Curable Composition Surface-Modified Quantum Dots Inkjet Viscosity
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Solution Overview
Problem
Current quantum dot ink compositions face challenges in achieving high light efficiency due to surface characteristics that limit dispersion in solvents, leading to viscosity issues and nozzle clogging, and existing solvent-free compositions struggle with optical characteristics and processability.
Innovation Solution
A curable composition incorporating surface-modified quantum dots with specific functional groups and a polymerizable compound, along with optional additives like light diffusing agents and polymerization initiators, to enhance light resistance and optical properties while maintaining suitable viscosity for ink-jetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If quantum dots are added to increase light efficiency, then light efficiency is improved, but viscosity increases beyond the range suitable for ink-jetting
Solution Approach 1:
The patent changes the chemical parameters of the quantum dot surface by introducing specific functional groups (carboxyl, hydroxyl, or amine groups) that enable polar interactions with the binder and curable monomer. This surface modification allows quantum dots to be dispersed in polar systems without requiring additional solvent to control viscosity, thus achieving high light efficiency while maintaining ink-jetting processability.
2Ease of operation
If solvent is added to control viscosity, then viscosity is improved for ink-jetting, but nozzle drying and nozzle clogging worsen
Solution Approach 1:
The patent extracts the solvent component from the composition entirely, creating a solvent-free system. Instead of using solvent to control viscosity, the invention relies on the polar interactions between the surface-modified quantum dots and the binder/curable monomer mixture to achieve appropriate viscosity for ink-jetting, thereby eliminating nozzle drying and clogging issues.
Solution Approach 2:
The patent creates a composite material system where surface-modified quantum dots are dispersed in a mixture of binder and curable monomer. The polar nature of this composite mixture enables it to interact with the functional groups on quantum dot surfaces, providing both the necessary viscosity control and eliminating the need for solvent that would cause nozzle problems.
3Use of energy by moving object
If quantum dots are dispersed in polar system with binder and curable monomer, then light efficiency is improved, but dispersion becomes difficult due to surface characteristics
Solution Approach 1:
The patent changes the surface chemical parameters of quantum dots by introducing polar functional groups (carboxyl, hydroxyl, or amine groups) that match the polar nature of the binder and curable monomer system. This parameter change enables effective dispersion of quantum dots in the polar medium without aggregation, achieving both high light efficiency and ease of manufacturing.
4Reliability
If solvent-free curable composition is used, then nozzle drying and clogging are reduced, but optical characteristics worsen
Solution Approach 1:
The patent changes the surface parameters of quantum dots by introducing specific functional groups that enhance their compatibility with the binder and curable monomer in a solvent-free system. This surface modification ensures proper dispersion and optical performance of quantum dots without solvent, maintaining both reliability (no nozzle issues) and optical characteristics (high light efficiency).
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 light retention and efficiency, improved light resistance, and suitable processability, enabling effective use in display devices with micro LED light sources.
Implementation Method 1
a polymerizable compound
Data Source
AI summary
A curable composition including surface-modified quantum dots and a polymerizable compound is provided. A cured layer produced using the curable composition, and display device including the cured layer are also provided.