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For their ultra-wide color gamut, high efficiency, robustness, and solution processability, Cd-based alloy semiconductor quantumdots (AQDs) continue to proliferate by driving innovations in the fields of optoelectronics, photovoltaics,multiplex bio-imaging, and cancer research.Herein, non-toxic, low-cost isopropyl alcohol vapor-based oxidative treatment protocol is developed and applied to tune the light emission spectrumof crystalline core–shell CdSe1−xSx/ZnS quantumdots. As evidenced by the results of structural investigations, these AQDswhen exposed to vapors produced ultrasonically from10:1 isopropyl alcohol-to-watermix undergo an isotropic, diameter non-specific size reduction at the rate of∼1.3 Åmin. Nonlinear time-dependent spectral shifts, revealed experimentally, are consistent with the results of the effective-mass approximation treatment. The emission yields are seen to undergo an initial drop, yet to plateau as the etch time increases. The study opens a door to a soft, top-downmonotonic tailoring of the light emission characteristics and opto-electronic response of stoichiometricallyand hierarchically-complex core–shell constructs in technologically-viable group II–VI nano-semiconductors as well as AQD-based catalytic conversion of organic compounds.

Controlling opto-electronic characteristics of ternary II–VI alloyed quantum dots: alcohol processing assay