Encapsulating Composition for Organic Electronic Devices
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Solution Overview
Problem
Organic electronic devices, such as OLEDs, are prone to oxidation and moisture damage due to external factors, leading to durability issues and limited lifespan, which existing encapsulating compositions fail to adequately address, especially when applied using inkjet methods that require optimal spreadability and adhesion.
Innovation Solution
A curable encapsulating composition comprising a cyclic structure compound and a monofunctional compound, combined with an oxetane group-containing compound, is used to form a sealing layer that provides excellent moisture barrier properties, adhesion, and optical characteristics, suitable for inkjet application, by controlling the weight ratios and molecular weights of the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a monofunctional curable compound is used to achieve excellent spreadability when applied by inkjet method, then the composition can be easily discharged onto substrate, but the adhesion properties and optical characteristics are lowered after curing due to no reaction or over curing
Solution Approach 1:
The patent combines monofunctional curable compounds (providing spreadability) with polyfunctional curable compounds (providing adhesion and optical properties) into a single encapsulating composition. This merging allows the composition to exhibit both excellent spreadability during inkjet application and superior adhesion and optical characteristics after curing, resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The patent creates a composite curable composition containing multiple types of curable compounds with different functional groups (epoxy, oxetane, vinyl, etc.) and different functionalities (mono- and polyfunctional). This composite material approach enables the composition to balance spreadability and adhesion properties simultaneously, as the different components contribute different characteristics that complement each other.
2Reliability
If existing encapsulating compositions are used to block moisture and oxygen, then durability is improved, but the compositions are not suitable for inkjet application requiring optimal spreadability and adhesion
Solution Approach 1:
The patent modifies the physical and chemical parameters of the encapsulating composition to make it suitable for inkjet application. Specifically, the composition is designed with controlled viscosity (50-500 cP at 25°C), appropriate surface tension, and specific molecular weight ranges for the curable compounds. These parameter changes enable the composition to be properly discharged and spread during inkjet printing while maintaining its moisture and oxygen blocking capabilities for durability.
Solution Approach 2:
The patent creates a multi-functional encapsulating composition that simultaneously provides moisture barrier properties, oxygen barrier properties, adhesion to substrates, excellent spreadability for inkjet application, and optical transparency. This universal composition eliminates the need for separate materials for different functions, making the encapsulation process suitable for inkjet manufacturing while ensuring device durability.
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 blocks moisture and oxygen, ensuring the longevity of organic electronic devices, enabling top emission type devices and thin display applications while maintaining excellent optical properties and adhesion, even under high temperatures.
Implementation Method 1
a curable compound having a cyclic structure in its molecular structure and having at least two or more curable functional groups and a monofunctional curable compound
Data Source
AI summary
The present application relates to an encapsulating composition and an organic electronic device comprising the same, and provides an encapsulating composition which can effectively block moisture or oxygen introduced into an organic electronic device from the outside to secure the lifetime of the organic electronic device, is possible to realize a top emission type organic electronic device, is applicable to an inkjet method and can provide a thin display.