Abstract
We report the first combined photoluminescence and pump–probe measurements on single wall carbon nanotubes isolated in micelles. The bandgap photoluminescence is observed at room temperature and is concomittent with a drastic change in the photocreated carrier dynamics as compared to the one observed in usual macroscopic samples. Probing the fundamental bandgap leads to a non-exponential dynamics which is related to a lifetime distribution within the macroscopic nanotube population. Probing the second van Hove transition leads to a strong increase of the excitation lifetime which demonstrates that some non-radiative relaxation channels are quenched for isolated nanotubes. These observations constitute an important step in the understanding of the existence of photoluminescence in isolated nanotubes.
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