Fused Aromatic Derivative Host Material for Organic EL Devices
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Solution Overview
Problem
Existing organic electroluminescence (EL) devices face challenges in achieving long lifetime, high efficiency, and low voltage operation due to limitations in emission materials used.
Innovation Solution
A specific fused aromatic derivative with an anthracene and triphenylene structure is developed, which is incorporated into the organic EL device to enhance its performance by acting as a host material in the emitting layer, allowing for the use of fluorescent or phosphorescent dopants and improving the device's efficiency and longevity.
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 be fabricated with basic structure, but the lifetime is short and efficiency is low
Solution Approach 1:
The patent employs composite materials by combining the fused aromatic derivative (host material) with fluorescent or phosphorescent dopants to create an emitting layer composite. This composite structure enables simultaneous achievement of high efficiency and long lifetime, resolving the contradiction between emission efficiency and device durability that plagues conventional single-material systems.
2Ease of operation
If conventional emission materials are used, then device fabrication is straightforward, but operating voltage remains high
Solution Approach 1:
The patent changes the chemical and electronic parameters of the emitting layer by introducing the fused aromatic derivative with specific molecular structure (formula 1). This parameter change in the host material's electronic properties enables lower operating voltage while maintaining ease of device fabrication, resolving the contradiction between operational simplicity and energy consumption.
3Power
If standard emission materials are employed, then device structure remains simple, but luminous efficiency is limited
Solution Approach 1:
The fused aromatic derivative acts as an intermediary host material that facilitates efficient energy transfer to the dopant molecules. This intermediary role enables high luminous efficiency without requiring complex device structures, as the enhanced performance arises from the molecular-level interaction between host and dopant rather than 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 this fused aromatic derivative results in an organic EL device with extended lifetime, high efficiency, and the ability to operate at lower voltages, improving overall performance and emission characteristics.
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 an emission material 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
AI summary
A fused aromatic derivative shown by the following formula (1):wherein Ra and Rb are independently a hydrogen atom or a substituent, p is an integer of 1 to 8 and q is an integer of 1 to 11, and when p and q are two or more, Ras and Rbs may be independently the same or different, and adjacent substituents Ras may form a ring, L1 is a single bond or a substituted or unsubstituted divalent linking group, and Ar1 is a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 5 to 50 ring atoms, provided that when L1 is a single bond and at least one of Ras is not a hydrogen atom, Ar1 is not a triphenylenyl group, and provided that substituents of L1 and Ar1, and Ra and Rb contain no amino group.