics, and improved lifespan characteristics without forming a separate electron injection layer because of the excellent electron injection characteristics.

## Claims

### Claim 1

An organic light emitting device, comprising:
an anode;
a magnesium-calcium layer; and
an organic layer interposed between the anode and the magnesium-calcium layer,
wherein the organic layer comprises at least an organic emission layer, and
wherein the magnesium-calcium layer comprises magnesium and calcium in an atomic ratio of about 1:1.

### Claim 2 (depends on 1)

The organic light emitting device of claim 1, further comprising:
a capping layer in contact with a surface of the magnesium-calcium layer opposite a surface of the magnesium-calcium layer that is in contact with the organic layer.

### Claim 3 (depends on 2)

The organic light emitting device of claim 2,
wherein the capping layer is selected from the group consisting of an organic layer, an inorganic layer, and a multilayer of the organic layer and the inorganic layer.

### Claim 4 (depends on 3)

The organic light emitting device of claim 3,
wherein the inorganic layer is selected from the group consisting of a silicon oxide (SiO2) layer, a silicon nitride (SiNx) layer, and a silicon oxynitride (SiOxNy) layer.

### Claim 5 (depends on 3)

The organic light emitting device of claim 3,
wherein the inorganic layer is selected from the group consisting of an indium tin oxide (ITO) layer, an indium zinc oxide (IZO) layer, a tin oxide (TN) layer, and a zinc oxide (ZnO) layer.

### Claim 6 (depends on 3)

The organic light emitting device of claim 3,
wherein the inorganic layer is a lithium fluoride (LiF) layer.

### Claim 7 (depends on 3)

The organic light emitting device of claim 3,
wherein the organic layer of the capping layer comprises at least one selected from the group consisting of NPB, TNATA, TCTA, TDAPB, TDATA, Alq3, Balq and CBP.

### Claim 8 (depends on 1)

The organic light emitting device of claim 1,
wherein the organic layer further comprises an electron transport layer interposed between the magnesium-calcium layer and the organic emission layer, and
wherein the electron transport layer contacts the magnesium-calcium layer.

### Claim 9 (depends on 1)

The organic light emitting device of claim 1,
wherein the organic layer further comprises at least one of a hole injection layer and a hole transport layer interposed between the anode and the organic emission layer.

### Claim 10

An organic light emitting device, comprising:
an anode;
a magnesium-calcium layer being about 400 Å or less thick; and
an organic layer interposed between the anode and the magnesium-calcium layer,
wherein the organic layer comprises at least an organic emission layer, and
wherein the magnesium-calcium layer comprises magnesium and calcium in an atomic ratio of about 1:1.

### Claim 11 (depends on 10)

The organic light emitting device of claim 10,
wherein the magnesium-calcium layer is about 100 Å or more thick.

### Claim 12 (depends on 11)

The organic light emitting device of claim 11,
wherein the magnesium-calcium layer is about 200 Å to about 300 Å thick.

### Claim 13 (depends on 10)

The organic light emitting device of claim 10, further comprising:
a capping layer that is in contact with a surface of the magnesium-calcium layer opposite a surface of the magnesium-calcium layer in contact with the organic layer.

### Claim 14 (depends on 13)

The organic light emitting device of claim 13,
wherein the capping layer is a transparent capping layer.

### Claim 15 (depends on 13)

The organic light emitting device of claim 13,
wherein the capping layer has a refractive index that is larger than that of the magnesium-calcium layer.

### Claim 16 (depends on 15)

The organic light emitting device of claim 15,
wherein the capping layer has a refractive index of about 1.3 to about 2.3.

### Claim 17 (depends on 13)

The organic light emitting device of claim 13,
wherein the capping layer is selected from the group consisting of an organic layer, an inorganic layer, and a multilayer of the organic layer and the inorganic layer.