Curable Quantum Dot Composition for Display Devices
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Solution Overview
Problem
Current quantum dot ink compositions face limitations in photo efficiency and processability due to hydrophobic surface characteristics, leading to high viscosity and nozzle clogging, and solvent-based compositions suffer from pattern detachment during curing due to low adhesion force and high shrinkage.
Innovation Solution
A solvent-free curable composition incorporating quantum dots and a polymerizable compound with specific chemical structures, along with surface-modified quantum dots, to enhance adhesion force and maintain high photo efficiency, suitable for ink-jetting and display device applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If quantum dots are added to increase photo efficiency, then photo efficiency is improved, but viscosity exceeds the suitable range and processability is compromised
Solution Approach 1:
The patent changes the surface properties of quantum dots through ligand substitution, modifying their hydrophobicity parameter to enable better dispersion in polar solvents. This allows increasing quantum dot content to improve photo efficiency while maintaining viscosity within the suitable range for ink-jetting processes
Solution Approach 2:
The patent introduces a polar solvent as an intermediary medium that facilitates dispersion between hydrophobic quantum dots and the polar binder system. This intermediary enables high quantum dot loading (20 wt% or more) while maintaining acceptable viscosity and processability
2Ease of operation
If solvent is added to lower viscosity for ink-jetting, then viscosity is improved, but nozzle drying, nozzle clogging, and thickness deviation occur
Solution Approach 1:
The patent optimizes the composition parameters by using quantum dots with modified surface properties and controlled size distribution, achieving suitable viscosity without requiring high solvent content. This maintains nozzle performance and prevents drying and clogging issues
Solution Approach 2:
The patent develops a solvent-free or low-solvent composition that replicates the flow characteristics of traditional solvent-based inks through careful selection of quantum dot surface ligands and composition ratios, eliminating the need for high solvent content while maintaining ink-jetting performance
3Use of energy by moving object
If quantum dots are included at high content to improve photo efficiency, then photo efficiency is improved, but pattern detachment occurs due to low adhesion force
Solution Approach 1:
The patent modifies the surface chemistry parameters of quantum dots through ligand substitution with polar groups, enabling strong interaction with polar binders. This allows high quantum dot content (20 wt% or more) to be achieved while maintaining sufficient adhesion force to prevent pattern detachment during curing
Solution Approach 2:
The patent creates a composite system combining quantum dots with modified surface ligands and polar binders, where the interface between components is strengthened through chemical interaction. This composite approach enables high quantum dot loading while maintaining pattern adhesion through the polar-polar interaction between modified quantum dot surfaces and binder
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 photo efficiency and improved adhesion force, reducing pattern lifting and maintaining processability, while preventing detachment during curing, thus enhancing the reliability of the display device.
Implementation Method 1
a polymerizable compound, wherein the polymerizable compound includes a compound represented by Chemical Formula (1)
Implementation Method 2
it is difficult to increase photo efficiency (e.g., luminous efficiency, quantum efficiency, etc.) of the ink
Data Source
AI summary
A curable composition, a cured layer manufactured utilizing the same, and a display device including the cured layer are provided. The curable composition includes (A) a quantum dot; and (B) a polymerizable compound, wherein the polymerizable compound is a compound represented by Chemical Formula 1.In Chemical Formula 1, each substituent is the same as defined in the specification.