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Synthesis and properties of $Eu^{2+}$ activated blue phosphors

Ekambaram, S and Patil, KC (1997) Synthesis and properties of $Eu^{2+}$ activated blue phosphors. In: Journal of Alloys and Compounds, 248 (1-2). pp. 7-12.

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Blue phosphors $Eu^{2+}$ activated $BaMgAl_{1O}O_{17},BaMg_2Al_{16}O_{27}, xBaO.6Al_2O_3$ where x=0.64-1.8 and $LaMgAl_{11}O_{19}$ have been prepared by the combustion of corresponding metal nitrates (oxidizer) and carbohydrazide (CH)/diformyl hydrazine (DFH)/urea (fuel) redox mixture at $400/5OO^oC$ within 5 min. The phosphors were characterized by exposure to UV light, powder XRD, fluroescence and electron paramagnetic resonance spectroscopy. The phosphors showed a characteristic emission band in the region 435-462 nm when they were excited at 254 nm. With an increase in barium content in $xBaO.6Al_2O_3$ (x = 0.64-1.8) the emission band showed a red shift. Addition of $Mn^{2+}$ in $Eu^{2+}$ doped barium hexa aluminates and $Eu^{2+}$ doped $LaMgAl_{11}O_{19}$ resulted in strong green emission at 515 nm. The fine particle nature of combustion derived phosphors has been studied by powder density (55-82% of theoretical value). particle size $(5.7-9.5 \mu m)$ and BET surface area $(5-22 m^2 g^{-1})$ measurements.

Item Type: Journal Article
Publication: Journal of Alloys and Compounds
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Phosphors;Fluorescence;X-ray diffraction
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 24 May 2007
Last Modified: 19 Sep 2010 04:36
URI: http://eprints.iisc.ac.in/id/eprint/10211

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