Photoemission Mechanism of Water-Soluble Silver Nanoclusters: Ligand-to-Metal-Metal Charge Transfer vs Strong Coupling between Surface Plasmon and Emitters

被引：248

作者：

Chen, Yuting ^{[1
]}

Yang, Taiqun ^{[1
,2
]}

Pan, Haifeng ^{[1
]}

Yuan, Yufeng ^{[1
]}

Chen, Li ^{[2
]}

Liu, Mengwei ^{[1
]}

Zhang, Kun ^{[2
]}

Zhang, Sanjun ^{[1
]}

Wu, Peng ^{[2
]}

Xu, Jianhua ^{[1
]}

机构：

[1] E China Normal Univ, Dept Chem, State Key Lab Precis Spect, Shanghai 200062, Peoples R China

[2] E China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2014年 / 136卷 / 05期

基金：

美国国家科学基金会;

关键词：

AG NANOCLUSTERS; NANOPARTICLES; FLUORESCENCE; LUMINESCENT; CLUSTERS;

D O I：

10.1021/ja407911b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Using carboxylate-protected silver nanoclusters (Ag-carboxylate NCs) as a model, we separately investigated the contribution of the ligand shell and the metal core to understand the nature of photoluminescence of Ag NCs. A new Ag(0)NCs@Ag(I)-carboxylate complex core shell structural model has been proposed. The emission from the Ag-carboxylate NCs could be attributed to ligand-to-metal metal charge transfer from Ag(I)carboxylate complexes (the oxygen atom in the carboxylate ligands to the Ag(1) ions) to the Ag atoms and subsequent radiative relaxation. Additionally, we found that the emission wavelength of the Ag NCs depends on the excitation wavelength implying a strong coupling between surface plasmon and emitter in Ag NCs. The strong coupling between the surface plasmon and the emitter determines the quantum yield and lifetime. The emission mechanism of Ag NCs and its relation to the organic templates and metal cores were clearly clarified. The results should stimulate additional experimental and theoretical research on the molecular-level design of luminescent metal probes for optoelectronics and other applications.

引用

页码：1686 / 1689

页数：4

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