Efficient near-infrared up-conversion photoluminescence in carbon nanotubes.

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 Commun

journal_title

Nature communications

authors

Akizuki N,Aota S,Mouri S,Matsuda K,Miyauchi Y

doi

10.1038/ncomms9920

subject

Has Abstract

pub_date

2015-11-16 00:00:00

pages

8920

issn

2041-1723

pii

ncomms9920

journal_volume

6

pub_type

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