Auger-Assisted Ultrafast Fluorescence Measurement of Semiconductor Single-Walled Carbon Nanotubes

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• 作者：Fengrui Hu ; Zengle Cao ; Zheng Hua ; Qinfeng Xu ; Ming Zheng ; Chunfeng Zhang ; Xiaoyong Wang ; Min Xiao
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：3
• 期：8
• 页码：1415-1420
• 全文大小：522K
• 年卷期：0
• ISSN：2330-4022

文摘

In the Auger process of a semiconductor nanostructure, the recombination energy of higher-order excitons would be nonradiatively transferred to the lower-order ones, and only the last exciton left could emit a photon. Here we show that this exciton–exciton annihilation effect can be positively employed to develop a novel optical technique for ultrafast fluorescence measurement. Upon excitation with two laser pulse trains continuously delayed in time, the fluorescence intensity of semiconductor single-walled carbon nanotubes increases accordingly, with two lifetime components of several and tens to hundreds of picoseconds being clearly resolved.