Effect of silica coating on the structural and luminescent properties of Sm3+/Yb3+ or Tm3+/Yb3+ co-doped TiO2 nanoparticles |
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| Affiliation: | 1. Adam Mickiewicz University, Faculty of Chemistry, Department of Rare Earths, Umultowska 89b, 61-614 Poznań, Poland;2. Institute of Low Temperature and Structure Research, Polish Academy of Science, P.O. Box 1410, 50-950 Wroclaw, Poland;3. Centre for Advanced Materials and Smart Structures, Polish Academy of Sciences, Okolna 2, 50-950 Wroclaw, Poland;1. Departamento de Física, Centro de Investigación y de Estudios Avanzados del I.P.N., A.P. 14-740, Ciudad de México, 07360, Mexico;2. Centro de Investigación y de Estudios Avanzados del I.P.N., A.P. 14-740, Ciudad de México, 07360, Mexico;3. Departamento de Química, Centro de Investigación y de Estudios Avanzados del I.P.N., A.P. 14-740, Ciudad de México, 07360, Mexico;1. Department of Ceramics and Refractories, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, A. Mickiewicza 30, 30-059 Krakow, Poland;2. Doctoral Program in Nanoscience''s and Nanotechnology, Center for Research and Advanced Studies of the National Polytechnic Institute, 2508 IPN Av., 07360 Mexico City, Mexico;3. Department of Physics, Center for Research and Advanced Studies of the National Polytechnic Institute, 2508 IPN Av., 07360 Mexico City, Mexico;4. Department of Power Engineering, Photonics and Lighting Technology, Faculty of Electrical Engineering, Bialystok University of Technology, Wiejska 45D, 15-351, Poland |
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| Abstract: | The luminescent characteristics of spherical titanium dioxide (TiO2) nanoparticles (NP's) doped with Sm3+/Yb3+ and Tm3+/Yb3+ with and without a silica coating were analyzed. These nanoparticles were synthesized using the spray pyrolysis technique and coated with silica through a wet chemical process. The Sm3+/Tm3+ and Yb3+ doping induces a triphasic poly-crystalline structure of rutile and anatase TiO2 and a Sm2Ti2O7/Tm2Ti2O7 cubic phase. A Williamson-Hall analysis was used to monitor the tensions of the NP's crystallites at the various doping concentrations and with addition of the silica shell. The luminescent spectra presented the characteristic emission peaks for the electronic energy levels transitions of the Sm3+/Tm3+ and Yb3+ ions. The Sm3+/Yb3+ co-doped NP's showed a maximum emission peak in the visible region at 612 nm, associated with 4G5/2 → 6H7/2 transitions of the Sm3+ ions. The IR emission peak at 973 nm (2F5/2 → 2F7/2) pertaining to Yb3+. For the combination of Tm3+/Yb3+, two emissions associated with Tm3+ ions were observed at 440 nm (1D2 → 3F4) and 806 nm (3H4 → 3H6). The emission at 973 nm (2F5/2 → 2F7/2) is correlated to the Yb3+ ions. Silica coating of the NP's resulted in luminescence emission intensity increase of about 4 times. |
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| Keywords: | Spray pyrolysis Nanocomposites B. Optical properties C. |
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