On‐Demand Circularly Polarized Room‐Temperature Phosphorescence in Chiral Nematic Nanoporous Silica Films

Abstract Circularly polarized room‐temperature phosphorescence (CPRTP) is of paramount importance for applications in information encoding, bioimaging, and optoelectronic devices, however, it remains challenging to organize highly efficient CPRTP materials with controlled handedness long afterglow. Herein, as an outstanding novel finding, diclosed that ultralong on‐demand chiroptical properties simple realize using the earth‐abundant cellulose silica. It shown left‐handed chiral nematic nanoporous silica films featuring defect photoluminescence enable unprecedented control handedness. This work presents display right‐handed dissymmetry factors up −0.130 0.093 well afterglow lifetimes 1.094 0.949 s, respectively. The potential transparent films, capable selective reflection circularly light, development anticounterfeiting optical labels showcased. a versatile strategy step toward from readily available phosphors photonic applications.