INFLUENCE OF ANNEALING TEMPERATURES ON STRUCTURAL AND OPTICAL PROPERTIES OF ION Er3+ DOPED ZnO/SiO2 NANOCOMPOSITE FILMS
In this study, we report the influence of annealing temperature on morphology, microstructures, and optical properties of ion Er3+ doped ZnO–SiO2 nanocomposites thin films. Thin layers of ZnO–SiO2 nanocomposites doped with Er3+ were prepared by sol-gel method and spin-coating process. The structure and morphology of the thin films as a function of annealing temperature were studied and analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). Upon annealing temperatures at 700 oC, we observed emission peaks at around 1540 nm assigned for the 4I13/2 -4I15/2 transition of Er3+ ions. Energy transfer processes upon photon absorptions within ZnO nanocrystals and Eu3+ ions are discussed via photoluminescence spectrum in the range of excitation wavelength 325 nm.
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