Ultrathin Encapsulating Composition for OLED Moisture Barrier
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Solution Overview
Problem
Organic electronic devices, such as OLEDs, are prone to oxidation and moisture damage from external factors, leading to durability issues and limited lifespan, which hinders their commercialization and application.
Innovation Solution
An encapsulating composition comprising an epoxy compound with an oxetane group and a photoinitiator, suitable for inkjet application, forms a sealing layer that provides excellent moisture barrier properties, adhesive strength, and curing sensitivity, preventing damage from external factors and enabling top emission type organic electronic devices with thin display capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional encapsulation materials are used to block moisture and oxygen, then the durability of organic electronic devices is improved, but the device thickness increases and top emission capability is compromised
Solution Approach 1:
The patent employs ultrathin encapsulation films with thickness of 50-200 nm that provide effective moisture and oxygen barrier properties while maintaining device thinness. The flexible organic electronic device structure allows light emission from the top surface through these thin encapsulation layers, enabling top emission capability without compromising durability against environmental factors.
2Reliability
If thick encapsulation layers are used to ensure moisture barrier properties, then the reliability is improved, but the display thinness and resolution are degraded
Solution Approach 1:
The patent achieves effective encapsulation with ultrathin films by optimizing chemical composition parameters including crosslinking density, hydrophobicity, and molecular structure of the encapsulation material. These parameter changes enable the formation of dense, defect-free ultrathin films that provide superior moisture and oxygen barrier properties at 50-200 nm thickness, maintaining both reliability and display thinness.
3Duration of action of stationary object
If conventional encapsulation materials are used to protect against oxidation, then the lifespan is extended, but the adhesive strength and curing sensitivity are reduced
Solution Approach 1:
The patent utilizes composite encapsulation structures combining organic encapsulation layers with specific functional groups (crosslinking groups, hydrophobic groups) and inorganic barrier layers. This composite approach provides both long-term protection against oxidation and moisture while achieving excellent adhesive strength through chemical bonding and curing sensitivity for reliable device assembly.
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 encapsulating composition effectively blocks moisture and oxygen, enhancing the lifespan of organic electronic devices, allowing for top emission type designs and thin display applications while maintaining high-resolution and low power consumption.
Implementation Method 1
the encapsulating composition can comprise a photoinitiator comprising an iodonium salt
Implementation Method 2
the encapsulating composition can effectively block moisture or oxygen introduced into an organic electronic device from the outside
Data Source
AI summary
Provided is an encapsulating composition and an organic electronic device comprising the same. The encapsulating composition can effectively block moisture or oxygen from being introduced into an organic electronic device from the outside. The encapsulating composition can secure the lifetime of the organic electronic device, make it possible to realize a top emission type organic electronic device, is applicable to an inkjet method and can provide a thin display.