Abstract
Thermally activated delayed fluorescence (TADF) materials have attracted great potential in the field of organic light-emitting diodes (OLEDs). Among thousands of TADF materials, highly twisted TADF emitters has become a hotspot in recent years. Compared with traditional TADF materials, highly twisted TADF emitters tend to show multi-channel charge transfer characters and form rigid molecular structures. This is advantageous for TADF materials as non-radiative decay processes can be suppressed to facilitate efficient exciton utilization. Accordingly, OLEDs with excellent device performances have also been reported. In this review, we have summarized the recent progress of highly twisted TADF materials and related devices, and overviewed the molecular design strategies, photophysical studies and the performances of OLED devices. In addition, the challenges and perspectives of highly twisted TADF molecules and relative OLEDs are also discussed.
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