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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Triarylboron-Based Fluorescent Organic Light-Emitting Diodes with External Quantum Efficiencies Exceeding 20
Katsuaki Suzuki1, Shosei Kubo1, Katsuyuki Shizu1
1Institute for Chemical Research Kyoto University, Uji, Kyoto 611-0011 (Japan).
Angewandte Chemie (International Ed. in English)
|November 14, 2015
Summary
New triarylboron compounds enable efficient sky-blue to green emission in organic light-emitting diodes. These materials achieve high quantum yields and external efficiencies through thermally activated delayed fluorescence.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Triarylboron compounds are functional materials due to electron-accepting properties from vacant boron p orbitals.
- Their unique electronic structure makes them promising for optoelectronic applications.
Purpose of the Study:
- To design and synthesize novel donor-acceptor triarylboron emitters.
- To investigate their potential for thermally activated delayed fluorescence (TADF) applications.
Main Methods:
- Synthesis of new triarylboron derivatives.
- Photoluminescence spectroscopy to determine quantum yields.
- Fabrication and characterization of organic light-emitting diodes (OLEDs).
Main Results:
- The synthesized emitters exhibit sky-blue to green emission.
- High photoluminescence quantum yields (PLQYs) of 87-100% were achieved in host matrices.
- OLEDs demonstrated high external quantum efficiencies (EQEs) of 14.0-22.8%.
Conclusions:
- The developed triarylboron emitters are highly efficient for TADF.
- Efficient up-conversion from triplet to singlet states and subsequent radiative decay enable high OLED performance.
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