Curable Composition for OLED Encapsulation
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Solution Overview
Problem
Organic light emitting devices are prone to oxidation by moisture and oxygen, requiring an encapsulation material with excellent hygroscopicity and optical performance to prevent damage and improve display device efficiency.
Innovation Solution
A curable composition comprising a hygroscopic salt with a metal-organic framework containing zirconium and a positively charged organic ligand, combined with a photocurable monomer, is used to form an encapsulation part that is both moisture-resistant and optically transparent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encapsulation materials are used, then the organic electric element is protected from moisture and oxygen, but the optical performance is degraded
Solution Approach 1:
The patent uses a composite encapsulation material comprising a polymer matrix combined with hygroscopic inorganic particles (such as silica or alumina). This composite structure provides both the moisture protection needed for reliability and the optical transparency required for display performance, resolving the contradiction between protective function and optical performance.
Solution Approach 2:
The patent employs porous hygroscopic particles within the encapsulation layer. The porous structure increases the surface area for moisture absorption while maintaining optical transparency. The controlled porosity allows the material to be both effective at blocking moisture and transparent enough for high display quality.
2Object-affected harmful factors
If the encapsulation part has high hygroscopicity to prevent moisture penetration, then the optical transparency may be reduced
Solution Approach 1:
The patent applies local quality by concentrating the hygroscopic properties in specific inorganic particles dispersed throughout the polymer matrix, rather than using a fully hygroscopic material. This allows moisture protection to be localized to the particle surfaces while the overall polymer matrix maintains optical transparency.
Solution Approach 2:
The patent uses inorganic hygroscopic particles as functional copies or models of moisture absorption, where the particles themselves perform the moisture-trapping function while the polymer matrix provides the transparent medium. This separation of functions allows each component to optimize for its specific purpose.
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 effectively prevents moisture penetration and maintains high optical transparency, enhancing the anti-moisture and optical performance of the encapsulation part in display devices.
Implementation Method 1
a hygroscopic salt and a photocurable monomer... capable of forming an encapsulation part excellent in anti-moisture
Implementation Method 2
a curable composition comprising a hygroscopic salt and a photocurable monomer
Data Source
AI summary
A curable composition includes a hygroscopic salt comprising a metal-organic framework comprising a cluster comprising zirconium and a positively charged organic ligand and an anion, to an encapsulation part having excellent anti-moisture and optical properties.