Organic Electroluminescence Device Electron Transport Compound
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Solution Overview
Problem
There is a continuous demand for improving the light emission efficiency and developing materials for organic electroluminescence devices that can stably achieve these properties.
Innovation Solution
An organic electroluminescence device is designed with a reduced driving voltage and high efficiency, incorporating a compound represented by Formula 1 in the electron transport region, which may improve the moving speed of electrons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional materials are used in the electron transport region, then the device structure is simple, but the driving voltage is high and electron mobility is low
Solution Approach 1:
The patent modifies the molecular structure of electron transport compounds by changing parameters such as introducing electron-deficient groups (triazine, pyrimidine rings), adjusting substituent positions, and varying carbon atom numbers in hydrocarbon ring groups. These parameter changes optimize electron affinity and LUMO energy levels, thereby improving electron mobility and reducing driving voltage while maintaining reasonable structural complexity
Solution Approach 2:
The patent employs composite molecular structures combining electron-deficient heterocyclic groups (triazine, pyrimidine, pyridine rings) with electron-rich hydrocarbon ring groups (naphthalene, anthracene, phenanthrene). This composite approach creates balanced electron transport properties, improving electron mobility while managing the complexity through systematic molecular design
2Productivity
If conventional electron transport materials are used, then the material selection is simple, but the light emission efficiency is low
Solution Approach 1:
The patent systematically varies molecular parameters including the types of heterocyclic groups (triazine, pyrimidine, pyridine), the number of carbon atoms in hydrocarbon ring groups (4-60 atoms), and the positions of substituents. These parameter changes are designed to optimize electron transport efficiency and light emission properties, achieving high productivity through precise material characterization
3Power
If high electron mobility materials are used, then the driving voltage is reduced, but the molecular structure becomes complex
Solution Approach 1:
The patent optimizes molecular parameters to achieve the right balance: introducing electron-deficient groups to reduce LUMO energy levels and improve electron injection, while controlling the size and complexity of hydrocarbon ring groups (4-60 carbon atoms) to maintain reasonable molecular weight and structural simplicity. This allows achieving low driving voltage without excessive structural complexity
Solution Approach 2:
The patent applies local quality by introducing specific electron-deficient functional groups (triazine, pyrimidine, pyridine rings) at strategic positions within the molecular structure. These localized modifications enhance electron transport properties and reduce driving voltage without requiring complete redesign of the entire molecular structure, thus 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 proposed solution achieves a reduced driving voltage and enhanced emission efficiency, contributing to the improvement of the moving speed of electrons and the overall performance of the organic electroluminescence device.
Implementation Method 1
The electron transport region may include a first compound represented by Formula 1... which may contribute to the improvement of the moving speed of electrons
Implementation Method 2
holes and electrons injected from a first electrode and a second electrode recombine in an emission layer, and a light-emitting material including an organic compound in the emission layer emits light
Data Source
AI summary
An organic electroluminescence device of an embodiment may include a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The electron transport region may include a first compound represented by Formula 1, thereby improving the moving speed of electrons. Accordingly, the organic electroluminescence device of an embodiment may show decreased driving voltage and improved efficiency.