Pure and rare-earth ion (Dy^(3+)) doped TiO_2 nanomaterials were prepared through a chemical coprecipitation method. The chemical composition, micro structure and optical properties were characterized using X-ray diff...Pure and rare-earth ion (Dy^(3+)) doped TiO_2 nanomaterials were prepared through a chemical coprecipitation method. The chemical composition, micro structure and optical properties were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy and photo luminescence (PL). XPS analysis reveals that Dy^(3+)ions are preferentially occupied in the TiO_2 crystallite lattices. Both the XRD and TEM analyses confirm that both the pure and Dy doped TiO_2 are in pure anatase phase and in nano size range, respectively. Also it is found that the maximum solubility limit for Dy^(3+) ions is found to be 0.4%in TiO_2 matrix, above which it occupies interstitials and/or crystallite surface of TiO_2 nanocrystals. From the UV-Vis spectroscopy studies it is found that Dy doping induces blue shift in TiO_2. From the PL analysis it is found that doping Dy^(3+) improves the luminescence behavior in comparison with the pure TiO_2 nanoparticles.Overall, doping very low concentrations of Dy^(3+) greatly alters the structural morphology and directly increases the luminescence behavior of TiO_2 suitable for advanced optoelectronic applications.展开更多
基金supported by the DST(SERB)New Delhi through major research project(SR/S2/CMP/-0069/2012)
文摘Pure and rare-earth ion (Dy^(3+)) doped TiO_2 nanomaterials were prepared through a chemical coprecipitation method. The chemical composition, micro structure and optical properties were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy and photo luminescence (PL). XPS analysis reveals that Dy^(3+)ions are preferentially occupied in the TiO_2 crystallite lattices. Both the XRD and TEM analyses confirm that both the pure and Dy doped TiO_2 are in pure anatase phase and in nano size range, respectively. Also it is found that the maximum solubility limit for Dy^(3+) ions is found to be 0.4%in TiO_2 matrix, above which it occupies interstitials and/or crystallite surface of TiO_2 nanocrystals. From the UV-Vis spectroscopy studies it is found that Dy doping induces blue shift in TiO_2. From the PL analysis it is found that doping Dy^(3+) improves the luminescence behavior in comparison with the pure TiO_2 nanoparticles.Overall, doping very low concentrations of Dy^(3+) greatly alters the structural morphology and directly increases the luminescence behavior of TiO_2 suitable for advanced optoelectronic applications.
