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Interplay of spectral diffusion and phonon-broadening in single photo-emitters : the case of carbon nanotubes

Abstract

At cryogenic temperatures, the photoluminescence (PL) spectrum of nano-emitters may still be significantly broadened due to interactions with the environment. The interplay of spectral diffusion (SD) and phonon broadening in this context is still a debated issue. Single Wall Carbon Nanotubes (SWNTs) are a particularly relevant system to address this topic as they display intense spectral diffusion and undergo a high exciton-phonon coupling due to their one-dimensional geometry. Here, we investigate quantitatively the correlations between the spectral diffusion of the main line and the wings in SWNTs and demonstrate that the photoluminescence spectrum undergoes spectral jumps as a whole, without distortions. This behavior suggests that the spectral shape of SWNTs PL is defined by exciton-phonon interactions and that spectral diffusion results in an additional flat broadening. The methodology developed here can be used to investigate a broad range of non-Lorentzian emitters undergoing spectral diffusion.

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Publication details

The article was received on 08 Aug 2017, accepted on 29 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR05861F
Citation: Nanoscale, 2017, Accepted Manuscript
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    Interplay of spectral diffusion and phonon-broadening in single photo-emitters : the case of carbon nanotubes

    A. Jeantet, Y. Chassagneux, T. Claude, J. S. Lauret and C. Voisin, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05861F

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