Azide Cross-Linked Quantum Dot Material for Longer-Lived OLEDs

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Solution Overview

Problem

Existing organic light-emitting devices (OLEDs) face challenges in improving hole transportability and lifespan.

Innovation Solution

A quantum dot-containing material is surface-modified with an organic group including an azide group and a charge transport group, which is then cross-linked to enhance hole transportability and extend the device's lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If quantum dot-containing material is surface-modified with organic group including azide group and charge transport group, then hole transportability is improved, but device complexity increases

Engineering Contradiction:

Improvehole transportabilityVSAvoidmaterial structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses composite materials by combining quantum dots with organic groups that include both azide groups and charge transport groups. This composite structure allows the material to simultaneously achieve cross-linking capability (for stability and lifespan) and charge transport functionality (for improved hole transportability), while the cross-linked network provides structural organization that manages the complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The organic group is designed with multi-functionality, incorporating both azide groups (for cross-linking) and charge transport groups (for hole transport) within a single molecular structure. This universal design allows one material component to perform multiple functions: surface modification, cross-linking initiation, and charge transport, thereby improving hole transportability without proportionally increasing device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Duration of action of stationary object

If quantum dot-containing material is cross-linked, then lifespan is extended, but manufacturing process complexity increases

Engineering Contradiction:

Improvedevice lifespanVSAvoidmanufacturing process simplicity

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The quantum dot surface is pre-modified with organic groups containing azide groups before device assembly. This preliminary action prepares the material for subsequent cross-linking under UV irradiation during device fabrication, extending lifespan without requiring complex post-manufacturing processing. The cross-linking can be activated in-situ during device formation, simplifying the overall manufacturing workflow.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces traditional thermal cross-linking processes with photo-cross-linking using UV irradiation. This substitution eliminates the need for complex thermal control systems and high-temperature processing equipment, allowing cross-linking to occur under milder conditions during device fabrication, thereby extending material lifespan without significantly increasing manufacturing complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Stability of the object's composition

If organic group with azide group is used for cross-linking, then material stability is improved, but synthesis difficulty increases

Engineering Contradiction:

Improvematerial stabilityVSAvoidsynthesis ease

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent uses precursor molecules as intermediaries in the synthesis process. These precursors contain the necessary functional groups (including azide groups) and can be coupled with quantum dot surfaces through well-established chemistry protocols. The intermediary approach allows for modular synthesis, where the organic groups are first prepared separately and then attached to quantum dots, improving material stability while managing synthesis complexity through standardized intermediate steps.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 cross-linked quantum dot-containing material improves hole mobility and extends the lifespan of OLEDs by reducing intermixing between emission layers and hole transport regions, resulting in more efficient and durable devices.

Implementation Method 1

the organic group may include an azide group and a charge transport group

Methodology Applied

Scientific EffectPhoto-cross-linking: Photopolymerisation

Implementation Method 2

the charge transport group may not be an unsubstituted benzene group

Methodology Applied

Scientific EffectCharge transport: Conduction (electrical)

Data Source

PatentUS12497559B2Quantum dot-containing material comprising an azide group and a charge transport group, method of preparing thereof, cross-linked material thereof, method of preparing cross-linked material, and light-emitting device including cross-linked material

Publication Date: 2025.12.16 SAMSUNG DISPLAY CO LTD

AI summary

Disclosed are a quantum dot-containing material, a method of preparing the quantum dot-containing material, a cross-linked material of the quantum dot-containing material, and a method of preparing the same, and a light-emitting device comprising the quantum dot-containing material. The quantum dot-containing material may include a quantum dot and an organic group chemically bound to a surface of the quantum dot, the organic group may include an azide group and a charge transport group, and the charge transport group may not be an unsubstituted benzene group.