# US 12,010,862 B2 · Electroluminescent devices with hybrid organic-inorganic transport layers

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- Number: US 12,010,862 B2
- Document ID: US12010862B2
- Status: Granted
- Kind: B2
- Application number: 17/507,416
- Filed: 2021-10-21
- Published: 2022-04-28
- Granted: 2024-06-11
- Earliest claimed: 2020-10-22
- Assignees: Shoei Chemical Inc.
- Applicants: Shoei Chemical Inc.
- Inventors: Daekyoung Kim; Ruiqing Ma; Emma Dohner; Donald Zehnder
- Web page: https://patentgrep.com/patent/US12010862B2

## CPC

- H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 50/16: Electron transporting layers
- H10K 50/165: comprising dopants
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 2101/40: Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
- H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Embodiments of an electroluminescent device are described. The electroluminescent device includes a substrate, a first electrode disposed on the substrate, an emission layer comprising luminescent nanostructures disposed on the first electrode, a hybrid transport layer disposed on the emission layer, and a second electrode disposed on the hybrid transport layer. The hybrid transport layer includes an organic layer and inorganic nanostructures disposed within the organic layer. The luminescent nanostructures are separated from the inorganic nanostructures by the organic layer.

## Claims

### Claim 1

An electroluminescent device comprising:
a substrate;
a first electrode disposed on the substrate;
an emission layer comprising luminescent nanostructures disposed on the first electrode;
a hybrid transport layer disposed on the emission layer, wherein the hybrid transport layer comprises an organic layer and inorganic nanostructures disposed within the organic layer, wherein the luminescent nanostructures are separated from the inorganic nanostructures by the organic layer, and wherein the organic layer and the luminescent nanostructures do not react chemically with each other; and
a second electrode disposed on the hybrid transport layer.

### Claim 2 (depends on 1)

The electroluminescent device of claim 1, wherein an organic material of the organic layer and an inorganic material of the inorganic nanostructures are soluble in a common organic solvent.

### Claim 3 (depends on 1)

The electroluminescent device of claim 1, wherein an organic material of the organic layer and an inorganic material of the inorganic nanostructures are soluble in alcohol, acetone, or acetonitrile.

### Claim 4 (depends on 1)

The electroluminescent device of claim 1, wherein the organic layer comprises an organic material with two or more phosphonic oxide functional groups (P═O).

### Claim 5 (depends on 1)

The electroluminescent device of claim 1, wherein the organic layer comprises (1,3,5-Triazine-2,4,6-triyl)tris(benzene-3, 1-diyl)tris(diphenylphosphine oxide), 2,4,6-Tris [3-(diphenylphosphinyl)phenyl]-1,3,5-triazine, which has three phosphonic oxide functional groups (P═O).

### Claim 6 (depends on 1)

The electroluminescent device of claim 1, wherein the inorganic nanostructures comprise a metal oxide.

### Claim 7 (depends on 1)

The electroluminescent device of claim 1, wherein the inorganic nanostructures comprise diameters about 5 to about 20 times smaller than diameters of the luminescent nano structures.

### Claim 8 (depends on 1)

The electroluminescent device of claim 1, wherein the luminescent nanostructures are disposed within a matrix material that is disposed on the emission layer.

### Claim 9 (depends on 1)

The electroluminescent device of claim 1, wherein the luminescent nanostructures comprise a first population of quantum dots configured to emit red light and a second population of quantum dots configured to emit green light.

### Claim 10 (depends on 1)

The electroluminescent device of claim 1, further comprising a hole transport layer disposed between the first electrode and the emission layer.

### Claim 11

A display device comprising:
an array of pixels; and
a display screen disposed on the array of pixels,
wherein each pixel of the array of pixel comprises first and second electroluminescent devices, wherein each of the first and second electroluminescent devices comprises:
an emission layer comprising luminescent nanostructures, and
a hybrid transport layer disposed on the emission layer, wherein the hybrid transport layer comprises an organic layer and inorganic nanostructures,
wherein the emission layer of the first electroluminescent device is configured to emit a first light having a first peak wavelength, and
wherein the emission layer of the second electroluminescent device is configured to emit a second light having a second peak wavelength that is different from the first peak wavelength.

### Claim 12 (depends on 11)

The display device of claim 11, wherein the inorganic nanostructures are disposed within the organic layer or on the organic layer.

### Claim 13 (depends on 11)

The display device of claim 11, wherein the luminescent nanostructures are separated from the inorganic nanostructures by the organic layer.

### Claim 14 (depends on 11)

The display device of claim 11, wherein the organic layer comprises an organic material with two or more phosphonic oxide functional groups (P═O).

### Claim 15 (depends on 11)

The display device of claim 11, wherein an organic material of the organic layer and an inorganic material of the inorganic nanostructures are soluble in a common organic solvent.