Homochiral Indium-Oxo Clusters With Multichromatic Circularly Polarized Luminescence

The development of chiral main-group metal-oxo clusters (MOCs) exhibiting high-performance circularly polarized luminescence (CPL) remains a significant challenge. This study presents a generalizable strategy to successfully synthesize a series of chiral indium-oxo clusters (cInOCs). These cInOCs can further self-assemble into supramolecular absolute helices through intermolecular interactions, exhibiting strong chirality and intense blue CPL with a dissymmetry factor g_lum of 0.012-0.013. To our knowledge, these cInOCs represent the first intrinsically CPL-active main-group MOCs, whose performance rivals or surpasses that of previously reported dye-doped chiral main-group MOCs systems. Capitalizing on the substantial pore channels within the cInOCs, green and yellow fluorescent dye molecules were encapsulated in situ, yielding cInOCs@Dyes composites with color-tunable CPL properties. Efficient chirality transfer from the cInOC host to the guest dyes led to enhanced and tunable photoluminescence, alongside highly adjustable and amplified CPL. A maximum g_lum of 0.037 was attained, approximately three times greater than that of the pristine cInOCs. Furthermore, the successful processability of these cInOCs or cInOCs@Dyes composites into flexible, transparent films highlights their considerable potential for practical applications in optical and photonic devices.