# US 11,309,507 B2 · Control of the position of quantum dots in emissive layer of quantum dot light emitting diode

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- Number: US 11,309,507 B2
- Document ID: US11309507B2
- Status: Granted
- Kind: B2
- Application number: 16/910,339
- Filed: 2020-06-24
- Published: 2021-12-30
- Granted: 2022-04-19
- Earliest claimed: 2020-06-24
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Enrico Angioni
- Web page: https://patentgrep.com/patent/US11309507B2

## CPC

- 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 50/80: Constructional details
- H10K 71/15: characterised by the solvent used
- H10K 71/441: {in the presence of solvent vapors, e.g. solvent vapour annealing}
- H10K 85/631: {Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine}
- H10K 2101/80: {Composition varying spatially, e.g. having a spatial gradient}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A light-emitting device includes an anode, cathode, and a combined charge transport and emissive layer (CCTEL) disposed on a deposition surface between the anode and cathode. The CCTEL includes a crosslinked charge transport material and quantum dots, the quantum dots distributed unevenly within the crosslinked charge transport material and arranged relative to the deposition layer. The quantum dots include nucleophilic or electrophilic centers and ligands respectively bonded to the quantum dots. The deposition surface has nucleophilic or electrophilic properties. A method of forming the CCTEL includes the steps of depositing a mixture on a deposition surface having nucleophilic or electrophilic properties. The mixture includes a solvent, cross-linkable charge transport material, and quantum dots comprising nucleophilic or electrophilic centers and ligands respectively bonded to the quantum dots. At least a portion of the mixture to an activation stimulus to crosslink the cross-linkable material.

## Claims

### Claim 1

A light-emitting device, comprising:
an anode;
a cathode; and
a combined charge transport and emissive layer disposed on a deposition surface between the anode and the cathode, the combined charge transport and emissive layer comprising crosslinked charge transport material and quantum dots, the quantum dots distributed unevenly within the crosslinked charge transport material and arranged relative to the deposition surface,
wherein the quantum dots comprise nucleophilic or electrophilic centers and ligands respectively bonded to the quantum dots, and
wherein the deposition surface has nucleophilic or electrophilic properties.

### Claim 2 (depends on 1)

The light-emitting device of claim 1, wherein the deposition surface comprises chelating ligands.

### Claim 3 (depends on 1)

The light-emitting device of claim 1, wherein the deposition surface is a dithiol functionalized surface.

### Claim 4 (depends on 1)

The light-emitting device of claim 1, further comprising an interlayer disposed in contact with the combined charge transport and emissive layer, wherein the deposition surface is a surface of the interlayer.

### Claim 5 (depends on 1)

The light-emitting device of claim 1, wherein at least 75% of the quantum dots are located in a half portion of the combined charge transport and emissive layer closest to the deposition surface, and at least a portion of the quantum dots are bonded to the deposition surface.

### Claim 6 (depends on 1)

The light-emitting device of claim 1, wherein at least 75% of the quantum dots are located in a half portion of the combined charge transport and emissive layer distal to the deposition surface.

### Claim 7 (depends on 1)

The light-emitting device of claim 1, wherein the deposition surface is a surface of the anode.

### Claim 8 (depends on 1)

The light-emitting device of claim 1, wherein the deposition surface is a surface of the cathode.

### Claim 9 (depends on 1)

The light-emitting device of claim 1, further comprising an electron transport layer disposed between the anode and the cathode,
wherein the deposition surface is a surface of the electron transport layer.

### Claim 10 (depends on 1)

The light-emitting device of claim 1, further comprising a hole transport layer disposed between the anode and the cathode,
wherein the deposition surface is a surface of the hole transport layer.

### Claim 11 (depends on 1)

The light-emitting device of claim 1, wherein the quantum dots comprise ligands having an electrophilic center and a nucleophilic center, and at least a portion of the ligands are bonded to the deposition surface.

### Claim 12 (depends on 1)

A bank structure of multiple light-emitting devices comprising:
a first light emitting device and a second light emitting device, each of the first and second light emitting devices being a light emitting device according to claim 1;
an insulating material that separates at least a portion of the first light-emitting device from the second light emitting device;
wherein the first light-emitting device and the second light-emitting device are configured to emit different wavelengths.