Fused Polycyclic Boron Compound for OLED Emission Layer
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high light emitting efficiency, and long lifetime, which are essential for stable performance in display applications.
Innovation Solution
A light emitting element is developed that includes a fused polycyclic compound represented by Formula 1, integrated into an emission layer with specific structural substituents, which enhances light emitting properties and service lifetime by optimizing the emission spectrum and material stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional organic electroluminescence materials are used, then the device can operate, but the driving voltage is high and light emitting efficiency is low
Solution Approach 1:
The patent modifies the molecular structure of organic electroluminescence materials by introducing specific fused polycyclic frameworks and substituent groups, changing the electronic and optical parameters of the materials to achieve lower driving voltage and higher light emitting efficiency
Solution Approach 2:
The patent employs composite organic compounds combining multiple functional moieties (electron-donating groups, electron-withdrawing groups, and fused polycyclic cores) to create materials with optimized electrical and optical properties for improved device performance
2Duration of action of stationary object
If conventional organic electroluminescence materials are used, then the device can operate, but the service lifetime is short
Solution Approach 1:
The patent changes the chemical structure parameters of the organic materials to enhance their thermal and chemical stability, which directly improves the service lifetime and operational stability of the electroluminescence devices
Solution Approach 2:
The patent develops stable organic compounds that can replace less stable conventional materials, extending the operational lifetime of the devices through improved material durability and resistance to degradation
3Reliability
If phosphorescence emission or TADF materials are used to improve efficiency, then light emitting efficiency improves, but the device complexity increases
Solution Approach 1:
The patent extracts and utilizes the delayed fluorescence emission mechanism from complex phosphorescence and TADF systems, simplifying the material design while maintaining high light emitting efficiency through a focused molecular architecture approach
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 light emitting element exhibits improved light emitting efficiency and extended service lifetime, with a central emission wavelength in the range of 430 nm to 490 nm, effectively addressing the limitations of existing technologies.
Implementation Method 1
the emission layer may be to emit (e.g., configured to emit) delayed fluorescence
Implementation Method 2
fluorescence emission utilizing triplet-triplet annihilation (TTA) in which singlet excitons are generated through collision of triplet excitons
Data Source
AI summary
A light emitting element including a first electrode, a second electrode facing the first electrode, and a functional layer provided between the first electrode and the second electrode is provided. The functional layer includes an emission layer that includes a first compound with a core having a plurality of aromatic rings fused through a boron atom and two heteroatoms. The functional layer includes a hole transport region between the first electrode and the emission layer, and an electron transport region between the emission layer and the second electrode. The emission layer may further include a second compound, a third compound, and or a fourth compound.