Photocurable Inkjet Composition for High-Loading Light Emitting Moieties
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Solution Overview
Problem
Existing compositions for light-emitting moieties face challenges in achieving homogeneous dispersion, high viscosity, solvent dependency, residue formation during inkjet printing, and reduced quantum yield and external quantum efficiency, especially under varying UV intensities.
Innovation Solution
A photocurable composition comprising a reactive monomer, light emitting moiety, antioxidant, and polymerization initiator, with optional scattering particles, designed to maintain low viscosity and prevent radical formation, optimized for inkjet printing with improved thermal stability and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high loading of light emitting moieties is mixed into the composition, then the light emission performance is improved, but the viscosity increases making it unsuitable for inkjet printing
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific reactive monomers (acrylates, vinyl monomers) and solvents that modify the viscosity characteristics of the composition. This allows high loading of light emitting moieties (5-50 wt%) to be achieved while maintaining viscosity within the inkjet printable range (10-500 cP) through careful selection and ratio control of composition components.
2Productivity
If conventional compositions are used for inkjet printing, then printing can be performed, but residue forms around the inkjet printing nozzle during and after printing
Solution Approach 1:
The patent modifies the compositional parameters by incorporating volatile solvents (alcohols, esters, ethers) that evaporate completely after printing, and adjusts the viscosity range to ensure proper flow and complete deposition. This eliminates residue formation around the nozzle while maintaining productive inkjet printing operation.
3Productivity
If photo induced polymerization is performed at high UV light intensity, then curing speed is improved, but oxidation damage occurs reducing quantum yield and external quantum efficiency
Solution Approach 1:
The patent converts the potentially harmful effect of high-energy UV light (which causes oxidation) into a beneficial process by carefully selecting photopolymerization initiators that activate at controlled wavelengths and by adding antioxidants. This allows high UV intensity curing (achieving fast curing speed) while the antioxidant system scavenges free radicals and prevents oxidation damage to light emitting moieties, preserving quantum yield.
Solution Approach 2:
The patent introduces antioxidants as intermediary substances that mediate between the UV curing process and the light emitting moieties. These antioxidants act as free radical scavengers, intercepting harmful oxidative species generated during high-intensity UV curing before they can damage the light emitting moieties, thus protecting quantum yield while allowing fast curing.
4Reliability
If homogeneous dispersion of light emitting particles is achieved, then optical performance is improved, but the composition requires complex dispersing agents increasing formulation complexity
Solution Approach 1:
The patent creates a composite material system where the reactive monomer matrix and solvent work synergistically to disperse light emitting particles. The composition combines acrylate/vinyl monomers with specific solvents (alcohols, esters, ethers) that provide both dissolution capability and dispersion stability, achieving homogeneous dispersion of particles (5-50 wt%) without requiring separate complex dispersing agent systems.
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 dispersion, reduced viscosity, minimized residue, enhanced quantum yield and external quantum efficiency, and increased film brightness with long-term durability, even under high UV intensity, while maintaining ease of handling and printing.
Implementation Method 1
a polymerization initiator, wherein the composition comprises a photocurable composition
Implementation Method 2
an antioxidant... reducing/preventing oxidation damage of the light emitting moiety
Data Source
AI summary
The present invention relates to a composition comprising at least one light emitting moiety.