Organic-Ligand Metal Oxide Nanoparticle Complex for Emission-Layer Stability

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Solution Overview

Problem

Existing light-emitting devices face efficiency and lifespan issues due to mixing of metal oxide nanoparticles with the emission layer, leading to decreased performance.

Innovation Solution

A metal oxide nanoparticle complex with an organic ligand bonded to its surface is used to form an electron transport layer, where the ligand is cross-linked to form a polymer, preventing mixing with the emission layer and stabilizing the nanoparticles, thereby enhancing device efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If metal oxide nanoparticles are used in the electron transport layer, then electron transport efficiency is improved, but nanoparticles mix with the emission layer causing device lifespan to decrease

Engineering Contradiction:

Improveelectron transport efficiencyVSAvoiddevice lifespan

Core Design Contradiction:

PowerVSDuration of action of stationary object

Solution Approach 1:

An organic ligand is introduced as an intermediary substance that bonds to the surface of metal oxide nanoparticles. This ligand forms a protective interface between the nanoparticles and the emission layer, preventing direct contact and mixing while maintaining the electron transport function of the nanoparticles.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure by combining metal oxide nanoparticles with organic ligands to form a hybrid electron transport layer. This composite material integrates the high electron mobility of inorganic nanoparticles with the stabilizing and protective properties of organic molecules, preventing nanoparticle aggregation and emission layer contamination.

Inventive Principle:

Principle #40Composite materials

2Productivity

If metal oxide nanoparticles are used to enhance electron transport, then device efficiency is improved, but metal diffusion occurs reducing reliability

Engineering Contradiction:

Improvedevice efficiencyVSAvoidmetal diffusion resistance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The organic ligand serves as a diffusion barrier and intermediary layer that anchors metal oxide nanoparticles in place. This ligand shell prevents metal atoms from diffusing into adjacent layers while allowing the nanoparticles to maintain their electron transport pathways.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The organic ligand forms a flexible molecular shell around each nanoparticle, creating a steric barrier that physically constrains metal diffusion. This thin film-like ligand layer is sufficient to block metal atom migration while being thin enough to maintain electrical functionality.

Inventive Principle:

Principle #30Flexible shells and thin films

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 solution improves the efficiency and lifespan of light-emitting devices by preventing metal diffusion and maintaining the integrity of the electron transport layer.

Implementation Method 1

an organic ligand represented by Formula 1, wherein the organic ligand is bonded to surfaces of the metal oxide nanoparticles

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

the ligand is cross-linked to form a polymer, preventing mixing with the emission layer and stabilizing the nanoparticles

Methodology Applied

Scientific EffectCross-linking:

Data Source

PatentUS20250338765A1Metal oxide nanoparticle complex, and composition, light-emitting device, electronic device, and electronic apparatus including the same

Publication Date: 2025.10.30 SAMSUNG DISPLAY CO LTD

AI summary

Embodiments provide a metal oxide nanoparticle complex, a metal oxide nanoparticle composition including the metal oxide nanoparticle complex, and a light-emitting device produced from the metal oxide nanoparticle composition. The metal oxide nanoparticle complex includes metal oxide nanoparticles and an organic ligand that is bonded to surfaces of the metal oxide nanoparticles. The organic ligand is represented by Formula 1, which is explained in the specification: