Nitrogen-Substituted Fluoranthene Compounds for Low-Voltage Organic EL Devices
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Solution Overview
Problem
Current organic electroluminescence (EL) devices require improved materials to enhance performance, particularly for low-voltage operation.
Innovation Solution
A compound with specific structural features, where nitrogen atoms are substituted in the fluoranthene skeleton and combined with aromatic heterocyclic groups, is used as a material for organic EL devices, serving as a host or dopant in light emitting layers and various thin-film layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in organic EL devices, then device structure and operation are maintained, but device performance and efficiency are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of organic compounds through nitrogen atom substitution at specific positions (1-6 or 7-10) of the fluoranthene skeleton and introducing aromatic heterocyclic groups. These structural parameter changes result in improved charge transport properties and light emission efficiency, directly resolving the contradiction between device performance and emission efficiency
Solution Approach 2:
The patent employs composite material principles by creating compounds that combine fluoranthene skeleton with aromatic heterocyclic groups (such as carbazole, triphenylamine, or indole moieties). This composite molecular structure integrates the benefits of both structural components, achieving superior electron mobility and hole mobility balance, which enhances overall device performance and light emission efficiency
2Ease of operation
If conventional materials are used in organic EL devices, then device operation is maintained, but operating voltage is high
Solution Approach 1:
The patent utilizes parameter changes by optimizing the HOMO and LUMO energy levels through nitrogen substitution and heterocyclic group introduction. This energy level optimization reduces the voltage required for charge injection and transport while maintaining stable device operation, effectively resolving the contradiction between ease of operation and operating voltage
Solution Approach 2:
The patent replaces conventional organic materials with newly designed nitrogen-containing fluoranthene derivatives that possess inherent high mobility characteristics. This material substitution eliminates the need for high operating voltages typically required in conventional organic EL devices, achieving low-voltage operation while maintaining operational stability
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 compound improves the performance of organic EL devices by enabling efficient light emission and reducing operating voltage, making it suitable for low-voltage organic EL devices.
Implementation Method 1
When voltage is applied across the electrodes, electrons are injected from the cathode side and holes are injected from the anode side. Further, the electrons recombine with the holes in the light emitting layer to form an excited state, and light is emitted when the excited state returns to the ground state.
Data Source
AI summary
The present invention provides a material useful as an organic electroluminescence device material, and particularly provides: a compound having, as a substituent, a substituted aromatic heterocyclic group having a specific structure wherein any of the 1-position to 6-position or the 7-position to 10-position of fluoranthene is substituted with a nitrogen atom; a material for low-voltage organic electroluminescence devices using the compound; and an organic electroluminescence device and an electronic equipment using the material.