# US 2022/0037604 A1 · Light-emitting device and manufacturing method of light-emitting device

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- Number: US 2022/0037604 A1
- Document ID: US20220037604A1
- Status: Published application
- Kind: A1
- Application number: 17/277,269
- Filed: 2018-09-18
- Published: 2022-02-03
- Earliest claimed: 2018-09-18
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: HISAYUKI UTSUMI; YOUHEI NAKANISHI; MASAYUKI KANEHIRO; SHOTA OKAMOTO; HIROKI IMABAYASHI; TATSUYA RYOHWA; KANAKO NAKATA
- Web page: https://patentgrep.com/patent/US20220037604A1

## CPC

- H10K 71/15: characterised by the solvent used
- H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
- 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 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 50/171: {Electron injection layers}
- H10K 71/135: {using ink-jet printing}
- H10K 85/115: {Polyfluorene; Derivatives thereof}
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 2102/00: Constructional details relating to the organic devices covered by this subclass
- 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 an anode, a hole transport layer, a quantum dot light-emitting layer, an electron transport layer, and a cathode, in this order. The electron transport layer includes a particulate metal oxide and a conductive resin that disperses the metal oxide.

## Claims

### Claim 1

A light-emitting element comprising:
an anode;
a hole transport layer;
a quantum dot light-emitting layer;
an electron transport layer; and
a cathode, in this order,
wherein the electron transport layer includes a particulate metal oxide and a conductive resin that disperses the metal oxide and
the conductive resin is Poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)].

### Claim 2 (depends on 1)

The light-emitting element according to claim 1,
wherein the conductive resin is light-transmissive.

### Claim 3

(canceled)

### Claim 4 (depends on 1)

The light-emitting element according to claim 1,
wherein the metal oxide is zinc oxide, and a volume ratio between the zinc oxide and the conductive resin (zinc oxide/conductive resin) is from 60/40 to 95/5.

### Claim 5 (depends on 1)

The light-emitting element according to claim 1,
wherein an electron mobility of the metal oxide is greater than an electron mobility of the conductive resin.

### Claim 6 (depends on 1)

The light-emitting element according to claim 1,
wherein a solvent used when mixing the metal oxide and the conductive resin is at least one solvent selected from toluene, chlorobenzene, phenylcyclohexane, ethylene glycol monophenyl ether, isopropyl biphenyl, and 1,1-bis (3,4-dimethylphenyl) ethane.

### Claim 7 (depends on 1)

The light-emitting element according to claim 1, further comprising:
an electron injection layer provided between the electron transport layer and the cathode.

### Claim 8 (depends on 7)

The light-emitting element according to claim 7,
wherein the electron injection layer includes the conductive resin.

### Claim 9 (depends on 1)

The light-emitting element according to claim 1,
wherein the quantum dot light-emitting layer includes quantum dot light-emitting layers for each of colors, the quantum dot light-emitting layers respectively emitting red light, green light, and blue light.

### Claim 10 (depends on 9)

The light-emitting element according to claim 9,
wherein a common material is used for the electron transport layer with respect to the quantum dot light-emitting layers for each of the colors of the red light, the green light, and the blue light.

### Claim 11 (depends on 10)

The light-emitting element according to claim 10,
wherein the electron transport layer is a common layer.

### Claim 12 (depends on 1)

The light-emitting element according to claim 1,
wherein a volume solid resistance value of the conductive resin is not more than 1.0 [Ωcm].

### Claim 13 (depends on 1)

A method for manufacturing the light-emitting element according to claim 1, the method comprising:
layering an electron transport layer on a quantum dot light-emitting layer after the quantum dot light-emitting layer is cured.

### Claim 14 (depends on 13)

The method for manufacturing the light-emitting element according to claim 13,
wherein the quantum dot light-emitting layer is formed at no higher than 150° C.

### Claim 15 (depends on 13)

The method for manufacturing the light-emitting element according to claim 13,
wherein the electron transport layer is ink-jet coated.