Photocurable Light-Emitting Composition for Low-Viscosity Inkjet Printing
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Solution Overview
Problem
Existing compositions face challenges in achieving homogeneous dispersion of light-emitting moieties and scattering particles, high viscosity, solvent residue during inkjet printing, and poor thermal stability, leading to clogging and reduced quantum yield (QY) and external quantum efficiency (EQE).
Innovation Solution
A photocurable composition comprising light-emitting moieties with specific ligands, reactive monomers, and chemical compounds with controlled polarity, allowing for improved dispersion and reduced viscosity, suitable for inkjet printing, and enhanced thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high loading of light emitting moieties is used to improve emission intensity, then the composition viscosity increases, but this causes poor inkjet printing properties and nozzle clogging
Solution Approach 1:
The patent introduces a specific chemical compound with controlled polarity (molecular weight 200-2000, specific functional groups) as an intermediary substance. This compound mediates between the light emitting moieties and the reactive monomer, enabling high loading (5-50 wt%) of light emitting moieties while maintaining low viscosity suitable for inkjet printing, thus resolving the contradiction between emission intensity and printability
Solution Approach 2:
The patent controls the polarity parameter of the chemical compound within a specific range (0.5-2.0) to optimize the dispersion of light emitting moieties. By adjusting this polarity parameter, the composition achieves both high light emitting moiety loading and low viscosity, simultaneously improving emission intensity and inkjet printing properties
2Ease of operation
If conventional solvents are used to reduce viscosity for inkjet printing, then printability improves, but solvent residue remains after printing causing quality issues
Solution Approach 1:
The patent extracts and eliminates the solvent component from the composition entirely. By using a solvent-free system with a reactive monomer and a polarity-controlled chemical compound, the invention achieves inkjet printability without leaving any solvent residue, thus resolving the contradiction between printability and residue-free printing
Solution Approach 2:
The patent changes the physical state parameter from solvent-based liquid to a reactive monomer system with controlled polarity. This parameter change enables the composition to be printed via inkjet without solvent, eliminating residue while maintaining good printability
3Manufacturing precision
If light emitting moieties are dispersed in the composition, then emission uniformity improves, but aggregation occurs reducing quantum yield and external quantum efficiency
Solution Approach 1:
The chemical compound with controlled polarity acts as a mediator that prevents aggregation of light emitting moieties. It provides steric and/or electrostatic stabilization, enabling uniform dispersion at high loading while maintaining individual particle emission properties, thus simultaneously achieving dispersion uniformity and high quantum yield
Solution Approach 2:
The patent optimizes the polarity parameter of the chemical compound (0.5-2.0) to match the surface properties of light emitting moieties. This parameter optimization prevents aggregation while ensuring uniform dispersion, resolving the contradiction between dispersion uniformity and quantum yield maintenance
4Use of energy by moving object
If scattering particles are added to improve light extraction, then optical efficiency improves, but homogeneous dispersion becomes difficult and aggregation occurs
Solution Approach 1:
The chemical compound with controlled polarity serves multiple functions simultaneously: it disperses light emitting moieties, prevents aggregation, and enables homogeneous distribution of scattering particles. This multi-functional approach achieves both improved light extraction and homogeneous dispersion without requiring separate additives
Solution Approach 2:
The polarity-controlled chemical compound acts as a universal intermediary that mediates the interaction between scattering particles and the reactive monomer matrix. It ensures homogeneous dispersion of scattering particles while maintaining their light scattering functionality, thus achieving both optical efficiency and dispersion homogeneity
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 well-dispersed light-emitting moieties with improved QY and EQE, prevents nozzle clogging, and supports large-area uniform printing with low viscosity and low vapor pressure.
Implementation Method 1
a photocurable composition comprising at least; i) a light emitting moiety having at least one ligand, preferably said light emitting moiety has a plurality of ligands; ii) at least one reactive monomer or a monomer mixture of two or more reactive monomers
Data Source
AI summary
The present invention relates to a composition comprising at least one light emitting moiety.