Abstract
The most effective process parameters were determined to synthesize spherical LaF3 nanoparticles with controllable size based on ethylenediaminetetraacetic acid (EDTA) via co-precipitation technique. Thermogravimetricdifferential thermal analysis, X-ray diffraction, scanning electron microscopy, dynamic light scattering and FT-IR spectroscopy were used to characterize the resulting powders. Detailed investigations revealed that the optimal LaF3 host nano-material was obtained when NH4F was used as a fluoride source in the presence of EDTA at pH = 5. Furthermore, photoluminescence spectra showed an intense double emission peak at 289 and 302 nm for cerium-doped LaF3 nanocrystals excited at 253 nm, which was assigned to the well-known 5d→4f (2F5/2 and 2F7/2) transitions of Ce3+ levels due to luminescence center mechanism. The experimental results indicate that the synthesized LaF3:0.05Ce powders with a band gap of 5.3 eV are promising phosphors for high density scintillators.
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Tabatabaee, F., Sabbagh Alvani, A.A., Sameie, H. et al. Ce3+-doped LaF3 nanoparticles: Wet-chemical synthesis and photo-physical characteristics “optical properties of LaF3:Ce nanomaterials”. Met. Mater. Int. 20, 169–176 (2014). https://doi.org/10.1007/s12540-014-1012-2
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DOI: https://doi.org/10.1007/s12540-014-1012-2