A ZnO thin film covered by TiO<sub>2</sub> nanoparticles is prepared by electron beam evaporation. The structure and surface morphology of the sample are analyzed by X-ray diffraction (XRD) and atomic force microscopy (AFM), respectively. Photoluminescence is used to investigate the fluorescent property of the ample. The results show that the ultraviolet (UV) emission of the ZnO thin film is greatly enhanced after it is covered by TiO<sub>2</sub> nanoparticles while the green emission is suppressed. The enhanced UV emission mainly results from the fluorescence resonance energy transfer (FRET) between ZnO thin film and TiO<sub>2</sub> nanoparticles. This TiO<sub>2</sub>-ZnO composite thin film can be used to fabricate high-efficiency UV emitters.
© 2009 Chinese Optics LettersPDF Article