Controlled Synthesis of Ag2S Quantum Dots and Experimental Determination of the Exciton Bohr Radius

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• 作者：Yejun Zhang ; Yongsheng Liu ; Chunyan Li ; Xueyuan Chen ; Qiangbin Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：March 6, 2014
• 年：2014
• 卷：118
• 期：9
• 页码：4918-4923
• 全文大小：458K
• 年卷期：v.118,no.9(March 6, 2014)
• ISSN：1932-7455

文摘

Ag₂S quantum dots (QDs) have attracted increasing attention due to their appealing optical properties in the near-infrared regime. However, a full understanding of the quantum confinement effect of Ag₂S QDs has not been achieved so far. Herein, for the first time, the size-dependent excited state optical properties of Ag₂S QDs are systematically investigated by photoluminescence (PL), PL excitation (PLE), and time-resolved PL spectroscopy. Experimentally, we determine the exciton Bohr radius of Ag₂S QDs as 2.2 nm, which is highly consistent with theoretical results.