Organic Electroluminescence Element Polymerization
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Solution Overview
Problem
Existing organic electroluminescence elements face issues with poor light emission efficiency, dark spots, and short lifespan due to insufficient material utilization, inaccurate production, and limited polymer structures, which hinder their application in various light-emitting compounds.
Innovation Solution
A multilayer organic electroluminescence element is developed with a substrate having an anode and cathode, incorporating multiple organic layers where at least one layer is formed by coating a compound with a polymerizable group followed by polymerization, and a second layer is applied and polymerized, with interfaces bonded via covalent bonds, using an ink-jet recording method and energy radiation for polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymerization is performed after coating to make materials insoluble, then elution is minimized, but polymer structures are limited and cannot be applied to various compounds
Solution Approach 1:
The patent changes the chemical structure parameters of polymerizable groups from traditional vinyl groups to isocyanate groups, allowing polymerization with diverse polyols to create varied polymer structures while maintaining insolubility and elution resistance
Solution Approach 2:
The patent creates a universal polymerization system where isocyanate-functionalized organic compounds can react with various polyols (polyethylene glycol, polypropylene glycol, polyester polyol, etc.) to form different polymer structures, enabling broad applicability across various compounds
2Ease of manufacture
If conventional coating methods are used for organic polymer materials, then production process advantages are achieved, but solubility in solvents is low and light emission efficiency is reduced
Solution Approach 1:
The patent modifies the solubility parameter by introducing isocyanate groups that enable polymerization with polyols, transforming soluble oligomers into insoluble polymers with improved light emission efficiency while maintaining coating processability
Solution Approach 2:
The patent performs preliminary polymerization by coating isocyanate-functionalized compounds followed by polymerization with polyols, creating insoluble polymer structures before final element assembly, which prevents elution and improves light emission efficiency
3Illumination intensity
If low molecular weight organic materials are used for element formation, then light emission characteristics are enhanced, but material utilization efficiency is poor and production accuracy is insufficient
Solution Approach 1:
The patent creates composite polymer structures by combining isocyanate-functionalized organic compounds with polyols, forming cross-linked polymer networks that maintain excellent light emission characteristics while improving material utilization and production accuracy through controlled polymerization
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 results in enhanced light emission efficiency, minimized dark spots, and extended lifespan of the organic electroluminescence elements, enabling their use in display and lighting devices with improved performance.
Implementation Method 1
a first organic layer is formed by coating a compound having a polymerizable group or a reactive group, followed by polymerization
Implementation Method 2
electrons and positive holes are injected into the light emitting layer and are subjected to recombination, whereby exciton is generated. During deactivation of the resulting exciton, light (fluorescence and phosphorescence) is emitted
Data Source
AI summary
In an organic electroluminescence element which incorporates a substrate having thereon an anode and a cathode and which incorporates a plurality of organic layers between the aforesaid anode and cathode, wherein at least one of the aforesaid organic layers is a first organic layer incorporating a compound having at most 10 repeating units, the first organic layer being prepared by coating the compound having at least one polymerizable group, followed by polymerization.