Quantum Dot Ink Composition Radical Quenching Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing quantum dot ink compositions face challenges in achieving high luminescence efficiency and storage stability due to radical-induced quenching phenomena during photo-curing, and they often contain thiol compounds that are unpleasant and harmful.

Innovation Solution

A quantum dot ink composition is developed that includes a thiol compound in specific amounts (0.1 to 10 parts by weight based on 100 parts by weight of the composition) along with photopolymerizable monomers, photopolymerization initiators, scatterers, and quantum dots, which suppresses radical-induced quenching and enhances curing efficiency and storage stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thiol compounds are used in quantum dot ink composition to suppress radical-induced quenching, then luminescence efficiency is improved, but unpleasant and harmful effects increase

Engineering Contradiction:

Improveluminescence efficiencyVSAvoidunpleasant and harmful effects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by precisely controlling the amount of thiol compound within 0.1 to 10 parts by weight based on 100 parts by weight of the quantum dot ink composition. This quantitative parameter optimization allows the composition to achieve sufficient radical suppression for high luminescence efficiency while minimizing the unpleasant odor and harmful effects associated with excessive thiol compound content.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If photopolymerization is used to cure the quantum dot ink composition, then processing efficiency is improved, but radical-induced quenching occurs reducing luminescence efficiency

Engineering Contradiction:

Improvecuring efficiencyVSAvoidluminescence efficiency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent uses thiol compounds as intermediary substances that react with radicals generated during photopolymerization. The thiol compounds act as radical scavengers, intercepting the radicals before they can quench the quantum dots, thereby enabling efficient photopolymerization curing while protecting luminescence efficiency through this intermediary protective mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful radicals generated during photopolymerization into beneficial protective action. By introducing thiol compounds that preferentially react with these radicals, the harmful quenching effect is transformed into a protective mechanism where the radicals are consumed by the thiol compound instead of damaging the quantum dots, thus benefiting from the photopolymerization process without suffering its harmful side effects.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Duration of action of moving object

If quantum dot ink composition is stored for extended periods, then processing time is flexible, but composition may cure during storage reducing stability

Engineering Contradiction:

Improvestorage durationVSAvoidstorage stability

Core Design Contradiction:

Duration of action of moving objectVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary action by incorporating thiol compounds into the quantum dot ink composition before storage. These thiol compounds are pre-positioned to scavenge any radicals that may form during storage, preventing premature curing. This preliminary protective measure ensures the composition remains stable and uncured during extended storage periods, providing processing flexibility without sacrificing composition stability.

Inventive Principle:

Principle #10Preliminary action

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 power-conversion efficiency, improved light curing rates, and excellent storage stability without being cured during storage or processing, while also minimizing the unpleasant and harmful effects of thiol compounds.

Implementation Method 1

a photopolymerizable monomer, a photopolymerization initiator

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

A quantum dot is a nanocrystal of a semiconductor material and is a material exhibiting a quantum confinement effect. When a quantum dot receives light from an excitation source and reaches an energy excitation state, the quantum dot autonomously emits energy (e.g., light) according to a corresponding energy band gap.

Methodology Applied

Scientific EffectQuantum confinement effect:

Implementation Method 3

which suppresses radical-induced quenching and enhances curing efficiency and storage stability

Methodology Applied

Scientific EffectRadical scavenging:

Data Source

PatentUS20250066634A1Quantum dot ink composition, apparatus using the same, and light-emitting device using the same

Publication Date: 2025.02.27 SAMSUNG DISPLAY CO LTD

AI summary

A quantum dot ink composition includes a thiol compound, a photopolymerizable monomer, a photopolymerization initiator, a scatterer, and quantum dots. An amount of the thiol compound is greater than or equal to about 0.1 parts by weight and less than 10 parts by weight based on 100 parts by weight of the quantum dot ink composition. An apparatus is formed utilizing the quantum dot ink composition, and a light-emitting device is formed utilizing the quantum dot ink composition.