26‐2: Invited Paper: Efficient and Stable Deep‐Blue OLEDs Based on TADF Sensitized Fluorescence (TSF)

Blue TADF emitters with both linear donor‐π‐donor and acceptor‐π‐acceptor structures are constructed to facilitate delocalized excited states for enhanced mixing between charge‐transfer and locally excited states. Consequently, high kRISCs over 10 6 s ‐1 can be achieved. When utilizing these materials to sensitize a blue multiple‐resonance TADF emitter, a TADF sensitized fluorescence (TSF) OLED realized maximum external quantum efficiency up to 35% and high stability.