# US 11,910,629 B2 · Light emitting device, method of manufacturing the same, and display device

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- Number: US 11,910,629 B2
- Document ID: US11910629B2
- Status: Granted
- Kind: B2
- Application number: 18/076,495
- Filed: 2022-12-07
- Published: 2023-04-20
- Granted: 2024-02-20
- Earliest claimed: 2019-09-23
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Chan Su Kim; Kun Su Park; Tae Ho Kim; Eun Joo Jang; Dae Young Chung
- Web page: https://patentgrep.com/patent/US11910629B2

## CPC

- H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots
- H10K 50/15: Hole transporting layers
- H10K 50/155: comprising dopants
- H10K 50/156: {comprising a multilayered structure}
- H10K 71/135: {using ink-jet printing}
- H10K 71/40: Thermal treatment, e.g. annealing in the presence of a solvent vapour
- H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A light emitting device including a first electrode, a second electrode, a quantum dot layer disposed between the first electrode and the second electrode and a first auxiliary layer disposed between the quantum dot layer and the first electrode, wherein the first auxiliary layer includes nickel oxide nanoparticles having an average particle diameter of less than or equal to about nanometers (nm) and an organic ligand, a method of manufacturing the light emitting device, and a display device including the same.

## Claims

### Claim 1

A light emitting device comprising
a first electrode,
a second electrode,
a quantum dot layer disposed between the first electrode and the second electrode, and
a first auxiliary layer disposed between the quantum dot layer and the first electrode,
wherein the first auxiliary layer comprises nickel oxide nanoparticles having an average particle diameter of less than or equal to about 10 nanometers, and
wherein about 90% or greater of a total number of the nickel oxide nanoparticles in the first auxiliary layer have a particle size within ± about 30% of the average particle diameter of the nickel oxide nanoparticles.

### Claim 2 (depends on 1)

The light emitting device of claim 1, wherein the light emitting device further comprises a second auxiliary layer disposed between the first auxiliary layer and the quantum dot layer.

### Claim 3 (depends on 2)

The light emitting device of claim 2, wherein the second auxiliary layer comprises poly(9,9-dioctyl-fluorene-co-N-(4-butylphenyl)-diphenylamine, polyarylamine, poly(N-vinylcarbazole), poly(3,4-ethylenedioxythiophene), poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, polyaniline, polypyrrole, N,N,N′,N′-tetrakis (4-methoxyphenyl)-benzidine, 4-bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl, 4,4′,4″-tris[phenyl(m-tolyl)amino]triphenylamine, 4,4′,4″-tris(N-carbazolyl)-triphenylamine, 1,1-bis[(di-4-tolylamino)phenylcyclohexane, a p-type metal oxide, graphene oxide, or a combination thereof.

### Claim 4 (depends on 1)

The light emitting device of claim 1, wherein the light emitting device further comprises a third auxiliary layer disposed between the quantum dot layer and the second electrode, and
the second electrode and the third auxiliary layer comprise zinc oxide nanoparticles represented by Zn1-xMxO, wherein M is Mg, Ca, Zr, W, Li, Ti, or a combination thereof and 0≤x<0.5.

### Claim 5 (depends on 1)

The light emitting device of claim 1, wherein
the first electrode comprises an anode,
the second electrode comprises a cathode,
the quantum dot layer comprises a light emitting layer comprising a non-cadmium-based quantum dot, and
the first auxiliary layer comprises a hole auxiliary layer.

### Claim 6 (depends on 1)

A display device comprising the light emitting device of claim 1.

### Claim 7

A light emitting device comprising
a first electrode,
a second electrode,
a quantum dot layer disposed between the first electrode and the second electrode, and
a first auxiliary layer disposed between the quantum dot layer and the first electrode,
wherein the first auxiliary layer comprises nickel oxide nanoparticles having an average particle diameter of less than or equal to about 10 nanometers, and
wherein the first auxiliary layer further comprises an organic ligand derived from a substituted or unsubstituted C1 to C10 alkylamine compound, a substituted or unsubstituted C2 to C10 carboxylic acid compound, or a combination thereof.

### Claim 8 (depends on 7)

The light emitting device of claim 7, wherein about 90% or greater of a total number of the nickel oxide nanoparticles in the first auxiliary layer have a particle size within ± about 30% of the average particle diameter of the nickel oxide nanoparticles.

### Claim 9 (depends on 7)

The light emitting device of claim 7, wherein
the substituted or unsubstituted C1 to C10 alkylamine compound is a substituted or unsubstituted pentylamine, a substituted or unsubstituted hexylamine, a substituted or unsubstituted heptylamine, a substituted or unsubstituted octylamine, a substituted or unsubstituted nonylamine, or a combination thereof; or
the substituted or unsubstituted C2 to C10 carboxylic acid compound is a substituted or unsubstituted pentanoic acid, a substituted or unsubstituted hexanoic acid, a substituted or unsubstituted heptanoic acid, a substituted or unsubstituted octanoic acid, a substituted or unsubstituted nonanoic acid, or a combination thereof.

### Claim 10 (depends on 7)

The light emitting device of claim 7, wherein the organic ligand is present in an amount of less than or equal to about 30 weight percent, based on a total weight of the first auxiliary layer.

### Claim 11 (depends on 7)

A method of manufacturing the light emitting device of claim 7, comprising
providing the first electrode,
forming the first auxiliary layer comprising nickel oxide nanoparticles having the average particle diameter of less than or equal to about 10 nanometers on the first electrode,
forming the quantum dot layer on the first auxiliary layer, and
forming the second electrode on the quantum dot layer to manufacture the light emitting device,
wherein the forming the first auxiliary layer comprises
obtaining the nickel oxide nanoparticles from a precursor mixture comprising a nickel oxide precursor,
obtaining a composition for the first auxiliary layer comprising the nickel oxide nanoparticles, and
coating the composition for the first auxiliary layer to form the first auxiliary layer, and
wherein the obtaining the nickel oxide nanoparticles from the precursor mixture further comprises obtaining the organic ligand from the precursor mixture, the precursor mixture further comprises an organic ligand precursor, wherein the organic ligand precursor comprises the substituted or unsubstituted C1 to C10 alkylamine compound, the substituted or unsubstituted C2 to C10 carboxylic acid compound, or the combination thereof.

### Claim 12 (depends on 11)

The method of claim 11, wherein the forming the first auxiliary layer is performed by a solution process.

### Claim 13 (depends on 11)

The method of claim 11, wherein the obtaining the nickel oxide nanoparticles and the organic ligand comprises heat treating the precursor mixture at a temperature of less than or equal to about 150° C.

### Claim 14 (depends on 11)

The method of claim 11, wherein the coating the composition for the first auxiliary layer comprises coating the composition for the first auxiliary layer by a spin coating, a spray coating, a slit coating, a dip coating, an inkjet printing, a nozzle printing, a doctor blade coating, or a combination thereof.

### Claim 15 (depends on 11)

The method of claim 11, wherein the coating the composition for the first auxiliary layer comprises heat-treating at a temperature of less than 500° C.