10.1021/nn3025496.s001 Xu Xie Xu Xie Ahmad E. Islam Ahmad E. Islam Muhammad A. Wahab Muhammad A. Wahab Lina Ye Lina Ye Xinning Ho Xinning Ho Muhammad A. Alam Muhammad A. Alam John A. Rogers John A. Rogers Electroluminescence in Aligned Arrays of Single-Wall Carbon Nanotubes with Asymmetric Contacts American Chemical Society 2012 metal contact SWNT LEDs threshold exciton metal contacts offer Aligned Arrays devices result photon emission electroluminescence nanoscale emitters wall carbon nanotubes semiconductor light terminal geometries Asymmetric ContactsHigh quantum efficiencies 2012-09-25 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Electroluminescence_in_Aligned_Arrays_of_Single_Wall_Carbon_Nanotubes_with_Asymmetric_Contacts/2483821 High quantum efficiencies and low current thresholds are important properties for all classes of semiconductor light emitting devices (LEDs), including nanoscale emitters based on single wall carbon nanotubes (SWNTs). Among the various configurations that can be considered in SWNT LEDs, two terminal geometries with asymmetric metal contacts offer the simplest solution. In this paper, we study, experimentally and theoretically, the mechanisms of electroluminescence in devices that adopt this design and incorporate perfectly aligned, horizontal arrays of individual SWNTs. The results suggest that exciton mediated electron–hole recombination near the lower work-function contact is the dominant source of photon emission. High current thresholds for electroluminescence in these devices result from diffusion and quenching of excitons near the metal contact.