Thiol-Ene Quantum Dot Composition for Stable Ink-Jetting

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing quantum dot compositions face challenges in achieving high photoefficiency, processability, and stability due to limited solvent compatibility and viscosity issues, leading to nozzle clogging and thickness deviations during ink-jetting.

Innovation Solution

A solvent-free curable composition incorporating a product of a thiol-ene reaction between a (meth)acrylate-based monomer and a thiol-based monomer, which includes quantum dots and a polymerizable compound, allowing for low viscosity and excellent dispersibility, thereby forming a stable matrix during UV curing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If quantum dots are dispersed in a solvent-based curable composition to achieve high photoefficiency, then the photoefficiency increases, but the viscosity exceeds the range capable of ink-jetting

Engineering Contradiction:

ImprovephotoefficiencyVSAvoidink-jetting processability

Core Design Contradiction:

Use of energy by moving objectVSEase of operation

Solution Approach 1:

The patent changes the chemical composition parameters by using solvent-free curable monomers and oligomers with specific functional groups that provide both low viscosity and high quantum dot compatibility, enabling ink-jetting at higher quantum dot concentrations without exceeding viscosity limits

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite curable composition combining quantum dots with polymerizable monomers and oligomers that have complementary properties - the organic components provide low viscosity and compatibility while the quantum dots provide high photoefficiency, achieving both goals simultaneously

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If the quantum dot content is increased to improve photoefficiency, then the photoefficiency increases, but the viscosity becomes too high for ink-jetting

Engineering Contradiction:

ImprovephotoefficiencyVSAvoidviscosity control

Core Design Contradiction:

Use of energy by moving objectVSEase of operation

Solution Approach 1:

The patent optimizes the viscosity parameter by selecting curable monomers and oligomers with appropriate molecular weights and functional groups that maintain low viscosity even at high quantum dot contents, enabling ink-jetting processability while maximizing photoefficiency

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If a solvent is added to reduce viscosity for ink-jetting, then the viscosity decreases, but nozzle drying and nozzle clogging occur during ink-jetting

Engineering Contradiction:

ImproveviscosityVSAvoidnozzle stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent extracts and eliminates the solvent component from the composition entirely, using a solvent-free system based on curable monomers and oligomers that provides both low viscosity and nozzle stability, preventing drying and clogging issues

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent creates an inert curable environment using polymerizable monomers that prevent solvent volatilization and nozzle drying, while the curable nature of the composition maintains stability during storage and processing

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

4Ease of operation

If the quantum dot content is reduced to achieve ink-jetting viscosity, then the viscosity becomes acceptable, but photoefficiency decreases

Engineering Contradiction:

Improveink-jetting processabilityVSAvoidphotoefficiency

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent changes the composition parameters by using solvent-free curable monomers and oligomers that enable high quantum dot loading while maintaining ink-jetting viscosity, reversing the traditional trade-off and allowing high photoefficiency with acceptable processability

Inventive Principle:

Principle #35Parameter changes

5Quantity of substance

If ligand substitution is performed to increase quantum dot content, then the quantum dot content increases, but the viscosity limit is reached

Engineering Contradiction:

Improvequantum dot contentVSAvoidviscosity

Core Design Contradiction:

Quantity of substanceVSEase of operation

Solution Approach 1:

The patent changes the chemical parameters by using quantum dots with surface modifications that enhance compatibility with curable monomers, allowing higher quantum dot contents while maintaining low viscosity through molecular-level interactions rather than bulk solvent effects

Inventive Principle:

Principle #35Parameter changes

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 composition achieves high dispersibility and stability of quantum dots, preventing nozzle clogging and ensuring uniform film formation with improved optical properties and processability.

Implementation Method 1

the polymerizable compound includes a product of a thiol-ene reaction between a (meth)acrylate-based monomer and a thiol-based monomer

Methodology Applied

Scientific EffectThiol-ene reaction: Chemical Bonding

Implementation Method 2

forming a stable matrix during UV curing

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentUS20250326876A1Curable composition, cured layer manufactured using same composition, color filter including same cured layer, and display device including same color filter

Publication Date: 2025.10.23 SAMSUNG SDI CO LTD

AI summary

Provided are a curable composition, a cured layer manufactured using the curable composition, a color filter including the cured layer, and a display device including the color filter, the curable composition including (A) a quantum dots; and (B) a polymerizable compound, wherein the polymerizable compound includes a product of a thiol-ene reaction between a (meth)acrylate-based monomer and a thiol-based monomer.