Organic Electric Element Using Specific Compounds for Lower Driving Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescent elements face challenges in maximizing efficiency and lifespan due to suboptimal energy levels and material properties in their layers, leading to high driving voltage and reduced lifespan.
Innovation Solution
The use of specific compounds in the hole transport band layer and electron transport band layer, optimized for energy levels and interfacial properties, to improve luminous efficiency and lifespan while lowering driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic materials are used in the organic material layer, then the device structure is simple, but the luminous efficiency is low and the lifespan is short
Solution Approach 1:
The organic material layer is divided into multiple functional sub-layers: hole injection layer, hole transport layer, light emitting layer, electron transport layer, and electron injection layer. Each layer uses materials optimized for its specific function, allowing independent optimization of charge injection, transport, and recombination processes to achieve high luminous efficiency without excessive overall complexity
Solution Approach 2:
The patent employs composite material structures where each layer uses materials with specifically tailored properties (HOMO/LUMO energy levels, mobility, stability). The combination of different organic materials in a multi-layer configuration creates synergistic effects that simultaneously improve efficiency and lifespan while maintaining reasonable structural complexity
2Power
If the organic material layer is simplified, then the device complexity is reduced, but the driving voltage remains high and efficiency decreases
Solution Approach 1:
Each layer in the organic material layer is designed with locally optimized properties: hole injection layer materials are selected for optimal hole injection from the anode, transport layers for high mobility and appropriate energy levels, and the light emitting layer for efficient electroluminescence. This localized optimization allows the system to achieve low driving voltage through efficient charge transport without requiring a simplified overall structure
Solution Approach 2:
The patent systematically adjusts critical parameters including HOMO and LUMO energy levels of each layer's materials, thicknesses of individual layers, and material compositions to optimize charge injection barriers and transport efficiency. These parameter optimizations enable reduced driving voltage while maintaining the multi-layer structure necessary for high efficiency
3Productivity
If high efficiency is achieved through optimized material combinations, then luminous efficiency improves, but the device complexity increases due to multiple layer requirements
Solution Approach 1:
The organic material layer is segmented into five distinct functional layers, each with specific materials optimized for its role. This segmentation allows independent optimization of each function (hole injection, hole transport, light emission, electron transport, electron injection) to achieve high overall luminous efficiency while keeping each individual layer relatively simple and manageable
Solution Approach 2:
Certain organic materials are selected to perform multiple functions across different layers or interfaces. For example, materials are chosen whose energy levels and properties enable them to contribute to both charge transport and stabilize adjacent interfaces, reducing the need for completely separate specialized materials for each function and thereby managing complexity
4Duration of action of stationary object
If conventional materials are used without optimization, then the manufacturing process is simple, but the lifespan is short due to Joule heating and crystallization
Solution Approach 1:
The patent carefully selects materials with specific thermal and morphological parameters: high thermal stability to resist Joule heating-induced crystallization, appropriate glass transition temperatures, and molecular structures that maintain amorphous phases during operation. These parameter-based material selections extend lifespan by preventing degradation while keeping the manufacturing process relatively straightforward
Solution Approach 2:
The patent employs organic materials that can be deposited using relatively simple and cost-effective techniques such as vacuum thermal evaporation or solution processing. While the material selection is optimized for performance, the manufacturing approaches remain accessible and do not require excessively complex or expensive fabrication processes, balancing lifespan improvement with ease of manufacture
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 combination effectively reduces driving voltage and enhances both efficiency and lifespan of the organic electric element by optimizing energy levels and material properties across the layers.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material
Implementation Method 2
Joule heating generated during operation
Data Source
AI summary
An organic electric element includes a hole transport band layer which includes compound represented by Formula 1 and an electron transport band layer includes compound represented by Formula 2. The driving voltage of an organic electric element including the organic electric element can be lowered and the luminous efficiency and lifespan can be improved.