Fused Polycyclic Compound for OLED Emission Layer
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life, particularly in stabilizing materials for efficient light emission.
Innovation Solution
A light emitting element is designed with a fused polycyclic compound, specifically a compound represented by Formula 1, which is used in the emission layer, along with a hole transport region and an electron transport region, to enhance luminous efficiency and service life, emitting delayed fluorescence with a central wavelength in the range of 430 nm to 490 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional organic electroluminescence materials are used, then device operation is achieved, but luminous efficiency is insufficient and service life is limited
Solution Approach 1:
The patent modifies the molecular structure of organic electroluminescence materials by introducing specific fused polycyclic compounds with defined chemical formulas (Formulas 1 and 2), changing chemical parameters to achieve both high luminous efficiency and extended service life simultaneously
Solution Approach 2:
The invention uses composite emission layer materials combining host compounds with guest dopants (formulas 1 and 2) to create a synergistic system that achieves both high efficiency and long operational stability through material composition optimization
2Power
If triplet state energy is utilized for phosphorescence emission, then light emission is achieved, but Dexter energy transfer suppression is required to maintain efficiency
Solution Approach 1:
The patent introduces fused polycyclic compounds with specific molecular structures (formulas 1 and 2) that have localized electronic properties to suppress Dexter energy transfer at specific energy levels while maintaining overall phosphorescence emission efficiency
Solution Approach 2:
The invention converts the potentially harmful Dexter energy transfer mechanism into a beneficial process by carefully designing the energy level structure of the fused polycyclic compounds to control and optimize energy transfer pathways for enhanced phosphorescence emission
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 solution improves luminous efficiency and extends the service life of the light emitting element by utilizing the fused polycyclic compound, which suppresses Dexter energy transfer and deepens the HOMO energy level, facilitating efficient energy transfer and reducing triplet concentration, thereby maintaining emission efficiency and device stability.
Implementation Method 1
suppresses Dexter energy transfer and deepens the HOMO energy level, facilitating efficient energy transfer
Implementation Method 2
emitting delayed fluorescence with a central wavelength in the range of 430 nm to 490 nm
Implementation Method 3
fluorescence emission using triplet-triplet annihilation (TTA) in which singlet excitons are generated by the collision of triplet excitons
Implementation Method 4
holes and electrons respectively injected from a first electrode and a second electrode recombine in an emission layer, so that a luminescent material including an organic compound in the emission layer emits light
Data Source
AI summary
Embodiments provide a light emitting element that includes a first electrode, a second electrode facing the first electrode, and an emission layer which is disposed between the first electrode and the second electrode and includes a first compound represented by Formula 1, which is explained in the specification.