High‐Performance White Circularly Polarized Photoluminescence and Electroluminescence from Multi‐Emission Enantiomers

Abstract A pair of multi‐emission enantiomers, ( R )‐ DO‐PSeZ and ( S )‐ DO‐PSeZ , was designed and synthesized by integrating Se‐induced conformationally isomeric donors with a chiral carbonyl‐containing acceptor into a unified molecular framework. The enantiomers showed white emission with blue, yellow and red multi‐emission bands in solution and film at CIE coordinates of (0.39, 0.35) and (0.33, 0.34), respectively. Doped film of the enantiomers achieved a high photoluminescence quantum yield of 42 %, accompanied by mirror‐image white circularly polarized photoluminescence (WCPPL) signals with a | g PL | value of 2.6×10 −3 . Moreover, the enantiomers also showed white circularly polarized electroluminescence (WCPEL) in organic light‐emitting diodes with CIE coordinates of (0.29, 0.33) and EQE max of 3.1 %. Notably, this work represents the first single‐molecule multi‐emission WCPL materials and achieved the highest performance for white OLEDs based on single‐molecule organic materials with phosphorescent properties. Furthermore, leveraging Bragg reflection from dual‐layer cholesteric liquid crystals, the enantiomers achieved | g PL | and | g EL | values of 1.85 and 1.88, respectively, marking the highest reported values for WCPPL and WCPEL to date.