Quantum Dot Polymer Composite for Thermal Stability

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Solution Overview

Problem

Quantum dots used in electronic devices face stability issues due to external environments such as air, moisture, and heat, which can deteriorate their luminescent properties during mixing with polymer matrices and heat treatment processes.

Innovation Solution

A composition comprising quantum dots, a monomer combination with thiol groups and carbon-carbon double bonds, and additives like cyclosiloxane compounds, (meth)acrylate salts, and dithiocarbamate salts is used to form a quantum dot polymer composite, providing enhanced stability and a crosslinked structure that protects the quantum dots from environmental degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If quantum dots are mixed with polymer matrices and subjected to heat treatment, then the composite material is formed, but the luminescent properties of quantum dots deteriorate due to external environments such as air, moisture, and heat

Engineering Contradiction:

Improvestability of quantum dotsVSAvoidluminescent properties

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent uses a shell material as an intermediary layer between the quantum dot core and the external environment. This shell comprises a first compound with a first ligand and a second compound with a second ligand, creating a protective barrier that mediates the interaction between quantum dots and environmental factors such as air, moisture, and heat, thereby preventing deterioration of luminescent properties while maintaining composite formation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If high-temperature treatment is applied to the quantum dot polymer composite, then the processing is completed, but the quantum dot performance deteriorates

Engineering Contradiction:

Improveprocessing capabilityVSAvoidquantum dot performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies beforehand cushioning by forming a protective shell structure around quantum dots before they undergo high-temperature treatment. This shell, composed of compounds with specific ligands, provides thermal protection in advance, cushioning the quantum dots against the harmful effects of high-temperature processing and preventing performance deterioration during manufacturing.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Productivity

If the quantum dots are exposed to air and moisture during composite preparation, then the composite is formed, but the quantum dots undergo environmental degradation

Engineering Contradiction:

Improvecomposite formation efficiencyVSAvoidenvironmental degradation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent employs ligands as intermediary molecules that shield quantum dots from harmful environmental factors. The first ligand in the shell's first compound and the second ligand in the shell's second compound act as intermediaries that prevent direct contact between quantum dots and air or moisture, enabling composite formation to proceed efficiently without environmental degradation.

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 quantum dot polymer composite exhibits improved thermal and chemical stability, maintaining luminous properties even after high-temperature treatments, preventing the deterioration of quantum dot performance in electronic devices.

Implementation Method 1

a monomer combination including a first monomer having at least two thiol groups at its end terminals and a second monomer having at least two carbon-carbon double bonds at its end terminals

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Implementation Method 2

an additive, wherein the additive includes a cyclosiloxane compound having a reactive moiety, a (meth)acrylate salt of a polyvalent metal, a dithiocarbamate salt of a polyvalent metal, or a combination thereof, and wherein the reactive moiety includes a carbon-carbon double bond, a thiol group, or a combination thereof

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Data Source

PatentUS10689511B2Compositions, composites prepared therefrom, and electronic devices including the same

Publication Date: 2020.06.23 SAMSUNG ELECTRONICS CO LTD

AI summary

A composition including: a plurality of quantum dots; a monomer combination including a first monomer having at least two thiol groups at terminal ends of the first monomer and a second monomer having at least two carbon-carbon double bonds at terminal ends of the second monomer; and an additive, a composite prepared therefrom, and an electronic device including same are disclosed. The additive includes a cyclosiloxane compound having a reactive moiety, a (meth)acrylate salt of a polyvalent metal, and a dithiocarbamate salt of a polyvalent metal, or a combination thereof, and wherein the reactive moiety includes a carbon-carbon double bond, a thiol group, or a combination thereof.