Luminescence of copper nanoparticles

► Copper nanoparticles have been prepared through the reduction of copper chloride. ► TEM image shows that average size of copper nanoparticles is 11 nm. ► Ultraviolet visible spectroscopic study shows an absorption band at about 296 nm. ► Photoluminescence spectra of copper nanoparticles show an emission peak at 530 nm ►It is found that copper nanoparticles exhibit electroluminescence at 550 nm.