Synthesis and properties of rare earth doped lamp phosphors
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Red, blue and green emitting lamp phosphors such as Eu3+ doped Y2O3 (red phosphor), Eu2+ doped Ba0·64Al12O18·64, BaMgAl10O17 and BaMg2Al16O27 (blue phosphors) and Ce0·67Tb0·33MgAl11O19 and Eu2+, Mn2+ doped BaMgAl10O17 (green phosphors) have been prepared by the combustion of the corresponding metal nitrates (oxidizer) and oxalyl dihydrazide/urea/carbohydrazide (fuel) mixtures at 400°–500°C within 5 min. The formation of these phosphors has been confirmed by their characteristic powder X-ray diffraction patterns and fluorescence spectra. The phosphors showed characteristic emission bands at 611 nm (red emission), 430–450 nm (blue emission) and 515–540 nm (green emission). The fine-particle nature of the combustion derived phosphors has been investigated using powder density, particle size and BET surface area measurements.
KeywordsCombustion synthesis phosphors rare earths
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