Preparation of CaWO4:Ln@SiO2 (Ln=Tb, Dy and Ho) nanoparticles by a combustion reaction and their optical properties |
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Authors: | Mohammad Sadegh Alireza Abbasi Ghodsi Mohammadi Ziarani |
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Institution: | a School of Chemistry, College of Science, University of Tehran, Tehran, Iran b Department of Chemistry, Faculty of Science, Alzahra University, Iran |
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Abstract: | The CaWO4:Ln3+@SiO2 (Ln=Tb, Dy and Ho) nanoparticles were synthesized via a combustion process at 800 °C, using citric acid as chelating agent and fuel, ammonium nitrate as fuel, boric acid as flux material and silica as supports. The persistent phosphor nanoparticles were characterized by X-ray diffraction (XRD), reflectance UV-vis and fluorescence spectroscopy (PL) and transmission electron microscopy (TEM) techniques. XRD patterns indicated that crystalline calcium tungstate with scheelite structure was produced. The reflectance UV-vis spectra showed the broad absorption band of groups and the PL spectra showed the wide excitation band, broad emission band of and characteristic emissions of Ln3+ ions. The average particle sizes were determined by TEM, which are about 50 nm. |
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Keywords: | Nanoparticle CaWO4:Ln3+ Combustion Luminescence Scheelite crystal |
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