Fused Polycyclic OLED Materials for Delayed Fluorescence Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescence devices face challenges in achieving high emission efficiency, low driving voltage, and prolonged device life, particularly in the development of materials for stable operation.
Innovation Solution
Incorporation of a fused polycyclic compound and an amine compound in the organic layers, specifically in the emission and hole transport regions, to enhance delayed fluorescence and improve overall device efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic electroluminescence devices are used, then device operation is maintained, but emission efficiency is insufficient and device life is limited
Solution Approach 1:
The patent modifies molecular parameters of organic compounds by introducing specific fused polycyclic structures (triphenylene, pyrene, dibenzofuran units) and substituent groups to optimize HOMO-LUMO energy levels, thereby improving emission efficiency and device stability simultaneously
Solution Approach 2:
The invention employs composite organic layer structures combining multiple functional materials including hole transport layers, emission layers with dopants, and electron transport layers, where each layer is composed of specifically designed compounds that work synergistically to enhance overall device performance
2Use of energy by moving object
If driving voltage is reduced, then energy consumption decreases, but emission efficiency and device stability become difficult to maintain
Solution Approach 1:
The patent optimizes the HOMO-LUMO energy level differences of organic compounds to achieve lower driving voltages while maintaining high emission efficiency through improved charge injection and transport properties
Solution Approach 2:
The invention replaces conventional electroluminescence mechanisms with thermally activated delayed fluorescence (TADF) mechanisms, utilizing triplet-triplet annihilation and singlet exciton generation to achieve efficient light emission at lower voltages
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 proposed compounds enhance emission efficiency and potentially reduce driving voltage, leading to improved performance and longevity of organic electroluminescence devices.
Implementation Method 1
techniques on delayed fluorescence emission which uses the generating phenomenon of singlet excitons by the collision of triplet excitons (triplet-triplet annihilation, TTA)
Implementation Method 2
techniques on delayed fluorescence emission which uses the generating phenomenon of singlet excitons by the collision of triplet excitons (triplet-triplet annihilation, TTA)
Implementation Method 3
the organic electroluminescence display is a so-called self-luminescent display in which holes and electrons respectively injected from a first electrode and a second electrode recombine in an emission layer, and a light-emitting material including an organic compound in the emission layer emits light
Data Source
AI summary
An organic electroluminescence device of an embodiment includes a first electrode, a second electrode facing the first electrode, and organic layers disposed between the first electrode and the second electrode, wherein the organic layers include at least one organic layer that includes a fused polycyclic compound represented by Formula 1, thereby showing improved emission efficiency.