Multi-Resonance Thermally Activated Delayed Fluorescence Polymers for High-Efficiency and Narrowband Solution-Processed Green OLEDs

Abstract

A series of green multi-resonance thermally activated delayed fluorescence polymeric emitters featuring conjugation-interrupted main chain were facilely prepared via metal-free superacid-catalyzed Friedel-Crafts polyhydroxyalkylation. These emitters exhibited photoluminescence quantum yields of up to 76% and small full-width at half maximums of 35-38 nm in toluene. Corresponding solution-processed OLEDs achieved an excellent maximum external quantum efficiency of 19.4%, with CIE coordinates of (0.20, 0.62).