Ultrabright Luminescence from Gold Nanoclusters: Rigidifying the Au(I)鈥揟hiolate Shell

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• 作者：Kyunglim Pyo ; Viraj Dhanushka Thanthirige ; Kyuju Kwak ; Prabhu Pandurangan ; Guda Ramakrishna ; Dongil Lee
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：July 1, 2015
• 年：2015
• 卷：137
• 期：25
• 页码：8244-8250
• 全文大小：393K
• ISSN：1520-5126

文摘

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鈥搒hell 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)鈥搕hiolate shell.