Quantum Dot Ink Composition for Low-Shrinkage Color Conversion Films
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Solution Overview
Problem
Existing inkjet printing methods for forming color conversion layers in light-emitting devices face challenges with adhesion force, curing shrinkage, and high manufacturing costs, particularly in achieving high color purity and precision in display apparatuses.
Innovation Solution
An ink composition comprising quantum dots with ligands, epoxy-group monomers, and oxetane-group monomers, which form films through ring-opening polymerization, enhancing adhesion and reducing shrinkage while maintaining low solvent content for precise film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional inkjet printing methods are used to form color conversion layers, then manufacturing process is simple, but adhesion force is insufficient and curing shrinkage is high
Solution Approach 1:
The patent uses a composite binder system comprising both epoxy groups and oxetane groups in the ink composition. This composite material approach allows the formulation to achieve superior adhesion force through the synergistic effects of both functional groups while maintaining compatibility with quantum dots and other ink components, thus resolving the contradiction between improved adhesion and formulation complexity.
Solution Approach 2:
The patent modifies the chemical parameters of the binder by incorporating specific functional groups (epoxy and oxetane) with defined reactivity and crosslinking characteristics. This parameter change enables the ink composition to achieve high adhesion force and controlled curing shrinkage without requiring overly complex formulation processes, thereby resolving the technical contradiction.
2Manufacturing precision
If conventional curing methods are used, then manufacturing cost is lower, but curing shrinkage increases
Solution Approach 1:
The patent changes the curing mechanism parameters by utilizing ring-opening polymerization of oxetane groups alongside epoxy curing. This parameter change in the chemical reaction mechanism reduces curing shrinkage significantly compared to conventional single-system curing, while the reaction still proceeds under standard manufacturing conditions, thus achieving improved precision without proportionally increasing cost.
Solution Approach 2:
The dual-functional binder system (epoxy + oxetane) acts as a composite curing material that combines the advantages of both chemical systems. The epoxy provides strong crosslinking while the oxetane contributes to reduced shrinkage through its ring-opening mechanism. This composite approach achieves low curing shrinkage with manageable manufacturing cost by leveraging the complementary properties of both material systems.
3Manufacturing precision
If high solvent content is used in ink composition, then ease of application is improved, but film formation precision decreases
Solution Approach 1:
The patent optimizes the solvent content parameter to a specific range that balances application ease with film formation precision. By controlling solvent concentration and utilizing the reactivity of epoxy and oxetane groups, the formulation achieves proper flow and leveling during application while minimizing excessive spreading and ensuring precise film thickness control, thus resolving the contradiction between ease of application and film precision.
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 improves adhesion force, reduces curing shrinkage, and lowers manufacturing costs, enabling high color purity and precise film formation in display apparatuses.
Implementation Method 1
a first monomer including one or more epoxy groups, and a second monomer including one or more oxetane groups
Data Source
AI summary
An ink composition includes: a quantum dot including one or more ligands on a surface thereof; a first monomer including one or more epoxy groups; and a second monomer including one or more oxetane groups, wherein the one or more ligands include one or more polar moieties. An electronic apparatus includes a film formed utilizing the ink composition.