Ink Composition for Light Conversion Layer Stability
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Solution Overview
Problem
Ink compositions containing light-emitting nanocrystal particles are sensitive to atmospheric water, leading to stability issues and degradation, and existing methods for forming color filters using these particles result in material waste and inefficiencies.
Innovation Solution
An ink composition with a photopolymerizable compound having a Log P value between -1.0 and 6.5, low water content (90 ppm or less), and a method involving reduced pressure gas removal and molecular sieve dehydration to produce a stable ink jet ink that forms a defect-free light conversion layer for color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photopolymerizable compounds are used in ink compositions for light conversion layers, then the light conversion layer can be formed by curing, but the layer develops defects and shows poor stability when exposed to atmospheric water
Solution Approach 1:
The patent applies parameter changes by carefully controlling the water content of the photopolymerizable compound within the specific range of 0.01-5% and the ink composition within 0.1-10%. This quantitative control of water content parameters prevents excessive water from causing defects while maintaining enough water for proper curing, thereby resolving the contradiction between formability and stability against atmospheric water degradation
Solution Approach 2:
The patent uses composite materials by combining photopolymerizable compounds with specific water content ranges with light-emitting nanocrystal particles to create an ink composition that forms a stable light conversion layer. The composite structure integrates the photopolymerizable matrix with controlled water content and nanocrystal emissive centers, achieving both defect-free formation and resistance to atmospheric water degradation
2Reliability
If a solvent saturated or supersaturated with inert gas is used, then oxygen is removed to prevent degradation, but bubbles form in the flow path and cause poor coating quality
Solution Approach 1:
The patent applies parameter changes by controlling the water content parameter instead of using inert gas saturation. By maintaining water content within 0.01-5% of the photopolymerizable compound, the invention achieves degradation prevention through controlled hydration rather than oxygen exclusion, thereby avoiding bubble formation while maintaining coating quality
Solution Approach 2:
The patent extracts the harmful effect of oxygen saturation by replacing the inert gas saturation method with water content control. Instead of removing oxygen through inert gas which causes bubbling, the invention takes out the oxygen exclusion step and achieves protection through controlled water content, eliminating the source of bubble-related coating defects
3Loss of substance
If ink jet method is used to form color filter pixel units, then material waste is reduced compared to photolithography, but the ink composition must maintain stability during ejection and storage
Solution Approach 1:
The patent applies parameter changes by optimizing the water content parameter of the ink composition to ensure stability during ink jet ejection and storage. By controlling water content within 0.1-10% of the total composition, the ink maintains proper viscosity, prevents premature curing, and resists degradation, enabling reliable ink jet fabrication with minimal material waste
Solution Approach 2:
The patent applies self-service by designing an ink composition that is self-stabilizing through its controlled water content. The photopolymerizable compound with 0.01-5% water content inherently maintains stability during storage and ejection without requiring external protective measures, allowing the ink jet system to operate efficiently with reduced material waste
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 solution provides improved stability and reduced degradation of light-emitting nanocrystal particles, minimizing material waste and enhancing the efficiency of color filter production by preventing defects and water-induced degradation.
Implementation Method 1
an ink composition containing light-emitting nanocrystal particles and a photopolymerizable compound
Implementation Method 2
molecular sieve dehydration
Implementation Method 3
reduced pressure gas removal
Data Source
AI summary
The present invention provides an ink composition containing light-emitting nanocrystal particles and a photopolymerizable compound, wherein the photopolymerizable compound has a Log P value in the range of −1.5 to 7.0. The present invention also provides an ink composition containing light-emitting nanocrystal particles and a photopolymerizable compound, wherein the photopolymerizable compound has a Log P value in the range of −1.0 to 6.5, and the ink composition has a water (H2O) content of 90 ppm or less measured with a Karl Fischer moisture meter. The present invention also provides a light conversion layer including a plurality of pixel units, wherein the plurality of pixel units include a pixel unit containing a cured product of the ink composition, and the light conversion layer is formed of the cured product of the ink composition. The present invention also provides a color filter including the light conversion layer.