Efficient near-infrared up-conversion photoluminescence in carbon nanotubes

Naoto Akizuki, Shun Aota, Shinichiro Mouri, Kazunari Matsuda and Yuhei Miyauchi ()
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Naoto Akizuki: Institute of Advanced Energy, Kyoto University
Shun Aota: Institute of Advanced Energy, Kyoto University
Shinichiro Mouri: Institute of Advanced Energy, Kyoto University
Kazunari Matsuda: Institute of Advanced Energy, Kyoto University
Yuhei Miyauchi: Institute of Advanced Energy, Kyoto University

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9920

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