Cu+ doping for tuning optical and nonlinear optical properties of multinary sulfide quantum dot glass

Multicomponent chalcogenide quantum-dot materials show significant potential in the fabrication of lighting displays, optoelectronic devices, and information-technology-based systems owing to their easily tunable optical bandgap. We used a melt-quenching method to synthesize nontoxic multicomponent chalcogenide quantum dots within a glass matrix. The results indicated that Cu + doping effectively tunes photoluminescence and nonlinear optical properties through mechanisms such as large stokes shifts, additional luminescent centers, and defect-energy levels. Moreover, the samples exhibited excellent photoluminescence efficiency, with maximum emission FWHM reaching 197.5 nm, and significant nonlinear refractive index enhancements. These properties validate the potential of the multicomponent sulfide quantum dot glasses for nonlinear optical and photonic device applications. Cu + concentration modulation allows precise control over both the photoluminescence and nonlinear optical properties, thereby positioning these quantum dot glasses as promising candidates for photonic device development.