Photocurable OLED Encapsulation Layer for Moisture and Outgas Control
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Solution Overview
Problem
Organic light emitting diodes (OLEDs) face degradation and performance issues due to moisture, oxygen intrusion, and outgassing, which can lead to reduced lifespan and performance, especially in encapsulated structures where existing protective layers fail to adequately prevent water vapor and oxygen ingress.
Innovation Solution
A photocurable composition comprising a specific monomer represented by Formula 1, which includes phosphorus or arsenic, is used to form an organic protective layer with a low water vapor transmission rate and minimal outgas generation, combined with an inorganic protective layer to create a robust encapsulation structure for OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protective layers are used to encapsulate OLEDs, then device structure is provided, but water vapor and oxygen ingress occurs leading to degradation
Solution Approach 1:
The patent employs a composite protective layer structure combining an inorganic layer (first protective layer) and an organic photocurable layer (second protective layer). The inorganic layer provides baseline barrier properties, while the organic layer with phosphorus/arsenic monomer enhances protection against water vapor and oxygen penetration, creating synergistic防护效果 that addresses the insufficiency of single-material protective layers.
Solution Approach 2:
The patent modifies the chemical composition parameters of the protective layer by incorporating specific phosphorus-containing or arsenic-containing monomers with defined molecular structures (Formula 1). This compositional parameter change fundamentally alters the layer's barrier properties, reducing water vapor transmission rate and oxygen permeability to achieve superior protection against environmental degradation.
2Duration of action of stationary object
If conventional protective layers are used, then encapsulation is provided, but outgassing occurs under high temperature and humidity conditions
Solution Approach 1:
The patent changes the chemical composition parameters by selecting monomers with specific molecular weights, functional groups, and atomic compositions (phosphorus or arsenic content). These parameter modifications result in a cured protective layer with reduced volatile content and improved thermal stability, minimizing outgassing under high temperature and humidity operating conditions while maintaining long-term encapsulation durability.
3Reliability
If standard encapsulation materials are used, then basic protection is achieved, but performance degradation occurs over time
Solution Approach 1:
The patent creates a multi-layer composite encapsulation system where the inorganic first protective layer and the organic second protective layer with phosphorus/arsenic monomer work synergistically. This composite structure provides enhanced long-term performance stability by combining the advantages of both material types, preventing performance degradation over time through superior barrier properties and chemical stability.
Solution Approach 2:
The organic protective layer containing phosphorus or arsenic monomers acts as an intermediary barrier between the OLED and the external environment. This intermediate layer with optimized molecular structure and chemical composition provides enhanced protection against moisture and oxygen penetration, extending device lifespan while maintaining stable performance characteristics under various operating conditions.
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 solution significantly reduces outgas generation and water vapor transmission, enhancing the longevity and performance of OLEDs by forming a protective layer that minimizes environmental damage and maintains device integrity under high humidity and temperature conditions.
Implementation Method 1
a photocurable composition comprising a photocurable monomer and a monomer represented by Formula 1
Data Source
AI summary
Disclosed are a photocurable composition which includes (A) a photocurable monomer and (B) a monomer represented by Formula 1, and an apparatus including a protective layers formed of the composition;