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Title: Efficient near-infrared up-conversion photoluminescence in carbon nanotubes
Authors: Akizuki, Naoto
Aota, Shun
Mouri, Shinichiro
Matsuda, Kazunari  kyouindb  KAKEN_id
Miyauchi, Yuhei  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 松田, 一成
宮内, 雄平
Keywords: Physical sciences
Materials science
Optical physics
Physical chemistry
Issue Date: 16-Nov-2015
Publisher: Nature Publishing Group
Journal title: Nature communications
Volume: 6
Thesis number: 8920
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.
Description: カーボンナノチューブの新しい光機能「アップコンバージョン発光」を発見 -生体組織内部の近赤外光イメージング応用に期待-. 京都大学プレスリリース. 2015-11-17.
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
DOI(Published Version): 10.1038/ncomms9920
PubMed ID: 26568250
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