Fused Polycyclic Compounds for Low-Voltage, Long-Life OLED Emission
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Solution Overview
Problem
There is a continuous demand for materials in organic electroluminescence elements that can achieve lower driving voltage, increased luminescence efficiency, and longer device life in organic electroluminescence display devices.
Innovation Solution
The use of a fused polycyclic compound represented by specific chemical formulas, such as Formula 1, in the light emitting layer of a light emitting element, which includes a first electrode and a second electrode, to enhance luminous efficiency and element lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic electroluminescence materials are used, then the device can operate, but the driving voltage is high and luminescence efficiency is low
Solution Approach 1:
The patent employs TADF materials with optimized molecular structures and energy level parameters to achieve efficient triplet exciton utilization. By carefully designing the energy gap between S1 and T1 states and selecting appropriate host-guest energy level combinations, the invention transforms the material parameters to simultaneously reduce driving voltage and enhance luminescence efficiency.
Solution Approach 2:
The invention uses composite material systems comprising TADF dopant materials combined with specific host materials. This composite approach allows the TADF material to utilize triplet excitons while the host material provides appropriate energy levels and charge transport, achieving high luminescence efficiency at lower driving voltages compared to conventional single-material systems.
2Duration of action of stationary object
If conventional organic electroluminescence materials are used, then the device can operate, but the element lifespan is short
Solution Approach 1:
The patent optimizes molecular structure parameters of the TADF materials to improve chemical and thermal stability. By adjusting molecular weight, structural rigidity, and functional group composition, the invention enhances device lifespan while maintaining the TADF mechanism for efficient luminescence.
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 fused polycyclic compound improves the luminous efficiency and lifespan of the light emitting element, leading to better display quality in display devices.
Implementation Method 1
fluorescence emission in which singlet excitons are generated by the collision of triplet excitons (triplet-triplet annihilation (TTA))
Implementation Method 2
fluorescence emission in which singlet excitons are generated by the collision of triplet excitons
Implementation Method 3
technologies pertaining to phosphorescence emission that uses triplet state energy
Implementation Method 4
Development is currently directed to thermally activated delayed fluorescence (TADF) materials that utilize delayed fluorescence phenomena
Data Source
AI summary
Embodiments provide a fused polycyclic compound and a light emitting element. The light emitting element includes a first electrode, a second electrode disposed on the first electrode, and a light emitting layer disposed between the first electrode and the second electrode, wherein the light emitting layer includes the fused polycyclic compound. The fused polycyclic compound is represented by Formula 1, which is explained in the specification: