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Thermally Activated Delayed Fluorescence Emitters Based on a Special Tetrahedral Silane Core
Junhui Liu1, Zhennan Zhao1, Quanwei Li1
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS Applied Materials & Interfaces
|October 24, 2023
Summary
New thermally activated delayed fluorescence (TADF) molecules based on tetraphenylsilane were synthesized. These molecules enable efficient electroluminescence and color tuning in organic light-emitting diodes (OLEDs) via spatial structure regulation.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Thermally activated delayed fluorescence (TADF) materials are crucial for efficient organic light-emitting diodes (OLEDs).
- Aggregation-caused quenching (ACQ) of triplet excitons limits the performance of many TADF emitters.
- Controlling molecular architecture is key to overcoming ACQ and enhancing emission efficiency.
Purpose of the Study:
- To design and synthesize novel TADF molecules utilizing a tetraphenylsilane skeleton.
- To investigate the impact of molecular architecture on intermolecular interactions and photophysical properties.
- To fabricate and characterize OLED devices based on the new TADF emitters for electroluminescence applications.
Main Methods:
- Synthesis of TADF molecules based on the tetraphenylsilane core.
- Structural characterization and photophysical property analysis.
- Fabrication of OLED devices using solution processing technology.
Main Results:
- Successfully designed and synthesized new TADF molecules with a tetraphenylsilane framework.
- Tetraphenylsilane's tetrahedral structure effectively reduced aggregation-induced quenching of triplet excitons.
- Achieved pure-blue and green electroluminescence with high external quantum efficiencies (EQEmax) of 6.6% and 13.8%, respectively.
- Demonstrated color tunability through control of TADF subunit numbers and spatial structure.
Conclusions:
- Tetraphenylsilane-based TADF molecules offer a promising platform for efficient and color-tunable OLEDs.
- Spatial structure regulation is an effective strategy for designing advanced TADF emitters.
- Solution-processed OLEDs utilizing these novel TADF materials show competitive performance.
