Publication date: 15th December 2025
Colloidal semiconductor nanocrystals (NCs) combine outstanding optical properties, such as size-dependent emission and absorption, with robust photochemical stability. Recently, NCs have been employed as building blocks for mesoscale assemblies called superparticles (SPs), unlocking novel optoelectronic functionalities. Assembled SPs can behave as spherical microcavities by trapping light at their surface through optical whispering gallery modes. Under suitable excitation conditions, this can bring to population inversion and lasing. So far, most studies on optically active SPs revolve around cadmium-based NCs, limiting toxicity-sensitive applications. [1], [2] Here, we employ non-toxic copper indium sulfide/zinc sulfide (CIS/ZS) core/shell NCs, for superparticle assembly. We establish a synthetic approach based on the sequential growth of multiple zinc sulfide shells, resulting in photoluminescence quantum yield up to 75 %. We assemble these NCs into SPs, investigating the optical response of individual-SPs using steady-state and time-resolved spectroscopy under tunable laser excitation. These non-toxic artificial solids hold great promise for real-world applications in optoelectronics and photonics.
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