Premium
A 200‐fold Quantum Yield Boost in the Photoluminescence of Silver‐Doped Ag x Au 25− x Nanoclusters: The 13 th Silver Atom Matters
Author(s) -
Wang Shuxin,
Meng Xiangming,
Das Anindita,
Li Tao,
Song Yongbo,
Cao Tiantian,
Zhu Xiuyi,
Zhu Manzhou,
Jin Rongchao
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201307480
Subject(s) - nanoclusters , photoluminescence , quantum yield , atom (system on chip) , materials science , crystallography , doping , chemistry , nanotechnology , physics , fluorescence , optoelectronics , optics , computer science , embedded system
The rod‐shaped Au 25 nanocluster possesses a low photoluminescence quantum yield (QY=0.1 %) and hence is not of practical use in bioimaging and related applications. Herein, we show that substituting silver atoms for gold in the 25‐atom matrix can drastically enhance the photoluminescence. The obtained Ag x Au 25− x ( x =1–13) nanoclusters exhibit high quantum yield (QY=40.1 %), which is in striking contrast with the normally weakly luminescent Ag x Au 25− x species ( x =1–12, QY=0.21 %). X‐ray crystallography further determines the substitution sites of Ag atoms in the Ag x Au 25− x cluster through partial occupancy analysis, which provides further insight into the mechanism of photoluminescence enhancement.