Reliability of Multi-Emissive Carbon Quantum Dots for Multiplexing; Assessing the Figures of Merit.

Incredible properties of quantum dots (QDs) have once again been acclaimed with this year's (2023) Nobel prize in chemistry. On the other hand, the invention of multicolour molecular imaging of cell surface receptors for tumour diagnosis by Koyama and group has opened up a new era in diagnostics. Among them carbon quantum dots (CQDs) are interesting class of fluorescent nanomaterials, superior in terms of low toxicity, high solubility and biocompatibility along with simple and cost-effective synthesis processes unlike the traditional metal chalcogenide or perovskite quantum dots.

Halide exchange mediated cation exchange facilitates room temperature co-doping of d-and f-block elements in cesium lead halide perovskite nanoparticles.

This study presents a halide exchange mediated cation exchange reaction to co-dope d- and f-block elements in CsPbX NPs at room temperature. Addition of MnCl and YbCl to CsPbBr NPs induces ion exchange reactions generating the corresponding CsPbBr/MnClYbCl NPs. In addition to the perovskite emission, the NPs display sensitized Mn and Yb emissions in concert spanning the UV, visible, and NIR spectral region.