Abstract
A photoluminescence study of ZnO nanorods prepared using a hydrothermal method was performed in air and vacuum ambient. It was found that UV illumination in vacuum gives rise to appearance of a violet emission band at ~ 405 nm (3.06 eV) and increase in the near band edge emission intensity. The violet emission vanishes after exposure to air, but restoring the PL spectrum's initial form requires a long time (> 44 h). The violet emission band is attributed to zinc vacancy defects formed from the hydrogen passivated VZn-H centers due to UV illumination in vacuum. The impact of the ambient conditions on the PL spectrum and intensity indicates that, it is likely, the UV illumination in vacuum also gives rise to desorption of surface oxygen and reducing the surface depletion width, which lead to blocking the non-radiative recombination channels.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
