Polycyclic Compound for OLED Luminous Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a demand for organic electroluminescence devices with low driving voltage, high luminous efficiency, and long service life, which existing technologies have not adequately addressed, particularly in the development of materials for thermally activated delayed fluorescence (TADF) and phosphorescence emission.
Innovation Solution
The use of a polycyclic compound represented by Formula 1, which can be incorporated into various layers of the organic electroluminescence device, such as the emission layer, hole transport region, and electron transport region, to enhance luminous efficiency and service life, particularly in the blue light wavelength region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing materials are used for organic electroluminescence devices, then the device structure is simple, but the luminous efficiency is low and service life is short
Solution Approach 1:
The patent employs composite material strategy by combining the polycyclic compound (Formula 1) with host materials, dopants, and auxiliary compounds in the emission layer. This composite approach enables simultaneous achievement of high luminous efficiency through TADF mechanism and extended service life through optimized material interactions and energy transfer pathways.
Solution Approach 2:
The patent utilizes parameter changes by modifying molecular structure parameters of the polycyclic compound (Formula 1) including substituent groups (X1, X2), ring structures (Formula 2, 3, 4), and positional isomers to optimize both luminous efficiency and service life. The structural parameters are tuned to achieve appropriate HOMO-LUMO energy levels, triplet energy levels, and molecular packing for enhanced device performance.
2Power
If existing materials are used for organic electroluminescence devices, then the manufacturing process is simple, but the driving voltage is high
Solution Approach 1:
The patent achieves lower driving voltage through parameter changes in the polycyclic compound structure (Formula 1), including optimization of HOMO/LUMO energy levels, electron affinity, and hole affinity parameters. These parameter adjustments facilitate efficient charge injection and transport, reducing the voltage required for device operation while maintaining manufacturing simplicity.
3Illumination intensity
If existing materials are used for organic electroluminescence devices, then the device structure is simple, but the brightness is low
Solution Approach 1:
The patent employs composite materials in the emission layer comprising the polycyclic compound (Formula 1) as TADF emitter, host materials, and dopants. This composite structure enhances brightness through efficient triplet exciton utilization and TADF mechanism while maintaining relatively simple device architecture with standard OLED layers.
Solution Approach 2:
The patent utilizes intermediary materials including host compounds and dopants that mediate energy transfer between the polycyclic TADF emitter and the emission layer. These intermediaries facilitate efficient exciton management, triplet-triplet annihilation, and singlet exciton generation, thereby enhancing brightness without significantly complicating the 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 polycyclic compound improves the luminous efficiency and extends the service life of organic electroluminescence devices, achieving lower driving voltages and higher brightness compared to existing materials, as demonstrated in the examples provided.
Implementation Method 1
thermally activated delayed fluorescence (TADF) materials using delayed fluorescence phenomenon are being developed
Implementation Method 2
the organic electroluminescence device is a so-called self-luminescent display device in which holes and electrons injected from a first electrode and a second electrode, respectively, recombine in an emission layer, and thus a luminescent material including an organic compound in the emission layer emits light
Data Source
AI summary
Provided is an organic electroluminescence device including a first electrode, an organic layer on the first electrode, and a second electrode on the organic layer, wherein the organic layer includes a polycyclic compound represented by Formula 1. The organic electroluminescence device including a polycyclic compound represented by Formula 1 thereby exhibits high luminous efficiency.