Zhou Meng, Song Yongbo
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
School of Biomedical Engineering, Research and Engineering Center of Biomedical Materials, Anhui Medical University, Hefei, Anhui 230032, China.
J Phys Chem Lett. 2021 Feb 11;12(5):1514-1519. doi: 10.1021/acs.jpclett.1c00120. Epub 2021 Feb 3.
The origin of photoluminescence in [Au(SR)] nanoclusters remains elusive, and there is not a universal model that can well explain the experimental result. Here, we design Au nanoclusters protected by four different types of ligands for investigation of the photoluminescence mechanism by looking into the visible to near-infrared emissions. On the basis of time-resolved emission and nanosecond transient absorption spectroscopy analyses, we propose a model that can well explain the emission bands of Au nanoclusters. The visible and near-infrared emissions have different lifetimes and are found to arise from the core-shell charge transfer state and the Au core state, respectively. The obtained insight will help to understand how the excited state deactivates and to further engineer the photoluminescence of metal nanoclusters.
[Au(SR)]纳米团簇中光致发光的起源仍然难以捉摸，并且没有一个通用模型能够很好地解释实验结果。在此，我们设计了由四种不同类型配体保护的金纳米团簇，通过研究其可见光到近红外发射来探究光致发光机制。基于时间分辨发射和纳秒瞬态吸收光谱分析，我们提出了一个能够很好解释金纳米团簇发射带的模型。可见光和近红外发射具有不同的寿命，并且分别发现它们源自核壳电荷转移态和金核态。所获得的见解将有助于理解激发态如何失活，并进一步设计金属纳米团簇的光致发光。
