Defect-Induced photoluminescence from dark excitonic states in individual single-Walled carbon nanotubes

Hayk Harutyunyan; Tobias Gokus; Alexander A. Green; Mark C. Hersam; Maria Allegrini; Achim Hartschuh

doi:10.1021/nl9002798

Defect-Induced photoluminescence from dark excitonic states in individual single-Walled carbon nanotubes

Hayk Harutyunyan, Tobias Gokus, Alexander A. Green, Mark C. Hersam, Maria Allegrini, Achim Hartschuh

Research output: Contribution to journal › Article › peer-review

79 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	2010-2014
Number of pages	5
Journal	Nano Letters
Volume	9
Issue number	5
DOIs	https://doi.org/10.1021/nl9002798
State	Published - May 13 2009
Externally published	Yes

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl9002798

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title = "Defect-Induced photoluminescence from dark excitonic states in individual single-Walled carbon nanotubes",

abstract = "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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AU - Harutyunyan, Hayk

AU - Gokus, Tobias

AU - Green, Alexander A.

AU - Hersam, Mark C.

AU - Allegrini, Maria

AU - Hartschuh, Achim

PY - 2009/5/13

Y1 - 2009/5/13

N2 - 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.

AB - 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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JO - Nano Letters

JF - Nano Letters

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ER -

Defect-Induced photoluminescence from dark excitonic states in individual single-Walled carbon nanotubes

Abstract

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