Fluoranthene Compound for Low Voltage Organic EL
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Solution Overview
Problem
Existing organic electroluminescence (EL) devices face challenges in achieving both high emission efficiency and low driving voltage, with known compounds having limitations in these aspects, particularly in the selection of host and dopant materials for light-emitting layers.
Innovation Solution
A compound with a specific fluoranthene skeleton structure is developed, which is used in organic EL devices to enhance emission efficiency and reduce driving voltage, characterized by a specific formula and structural components that optimize carrier mobility and film formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional host and dopant materials are used in the light-emitting layer, then the device can be manufactured with existing materials, but the emission efficiency remains insufficient and driving voltage cannot be reduced
Solution Approach 1:
The patent changes the chemical structure parameters of the host material by introducing specific fluoranthene derivatives with carbazolyl groups at defined positions. This structural parameter change optimizes carrier mobility and energy level alignment, directly improving emission efficiency while maintaining compatibility with standard fabrication processes
Solution Approach 2:
The patent creates a composite light-emitting layer by combining specifically designed host materials (fluoranthene derivatives) with dopant materials. This composite approach synergistically improves emission efficiency through optimized energy transfer while preserving ease of manufacture by using solution-processable materials
2Power
If conventional compounds are used in the light-emitting layer, then the device structure remains simple, but both driving voltage and emission efficiency cannot be optimized simultaneously
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (carbazolyl groups) at precise positions (9-position) on the fluoranthene skeleton. This localized structural modification optimizes charge injection and transport properties at critical interfaces, reducing driving voltage without requiring complex overall device architecture
Solution Approach 2:
The patent segments the molecular structure into distinct functional units: the fluoranthene core provides structural stability and optical properties, while carbazolyl substituents provide charge transport capabilities. This segmentation allows independent optimization of each function, achieving low driving voltage and high efficiency with relatively simple device structure
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 compound enables organic EL devices to operate at a lower driving voltage while maintaining high emission efficiency, improving upon the limitations of previous materials by optimizing the structure and composition of the light-emitting layer.
Implementation Method 1
When a voltage is applied between the electrodes, electrons are injected from the cathode and holes are injected from the anode each into a light emitting region. The injected electrons recombine with the injected holes in the light emitting region to form excited states. When the excited states return to the ground state, the energy is released as light.
Data Source
AI summary
The present invention provides a compound having a fluoranthene skeleton represented by the formula (1); an organic electroluminescence device having plural organic thin film layers including a light-emitting layer between a cathode and an anode, wherein at least one layer of the organic thin film layers contains the compound; and an electronic equipment provided with the organic electroluminescence device. The organic electroluminescence device realizes further lower voltage driving and has high emission efficiency. [In the formula (1), X1 to X10, L, R1 to R9, and n are as stated in the description.]