Quantum Dot Curable Composition for Inkjetting Without Nozzle Clogging
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Solution Overview
Problem
Existing quantum dot compositions face challenges in achieving high light efficiency, processability, and reliability due to issues with viscosity, nozzle clogging, and insufficient light resistance, particularly in solvent-based and solvent-free formulations.
Innovation Solution
A curable composition incorporating quantum dots with a specific functional group and a polymerizable compound, along with optional additives like dispersants and light diffusing agents, enhances dispersibility and stability, ensuring high light and heat resistance.
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 exceeds the range capable of ink-jetting and processability deteriorates
Solution Approach 1:
A surface-modified quantum dot is used as an intermediary carrier that incorporates both the quantum dot and a polymerizable compound. This intermediary structure allows the quantum dot to be transported in a polymerizable compound-based medium, enabling ink-jetting processability while maintaining high light efficiency through the quantum dot's optical properties.
Solution Approach 2:
The invention creates a composite material system where quantum dots are surface-modified with polymerizable compounds. This composite structure combines the high light efficiency of quantum dots with the processability benefits of polymerizable materials, allowing the composition to be ink-jetted while maintaining optical performance.
2Stability of the object's composition
If solvent is used to improve dispersibility, then quantum dot dispersibility is improved, but nozzle drying and nozzle clogging occur during ink-jetting
Solution Approach 1:
The invention changes the fundamental parameter of the composition from solvent-based to polymerizable compound-based. By using a polymerizable compound as the continuous phase instead of a volatile solvent, the composition maintains quantum dot dispersibility while eliminating the nozzle drying and clogging problems associated with solvent volatilization during ink-jetting.
3Ease of operation
If solvent-free curable composition is used to avoid nozzle clogging, then processability is improved, but optical properties cannot be improved
Solution Approach 1:
The surface-modified quantum dot acts as an intermediary that carries the quantum dot core while providing a polymerizable compound shell. This intermediary structure enables the composition to be solvent-free and ink-jettable while maintaining excellent optical properties through the quantum dot core's light-emitting characteristics.
4Use of energy by moving object
If high quantum dot concentration is used to increase light efficiency, then light efficiency is improved, but viscosity increases and processability deteriorates
Solution Approach 1:
The polymerizable compound serves as an intermediary medium that disperses quantum dots at high concentrations without causing excessive viscosity. The polymerizable compound-based continuous phase provides a suitable matrix for high quantum dot loading while maintaining composition fluidity suitable for ink-jetting processes.
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 improved light efficiency, processability, and reliability by maintaining low viscosity and preventing nozzle clogging, while ensuring excellent optical properties and durability under strong blue light exposure.
Implementation Method 1
a curable composition including (A) a quantum dot including a functional group represented by Chemical Formula 1; and (B) a polymerizable compound
Data Source
AI summary
Provided are a curable composition, a cured layer produced using the curable composition, and a display device including the cured layer, the curable composition including (A) a quantum dot including a functional group represented by Chemical Formula 1; and (B) a polymerizable compound. In Chemical Formula 1, each substituent is the same as defined in the detailed description.