Enhancement of Photoluminescence Quantum Yield of Silver Clusters by Heavy Atom Effect

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Abstract Many ligand‐protected metal clusters exhibit phosphorescence at room temperature. However, strategies for improving their quantum yield, a critical parameter of performance, remain poorly developed. In contrast, fluorescent dyes are commonly modified by introducing heavy atoms, such as iodine (I), to enhance intersystem crossing in the excited state, thereby harnessing atom effect increase efficiency. this study, pair silver (Ag) is successfully synthesized with internal cavities encapsulating anions (X z − ), namely sulfide ions (S 2− ) or iodide (I which significantly differ atomic number each other. Single‐crystal X‐ray diffraction and nuclear magnetic resonance spectroscopy revealed that resulting Ag composed X@Ag 54 S 20 (thiolate) (sulfonate) m , where (X, = (S, 12) (I, 11). photoelectron atoms these compounds mixed‐valence state. Furthermore, experiments on photoluminescence central anion induced an heavy‐atom similar observed organic dyes. As result, yield became 16 times higher when replaced I atom.

Language: Английский

A nearly perfect icosahedral Ir@Au₁₂ superatom with superior photoluminescence obtained by ligand engineering

Chemical Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A nearly perfect icosahedral Ir@Au 12 superatom was formed using a diphosphine ligand with benzo[ b ]phosphindole rings. The exhibited bright photoluminescence due to the symmetric structure rigidified core.

Language: Английский

Revisiting protein protected gold and silver nanoclusters: Excited state dynamics and long-lived emission

Nanoscale, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Time-resolved luminescence spectroscopy unveiled the distinct excited state dynamics of protein-conjugated gold and silver nanoclusters.

Language: Английский