Carbon nanotube photo- and electro-luminescence in longitudinal electric fields

M. Freitag, M. Steiner, A. Naumov, J.P. Small, A.A. Bol, V. Perebeinos, Ph. Avouris

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    The photoluminescence of a partially suspended, semiconducting carbon nanotube that forms the active channel of a field-effect transistor is quenched and red-shifted upon application of a longitudinal electrical (source-drain) field. The quenching can be explained by a loss of oscillator strength and an increased Auger-like nonradiative decay of the E11 exciton. The spectral shifts are due to drain-field-induced doping that leads to enhanced dielectric screening. Electroluminescence due to electron impact excitation of E11 excitons is red-shifted and broadened with respect to the zero-field photoluminescence. A combination of screening and heating of the carbon nanotube can explain both spectral shift and broadening of the electrically induced light emission.
    Original languageEnglish
    Pages (from-to)3744-3748
    JournalACS Nano
    Issue number11
    Publication statusPublished - 2009


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