Quantum Dot Curable Composition for Low-Reflectance Color Filters
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Solution Overview
Problem
Existing quantum dot compositions face challenges in achieving high light efficiency and reducing reflectance due to limitations in solvent choice, viscosity issues, and trade-offs between optical characteristics and reflectance, particularly in solvent-free formulations.
Innovation Solution
A curable composition incorporating a high refractive index and high viscosity polymerizable compound, such as a thioacrylate-based monomer, is used to improve optical characteristics and reduce reflectance, with a balanced ratio of quantum dots and polymerizable compounds, along with optional additives like light diffusing agents and polymerization initiators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the content of inorganic materials is increased to improve optical characteristics, then light efficiency is improved, but reflectance increases
Solution Approach 1:
The patent uses a composite material system consisting of quantum dots (inorganic) dispersed in a polymerizable compound (organic). This composite approach allows the quantum dots to provide high light efficiency while the polymerizable compound matrix controls reflectance, resolving the trade-off between optical characteristics and reflectance that plagues solvent-free formulations with excessive inorganic content.
Solution Approach 2:
The patent changes the physical and chemical parameters of the composition by using a polymerizable compound with specific refractive index and viscosity characteristics. This parameter optimization allows achieving high quantum dot content (20 wt% or more) while maintaining appropriate reflectance levels, unlike conventional approaches that simply increase inorganic material content.
2Illumination intensity
If quantum dot content is increased to improve light efficiency, then optical characteristics are improved, but viscosity exceeds ink-jetting range
Solution Approach 1:
The patent optimizes the viscosity parameter by selecting a polymerizable compound with appropriate molecular weight and structure. This allows incorporating 20 wt% or more quantum dots to achieve high light efficiency while maintaining viscosity within the ink-jetting processable range, avoiding the need to reduce quantum dot content.
Solution Approach 2:
The polymerizable compound acts as an intermediary medium that enables high quantum dot content dispersion while maintaining processable viscosity. Unlike conventional solvents that require high volatility and create drying issues, the polymerizable compound provides a balanced system where quantum dots are well-dispersed and the composition remains ink-jet compatible.
3Ease of manufacture
If solvent content is increased to achieve ink-jetting viscosity, then processability is improved, but nozzle drying and clogging worsen
Solution Approach 1:
The patent extracts the volatile solvent component from the composition and replaces it with a non-volatile or low-volatility polymerizable compound. This extraction eliminates the nozzle drying and clogging problems associated with high solvent content while maintaining the necessary viscosity for ink-jetting through careful selection of the polymerizable compound.
Solution Approach 2:
Instead of using volatile solvents that evaporate quickly and cause nozzle issues, the patent employs a polymerizable compound that remains stable in the inkjet system. The compound serves as a temporary carrier during printing that can be cured in place, avoiding the need for rapid evaporation and preventing nozzle drying and clogging.
4Illumination intensity
If quantum dot content is increased beyond 20 wt%, then light efficiency improves, but composition becomes incompatible with polar systems
Solution Approach 1:
The patent changes the chemical parameter compatibility by using a polymerizable compound with appropriate polarity and functional groups that can interact with quantum dot surfaces. This allows achieving 20 wt% or more quantum dot content while maintaining compatibility with the binder system, overcoming the limitation of conventional formulations where high quantum dot content causes aggregation and incompatibility.
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 optical characteristics and reduced reflectance in quantum dot-containing layers, enhancing luminance and light efficiency while maintaining processability and ink-jetting capabilities.
Implementation Method 1
By including a polymerizable compound having high refractive and high viscosity properties, optical characteristics of a curable composition containing quantum dots may be improved
Implementation Method 2
By including a polymerizable compound having high refractive and high viscosity properties, optical characteristics of a curable composition containing quantum dots may be improved while simultaneously or contemporaneously reducing reflectance
Implementation Method 3
a curable composition including (A) quantum dots, and (B) a polymerizable compound
Data Source
AI summary
Examples of the disclosure include a curable composition, a cured layer manufactured including the curable composition, a color filter including the cured layer, and a display device including the cured layer. The curable composition includes quantum dots and a polymerizable compound, wherein the polymerizable compound includes a first polymerizable compound having high refractive and high viscosity characteristics.