Quantum Dot Curable Composition Inkjet Processability
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Solution Overview
Problem
Current quantum dot ink compositions face challenges in achieving low viscosity, high light efficiency, high heat resistance, low out-gas characteristics, and high curing rates due to limitations in dispersibility and processability, particularly in solvent-based and solvent-free systems.
Innovation Solution
A curable composition is developed that includes quantum dots surface-modified with specific surface-modifying materials, such as those represented by Chemical Formulas 1, 2, 3, and 4, in specific weight ratios, along with a polymerizable compound and optional additives like a polymerization initiator, light diffusing agents, and surfactants, to enhance dispersibility, heat resistance, and curing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If quantum dots are dispersed in a solvent-based curable composition to improve dispersibility, then dispersibility is improved, but viscosity increases and light efficiency cannot exceed a certain level
Solution Approach 1:
The patent changes the polarity parameter of the curable composition by selecting specific polymerizable compounds with appropriate polarity to match the quantum dot surface characteristics. This allows quantum dots to be dispersed at high concentrations (20 wt% or more) without excessive viscosity increase, achieving both good dispersibility and high light efficiency
Solution Approach 2:
The patent uses a composite approach by combining quantum dots with a specifically designed curable composition containing polymerizable compounds, photoinitiators, and other additives in optimized ratios. This composite system achieves synergistic effects where the composition supports high quantum dot loading while maintaining processability and high light efficiency
2Productivity
If quantum dots are added to increase light efficiency, then light efficiency is improved, but viscosity exceeds the range capable of ink-jetting
Solution Approach 1:
The patent optimizes the viscosity parameter by carefully selecting polymerizable compounds with appropriate molecular weights, functional groups, and structures. The composition is designed to maintain viscosity within the ink-jetting range (typically 1-1000 cP) even with high quantum dot content, enabling both high light efficiency and good processability
Solution Approach 2:
The patent introduces functional groups with specific local properties (such as hydrophobic or hydrophilic groups) into the polymerizable compound structure. These local functional groups interact with the quantum dot surface to improve dispersibility without significantly increasing overall viscosity, maintaining ink-jetting processability
3Ease of operation
If solvent content is increased to achieve viscosity range for ink-jetting, then viscosity is improved, but nozzle drying and nozzle clogging occur due to solvent volatilization
Solution Approach 1:
The patent extracts or minimizes the solvent component from the composition, using instead a solvent-free or low-solvent curable composition based on polymerizable compounds. This eliminates the harmful volatilization effect that causes nozzle drying and clogging, while maintaining appropriate viscosity through molecular design of the polymerizable compounds
Solution Approach 2:
The patent uses polymerizable compounds as intermediary substances that provide both the necessary viscosity control and the curing function. These compounds act as mediators between the quantum dots and the final cured network, enabling processability without relying on volatile solvents that cause nozzle problems
4Ease of operation
If polymerizable compound content is increased in solvent-free curable composition to lower viscosity, then viscosity is improved, but nozzle drying and single film thickness reduction occur due to volatility
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable compounds to achieve low viscosity without high volatility. By selecting compounds with appropriate molecular weight, functional groups, and structural features, the composition maintains ink-jetting processability while preventing excessive volatilization that would reduce film thickness
Solution Approach 2:
Instead of using volatile solvents or low molecular weight compounds to achieve low viscosity (which causes volatilization problems), the patent inverts the approach by using carefully designed polymerizable compounds with low viscosity but low volatility. This reverses the typical trade-off between viscosity and volatility
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 low viscosity, high light efficiency, high heat resistance, low out-gas characteristics, and rapid curing, improving the overall performance and processability of quantum dot-containing curable compositions.
Implementation Method 1
A curable composition including (A) a quantum dot surface-modified with at least two surface-modifying materials; and (B) a polymerizable compound
Implementation Method 2
a curable composition having a low viscosity, high light efficiency, high heat resistance, low out-gas characteristics, and high curing rate
Data Source
AI summary
Provided are a curable composition including (A) a quantum dot surface-modified with at least two surface-modifying materials; and (B) a polymerizable compound, wherein the surface-modifying material includes a first surface-modifying material and a second surface-modifying material, a cured layer manufactured using the curable composition, a color filter including the cured layer, and a display device including the color filter.