Fused Cyclic Emitters for Efficient Long-Life Light Emission
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving high efficiency and long lifespan, particularly in self-emissive devices with improved delayed fluorescent characteristics.
Innovation Solution
Incorporation of a fused cyclic compound in the emission layer of light-emitting devices, which includes a thermally activated delayed fluorescence emitter, to enhance stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorescent emitters are used in light-emitting devices, then the device can operate with standard materials, but the efficiency and lifespan are limited
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of fluorescent emitters to create fused cyclic compounds with specific chemical formulas. These structural parameter changes result in materials with improved stability and delayed fluorescent characteristics, simultaneously enhancing both lifespan and efficiency of the light-emitting device
Solution Approach 2:
The patent employs composite materials by creating fused cyclic compounds that combine multiple structural units (aromatic rings, heteroatoms, and functional groups) into a single integrated molecule. This composite structure provides both the stability needed for long lifespan and the optical properties required for high efficiency
2Stability of the object's composition
If stability is improved through material selection, then the device lifespan increases, but the manufacturing complexity may increase
Solution Approach 1:
The patent applies segmentation by designing fused cyclic compounds with modular structures consisting of repeating aromatic units and functional groups. This modular approach allows systematic synthesis while maintaining stability, reducing manufacturing complexity compared to creating entirely new complex molecules
Solution Approach 2:
The patent achieves universality by creating a class of fused cyclic compounds with general formulas that can be synthesized through standardized procedures. The core structure serves multiple functions (stability, fluorescence, charge transport), reducing the need for multiple different materials and simplifying manufacturing
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 fused cyclic compounds results in high-efficiency and long-lifespan light-emitting devices with improved stability and delayed fluorescent characteristics.
Implementation Method 1
The at least one fused cyclic compound of Formula 1 may include a thermally activated delayed fluorescence emitter
Implementation Method 2
Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transet from an excited state to a ground state to thereby generate light
Data Source
AI summary
A light-emitting device includes: a first electrode; a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode and including an emission layer, and at least one fused cyclic compound of Formula 1:wherein, in Formula 1, the variables are defined herein.