Photoluminescence clamping with few excitons in a single-walled carbon nanotube - Condensed Matter > Materials ScienceReport as inadecuate




Photoluminescence clamping with few excitons in a single-walled carbon nanotube - Condensed Matter > Materials Science - Download this document for free, or read online. Document in PDF available to download.

Abstract: Single air-suspended carbon nanotubes length 2 - 5 microns exhibit highoptical quantum efficiency 7 - 20% for resonant pumping at low intensities.Under ultrafast excitation, the photoluminescence dramatically saturates forvery low injected exciton numbers 2 to 6 excitons per pulse per SWCNT. ThisPL clamping is attributed to highly efficient exciton-exciton annihilation overmicron length scales. Stochastic modeling of exciton dynamics and femtosecondexcitation correlation spectroscopy allow determination of nanotube absorption2 - 6% and exciton lifetime 85 +- 20 ps.



Author: Y.-F. Xiao, T.Q. Nhan, M.W.B. Wilson, J.M. Fraser

Source: https://arxiv.org/



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