Cold exciton electroluminescence from air-suspended carbon nanotube split-gate devices

Electroluminescence from individual carbon nanotubes within split-gate devices is investigated. By characterizing the air-suspended nanotubes with photoluminescence spectroscopy, chirality is identified and electroluminescence peaks are assigned. We observe electroluminescence linewidths comparable to photoluminescence, indicating negligible heating and state-mixing effects. Splitgate and bias voltage dependences are consistent with emission from an electrostatically formed pn-junction. (C) 2017 Author(s).