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

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 01期

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

页数：4

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