Saturation of the Photoluminescence at Few-Exciton Levels in a Single-Walled Carbon Nanotube under Ultrafast Excitation

被引:56
作者
Xiao, Y. -F. [1 ]
Nhan, T. Q. [1 ]
Wilson, M. W. B. [1 ]
Fraser, James M. [1 ]
机构
[1] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
FLUORESCENCE; DYNAMICS;
D O I
10.1103/PhysRevLett.104.017401
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Single air-suspended carbon nanotubes (length 2-5 mu m) exhibit high optical quantum efficiency (7-20%) for low intensity resonant pumping. Under ultrafast excitation (150 fs), emission dramatically saturates at very low exciton numbers (2-6), which is attributed to highly efficient exciton-exciton annihilation over micron-length scales. Similar saturation behavior for 4 ps pulse excitation shows nonlinear absorption is not a contributing factor. The absorption cross sections (0.6-1.8 X 10(-17) cm(2)/atom) are determined by fitting to a stochastic model for exciton dynamics.
引用
收藏
页数:4
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