Phys. Rev. B 77, 165436 (2008) [6 pages]Light-harvesting function of β-carotene inside carbon nanotubes explored by femtosecond absorption spectroscopyReceived 25 February 2008; published 30 April 2008 Single-walled carbon nanotubes (SWCNTs) encapsulating β-carotene are attractive components for enhancing optical functionalities of SWCNTs. We have investigated ultrafast dynamics of light-harvesting function of β-carotene. The relaxation kinetics of β-carotene is faster in SWCNTs than in nonpolar solvent. The absorbance change due to SWCNTs increases with the encapsulation because of excited energy transfer from β-carotene. The energy transfer rates from the 1 1Bu+ and 2 1Ag− excited states of β-carotene to SWCNTs are determined to be (50 fs)−1 and (6.6 ps)−1, respectively. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.165436
DOI:
10.1103/PhysRevB.77.165436
PACS:
78.67.Ch, 82.20.Rp, 78.47.−p
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