Condensed Polycyclic Compound for OLED Emission Layer
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Solution Overview
Problem
There is a demand for organic electroluminescence devices with low driving voltage, high luminous efficiency, and long service life, and existing materials struggle to stably achieve these characteristics.
Innovation Solution
An organic electroluminescence device incorporating a condensed polycyclic compound represented by specific formulas, which can be used in the emission layer to facilitate delayed fluorescence, particularly as a thermally activated delayed fluorescence (TADF) dopant, enhancing luminous efficiency and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used in the emission layer, then the device structure is simple, but the luminous efficiency and service life cannot be stably improved
Solution Approach 1:
The patent modifies the molecular structure parameters of the emission layer materials by introducing specific condensed polycyclic frameworks with controlled substituent positions and types. This structural parameter optimization enables stable achievement of high luminous efficiency and long service life without complicating the overall device architecture
Solution Approach 2:
The patent employs composite material design by combining condensed polycyclic core structures with various functional substituents (amine groups, alkyl groups, aryl groups, heteroaryl groups) to create emission layer materials that simultaneously achieve high luminous efficiency, appropriate triplet state energy levels, and long service life
2Duration of action of stationary object
If materials utilizing triplet state energy phosphorescence emission are used, then service life is extended, but the device requires complex material systems
Solution Approach 1:
The patent optimizes the triplet state energy level parameter (T1) of the emission layer materials to be higher than 2.5 eV through specific molecular design. This parameter control enables the material to utilize triplet state energy for phosphorescence emission and achieve extended service life while maintaining a relatively simple single-material system
Solution Approach 2:
The patent designs emission layer materials that inherently possess the required high triplet state energy levels and phosphorescence emission characteristics through their molecular structure. The materials self-regulate their energy states to achieve long service life without requiring complex multi-component systems or additional functional layers
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 condensed polycyclic compound in the organic electroluminescence device achieves high luminous efficiency and extended service life by emitting light in the blue wavelength region with improved external quantum efficiency, surpassing the performance of comparative examples.
Implementation Method 1
the generated excitons fall to the ground state and emit light to implement display... materials utilizing triplet state energy phosphorescence emission, delayed fluorescence triplet-triplet annihilation (TTA) (in which singlet excitons are generated by collision of triplet excitons), and/or thermally activated delayed fluorescence (TADF)
Implementation Method 2
An 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 to generate excitons, and the generated excitons fall to the ground state and emit light
Data Source
AI summary
An organic electroluminescence device (OLED) of an embodiment includes a first electrode, a second electrode, and an emission layer disposed between the first electrode and the second electrode The emission layer may include a condensed polycyclic compound represented by Formula 1, which is connected to two or three substituents represented by Formula 2, and the OLED may exhibit excellent luminous efficiency: