Quantum Dot Light Emitting Element With Metal Nanoparticle Transport Regions

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Solution Overview

Problem

Existing quantum dot light emitting elements face challenges in achieving high luminous efficiency and service life due to inefficiencies in the injection and transport of holes and electrons.

Innovation Solution

A light emitting element is designed with a structure that includes a first electrode, a second electrode, an emission layer with quantum dots, a hole transport region, and an electron transport region, where at least one of the hole transport or electron transport regions includes metal nanoparticles with a core of metal oxide and ligands bonded to the core, including an alkoxy group derived from an oxygen-containing compound.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional quantum dot light emitting elements are used, then the structure is simple, but the luminous efficiency and service life are insufficient due to poor charge transport and injection characteristics

Engineering Contradiction:

Improveservice lifeVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite materials by incorporating metal nanoparticles with metal oxide cores and alkoxy-group-containing ligands into the transport regions. These composite nanoparticles improve charge transport and injection characteristics, thereby enhancing luminous efficiency and service life without significantly complicating the overall device structure

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by specifically modifying the transport regions (electron transport region or hole transport region) with metal nanoparticles rather than the entire device. This targeted approach improves charge transport characteristics where needed while maintaining structural simplicity in other areas

Inventive Principle:

Principle #3Local quality

2Productivity

If conventional quantum dot light emitting elements are used, then the manufacturing process is simple, but the luminous efficiency is insufficient due to inefficiencies in hole and electron injection and transport

Engineering Contradiction:

Improveluminous efficiencyVSAvoidmanufacturing complexity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent changes material parameters by introducing metal nanoparticles with specific properties (metal oxide core, alkoxy group ligands) into the transport regions. This parameter change improves charge transport efficiency and luminous efficiency while the nanoparticles can be incorporated using existing manufacturing techniques, minimizing additional complexity

Inventive Principle:

Principle #35Parameter changes

3Reliability

If metal nanoparticles with alkoxy group ligands are incorporated into transport regions, then charge transport and injection characteristics improve, but the device structure becomes more complex

Engineering Contradiction:

Improveluminous efficiencyVSAvoidtransport region complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses metal nanoparticles as discrete, replaceable units within the transport regions. These nanoparticles function as independent charge transport entities that can be incorporated into existing layer structures without requiring fundamental redesign, thus improving performance with minimal structural complexity increase

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The proposed solution enhances the luminous efficiency and service life of the light emitting element by improving charge transport and injection characteristics, resulting in lower driving voltage and higher brightness maintenance over time.

Implementation Method 1

at least one of the hole transport region and the electron transport region includes metal nanoparticles

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

Implementation Method 2

electrons move to the emission layer through an electron transport region

Methodology Applied

Scientific EffectElectron transport: Conduction (electrical)

Implementation Method 3

a quantum dot light emitting element that includes quantum dots in an emission layer has high color purity and luminous efficiency

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250133950A1Light emitting element, method for manufacturing the light emitting element, and display device comprising the light emitting element

Publication Date: 2025.04.24 SAMSUNG DISPLAY CO LTD

AI summary

Embodiments provide a light emitting element that includes a first electrode, a second electrode disposed on the first electrode, an emission layer disposed between the first electrode and the second electrode and including quantum dots, a hole transport region disposed between the first electrode and the second electrode, and an electron transport region disposed between the first electrode and the second electrode, wherein the emission layer is disposed between the hole transport region and the electron transport region. At least one of the hole transport region and the electron transport region includes metal nanoparticles. The metal nanoparticles include a core containing a metal oxide, and a ligand bonded to the core, wherein the ligand includes an alkoxy group. The alkoxy group is derived from an oxygen-containing compound represented by Formula 1, which is explained in the specification.