Fused Polycyclic Emission Layer for Efficient Long-Life OLEDs
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Solution Overview
Problem
Existing organic electroluminescence display devices face challenges in achieving high luminous efficiency and long lifespan, particularly in materials for phosphorescence and thermally activated delayed fluorescence (TADF) applications.
Innovation Solution
A light emitting element incorporating a fused polycyclic compound represented by specific chemical formulas, which enhances luminous efficiency and lifespan by optimizing the emission layer composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphorescence or TADF materials are used to improve luminous efficiency, then luminous efficiency is improved, but lifespan is reduced
Solution Approach 1:
The patent modifies the molecular structure parameters of the emission material by introducing specific fused polycyclic frameworks (triphenylene, pyrene, dibenzofuran, dibenzothiophene units) and substituent groups. This structural parameter change enables the material to achieve both high luminous efficiency through enhanced triplet exciton utilization and improved lifespan through increased molecular stability and reduced degradation pathways.
Solution Approach 2:
The patent employs composite emission layer formulations combining the fused polycyclic compound with host materials and dopants. This composite approach allows optimization of energy transfer pathways while protecting the emission material from degradation, simultaneously achieving high luminous efficiency and extended device lifespan.
2Use of energy by moving object
If emission layer composition is optimized to improve luminous efficiency, then luminous efficiency is improved, but material stability is reduced
Solution Approach 1:
The patent systematically varies structural parameters of the fused polycyclic compounds including ring fusion patterns, substituent types and positions. These parameter changes are designed to optimize the balance between energy transfer efficiency (for high luminous efficiency) and molecular robustness (for material stability), achieving both goals simultaneously.
Solution Approach 2:
The patent introduces different functional groups and substituents at specific locations on the fused polycyclic core structure. This local differentiation allows specific regions of the molecule to optimize for energy transfer while other regions provide structural stability and resistance to degradation, resolving the contradiction between luminous efficiency and material stability.
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 organic electroluminescence display devices.
Implementation Method 1
the technology on fluorescence emission using triplet-triplet annihilation (TTA), which is a phenomenon in which singlet excitons are generated by collision of triplet excitons
Implementation Method 2
the technology on fluorescence emission using triplet-triplet annihilation (TTA)
Implementation Method 3
developments of materials for thermally activated delayed fluorescence (TADF) using a delayed fluorescence phenomenon
Implementation Method 4
organic electroluminescence display devices that combine holes and electrons in the emission layer injected, respectively, from the first electrode and the second electrode
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A light emitting element including a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode is provided. The emission layer contains a first compound represented by Formula 1.