Hygroscopic Particle Encapsulation for OLED Moisture Protection
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Solution Overview
Problem
Organic light emitting devices are prone to oxidation by moisture and oxygen, requiring an encapsulation part with excellent hygroscopicity and optical performance to protect the organic electric elements.
Innovation Solution
A curable composition comprising hygroscopic particles with a rare earth metal core and a silane surface modification part, dispersed in a photocurable monomer, is used to form an encapsulation part that surrounds the organic electric elements, providing both anti-moisture and optical protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation part is used to protect organic electric elements from moisture and oxygen, then reliability is improved, but optical performance may deteriorate due to potential haze or reduced transparency
Solution Approach 1:
The encapsulation part uses a composite material system consisting of (meth)acrylate resin as the base polymer and dispersed hygroscopic particles (rare earth metal hydroxides with silane surface modification). This composite structure provides both protective functionality and optical clarity by combining the resin's transparency with the particles' moisture-scavenging capability.
Solution Approach 2:
The patent optimizes specific parameters including particle diameter (1-100 nm), particle content (0.1-5 parts by weight per 100 parts resin), and surface modification characteristics to achieve the desired balance between hygroscopicity and optical performance. The silane surface modification parameter is specifically controlled to enhance dispersion and maintain transparency.
2Reliability
If hygroscopic particles are added to enhance moisture protection, then reliability is improved, but manufacturing complexity increases due to dispersion and curing process requirements
Solution Approach 1:
Silane coupling agents serve as intermediaries between the rare earth metal hydroxide particles and the (meth)acrylate resin matrix. The silane modification on particle surfaces acts as a bridge that improves interfacial adhesion and ensures uniform dispersion, thereby simplifying the manufacturing process by reducing particle aggregation issues.
Solution Approach 2:
The patent replaces complex mechanical mixing and dispersion processes with a chemical approach using silane-modified particles that inherently disperse well in the resin matrix. The photocurable nature of the system also replaces lengthy thermal curing processes with faster UV or visible light curing.
3Manufacturing precision
If particle size is reduced to improve dispersion and optical performance, then manufacturing precision is improved, but manufacturing difficulty increases due to handling and processing challenges
Solution Approach 1:
The patent specifies an optimal particle size range of 1-100 nm that balances dispersion quality and handling ease. This size range is small enough to provide excellent dispersion and optical clarity but large enough to avoid the extreme handling difficulties of molecular-scale additives. The silane surface modification further facilitates handling by improving particle-resin compatibility.
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 encapsulation part exhibits enhanced hygroscopicity and optical performance, effectively preventing moisture and oxygen ingress while maintaining transparency and low haze, thus protecting the organic electric elements.
Implementation Method 1
The silane surface modification part may by formed by dehydration condensation reaction between a silane coupling agent and the rare earth metal
Implementation Method 2
A curable composition comprising a hygroscopic particle and a photocurable monomer
Data Source
AI summary
Provided are a curable composition and a display device which include a hygroscopic particle comprising a metal core and a silane surface modification part connected to the metal core, to provide an encapsulation part having excellent anti-moisture and optical properties.