Fluorescence Enhancement, Blinking Suppression, and Gray States of Individual Semiconductor Nanocrystals Close to Gold Nanoparticles
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- 作者：Xuedan Ma ; Hua Tan ; Tobias Kipp ; Alf Mews
- 刊名：Nano Letters
- 出版年：2010
- 出版时间：October 13, 2010
- 年：2010
- 卷：10
- 期：10
- 页码：4166-4174
- 全文大小：601K
- 年卷期：v.10,no.10(October 13, 2010)
- ISSN：1530-6992
文摘
The optical properties of nanocrystals are drastically changed by the interaction with adjacent metal nanoparticles. By time-resolved photoluminescence spectroscopy, we investigate CdSe multishell nanocrystals coupled to self-assembled films of Au nanoparticles. The distance between emitter and metal is adjusted by coating the nanocrystals with silica shells. These NCs showed increased fluorescence intensity, a decreased fluorescence lifetime, strong blinking suppression, and fluorescence from gray states. These observations can be explained by the metal particle induced change of excitation and recombination rates.