Journal
NANO LETTERS
Volume 9, Issue 5, Pages 2010-2014Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl9002798
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Funding
- DFG [HA4405/4-1]
- Nanosystem Initiative Munchen (NIM)
- U.S. National Science Foundation [DMR-0520513, EEC-0647560, DMR-0706067]
- School of Graduate Studies G. Galilei (University of Pisa)
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We show that new low-energy photoluminescence (PL) bands can be created in the spectra of semiconducting single-walled carbon nanotubes by intense pulsed excitation. The new bands are attributed to PL from different nominally dark excitons that are brightened because of a defect-induced mixing of states with different parity and/or spin. Time-resolved PL studies on single nanotubes reveal a significant reduction of the bright exciton lifetime upon brightening of the dark excitons. The lowest-energy dark state has longer lifetimes and is not in thermal equilibrium with the bright state.
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