Boosted Circularly Polarized Luminescence of a Chiral Metallacage Through Co‐Assembly in Confined Microfluidic Environments

Abstract Chiral metallacages, with their precisely distributed luminescent and chiral units and inherent adaptive chirality, represent an ideal framework for developing circularly polarized luminescence (CPL)‐active materials. Despite their potential, enhancing the luminescence dissymmetry factor ( g lum ) of metallacage‐based materials remains a significant challenge. In this study, a useful approach is proposed by co‐assembling the chiral donor metallacage Δ 4 / Λ 4 ‐Zn 4 A 4 with the achiral acceptor Nile red (NiR), achieving efficient energy and chirality transfer and resulting in enhanced CPL in these co‐assemblies. More importantly, microfluidic laminar flow is utilized, known for providing stable driving forces and confined spaces, to achieve a marked improvement in the g lum values of these co‐assemblies within polymethyl methacrylate (PMMA) films. Computational fluid dynamics (CFD) simulations and small‐angle X‐ray scattering (SAXS) experiments confirm that films containing Δ 4 / Λ 4 ‐Zn 4 A 4 /NiR, prepared via microfluidic chips, display well‐defined distributions of metallacages and NiR due to the controllable assembly process facilitated by microfluidic laminar flow. This work pioneers a new methodology to significantly enhance the g lum of metallacage‐based CPL materials, opening new avenues in the field of chiral photonics.