Organic Semiconductor Compound for OLED Voltage and Stability
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Solution Overview
Problem
There is a need to improve the performance of organic semiconductor materials and devices, specifically to enhance operating voltage, efficiency, lifetime, and voltage stability over time, while also improving LUMO energy, dipole moment, and thermal properties.
Innovation Solution
A compound of formula (I) is introduced, which is used to form an organic semiconductor layer in organic electronic devices. This compound has specific structural features, including various substituents and functional groups, that enhance the device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic semiconductor materials are used, then device structure and manufacturing process are simple, but operating voltage is high and efficiency is low
Solution Approach 1:
The patent modifies the molecular structure parameters of organic semiconductor materials by introducing specific functional groups (quinoxaline, pyrimidine, triazine) and substituent patterns. This changes the electronic properties including HOMO/LUMO energy levels, dipole moments, and charge carrier mobility, thereby reducing operating voltage and improving efficiency without fundamentally changing the device architecture
Solution Approach 2:
The invention creates composite organic semiconductor compounds by combining electron-deficient core structures (quinoxaline, pyrimidine, triazine) with electron-donating substituent groups. This composite molecular design optimizes charge transport properties and energy levels, enabling lower operating voltages and higher efficiency while maintaining structural feasibility for existing OLED manufacturing processes
2Reliability
If conventional organic semiconductor materials are used, then manufacturing process is simple, but lifetime and voltage stability are poor
Solution Approach 1:
The patent optimizes molecular parameters such as dipole moment, HOMO/LUMO energy levels, and thermal stability by selecting specific core structures and substituent combinations. These parameter optimizations enhance device lifetime and voltage stability by improving charge balance and reducing degradation mechanisms, while the compounds remain compatible with existing vacuum deposition and solution processing techniques
Solution Approach 2:
The invention introduces specific functional groups at particular positions within the molecular structure to locally enhance stability and charge transport properties. For example, electron-withdrawing groups are placed at specific locations to improve electron mobility and voltage stability, while maintaining overall molecular compatibility with standard manufacturing processes
3Ease of manufacture
If organic semiconductor materials with good volatility are used, then thermal stability may be compromised, but processing properties at elevated temperatures are needed
Solution Approach 1:
The patent carefully balances molecular parameters to achieve optimal volatility and thermal stability. By adjusting substituent types and positions on the quinoxaline, pyrimidine, or triazine cores, the compounds exhibit appropriate vapor pressures for vacuum deposition while maintaining thermal stability during device operation and processing. The molecular weight and structural rigidity are optimized to prevent excessive thermal degradation
Solution Approach 2:
The invention creates composite molecular structures that combine volatile components (for easy deposition) with thermally stable frameworks (quinoxaline, pyrimidine, triazine cores). This composite design enables the material to volatilize at deposition temperatures while maintaining structural integrity and stability during device operation at elevated temperatures
Data Source
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AI summary
The present invention is directed to a compound of formula (I), wherein A 1 is represented by formula (II) and B 1 is represented by formula (III), and their use in an organic electronic device.