Flexible OLED Barrier Layer via Photopolymerization
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Solution Overview
Problem
Current OLED device packaging technologies, which rely on inorganic and organic multilayer structures to block water and oxygen, are inefficient and costly, leading to reduced production efficiency and increased production costs, while also limiting the service life of OLED devices due to their sensitivity to these gases.
Innovation Solution
A flexible OLED device manufacturing method involving the evaporation of a barrier material comprising a precursor polymer, photoinitiator, and cross-linking agent on a light emitting layer, followed by light-induced polymerization to form a barrier layer that blocks water and oxygen, using materials like vinyl chloride, propylene, styrene, N,N′-methylene diacrylamide, 2-hydroxy-4′-(2-hydroxyethoxy)-2-methylpropiophenone, and 2-butanone acid, with specific evaporation rate ratios to enhance the barrier effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic and organic multilayer packaging structure is used to block water and oxygen, then service life of OLED device is improved, but production time increases and production cost increases
Solution Approach 1:
The patent changes the packaging method from traditional multilayer deposition to a single-layer organic packaging layer formed by coating and curing. This parameter change in the packaging process reduces the number of deposition steps while maintaining protection against water and oxygen, thereby improving production efficiency without sacrificing device service life
Solution Approach 2:
The patent uses composite organic packaging materials comprising multiple functional components that work together to provide effective barrier properties. The organic packaging layer contains hydrophobic compounds, antioxidants, and other protective agents that collectively block water and oxygen penetration, achieving reliable protection with a simpler single-layer structure
2Reliability
If inorganic and organic multilayer packaging structure is used to block water and oxygen, then service life of OLED device is improved, but production cost increases
Solution Approach 1:
The patent simplifies the packaging structure from multiple inorganic and organic layers to a single organic packaging layer, reducing the complexity of manufacturing equipment and materials required. This parameter change in structural complexity lowers production costs while maintaining effective protection against water and oxygen through the optimized organic material composition
Solution Approach 2:
The patent employs cost-effective organic materials for the packaging layer that provide sufficient protection without requiring expensive inorganic deposition processes. The organic packaging layer uses affordable compounds such as hydrophobic polymers and antioxidants that achieve the desired barrier performance at lower material and equipment costs
3Reliability
If traditional packaging technology is used, then water and oxygen blocking is achieved, but production efficiency is reduced
Solution Approach 1:
The patent extracts the essential protective function from the complex multilayer structure and concentrates it into a single organic packaging layer. By taking out the core barrier function and implementing it through a simplified coating and curing process, the patent achieves effective water and oxygen blocking while dramatically improving production efficiency through reduced processing steps
Solution Approach 2:
The patent replaces the mechanical deposition processes (CVD, PVD, ALD) with a chemical coating and curing approach. This substitution of the packaging method from physical vapor deposition to chemical formulation and curing reduces equipment requirements and processing time, thereby improving production efficiency while maintaining protective functionality
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
This method effectively blocks water and oxygen, improving the service life of OLED devices while reducing production costs and increasing efficiency by forming a robust barrier layer through light-induced polymerization of the barrier material.
Implementation Method 1
evaporating a barrier material on a surface of the light emitting layer
Implementation Method 2
irradiating a light beam on a surface of the barrier material during evaporating the barrier material, so as to form a barrier layer
Data Source
AI summary
A flexible organic light emitting diode (OLED) device and a manufacturing method thereof are provided. The manufacturing method includes forming a flexible base; forming a light emitting layer on the flexible base; evaporating a barrier material including a precursor polymer, a photoinitiator and a cross-linking agent on a surface of the light emitting layer; and irradiating a light beam on a surface of the barrier material during evaporating the barrier material, so as to form a barrier layer on a surface of the light emitting layer to block water and oxygen.