C 2012 American Chemical Society Electroluminescence in Aligned Arrays of Single-Wall Carbon Nanotubes with Asymmetric Contacts

ast work suggests that single-wall car-bon nanotubes (SWNTs) have promise as nanoscale light sources, in which emission occurs by electronhole recombi-nation (EHR).1 Electroluminescence (EL) in SWNTs senses environmental changes,1 co-rrelates to strongly bound excitons,2,3 and moves along the length of SWNT with ap-plied bias,47 all with emission wavelengths that depend on the SWNT diameter.1,8 This unique combination of optoelectronic pro-perties might make SWNT light emitters interesting for certain applications that can-not be addressed in any other way.1,9,10 Traditionally, EL in SWNTs is achieved usin