Photoluminescence Quenching of CdSe Core/Shell Quantum Dots by Hole Transporting Materials

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• 作者：Youlin Zhang ; Pengtao Jing ; Qinghui Zeng ; Yajuan Sun ; Huaipeng Su ; Y. Andrew Wang ; Xianggui Kong ; Jialong Zhao ; Hong Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：February 5, 2009
• 年：2009
• 卷：113
• 期：5
• 页码：1886-1890
• 全文大小：192K
• 年卷期：v.113,no.5(February 5, 2009)
• ISSN：1932-7455

文摘

Photoluminescence quenching of colloidal CdSe core/shell quantum dots (QDs) with CdS, ZnS and CdS/CdZnS/ZnS shells in the presence of hole-transporting materials (HTMs) is studied by means of steady-state and time-resolved photoluminescence spectroscopy. Static quenching is surprisingly found to play an even more important role in the PL quenching process than the dynamic one originating from a hole transfer from QDs to HTMs. The static quenching efficiency of the QDs with single CdS shells of 3 and 6 monolayers is much larger than that of the QDs with a multilayer CdS/CdZnS/ZnS shell. The experimental results are important for understanding the control of the static quenching pathways in QDs by using multishell structures.