Monoamine Hole Transport Material for OLED Driving Voltage
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in reducing driving voltage, increasing emission efficiency, and extending device life, particularly in the development of materials that can stably achieve these requirements.
Innovation Solution
Incorporation of a monoamine compound with a condensed three-ring or four-ring hetero compound as substituents, including oxygen or sulfur atoms, in the hole transport region of the organic electroluminescence device, which enhances charge injection and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional materials are used in the organic electroluminescence device, then the device can operate, but the driving voltage is high and emission efficiency is low
Solution Approach 1:
The patent modifies the molecular structure of hole transport materials by changing chemical parameters - specifically incorporating condensed heterocyclic rings (three-ring and four-ring structures containing nitrogen, oxygen, or sulfur atoms) into the molecular framework. This structural parameter change optimizes the HOMO/LUMO energy levels and charge transport properties, resulting in decreased driving voltage and improved emission efficiency simultaneously
Solution Approach 2:
The patent develops composite molecular structures combining multiple functional moieties: condensed heterocyclic rings (carbazole, dibenzofuran, dibenzothiophene, etc.) linked with various substituents and functional groups. These composite molecular designs create materials that simultaneously exhibit enhanced hole transport capability, improved charge balance, and optimized energy levels, resolving the contradiction between driving voltage and emission efficiency
2Duration of action of stationary object
If conventional materials are used in the organic electroluminescence device, then the device can function, but the device life is short
Solution Approach 1:
The patent changes the chemical composition parameters by introducing stable condensed heterocyclic ring structures with strong C-C and C-heteroatom bonds. These structural modifications enhance the molecular stability and resistance to degradation, thereby extending device operational life while maintaining functional reliability
Solution Approach 2:
The patent replaces conventional short-lived organic materials with more stable heterocyclic-based compounds that have enhanced chemical inertness and resistance to oxidative and photolytic degradation. Although the molecular structure is more complex, the improved stability and extended device life make these materials preferable for long-term operation
3Reliability
If materials with improved charge transport are used, then emission efficiency increases, but the complexity of material synthesis increases
Solution Approach 1:
The patent employs modular molecular design where stable heterocyclic core structures (carbazole, dibenzofuran, dibenzothiophene) are combined with various substituent groups. This segmentation allows independent optimization of different molecular regions - the core provides structural stability while substituents tune charge transport properties - and facilitates stepwise synthesis procedures
Solution Approach 2:
The patent systematically varies chemical parameters such as the type of heteroatom (N, O, S), the size and position of heterocyclic rings, and the nature of substituent groups to optimize emission efficiency. By establishing structure-performance relationships, the patent identifies optimal parameter combinations that achieve high emission efficiency with manageable synthesis 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 use of the monoamine compound leads to decreased driving voltage, improved emission efficiency, and extended device life, as evidenced by increased luminance and stability in organic electroluminescence devices.
Implementation Method 1
enhances charge injection and balance
Implementation Method 2
holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and a light emission material including an organic compound in the emission layer emits light
Data Source
AI summary
An organic electroluminescence device of an embodiment includes a first electrode, a second electrode on the first electrode, and an organic layer between the first electrode and the second electrode, wherein the organic layer includes a monoamine compound including a condensed three ring hetero compound and a condensed four ring hetero compound as substituents, and wherein the condensed four ring hetero compound includes two of at least one atom of an oxygen atom or a sulfur atom.