Abstract
Abstract A thermally activated delayed fluorescence (TADF) emitter, named 4CzDBN, was developed with benzonitrile and carbazole groups. It's highly symmetrical and elongated framework was intentionally devised to form strong intermolecular π-π interactions in the condensed state. Through a series of detailed studies on the photophysical properties, single crystal structures and theoretical calculations of 4CzDBN, the impact of molecular structure regulation on excited state properties were investigated thoroughly. Finally, organic light-emitting diodes (OLEDs) utilizing 4CzDBN as the single emitter realized full-color emission from sky blue (480 nm) to orange red (580 nm) at different doping concentrations, as the first single-emitter full-color OLED.
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