# US 2018/0323407 A1 · Organic light emitting device and a method of fabricating thereof

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- Number: US 2018/0323407 A1
- Document ID: US20180323407A1
- Status: Published application
- Kind: A1
- Application number: 15/541,545
- Filed: 2017-06-15
- Published: 2018-11-08
- Earliest claimed: 2017-05-02
- Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd.
- Inventors: Zhixiong JIANG
- Web page: https://patentgrep.com/patent/US20180323407A1

## CPC

- H10K 50/17: Carrier injection layers
- H10K 50/814: combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
- H10K 50/82: Cathodes
- H10K 71/12: using liquid deposition, e.g. spin coating
- H10K 71/15: characterised by the solvent used
- H10K 85/00: Organic materials used in the body or electrodes of devices covered by this subclass
- H10K 85/791: {Starburst compounds}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 85/1135: {Polyethylene dioxythiophene [PEDOT]; Derivatives thereof}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

The present application discloses an organic light emitting device and a method of fabricating thereof, the method of fabricating including the steps: providing a substrate; disposing an anode layer on the substrate; forming a hole injection layer on the anode layer by a first solution; forming an emitting material layer on the hole injection layer by a second solution, wherein the hole injection layer is insoluble in the second solution; forming an electron transport layer on the emitting material layer by a third solution, wherein the emitting material layer is insoluble in the third solution; forming a cathode layer on the electron transport layer. Therefore, present application is capable of fabricating a fine device structure.

## Claims

### Claim 1

A method of fabricating of an organic light emitting device comprising the following steps:
providing a substrate;
disposing an anode layer and an auxiliary electrode on the substrate, wherein the anode layer has a high work function and a light transmittance property;
forming a hole injection layer on the anode layer by a first solution;
forming an emitting material layer on the hole injection layer by a second solution, wherein the hole injection layer is insoluble in the second solution;
forming an electron transport layer on the emitting material layer by a third solution, wherein the emitting material layer is insoluble in the third solution; and
forming a cathode layer on the electron transport layer, wherein the cathode layer is formed by metals with a low work function, or a composite metal.

### Claim 2 (depends on 1)

The method of fabricating of the organic light emitting device according to claim 1, wherein the material of the hole injection layer is PEDOT: PSS material, and the material of the emitting material layer is a first non-polar type solvent-soluble organic material, and the material of the electron transport layer is a polar type solvent-soluble organic material;
wherein, the first non-polar type solvent comprising an alkanes-based solvent, and the polar type solvent comprising an aqueous solvent and an alcohol solvent;
the step of forming the hole injection layer on the anode layer by the first solution comprising:
forming the PEDOT: PSS solution by dissolving the PEDOT: PSS material by aqueous solvent;
disposing the PEDOT: PSS solution on the anode layer to form the hole injection layer;
the step of forming the emitting material layer on the hole injection layer by the second solution comprising:
forming an alkane-based solution by dissolving the material of the emitting material layer by the alkane-based solvent;
disposing the alkane-based solution on the hole-injecting layer to form the emitting material layer;
the step of forming the electron transport layer on the emitting material layer by the third solution comprising:
forming an aqueous solution or an alcohol solution by dissolving the material of the electron transport layer by the aqueous solvent or the alcohol solvent; and
disposing the aqueous solution or the alcohol solution on the emitting material layer to form the electron transport layer.

### Claim 3 (depends on 2)

The method of fabricating of the organic light emitting device according to claim 2, wherein the organic light emitting device further comprising an electron blocking layer, the material of the electron blocking layer is a second non-polar type solvent-soluble organic material, wherein the second non-polar type solvent comprising a benzene solvent, a xylene solvent, a chlorobenzene solvent or a chloroform solvent;
after the step of forming the hole injection layer on the anode layer by the first solution further comprising the step of:
forming a benzene solution, a xylene solution, a chlorobenzene solution or a chloroform solution by dissolving the material of the electron blocking layer by the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent; and
disposing the benzene solution, the xylene solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the electron blocking layer.

### Claim 4 (depends on 2)

The method of fabricating of the organic light emitting device according to claim 2, wherein the organic light emitting device further comprising a hole transport layer, the material of the hole transport layer is the second non-polar type solvent-soluble organic material, wherein the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent;
after the step of forming the hole injection layer on the anode layer by the first solution further comprising the step of:
forming the benzene solution, the xylene solution, the chlorobenzene solution or the chloroform solution by dissolving the material of the hole transport layer by the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent; and
disposing the benzene solution, the xylene solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the hole transport layer.

### Claim 5 (depends on 1)

The method of fabricating of the organic light emitting device according to claim 1, wherein the organic light emitting device further comprising a hole blocking layer, the material of the hole blocking layer is a first non-polar type solvent-soluble organic material; the material of the hole injection layer is PEDOT: PSS material, the material of the emitting material layer is the second non-polar type solvent-soluble organic material, the material of the electron transport layer is the polar type solvent-soluble organic material.;
wherein the first non-polar type solvent comprising an alkane-based solvent, the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent and the chloroform solvent, the polar type solvent comprising the aqueous solvent or the alcohol solvent;
the step of forming the hole injection layer on the anode layer by the first solution comprising:
forming the PEDOT: PSS solution by dissolving the PEDOT: PSS material by aqueous solvent;
disposing the PEDOT: PSS solution on the anode layer to form the hole injection layer;
the step of forming the emitting material layer on the hole injection layer by the second solution comprising:
forming the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution by dissolving the material of the emitting material layer in the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent;
disposing the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the emitting material layer;
after the step of forming the emitting material layer on the hole injection layer by the second solution further comprising the step of:
forming the alkane-based solution by dissolving the material of the hole blocking layer in the alkane-based solvent;
disposing the alkane-based solution on the emitting material layer to form the hole blocking layer;
the step of forming the electron transport layer on the emitting material layer by the third solution comprising:
forming the aqueous solution or the alcohol solution by dissolving the material of the electron transport layer by the aqueous solvent or the alcohol solvent; and
disposing the aqueous solution or the alcohol solution the hole blocking layer to form the electron transport layer.

### Claim 6 (depends on 1)

The method of fabricating of the organic light emitting device according to claim 1, wherein the material of the hole injection layer is a PEDOT: PSS material, the material of the electron transport layer is the first non-polar type solvent-soluble organic material, and the material of the emitting material layer is the second non-polar type solvent-soluble organic material, wherein the first non-polar type solvent comprising the alkane-based solvent, the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent and the chloroform solvent;
the step of forming the hole injection layer on the anode layer by the first solution comprising:
forming the PEDOT: PSS solution by dissolving the PEDOT: PSS material by aqueous solvent;
disposing the PEDOT: PSS solution on the anode layer to form the hole injection layer;
the step of forming the emitting material layer on the hole injection layer by the second solution comprising:
forming the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution by dissolving the material of the emitting material layer in the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent;
disposing the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the emitting material layer;
the step of forming the electron transport layer on the emitting material layer by the third solution comprising:
forming the alkane-based solution by dissolving the material of the electron transport layer by the alkane-based solvent; and
disposing the alkane-based solution the emitting material layer to form the electron transport layer.

### Claim 7

A method of fabricating of an organic light emitting device comprising the following steps:
providing a substrate;
disposing an anode layer on the substrate;
forming a hole injection layer on the anode layer by a first solution;
forming an emitting material layer on the hole injection layer by a second solution, wherein the hole injection layer is insoluble in the second solution;
forming an electron transport layer on the emitting material layer by a third solution, wherein the emitting material layer is insoluble in the third solution; and
forming a cathode layer on the electron transport layer.

### Claim 8 (depends on 7)

The method of fabricating of the organic light emitting device according to claim 7, wherein the material of the hole injection layer is PEDOT: PSS material, and the material of the emitting material layer is a first non-polar type solvent-soluble organic material, and the material of the electron transport layer is a polar type solvent-soluble organic material;
wherein, the first non-polar type solvent comprising an alkanes-based solvent, and the polar type solvent comprising an aqueous solvent and an alcohol solvent;
the step of forming the hole injection layer on the anode layer by the first solution comprising:
forming the PEDOT: PSS solution by dissolving the PEDOT: PSS material by aqueous solvent;
disposing the PEDOT: PSS solution on the anode layer to form the hole injection layer;
the step of forming the emitting material layer on the hole injection layer by the second solution comprising:
forming an alkane-based solution by dissolving the material of the emitting material layer by the alkane-based solvent;
disposing the alkane-based solution on the hole-injecting layer to form the emitting material layer;
the step of forming the electron transport layer on the emitting material layer by the third solution comprising:
forming an aqueous solution or an alcohol solution by dissolving the material of the electron transport layer by the aqueous solvent or the alcohol solvent; and
disposing the aqueous solution or the alcohol solution on the emitting material layer to form the electron transport layer.

### Claim 9 (depends on 8)

The method of fabricating of the organic light emitting device according to claim 8, wherein the organic light emitting device further comprising an electron blocking layer, the material of the electron blocking layer is a second non-polar type solvent-soluble organic material, wherein the second non-polar type solvent comprising a benzene solvent, a xylene solvent, a chlorobenzene solvent or a chloroform solvent;
after the step of forming the hole injection layer on the anode layer by the first solution further comprising the step of:
forming a benzene solution, a xylene solution, a chlorobenzene solution or a chloroform solution by dissolving the material of the electron blocking layer by the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent; and
disposing the benzene solution, the xylene solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the electron blocking layer.

### Claim 10 (depends on 8)

The method of fabricating of the organic light emitting device according to claim 8, wherein the organic light emitting device further comprising a hole transport layer, the material of the hole transport layer is the second non-polar type solvent-soluble organic material, wherein the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent;
after the step of forming the hole injection layer on the anode layer by the first solution further comprising the step of:
forming the benzene solution, the xylene solution, the chlorobenzene solution or the chloroform solution by dissolving the material of the hole transport layer by the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent; and
disposing the benzene solution, the xylene solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the hole transport layer.

### Claim 11 (depends on 7)

The method of fabricating of the organic light emitting device according to claim 7, wherein the organic light emitting device further comprising a hole blocking layer, the material of the hole blocking layer is a first non-polar type solvent-soluble organic material; the material of the hole injection layer is PEDOT: PSS material, the material of the emitting material layer is the second non-polar type solvent-soluble organic material, the material of the electron transport layer is the polar type solvent-soluble organic material;
wherein the first non-polar type solvent comprising an alkane-based solvent, the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent and the chloroform solvent, the polar type solvent comprising the aqueous solvent or the alcohol solvent;
the step of forming the hole injection layer on the anode layer by the first solution comprising:
forming the PEDOT: PSS solution by dissolving the PEDOT: PSS material by aqueous solvent;
disposing the PEDOT: PSS solution on the anode layer to form the hole injection layer;
the step of forming the emitting material layer on the hole injection layer by the second solution comprising:
forming the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution by dissolving the material of the emitting material layer in the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent;
disposing the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the emitting material layer;
after the step of forming the emitting material layer on the hole injection layer by the second solution further comprising the step of:
forming the alkane-based solution by dissolving the material of the hole blocking layer in the alkane-based solvent;
disposing the alkane-based solution on the emitting material layer to form the hole blocking layer;
the step of forming the electron transport layer on the emitting material layer by the third solution comprising:
forming the aqueous solution or the alcohol solution by dissolving the material of the electron transport layer by the aqueous solvent or the alcohol solvent; and
disposing the aqueous solution or the alcohol solution the hole blocking layer to form the electron transport layer.

### Claim 12 (depends on 7)

The method of fabricating of the organic light emitting device according to claim 7, wherein the material of the hole injection layer is a PEDOT: PSS material, the material of the electron transport layer is the first non-polar type solvent-soluble organic material, and the material of the emitting material layer is the second non-polar type solvent-soluble organic material, wherein the first non-polar type solvent comprising the alkane-based solvent, the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent and the chloroform solvent;
the step of forming the hole injection layer on the anode layer by the first solution comprising:
forming the PEDOT: PSS solution by dissolving the PEDOT: PSS material by aqueous solvent;
disposing the PEDOT: PSS solution on the anode layer to form the hole injection layer;
the step of forming the emitting material layer on the hole injection layer by the second solution comprising:
forming the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution by dissolving the material of the emitting material layer in the benzene solvent, the xylene solvent, the chlorobenzene solvent or the chloroform solvent;
disposing the benzene solution, the dimethyl solution, the chlorobenzene solution or the chloroform solution on the hole injection layer to form the emitting material layer;
the step of forming the electron transport layer on the emitting material layer by the third solution comprising:
forming the alkane-based solution by dissolving the material of the electron transport layer by the alkane-based solvent; and
disposing the alkane-based solution the emitting material layer to form the electron transport layer.

### Claim 13

An organic light emitting device, comprising:
a substrate;
an anode layer disposed on the substrate;
a hole injection layer disposed on the anode layer, wherein the hole injection layer is formed by a first solution;
an emitting material layer disposed on the hole injection layer, wherein the emitting material layer is formed by a second solution, the hole injection layer is insoluble in the second solution;
an electron transport layer disposed on the emitting material layer, wherein the electron transport layer is formed by the third solution, the emitting material layer is insoluble in the third solution; and
a cathode layer disposed on the electron transport layer.

### Claim 14 (depends on 13)

The organic light emitting device according to claim 13, wherein the material of the hole injection layer is a PEDOT: PSS material, the material of the emitting material layer is the first non-polar type solvent-soluble organic material, and the material of the electron transport layer is a polar type solvent-soluble organic material; and
wherein the first non-polar type solvent comprising an alkane-based solvent, the polar type solvent comprising an aqueous solvent or an alcohol solvent.

### Claim 15 (depends on 13)

The organic light emitting device according to claim 13, wherein the organic light emitting device further comprising an electron blocking layer, the material of the electron blocking layer is a second non-polar type solvent-soluble organic material, wherein, the second non-polar type solvent comprising a benzene solvent, a xylene solvent, a chlorobenzene solvent and a chloroform solvent.

### Claim 16 (depends on 13)

The organic light emitting device according to claim 13, wherein the organic light emitting device further comprising a hole transport layer, the material of the hole transport layer is the second non-polar type solvent-soluble organic material, wherein, the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent and the chloroform solvent.

### Claim 17 (depends on 13)

The organic light emitting device according to claim 13, wherein the organic light emitting device further comprising a hole blocking layer, the material of the hole blocking layer is the first non-polar type solvent-soluble organic materials;
the material of the hole injection layer is the PEDOT: PSS material, the material of the emitting material layer is the second non-polar type solvent-soluble organic material, the material of the electron transport layer is a polar type solvent-soluble organic material; and
wherein the wherein the first non-polar type solvent comprising an alkane-based solvent, the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent and the chloroform solvent and the polar type solvent comprising an aqueous solvent or an alcohol solvent.

### Claim 18 (depends on 14)

The organic light emitting device according to claim 14, wherein the material of the hole injection layer is a PEDOT: PSS material, the material of the electron transport layer is the first non-polar type solvent-soluble organic material, and the material of the emitting material layer is a second non-polar type solvent-soluble organic material; and
wherein the first non-polar type solvent comprising an alkane-based solvent, the second non-polar type solvent comprising the benzene solvent, the xylene solvent, the chlorobenzene solvent and the chloroform solvent and the polar type solvent comprising an aqueous solvent or an alcohol solvent.