Photoluminescence of ZnO nanoparticles and nanorods

The photoluminescence (PL) of temperature-dependent of ZnO nanoparticles and nanorods prepared following a sol-gel preparation method is investigated. The size and shape of the nanostructures used are shown to influence the luminescence properties both in the near ultraviolet and visible domain. A strong emission is observed at 528 nm that are associated with the presence of surface defects on the nanoparticles. Similarly, an emission band in visible range about 514nm is also observed for ZnO nanorods. At the same time an excitonic emission peak shift from 369 nm to 374 nm during increasing of temperature from 101< to 300 K for ZnO nanoparticles, then for ZnO nanorods the excitonic band shift from 371 nm to 381 nm for same change process of temperature. (C) 2015 Elsevier GmbH. All rights reserved.