Fused Polycyclic Compounds for Efficient, Long-Life OLED Elements
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Solution Overview
Problem
Existing organic electroluminescence elements face challenges in achieving low driving voltage, high light emitting efficiency, and long lifespan, which are essential for efficient display devices.
Innovation Solution
Incorporating a fused polycyclic compound represented by specific formulas into the functional layers of the light emitting element, including an emission layer that emits delayed fluorescence, enhances light emitting efficiency and extends the element's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic compounds are used in OLED emission layers, then device structure is simple, but light emitting efficiency is low and service life is short
Solution Approach 1:
The patent modifies the molecular structure parameters of the organic compound by introducing a specific fused polycyclic framework with formula (1), where X1 and X2 are O, S, or NR1, and A-C rings are monocyclic aromatic hydrocarbon or heterocycle rings. This structural parameter change enables the compound to achieve both high light emitting efficiency and extended service life simultaneously
Solution Approach 2:
The patent employs a composite molecular structure combining fused polycyclic aromatic rings with specific heteroatoms (O, S, or NR1) at defined positions. This composite structure integrates the benefits of aromatic stability and heteroatom functionality to achieve superior performance in both efficiency and durability
2Productivity
If phosphorescence or TTA materials are used to improve light emitting efficiency, then light emitting efficiency increases, but material complexity and synthesis difficulty increase
Solution Approach 1:
The patent divides the complex fused polycyclic structure into modular components: a core aromatic ring system (A-C rings) with defined heteroatom positions (X1, X2). This segmentation allows for systematic variation of substituents (R1-R9 in formula (2)) while maintaining the core functional structure, simplifying the synthesis process
Solution Approach 2:
The patent introduces specific functional groups (cyano, nitro, amino, alkoxy, etc. in formula (2)) at particular positions on the fused polycyclic structure to optimize performance. This localized modification approach allows tuning of light emitting properties without redesigning the entire molecular framework
3Productivity
If delayed fluorescence emission is implemented, then light emitting efficiency improves, but device complexity increases
Solution Approach 1:
The fused polycyclic compound in formula (1) inherently possesses the structural features necessary for delayed fluorescence emission through its molecular orbitals and exciton dynamics. The compound self-provides the required functionality without requiring additional complex emission layers or auxiliary materials, maintaining device simplicity
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 improves light emitting efficiency and extends the lifespan of the organic electroluminescence elements, meeting the requirements for high-performance display devices.
Implementation Method 1
thermally activated delayed fluorescence (TADF) materials utilizing a delayed fluorescence phenomenon
Implementation Method 2
fluorescence emission utilizing triplet-triplet annihilation (TTA) in which singlet excitons are generated through collision of triplet excitons
Implementation Method 3
holes and electrons respectively (e.g., separately) injected from a first electrode and a second electrode recombine in an emission layer of the organic electroluminescence display devices, and thus a light emitting material including an organic compound in the emission layer emits light
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A light emitting element may include a first electrode, a second electrode on the first electrode, and at least one functional layer between the first electrode and the second electrode and including a fused polycyclic compound represented by Formula 1, the fused polycyclic compound including at least one carbazole substituent directly linked to the fused ring core and including at least one cyano group.