Quantum Dot Ink Composition for Stable Low-Viscosity Printing

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Solution Overview

Problem

Existing compositions face issues with long-term viscosity increase, low compatibility of (meth)acrylate monomers, high vapor pressure, and poor chemical stability, leading to degradation and clogging during inkjet printing of quantum dot inks, requiring improved optical properties and handling.

Innovation Solution

A novel composition comprising (meth)acrylate monomers, light emitting moieties, and specific chemical compounds with functional groups like phosphonate or carboxyl groups to enhance compatibility, viscosity control, and chemical stability, allowing for low-temperature curing and high-resolution printing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional (meth)acrylate monomers are used in quantum dot ink compositions, then the composition can be formulated for inkjet printing, but the composition exhibits long-term viscosity increase and poor chemical stability

Engineering Contradiction:

Improvechemical stabilityVSAvoidlong-term stability

Core Design Contradiction:

Stability of the object's compositionVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical parameters of the (meth)acrylate monomer by introducing specific functional groups (carboxyl, phosphonate, sulfonic acid, or hydroxyl groups) to improve chemical stability and prevent long-term viscosity increase while maintaining inkjet printability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite monomer structure combining (meth)acrylate functionality with additional functional groups (carboxyl, phosphonate, sulfonic acid, or hydroxyl) to achieve both inkjet printing capability and enhanced chemical stability

Inventive Principle:

Principle #40Composite materials

2Reliability

If high loading of semiconducting light emitting nanoparticles is used to improve optical properties, then the ink composition viscosity increases, making it difficult to print

Engineering Contradiction:

Improveoptical propertiesVSAvoidprintability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent modifies the viscosity parameter of the ink composition by incorporating (meth)acrylate monomers with specific functional groups that provide better dispersion and flow characteristics, enabling high nanoparticle loading while maintaining printability

Inventive Principle:

Principle #35Parameter changes

3Area of stationary object

If conventional ink compositions are used for large area printing, then printing can be performed, but vapor pressure causes uniformity issues and clogging

Engineering Contradiction:

Improveprinting areaVSAvoidprinting uniformity

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent changes the vapor pressure parameter of the ink composition by selecting (meth)acrylate monomers with appropriate volatility characteristics, ensuring uniform large-area printing without clogging while maintaining printability

Inventive Principle:

Principle #35Parameter changes

4Productivity

If UV curing is performed under short time and weak conditions to improve productivity, then the film solidity and cross-linking density are insufficient

Engineering Contradiction:

Improvecuring speedVSAvoidfilm solidity

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The patent modifies the reactivity parameters of the (meth)acrylate monomer by incorporating functional groups that enhance UV curing efficiency, allowing fast curing under short time and weak conditions while achieving high cross-linking density and film solidity

Inventive Principle:

Principle #35Parameter changes

5Strength

If high cross-linking density is achieved to improve film solidity, then the formulation complexity increases and compatibility of monomers decreases

Engineering Contradiction:

Improvefilm solidityVSAvoidformulation complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent creates a universal (meth)acrylate monomer platform with different functional groups (carboxyl, phosphonate, sulfonic acid, hydroxyl) that can all achieve high cross-linking density and film solidity through UV curing, simplifying the formulation process while maintaining performance

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 stable, low-viscosity inkjet printing with improved optical properties, chemical resistance, and thermal stability, reducing degradation and clogging, and enabling high-resolution, large-area printing with quantum dots.

Implementation Method 1

a photopolymerization initiator; wherein the (meth)acrylate monomer comprises a photopolymerizable group

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

at least one light emitting moiety

Methodology Applied

Scientific EffectLight emission: Luminescence

Data Source

PatentEP4232518B1composition

Publication Date: 2026.02.18 SAMSUNG ELECTRONICS CO LTD

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AI summary

The present invention relates to a composition comprising at least one light emitting moiety.