Solvent-Free Quantum Dot Ink Viscosity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current quantum dot ink compositions face challenges in achieving low viscosity while maintaining high light efficiency and processability, particularly in solvent-free systems, due to issues with nozzle clogging and thickness variations during ink-jetting.
Innovation Solution
A curable composition is developed that includes surface-modified quantum dots with a specific surface-modifying material, combined with a polymerizable compound, to achieve low viscosity and reduced out-gas characteristics, enabling effective ink-jetting and light retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are dispersed in a solvent-free curable composition with excessive polymerizable compound, then light efficiency is improved, but viscosity becomes too high for ink-jetting processability
Solution Approach 1:
The patent modifies the molecular weight and chemical structure parameters of the polymerizable compound. Specifically, it uses polymerizable compounds with molecular weights of 1,000-5,000 g/mol and introduces hydroxy groups into the molecular structure. These parameter changes reduce the viscosity of the solvent-free curable composition while maintaining high quantum dot content (20-80 wt%), enabling both high light efficiency and ink-jetting processability.
2Ease of manufacture
If quantum dots are dispersed in a solvent-based curable composition, then viscosity is reduced for ink-jetting, but nozzle drying and clogging occur due to solvent volatilization
Solution Approach 1:
The patent extracts and eliminates the solvent component from the curable composition system. By developing a truly solvent-free formulation using polymerizable compounds as the continuous phase, the invention removes the source of volatilization that causes nozzle drying and clogging, while maintaining ink-jetting processability through careful selection of polymerizable compound molecular weight and structure.
Solution Approach 2:
The patent introduces polymerizable compounds with hydroxy groups as intermediary substances that mediate between the hydrophobic quantum dot surface and the polymerization matrix. These compounds act as surfactants and reaction mediators, enabling stable dispersion of quantum dots without requiring volatile solvents, thus preventing nozzle issues while maintaining processability.
3Stability of the object's composition
If quantum dots are surface-modified with conventional materials, then dispersibility is improved, but out-gas generation increases during curing
Solution Approach 1:
The patent changes the molecular weight parameter and chemical structure of the surface-modifying material. By using materials with molecular weights of 1,000-5,000 g/mol and specific hydroxy-containing structures, the invention reduces out-gas generation during curing while maintaining effective dispersibility of quantum dots in the polymerizable compound matrix.
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 maintains low viscosity and reduces out-gas generation, enhancing the dispersibility and photocurability of quantum dots, thereby improving light efficiency and processability in quantum dot-containing curable compositions.
Implementation Method 1
A curable composition including (A) a quantum dot surface-modified with a surface-modifying material represented by Chemical Formula 1; and (B) a polymerizable compound
Implementation Method 2
a polymerizable compound
Data Source
AI summary
Provided are a curable composition including (A) a quantum dot surface-modified with a surface-modifying material; and (B) a polymerizable compound, a cured layer manufactured using the curable composition, a color filter including the cured layer, and a display device including the color filter.