Ink Composition for Color Conversion Layers with Reduced Shrinkage
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Solution Overview
Problem
Current inkjet printing methods for color conversion layers in light-emitting devices face challenges with adhesion force, cure shrinkage, and manufacturing costs, particularly in achieving high color purity for red, green, and blue light emission.
Innovation Solution
An ink composition incorporating quantum dots with ligands, epoxy group-containing monomers, oxetane group-containing monomers, and vinyl group-containing compounds, which form a film with improved adhesion and reduced cure shrinkage, suitable for use in inkjet printing to create color conversion layers with enhanced light-emitting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional inkjet printing methods are used to form color conversion layers, then the manufacturing process is simple, but the adhesion force is insufficient and cure shrinkage is high
Solution Approach 1:
The patent uses a composite monomer system comprising epoxy group-containing monomers, oxetane group-containing monomers, and vinyl group-containing compounds. This multi-component monomer composition works synergistically to provide both strong adhesion to substrates and reduced cure shrinkage, resolving the contradiction between adhesion force and cure shrinkage by combining materials with complementary properties.
Solution Approach 2:
The patent modifies the chemical composition parameters of the ink material by selecting specific monomers with appropriate functional groups (epoxy, oxetane, vinyl) and adjusting their ratios. These parameter changes enable the curing process to achieve both high adhesion and minimal shrinkage, transforming the material properties to simultaneously satisfy both requirements.
2Ease of manufacture
If conventional ink materials are used, then the formulation is simple, but the manufacturing cost is high
Solution Approach 1:
The patent adjusts the compositional parameters of the ink formulation to use cost-effective monomer combinations that maintain performance while reducing material costs. By optimizing the ratios of epoxy, oxetane, and vinyl monomers, the formulation achieves desirable adhesion and shrinkage properties without requiring expensive specialized materials, thereby reducing manufacturing cost.
3Illumination intensity
If color conversion layers are formed with conventional materials, then the basic color conversion function is achieved, but the color purity is insufficient
Solution Approach 1:
The patent modifies the optical and chemical parameters of the ink material by selecting monomers with appropriate refractive indices and curing characteristics. These parameter changes enhance the color purity of emitted light while maintaining emission efficiency, as the optimized monomer composition improves light extraction and reduces wavelength mixing without compromising the quantum dot luminescence properties.
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 ink composition enhances adhesion, reduces film shrinkage, and lowers manufacturing costs, resulting in improved color purity and efficiency for red, green, and blue light emission in light-emitting devices.
Implementation Method 1
a color conversion layer includes a color-converting luminescent material that absorbs light of a specific wavelength and converts that wavelength of light to a different wavelength
Implementation Method 2
a first monomer including one or more epoxy groups, a second monomer including one or more oxetane groups, and a vinyl group-containing compound including one or more vinyl groups
Data Source
AI summary
An ink composition including: a quantum dot including one or more ligands on a surface of the quantum dot; a first monomer including one or more epoxy groups; a second monomer including one or more oxetane groups; and a vinyl group-containing compound including one or more vinyl groups, wherein the one or more ligands include one or more polar moieties. Also provided is an electronic apparatus including a film formed using the ink composition, and a light emitting device.