Cyclic Azasilane Barrier Adhesives for OLED Encapsulation
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Solution Overview
Problem
Current barrier adhesives for encapsulating (opto-)electronic devices face challenges in providing sufficient protection against water vapor and oxygen, leading to degradation of organic electronics due to high permeability rates and reactivity issues with sensitive components, especially when used for full-surface encapsulation.
Innovation Solution
A barrier adhesive comprising a reactive resin with activatable groups, an elastomer, and a transparent molecularly dispersed getter material, such as cyclic azasilanes, which maintains low water vapor permeation rates and avoids damage to organic electronics by preventing alcohol release, allowing for extended breakthrough times without compromising transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional barrier adhesives are used for encapsulation, then water vapor barrier is provided, but organic electronics are damaged due to reactivity with alcohol release
Solution Approach 1:
The patent introduces cyclic azasilane as an intermediary substance that mediates between the adhesive and the organic electronics. The cyclic azasilane reacts with water to form non-harmful products, preventing the release of harmful alcohols that would otherwise damage the organic electronics while maintaining the water vapor barrier function
Solution Approach 2:
The patent converts the harmful effect of water reaction (alcohol release) into a beneficial outcome by using cyclic azasilane. The cyclic azasilane captures the water and transforms the harmful reaction into a beneficial one, where water is consumed to form harmless byproducts, thus protecting the organic electronics
2Object-affected harmful factors
If transparent getter material is used, then damage to organic electronics is prevented, but water vapor permeation rate increases
Solution Approach 1:
The patent changes the chemical parameters of the getter material by selecting cyclic azasilane with specific molecular structure and properties. This parameter change allows the material to maintain transparency and prevent alcohol release while achieving sufficiently low water vapor permeation rate through its unique chemical composition
3Reliability
If high breakthrough time is achieved, then protection against water vapor is improved, but transparency may be compromised
Solution Approach 1:
The patent applies local quality by ensuring the cyclic azasilane is molecularly dispersed throughout the adhesive matrix rather than forming aggregated particles. This local molecular-level distribution provides uniform water scavenging activity for high breakthrough time while maintaining optical transparency, as no large particles are present to scatter light
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 adhesive achieves high breakthrough times (>1100 hours at 60°C/90% RH) while ensuring the integrity and transparency of organic electronics, making it suitable for full-surface encapsulation without damaging sensitive components.
Implementation Method 1
cyclic azasilane water scavengers
Implementation Method 2
the adhesive base has a water vapor permeation rate after activation of less than 100 g/m2
Data Source
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AI summary
A barrier adhesive comprising an adhesive base composed of at least one reactive resin having at least one activatable group, at least one elastomer, optionally at least one adhesive resin, wherein the adhesive base has a water vapour permeation rate after the activation of the reactive resin of less than 100 g/m²d, preferably of less than 50 g/m²d, especially less than 15 g/m²d, further comprising a transparent molecularly dispersed getter material and optionally a solvent, in which the getter material is at least one cyclic azasilane, has very long lag times and can be used over an area for encapsulation of organic electronic structures, since the sensitive structures are not damaged.