Ultrabright Luminescence from Gold Nanoclusters: Rigidifying the Au(I)–Thiolate Shell

Luminescent nanomaterials have captured the imagination of scientists for a long time and offer great promise for applications in organic/inorganic light-emitting displays, optoelectronics, optical sensors, biomedical imaging, and diagnostics. Atomically precise gold clusters with well-defined core–...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2015-07, Vol.137 (25), p.8244-8250
Main Authors: Pyo, Kyunglim, Thanthirige, Viraj Dhanushka, Kwak, Kyuju, Pandurangan, Prabhu, Ramakrishna, Guda, Lee, Dongil
Format: Article
Language:English
Subjects:
Cations - chemistry
Glutathione - chemistry
Gold - chemistry
Luminescence
Luminescent Agents - chemistry
Metal Nanoparticles - chemistry
Models, Molecular
Quaternary Ammonium Compounds - chemistry
Sulfhydryl Compounds - chemistry
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Summary:Luminescent nanomaterials have captured the imagination of scientists for a long time and offer great promise for applications in organic/inorganic light-emitting displays, optoelectronics, optical sensors, biomedical imaging, and diagnostics. Atomically precise gold clusters with well-defined core–shell structures present bright prospects to achieve high photoluminescence efficiencies. In this study, gold clusters with a luminescence quantum yield greater than 60% were synthesized based on the Au22(SG)18 cluster, where SG is glutathione, by rigidifying its gold shell with tetraoctylammonium (TOA) cations. Time-resolved and temperature-dependent optical measurements on Au22(SG)18 have shown the presence of high quantum yield visible luminescence below freezing, indicating that shell rigidity enhances the luminescence quantum efficiency. To achieve high rigidity of the gold shell, Au22(SG)18 was bound to bulky TOA that resulted in greater than 60% quantum yield luminescence at room temperature. Optical measurements have confirmed that the rigidity of gold shell was responsible for the luminescence enhancement. This work presents an effective strategy to enhance the photoluminescence efficiencies of gold clusters by rigidifying the Au­(I)–thiolate shell.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.5b04210