Monobenzochrysene Derivative Host Material for Organic EL Devices
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Solution Overview
Problem
Current organic electroluminescence (EL) devices face challenges in achieving long lifetime and high efficiency while operating at low voltage, with existing emission materials not fully addressing these requirements.
Innovation Solution
A monobenzochrysene derivative is developed and used as a material in organic EL devices, specifically designed to enhance the device's lifetime and efficiency by forming a specific structure that includes various aryl and heteroaryl groups, acting as a host material in the emitting layer with optional fluorescent or phosphorescent dopants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional emission materials are used in organic EL devices, then the device can operate and emit light, but the lifetime is short and efficiency is low
Solution Approach 1:
The patent changes the chemical structure parameters of the emission material by using monobenzochrysene derivatives with specific substituents (aryl groups with 6-50 carbon atoms or heteroaryl groups with 5-50 carbon atoms) to achieve both long lifetime and high efficiency. This structural parameter optimization allows the material to exhibit superior electro luminescence properties compared to conventional materials.
Solution Approach 2:
The invention employs composite material design by combining the monobenzochrysene derivative host material with appropriate dopants (fluorescent or phosphorescent) to create an emitting layer that achieves both extended lifetime and high emission efficiency. The composite structure leverages the synergistic effects of the host-guest system.
2Power
If conventional emission materials are used, then the device can be fabricated, but it requires high operating voltage
Solution Approach 1:
The patent optimizes the energy level parameters of the emission material through careful selection of monobenzochrysene derivative structures with specific substituents. This parameter optimization enables the material to achieve low operating voltage (improved power efficiency) while maintaining or enhancing emission efficiency, resolving the trade-off between voltage requirements and performance.
3Duration of action of stationary object
If existing host materials are used in the emitting layer, then the device structure can be formed, but the lifetime and efficiency cannot be simultaneously optimized
Solution Approach 1:
The patent applies local quality optimization by designing monobenzochrysene derivatives with specific substituent patterns at particular positions on the core structure. This localized structural modification allows the material to achieve both long lifetime and high efficiency without requiring overly complex overall molecular structures, thus balancing performance with structural 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 monobenzochrysene derivative results in organic EL devices with extended lifetime and high efficiency, capable of being driven at low voltage, improving the overall performance of the devices.
Implementation Method 1
An organic electroluminescence device (hereinafter the term 'electroluminescence' is often abbreviated as 'EL') is a self-emission device utilizing the principle that a fluorescent compound emits light by the recombination energy of holes injected from an anode and electrons injected from a cathode when an electric field is impressed.
Implementation Method 2
Use of a phosphorescent compound as an emission material for utilizing triplet energy for emission has been studied.
Data Source
Figure 1
AI summary
A monobenzochrysene derivative shown by the following formula (1): wherein R1 to R14 are independently a hydrogen atom or a substituent, and at least one of R1 to R14 is a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms which does not contain an anthracene skeleton and a benzo[g]chrysene skeleton or a substituted or unsubstituted heteroaryl group having 5 to 50 ring carbon atoms which does not contain an anthracene skeleton and a benzo[g]chrysene skeleton, excluding the case where R8 and R9 are unsubstituted phenyl groups and R1 to R7 and R10 to R14 are hydrogen atoms and the case where R9 is an unsubstituted phenyl group and R1 to R8 and T10 to R14 are hydrogen atoms.