Abstract
We demonstrate microscopic observations of recently discovered efficient upconversion (anti-Stokes) photoluminescence (UCPL) [Nat. Commun. 6, 8920 (2015)] of single-walled carbon nanotubes (SWNTs). UCPL images and spectra of the identical isolated SWNTs were obtained. Unlike previous observations on the SWNT ensemble, some individual SWNTs exhibit UCPL spectra coincident with Stokes PL spectra. The excitation polarization dependence of UCPL intensity indicates that the intermediate states in the upconversion process are extrinsic. These observations are likely to facilitate a comprehensive understanding of the UCPL mechanism towards the realization of highly efficient UCPL of SWNTs.
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