Fused Polycyclic Compound for Blue OLED Emission
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Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving low driving voltage, high luminous efficiency, and long service life, particularly in stabilizing these characteristics for efficient operation.
Innovation Solution
A light emitting element incorporating a fused polycyclic compound, represented by Formula 1, is used in the emission layer, which includes specific substituents and structural features to enhance luminous efficiency and service life, with the compound being capable of emitting delayed fluorescence in the blue wavelength range of about 430 nm to 490 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional organic electroluminescence materials are used, then the device can operate, but luminous efficiency and service life are insufficient
Solution Approach 1:
The patent modifies molecular parameters of the organic compound by introducing specific substituents (electron-withdrawing and electron-donating groups) and controlling molecular weight and structure to optimize both luminous efficiency and service life. This resolves the contradiction by changing material parameters to achieve dual improvement.
Solution Approach 2:
The patent uses composite organic electroluminescence materials comprising multiple components with specific functional groups and structures. The composite material approach allows synergistic effects that simultaneously improve luminous efficiency and service life, resolving the contradiction between these two parameters.
2Use of energy by moving object
If driving voltage is reduced, then energy consumption decreases, but maintaining high luminous efficiency and service life becomes difficult
Solution Approach 1:
The patent changes electrical parameters of the organic material by optimizing molecular structure, HOMO-LUMO energy levels, and charge transport properties. This enables low driving voltage operation while maintaining high service life through improved material parameters.
3Loss of energy
If luminous efficiency is increased, then light output improves, but service life may be reduced due to material degradation
Solution Approach 1:
The patent optimizes molecular parameters including introducing stabilizing substituents, controlling molecular weight distribution, and adjusting structural parameters to achieve high luminous efficiency while enhancing material stability and service life.
Solution Approach 2:
The patent develops organic materials with improved stability that can maintain performance over extended periods, effectively extending the service life of the electroluminescence device while maintaining high luminous efficiency.
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 fused polycyclic compound in the light emitting element improves luminous efficiency and extends the service life by suppressing intermolecular interactions and Dexter energy transfer, while also controlling emission wavelength and chemical stability, thereby enhancing the overall performance of the organic electroluminescence display device.
Implementation Method 1
thermally activated delayed fluorescence (TADF) materials utilizing delayed fluorescence phenomenon are being developed and/or exploited
Implementation Method 2
fluorescence utilizing triplet-triplet annihilation (TTA) in which singlet excitons are generated by collision of triplet excitons
Data Source
AI summary
A light emitting element may include a first electrode, a second electrode on the first electrode, at least one functional layer which is disposed between the first electrode and the second electrode and includes a fused polycyclic compound represented by Formula 1, the fused polycyclic compound including at least one electron-withdrawn group at the meta position with respect to the boron atom in the fused ring core of the fused polycyclic compound.