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Issue 42, 2017
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Multi-exciton emission from solitary dopant states of carbon nanotubes

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Abstract

By separating the photons from slow and fast decays of single and multi-exciton states in a time gated 2nd order photon correlation experiment, we show that solitary oxygen dopant states of single-walled carbon nanotubes (SWCNTs) allow emission of photon pairs with efficiencies as high as 44% of single exciton emission. Our pump dependent time resolved photoluminescence (PL) studies further reveal diffusion-limited exciton–exciton annihilation as the key process that limits the emission of multi-excitons at high pump fluences. We further postulate that creation of additional permanent exciton quenching sites occurring under intense laser irradiation leads to permanent PL quenching. With this work, we bring out multi-excitonic processes of solitary dopant states as a new area to be explored for potential applications in lasing and entangled photon generation.

Graphical abstract: Multi-exciton emission from solitary dopant states of carbon nanotubes

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Publication details

The article was received on 06 Sep 2017, accepted on 12 Oct 2017 and first published on 12 Oct 2017


Article type: Communication
DOI: 10.1039/C7NR06661A
Citation: Nanoscale, 2017,9, 16143-16148
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    Multi-exciton emission from solitary dopant states of carbon nanotubes

    X. Ma, N. F. Hartmann, K. A. Velizhanin, J. K. S. Baldwin, L. Adamska, S. Tretiak, S. K. Doorn and H. Htoon, Nanoscale, 2017, 9, 16143
    DOI: 10.1039/C7NR06661A

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