Solventless Quantum Dot Composition for Inkjet Printing
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Solution Overview
Problem
Conventional quantum dot compositions for color filters require solvents to achieve low viscosity, which limits film thickness and adhesion, and raises environmental concerns, while solvent-free compositions face challenges in achieving low viscosity and high optical properties suitable for inkjet printing.
Innovation Solution
A solventless quantum dot composition is developed, incorporating surface-modified quantum dots with a first ligand represented by Chemical Formula 1 and a second ligand of 3 to 40 carbon atoms containing a carboxylic group, combined with a photopolymerizable monomer, to enhance compatibility and optical properties, allowing for low viscosity and excellent storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If solvents are included in quantum dot composition to achieve low viscosity, then viscosity is reduced and inkjet printability is improved, but film thickness control becomes difficult and environmental pollution increases
Solution Approach 1:
The patent removes solvents from the quantum dot composition entirely, extracting the harmful element that caused the contradiction. The solvent-free formulation achieves low viscosity through optimized quantum dot surface modification with ligands, eliminating the need for solvents while maintaining inkjet printability and improving film thickness control.
Solution Approach 2:
The patent changes the chemical composition parameters by using specifically engineered ligands on quantum dot surfaces that provide sufficient surface coverage and steric stabilization without requiring solvents. This parameter change in surface modification chemistry enables the composition to achieve low viscosity and good flow properties in a solvent-free state.
2Ease of operation
If solvents are included in quantum dot composition to achieve low viscosity, then inkjet printability is improved, but environmental pollution and safety concerns increase
Solution Approach 1:
The patent converts the potential harm of solvents into a benefit by using the quantum dot surface ligands themselves to provide the necessary flow and dispersion properties. The ligands that were originally just for surface modification now serve the dual function of stabilization and viscosity control, eliminating harmful solvents while maintaining inkjet printability.
3Object-generated harmful factors
If quantum dots are surface-modified with ligands to achieve solventless composition, then environmental safety is improved and storage stability is enhanced, but achieving low viscosity becomes more difficult
Solution Approach 1:
The patent uses composite surface modification with multiple types of ligands on quantum dot surfaces - combining short-chain ligands for close packing and steric stabilization with longer-chain ligands for surface coverage. This composite ligand system creates a synergistic effect that reduces interparticle attraction and lowers viscosity while maintaining environmental safety.
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 solventless quantum dot composition achieves low viscosity, excellent optical properties, and improved storage stability, enabling its use in inkjet printing and the production of high-performance cured films, color filters, and display devices.
Implementation Method 1
a photopolymerizable monomer
Data Source
AI summary
A quantum dot composition, a preparation method therefor, and a cured film, a color filter and a display device that comprise the same are described. Specifically, a solventless quantum dot composition comprises quantum dots, which are surface-treated with two types of ligands. As a result, the quantum dot composition exhibits low viscosity, excellent optical properties, and high storage stability.