Low-lying exciton states determine the photophysics of semiconducting single wall carbon nanotubes

Gregory D. Scholes; Sergei Tretiak; Timothy J. McDonald; Wyatt K. Metzger; Chaiwat Engtrakul; Garry Rumbles; Michael J. Heben

doi:10.1021/jp068541j

Low-lying exciton states determine the photophysics of semiconducting single wall carbon nanotubes

Gregory D. Scholes, Sergei Tretiak, Timothy J. McDonald, Wyatt K. Metzger, Chaiwat Engtrakul, Garry Rumbles, Michael J. Heben

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

46 Scopus citations

Abstract

A combined experimental and theoretical study of the photophysical properties and excited-state dynamics of semiconducting single-wall carbon nanotubes (SWNTs) is reported. Steady-state and time-resolved fluorescence data as a function of temperature are explained on the basis of a manifold of four low-lying singlet exciton states with kinetically controlled interconversion. Relaxation among these levels is slow and therefore Kasha's rule is not obeyed. Quantum chemical calculations based on time-dependent density functional theory complement the experimental findings. The temperature-dependence of the radiative and nonradiative rate constants are examined.

Original language	English (US)
Pages (from-to)	11139-11149
Number of pages	11
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	30
DOIs	https://doi.org/10.1021/jp068541j
State	Published - Aug 2 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp068541j

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title = "Low-lying exciton states determine the photophysics of semiconducting single wall carbon nanotubes",

abstract = "A combined experimental and theoretical study of the photophysical properties and excited-state dynamics of semiconducting single-wall carbon nanotubes (SWNTs) is reported. Steady-state and time-resolved fluorescence data as a function of temperature are explained on the basis of a manifold of four low-lying singlet exciton states with kinetically controlled interconversion. Relaxation among these levels is slow and therefore Kasha's rule is not obeyed. Quantum chemical calculations based on time-dependent density functional theory complement the experimental findings. The temperature-dependence of the radiative and nonradiative rate constants are examined.",

author = "Scholes, {Gregory D.} and Sergei Tretiak and McDonald, {Timothy J.} and Metzger, {Wyatt K.} and Chaiwat Engtrakul and Garry Rumbles and Heben, {Michael J.}",

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doi = "10.1021/jp068541j",

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T1 - Low-lying exciton states determine the photophysics of semiconducting single wall carbon nanotubes

AU - Scholes, Gregory D.

AU - Tretiak, Sergei

AU - McDonald, Timothy J.

AU - Metzger, Wyatt K.

AU - Engtrakul, Chaiwat

AU - Rumbles, Garry

AU - Heben, Michael J.

PY - 2007/8/2

Y1 - 2007/8/2

N2 - A combined experimental and theoretical study of the photophysical properties and excited-state dynamics of semiconducting single-wall carbon nanotubes (SWNTs) is reported. Steady-state and time-resolved fluorescence data as a function of temperature are explained on the basis of a manifold of four low-lying singlet exciton states with kinetically controlled interconversion. Relaxation among these levels is slow and therefore Kasha's rule is not obeyed. Quantum chemical calculations based on time-dependent density functional theory complement the experimental findings. The temperature-dependence of the radiative and nonradiative rate constants are examined.

AB - A combined experimental and theoretical study of the photophysical properties and excited-state dynamics of semiconducting single-wall carbon nanotubes (SWNTs) is reported. Steady-state and time-resolved fluorescence data as a function of temperature are explained on the basis of a manifold of four low-lying singlet exciton states with kinetically controlled interconversion. Relaxation among these levels is slow and therefore Kasha's rule is not obeyed. Quantum chemical calculations based on time-dependent density functional theory complement the experimental findings. The temperature-dependence of the radiative and nonradiative rate constants are examined.

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JO - Journal of Physical Chemistry C

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Low-lying exciton states determine the photophysics of semiconducting single wall carbon nanotubes

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