Organic Light Emitting Device Hole Injection and Electron Transport Layers
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Solution Overview
Problem
Existing organic light emitting devices face challenges in improving service life and efficiency due to limitations in material performance for hole injection, electron transport, and stability.
Innovation Solution
The use of specific compounds represented by Chemical Formula 1 and Chemical Formula 2 as the first and second organic material layers, respectively, which enhance electron transport, hole injection, and stability, forming a multi-layer structure with a hole injecting layer, hole transporting layer, light emitting layer, electron transporting layer, and electron injection layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic materials are used in the organic light emitting device, then the device structure can be simplified, but the service life and efficiency characteristics are insufficient
Solution Approach 1:
The organic material layer is segmented into multiple functional sub-layers: hole injection layer, hole transporting layer, light emitting layer, electron transporting layer, and electron injection layer. Each layer uses specific compounds (Formulas 1-5) optimized for its function, resolving the contradiction by achieving reliable service life through specialized materials while managing complexity through functional segmentation.
Solution Approach 2:
The patent employs composite material structures where each organic layer combines specific compounds with defined molecular structures (Formulas 1-5). These composite materials provide synergistic effects that extend service life and improve efficiency, balancing the need for complex material composition with performance requirements.
2Productivity
If conventional organic materials are used, then manufacturing can be simpler, but efficiency and voltage characteristics are insufficient
Solution Approach 1:
Each organic material layer is designed with local quality - specific compounds (Formulas 1-5) are selected for each layer based on its specific function. The hole injection layer uses compounds optimized for hole injection, electron transporting layers use compounds optimized for electron transport, achieving high device efficiency through localized material optimization rather than uniform materials throughout.
3Stability of the object's composition
If standard organic materials are used, then device structure can be simpler, but stability and thermal resistance are insufficient
Solution Approach 1:
The patent achieves thermal stability by changing molecular parameters of the organic compounds in Formulas 1-5. Specific molecular structures with defined glass transition temperatures, HOMO/LUMO energy levels, and thermal decomposition characteristics are selected for each layer, providing enhanced thermal stability while managing structural complexity through systematic parameter optimization.
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 configuration results in improved service life and efficiency characteristics, including low voltage operation and extended service life, with the compounds demonstrating excellent hole injection, high mobility, electron stopping power, and thermal stability.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material
Implementation Method 2
holes are injected from a positive electrode into the organic material layer and electrons are injected from a negative electrode into the organic material layer
Data Source
AI summary
The present specification provides an organic light emitting device.