Elucidating the Near-Infrared Photoluminescence Mechanism of Homometal and Doped M₂₅(SR)₁₈ Nanoclusters.

ABSTRACT: More than a decade of research on the photoluminescence (PL) of classic Au₂₅(SR)₁₈ and its doped nanoclusters (NCs) still leaves many fundamental questions unanswered due to the complex electron dynamics. Here, we revisit the homogold Au₂₅ (ligands omitted hereafter) and doped NCs, as well as the Ag₂₅ and doped ones, for a comparative study to disentangle the influencing factors and elucidate the PL mechanism. We find that the strong electron-vibration coupling in Au₂₅ leads to weak PL in the near-infrared region (∼1000 nm, quantum yield QY = 1% in solution at room temperature). Heteroatom doping of Au₂₅ with a single Cd or Hg atom strengthens the coupling of the exciton with staple vibrations but reduces the coupling with t

SUBMITTER: Liu Z 

PROVIDER: S-EPMC10510323 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature