Effect of capping agent at surface modified ZnO quantum dots on photoluminescence emission spectroscopy

This report presents the results of luminescence measurements of surface modified zinc oxide quantum dots (ZnOQDs) performed in various concentrations of capping agent. Surface modification was performed at in-situ procedure on surfaceof ZnO QDs ( ̴2nm) in ultrasonic assisted process. Effect of different concentrations of capping agent on reduction of surface defectswas identified with investigation of PL spectra which was observed on exciton emission band and broad- band visible emission.The modified samples were characterized by other various analytical techniques such as XRD, TEM, and UV-Vis spectroscopy.Comparing PL spectra of modified and unmodified ZnO QDs identified effectiveness of capping agent on stability of the QDs.ZnO QDs with reduced defects and enhanced stability are of particular interest fore studies of electrical and optical properties ofzinc oxide films.

کلیدواژه ها:

Quantum dot ، Photoluminescence ، Capping agent ، Surface modification ، ZnO