Photoluminescence from disorder induced states in individual single-walled carbon nanotubes

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

doi:10.1002/pssb.200982273

Photoluminescence from disorder induced 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

4 Scopus citations

Abstract

We report on the generation of new low-energy photoluminescence (PL) bands in the spectra of semiconducting single-walled carbon nanotubes (SWNTs). The new bands, that are brightened because of local modifications of the nanotube structure or the metal adsorption on the SWNT surface, are attributed to PL from different nominally dark excitons that are "brightened" due to defect-induced mixing of states with different parity and/or spin. The effect of the created structural disorder on the dynamical properties of the emission is studied by time-resolved PL measurements revealing a significant reduction of the bright exciton lifetime. The lowest energy dark state has a longer lifetime and is not in thermal equilibrium with the bright state.

Original language	English (US)
Pages (from-to)	2679-2682
Number of pages	4
Journal	Physica Status Solidi (B) Basic Research
Volume	246
Issue number	11-12
DOIs	https://doi.org/10.1002/pssb.200982273
State	Published - Dec 2009
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We report on the generation of new low-energy photoluminescence (PL) bands in the spectra of semiconducting single-walled carbon nanotubes (SWNTs). The new bands, that are brightened because of local modifications of the nanotube structure or the metal adsorption on the SWNT surface, are attributed to PL from different nominally dark excitons that are {"}brightened{"} due to defect-induced mixing of states with different parity and/or spin. The effect of the created structural disorder on the dynamical properties of the emission is studied by time-resolved PL measurements revealing a significant reduction of the bright exciton lifetime. The lowest energy dark state has a longer lifetime 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 - 2009/12

Y1 - 2009/12

N2 - We report on the generation of new low-energy photoluminescence (PL) bands in the spectra of semiconducting single-walled carbon nanotubes (SWNTs). The new bands, that are brightened because of local modifications of the nanotube structure or the metal adsorption on the SWNT surface, are attributed to PL from different nominally dark excitons that are "brightened" due to defect-induced mixing of states with different parity and/or spin. The effect of the created structural disorder on the dynamical properties of the emission is studied by time-resolved PL measurements revealing a significant reduction of the bright exciton lifetime. The lowest energy dark state has a longer lifetime and is not in thermal equilibrium with the bright state.

AB - We report on the generation of new low-energy photoluminescence (PL) bands in the spectra of semiconducting single-walled carbon nanotubes (SWNTs). The new bands, that are brightened because of local modifications of the nanotube structure or the metal adsorption on the SWNT surface, are attributed to PL from different nominally dark excitons that are "brightened" due to defect-induced mixing of states with different parity and/or spin. The effect of the created structural disorder on the dynamical properties of the emission is studied by time-resolved PL measurements revealing a significant reduction of the bright exciton lifetime. The lowest energy dark state has a longer lifetime and is not in thermal equilibrium with the bright state.

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Photoluminescence from disorder induced states in individual single-walled carbon nanotubes

Abstract

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