Multilayer Sealing Layer with Oxygen-Free Buffer for OLED Lifetime
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Solution Overview
Problem
Organic light-emitting diodes are prone to deterioration due to oxygen and moisture permeation, which affects the longevity of flat display devices.
Innovation Solution
A sealing layer comprising an organic film, an oxygen-free buffer layer, and an inorganic film is applied over the light-emitting diode, preventing moisture and oxygen ingress through a stacked structure that includes multiple organic and inorganic layers formed using methods like reactive sputtering or chemical vapor deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a sealing layer is applied to prevent oxygen and moisture permeation, then the lifetime of the light-emitting diode is extended, but the device structure becomes more complex
Solution Approach 1:
The sealing layer is divided into multiple distinct functional layers: an organic film layer for initial sealing, an oxygen-free buffer layer to prevent oxygen permeation, and an inorganic film layer for enhanced barrier properties. This segmentation allows each layer to address specific deterioration mechanisms, effectively extending LED lifetime while managing complexity through functional specialization.
Solution Approach 2:
The sealing structure employs a composite multilayer design combining organic materials (acrylate, methacrylate, vinyl, epoxy, urethane, cellulose, or silane-based cured products), oxygen-free organic materials (represented by Formula 1 with oxygen-free aromatic cores), and inorganic materials (metals, metal nitrides, metal oxides, or metal oxynitrides). This composite approach leverages the complementary properties of different material classes to achieve superior protection against both moisture and oxygen permeation.
2Reliability
If multiple sealing units are used to improve sealing performance, then the prevention of oxygen and moisture permeation is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The sealing function is segmented into multiple units (one to ten sealing units may be used), where each unit consists of the tri-layer structure (organic film + oxygen-free buffer layer + inorganic film). This segmentation enables progressive enhancement of sealing performance against oxygen and moisture while maintaining a standardized repeating module that can be manufactured systematically.
Solution Approach 2:
The manufacturing process utilizes parameter changes in the form of sequential deposition methods (reactive sputtering or chemical vapor deposition) to form each layer with controlled thickness and composition. By adjusting deposition parameters such as plasma power, gas flow rates, and layer thickness, the process optimizes both the protective performance and manufacturability of the multilayer sealing structure.
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 sealing layer effectively extends the lifetime of flat display devices by preventing moisture and oxygen permeation, ensuring the integrity and performance of the organic light-emitting diodes.
Implementation Method 1
The inorganic film may be formed by reactive sputtering or chemical vapor deposition (CVD) using oxygen gas or oxygen plasma.
Implementation Method 2
The inorganic film may be formed by reactive sputtering or chemical vapor deposition (CVD) using oxygen gas or oxygen plasma.
Data Source
AI summary
A flat display device includes a substrate, a light-emitting diode on the substrate, and a sealing layer on the light-emitting diode, the sealing layer including at least one sealing unit that includes an organic film, an oxygen-free buffer layer on the organic film, and an inorganic film on the oxygen-free buffer layer.