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Ce super(3+)-doped LaF sub(3) nanoparticles: Wet-chemical synthesis and photo-physical characteristics \optical properties of LaF sub(3):Ce nanomaterials\
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Ce super(3+)-doped LaF sub(3) nanoparticles: Wet-chemical synthesis and photo-physical characteristics \optical properties of LaF sub(3):Ce nanomaterials\
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Ce super(3+)-doped LaF sub(3) nanoparticles: Wet-chemical synthesis and photo-physical characteristics \optical properties of LaF sub(3):Ce nanomaterials\
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Journal Article
Ce super(3+)-doped LaF sub(3) nanoparticles: Wet-chemical synthesis and photo-physical characteristics \optical properties of LaF sub(3):Ce nanomaterials\
2014
Overview
The most effective process parameters were determined to synthesize spherical LaF sub(3) 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 LaF sub(3) host nano-material was obtained when NH sub(4)F 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 LaF sub(3) nanocrystals excited at 253 nm, which was assigned to the well-known 5d arrow right 4f ( super(2)F sub(5/2) and super(2)F sub(7/2)) transitions of Ce super(3+) levels due to luminescence center mechanism. The experimental results indicate that the synthesized LaF sub(3):0.05Ce powders with a band gap of 5.3 eV are promising phosphors for high density scintillators.
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