High-Capacity Optical Fingerprinting Using Dual-Peak Photoluminescence of Quantum Dots.

ABSTRACT: Counterfeiting and unauthorized duplication continue to pose significant threats across industries, ranging from electronics to pharmaceuticals. In response to this challenge, we present a novel optical fingerprinting platform based on cadmium-free CuInS₂/ZnS quantum dots (QDs), which exhibit a distinctive dual-peak photoluminescence (PL) signature. Time-resolved PL (TRPL) analysis confirms the distinct recombination origins of the two peaks, supporting the assignment to core- and interfacial/shell-related states. Our approach extracts two intrinsically coupled emissions from a single QD type, where both peaks originate within the same nanostructure, making the fingerprint inherently unclonable. This phenomenon enables the generation of rich tunable spectral profiles across a se

SUBMITTER: Ali SR 

PROVIDER: S-EPMC12781110 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature