Organic Electronic Device Hole Transport Layer Compound
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Solution Overview
Problem
Current organic electronic devices face challenges in achieving high luminous efficiency, extended lifespan, and low driving voltage, particularly in large-area portable displays, due to limitations in the organic material layer's efficiency and thermal stability.
Innovation Solution
The organic electronic device incorporates a multilayer structure with specific stacks, including a first hole transport region, emission layer, and electron transport region, utilizing a compound represented by Formula 20 in the first hole transport layer to enhance charge balance and thermal resistance, thereby improving efficiency and lifespan while reducing driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the organic material layer is simply improved, then efficiency may increase, but lifespan and thermal stability do not maximize
Solution Approach 1:
The patent employs composite organic material structures including multiple emission layers with different materials (first emission layer with first host and first dopant, second emission layer with second host and second dopant) stacked together. This composite approach allows each layer to contribute different properties, achieving both high luminous efficiency and extended lifespan through material synergy rather than relying on a single material improvement.
Solution Approach 2:
The organic material layer is segmented into multiple distinct stacks or emission units, each with specific hole transport regions, emission layers, and electron transport regions. This segmentation allows independent optimization of each segment for efficiency while the overall structure provides thermal stability and lifespan enhancement through distributed stress and heat management.
2Productivity
If efficiency is increased, then driving voltage decreases, but crystallization due to Joule heating may occur
Solution Approach 1:
The patent utilizes parameter changes in the organic materials, specifically selecting materials with appropriate energy levels, mobility characteristics, and thermal properties. By carefully choosing materials with optimal parameters for charge transport and recombination, the device achieves high efficiency at lower driving voltages while maintaining thermal stability through materials resistant to Joule heating-induced crystallization.
Solution Approach 2:
Composite organic material structures with multiple hosts and dopants provide synergistic effects where different materials contribute different thermal and electrical properties. This composite approach enables the system to achieve high efficiency while the diverse material composition provides thermal buffer zones that prevent localized overheating and crystallization.
3Productivity
If tandem structure is used to improve power consumption and efficiency, then device complexity increases
Solution Approach 1:
The tandem structure is segmented into modular stacks where each stack contains standardized components (hole transport region, emission layer, electron transport region). This modular segmentation makes the complex structure more manageable through repetitive units, allowing systematic optimization of each module while maintaining overall device performance and simplifying the design process through pattern repetition.
Solution Approach 2:
The patent employs universal material systems and structural patterns that can be applied across multiple stacks. The same types of hole transport materials, emission materials, and electron transport materials are used in different stacks with optimized parameters, providing multi-functionality and reducing the need for entirely new material developments for each stack, thereby managing complexity.
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 achieves high luminous efficiency, increased lifespan, and low driving voltage, along with improved color purity, by optimizing the organic material layer's structure and composition, specifically through the use of the compound in the first hole transport layer.
Implementation Method 1
In general, organic electroluminescence refers to a phenomenon in which electrical energy is converted into light energy using an organic material
Implementation Method 2
the crystallization of the organic material due to Joule heating during driving may be reduced
Data Source
AI summary
Embodiments of the present invention relate to an organic electronic device capable of ensuring high luminous efficiency, low driving voltage and high heat resistance, and improving color purity or lifespan.