Revisiting Anti-Stokes Emission Features of DNA-Stabilized Silver Nanoclusters.

ABSTRACT: DNA-stabilized silver nanoclusters (DNA-AgNCs) are a class of fluorophores with interesting photophysical properties. They are capable of generating anti-Stokes fluorescence upon excitation with near-infrared lasers. The anti-Stokes fluorescence has previously been speculated to be either the result of consecutive photon absorption (upconversion) or hot band absorption (HBA). Here, we revisit the anti-Stokes fluorescence of DNA-AgNCs to determine the underlying mechanistic origin. We investigate two previously studied DNA-AgNCs together with two organic fluorophores with absorption and emission features in the same spectral regions as the DNA-AgNCs. From the recorded anti-Stokes fluorescence excitation spectra, we find that all the emitters exhibit an exponential-like decaying slope on the

SUBMITTER: Liisberg MB 

PROVIDER: S-EPMC11886910 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature