# US 12,193,250 B2 · Light emitting element and display device including an electron transport layer containing at least one of RH and IR

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- Number: US 12,193,250 B2
- Document ID: US12193250B2
- Status: Granted
- Kind: B2
- Application number: 17/612,435
- Filed: 2019-05-31
- Published: 2022-07-14
- Granted: 2025-01-07
- Earliest claimed: 2019-05-31
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Yoshihiro Ueta
- Web page: https://patentgrep.com/patent/US12193250B2

## CPC

- H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots
- H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces
- 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 50/16: Electron transporting layers
- 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 a positive electrode, a negative electrode, a quantum dot layer provided between the positive electrode and the negative electrode and including quantum dots, and a first electron transport layer provided in contact with the quantum dot layer between the quantum dot layer and the negative electrode and containing a compound having a composition of ZnMO, constituent elements M in the composition being an element of at least one of Co, Rh, and Ir.

## Claims

### Claim 1

A light-emitting element comprising:
a positive electrode;
a negative electrode;
a quantum dot layer provided between the positive electrode and the negative electrode and including quantum dots; and
a first electron transport layer provided to be in contact with the quantum dot layer and between the quantum dot layer and the negative electrode and containing a compound formed of Zn, O, and constituent elements M, the constituent elements M including two or more elements of Co, Rh, and Ir.