Electroluminescence and thermal radiation from metallic armchair carbon nanotubes with defects

Bias-induced light emission and thermal radiation from conducting channels of carbon nanotubes (CNTs) with defects are studied theoretically within the framework nonequilibrium Green's function method based on a tight-binding model. Localized states induced by single vacancy defect Stone-Wales in low energy range enhance electroluminescence significantly while they reduce under zero bias. The influence diameters CNTs is discussed. Different 2D or bulk materials, intensities quasi-one-dimensional metallic equilibrium much smaller than that black-body radiation. We attribute this to confinement excitation transverse direction CNT. Our study important for optoelectronic applications defects.