期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 25, 页码 8244-8250出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b04210
关键词
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资金
- Korea CCS RD Center (KCRC) [NRF-2014M1A8A1074219]
- NRF [NRF-2014R1A2A1A11051032, 2011-0022975]
- Yonsei University Future-leading Research Initiative
- ACS-PRF [53999-ND5]
- Western Michigan University
- National Research Foundation of Korea [2009-0093823, 2014R1A2A1A11051032, 21A20131312351] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 coreshell 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 Au-22(SG)(18) cluster, where SG is glutathione, by rigidifying its gold shell with tetraoctylammonium (TOA) cations. Time-resolved and temperature-dependent optical measurements on Au-22(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, Au-22(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.
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