Effects of Catalyst/Ba mole fraction on the structure and luminescence properties of BaCO3:1% Eu3+,2% Dy3+ phosphors synthesized using sol-gel process.
Presented by Ms. Angelina Seithati TEBELE on 9 Jul 2014 from 17:10 to 19:00
Type: Poster Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials
Board #: A.294
BaCO3:1% Eu3+,2% Dy3+ powders were synthesized by sol-gel process at a relatively low temperature ~ 80 0C. Metal nitrates were used as the source of metal ions and citric acid as a chelating agent. The Catalyst/Ba mole fraction in the solution were varied from 1.0 - 2.5 during synthesis. The annealed powder samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy. The XRD data revealed that the annealed samples consist of orthorhombic BaCO3 with BaO impurities. Morphology of the phosphor was influence by the Catalyst/Ba mole fraction. PL spectra indicated that there are emission peaks at different wavelength positions. The most intense peak is at 616 nm, which is attributed to the 5D0-7F2 transitions of Eu3+. Keywords: Luminescence; BaCO3:1% Eu2+,2% Dy3+; Catalyst/Ba; Sol-gel
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