Fused Polycyclic Compound for OLED Emission Layer
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Solution Overview
Problem
Existing organic electroluminescence (OEL) devices face challenges in reducing driving voltage, enhancing emission efficiency, and extending lifetime while maintaining stable performance.
Innovation Solution
A light emitting element is developed, which includes a fused polycyclic compound represented by specific formulas, incorporated into the emission layer between the first and second electrodes. This compound improves emission efficiency and element lifetime.
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 emission efficiency is low
Solution Approach 1:
The patent employs phosphorescent emission materials that utilize triplet state energy, fundamentally changing the emission mechanism from conventional fluorescence. This parameter change in the emission process enables higher emission efficiency by harvesting both singlet and triplet excitons, while the specific molecular structure design optimizes the energy levels to achieve lower driving voltage operation
2Duration of action of stationary object
If existing emission materials are used, then the device can function, but the element lifetime is limited
Solution Approach 1:
The patent utilizes composite phosphorescent emission layers combining organic electroluminescence materials with phosphorescent dopants. This composite material approach creates a synergistic effect where the phosphorescent components extend the emission pathway to include triplet states, improving both lifetime and operational stability while maintaining device reliability
3Use of energy by moving object
If conventional emission mechanisms are used, then the device structure remains simple, but emission efficiency and energy utilization are insufficient
Solution Approach 1:
The patent introduces phosphorescent dopants as intermediary substances within the emission layer that mediate the conversion of electrical energy to light emission. These intermediaries facilitate triplet state utilization and enhance energy harvesting efficiency, allowing the device to achieve superior energy utilization without requiring fundamental structural complexity changes
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 in the light emitting element achieves improved emission efficiency and extended lifetime, leading to enhanced display quality in OEL devices.
Implementation Method 1
The organic electroluminescence display is different from a liquid crystal display and is a so-called self-luminescent display in which holes and electrons injected from a first electrode and a second electrode recombine in an emission layer so that a light emitting material including an organic compound in the emission layer emits light
Implementation Method 2
fluorescence emission which uses the generating phenomenon of singlet excitons by the collision of triplet excitons (triplet-triplet annihilation, TTA)
Implementation Method 3
Development is presently directed to a thermally activated delayed fluorescence (TADF) material which uses delayed fluorescence phenomenon
Data Source
AI summary
Embodiments provide a fused polycyclic compound, a light emitting element including the fused polycyclic compound, and a display device including the light emitting element. The light emitting element includes a first electrode, a second electrode disposed on the first electrode, and an emission layer disposed between the first electrode and the second electrode. The emission layer includes the fused polycyclic compound, which is represented by Formula 1 and is explained in the specification.