Assembly‐Independent Intramolecular Chiroptical Amplification in Figure‐Eight‐Shape Multi‐Resonance Emitters: Efficient Solution‐Processed Circularly Polarized Electroluminescence

ABSTRACT Incorporating chirality into multi‐resonance (MR) frameworks offers an attractive route to narrowband circularly polarized luminophores, yet chiroptical amplification is constrained by decoupling between chiral perturbation and MR‐confined radiative transitions. Self‐assembly amplifies chirality through helically coupled emissive dipoles, but its morphology‐dependent order conflicts with efficient electroluminescence. Here, we establish a self‐assembly‐independent intramolecular amplification strategy based on a C 2 ‐symmetric figure‐eight macrocyclic MR architecture. Theoretical calculations reveal that transition‐symmetry control and through‐space interchromophoric coupling strengthen intramolecular chiral exciton interactions while preserving intrinsic MR emission. TmCz‐[10]AD integrates narrowband emission, fast reverse intersystem crossing of 2.31 × 10 5 s −1 , high photoluminescence quantum yield and a dissymmetry factor (| g PL |) approaching 10 −2 , enabling solution‐processed organic electroluminescent (EL) device with a maximum external quantum efficiency exceeding 20.5% and an | g EL | value of 6.2 × 10 −3 .