Mechanochemical Construction of 0D Cu(I)-Based Luminescent Superclusters through Dynamic Ligand Fusion: Toward Eco-Friendly Stimuli-Switchable Optical Materials

cluster to strengthen Cu···Cu interactions and stabilize the lattice. Crystallographic and DFT analyses demonstrate that the cluster's rigid architecture contributes to its photophysical performance: a photoluminescence quantum yield of 93%, lifetime of 6.01 μs, and thermal stability up to 300 °C. Furthermore, the ligand-cation interactions enable stimuli-responsive dual-mode emissions, with reversible spectral shifts and intensity modulation upon thermal and solvent stimuli, a behavior rarely reported in Cu(I) halides. By integrating the solvent-free synthesis, cluster-based structural design, and stimuli-responsive behavior, this work provides a viable approach to multifunctional optical materials, as exemplified in anticounterfeiting and adaptive optoelectronic applications.