ACS Omega, Год журнала: 2025, Номер unknown

Опубликована: Фев. 19, 2025

DNA-stabilized silver nanoclusters (DNA-AgNCs) are a class of fluorophores with interesting photophysical properties. They capable generating anti-Stokes fluorescence upon excitation near-infrared lasers. The has previously been speculated to be either the result consecutive photon absorption (upconversion) or hot band (HBA). Here, we revisit DNA-AgNCs determine underlying mechanistic origin. We investigate two studied together organic and emission features in same spectral regions as DNA-AgNCs. From recorded spectra, find that all emitters exhibit an exponential-like decaying slope on red side lowest energy band. Furthermore, power dependency measurements at different wavelengths verify one-photon nature fluorescence. Ultimately, lack discrete optical transition spectra suggests HBA mechanism is most plausible cause for investigated

Язык: Английский