Abstract:
:Photoluminescence phenomena normally obey Stokes' law of luminescence according to which the emitted photon energy is typically lower than its excitation counterparts. Here we show that carbon nanotubes break this rule under one-photon excitation conditions. We found that the carbon nanotubes exhibit efficient near-infrared photoluminescence upon photoexcitation even at an energy lying >100-200 meV below that of the emission at room temperature. This apparently anomalous phenomenon is attributed to efficient one-phonon-assisted up-conversion processes resulting from unique excited-state dynamics emerging in an individual carbon nanotube with accidentally or intentionally embedded localized states. These findings may open new doors for energy harvesting, optoelectronics and deep-tissue photoluminescence imaging in the near-infrared optical range.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Akizuki N,Aota S,Mouri S,Matsuda K,Miyauchi Ydoi
10.1038/ncomms9920subject
Has Abstractpub_date
2015-11-16 00:00:00pages
8920issn
2041-1723pii
ncomms9920journal_volume
6pub_type
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