A simple-structure TADF sensitizer enables high-performance red hyperfluorescent OLEDs with an external quantum efficiency of 40%

A simple-structure, pure-organic TADF sensitizer, namely, CFBOPXZ, targeting red hyperfluorescence was designed and synthesized. CFBOPXZ exhibits simultaneous high PLQY, rapid radiative decay and reverse intersystem crossing rates, enabling stable and narrowband red hyperfluorescent OLEDs with an external quantum efficiency of 40% and minimal efficiency roll-off.