SYNTHESIS AND PROPERTIES OF RARE-EARTH-DOPED LAMP PHOSPHORS

Red, blue and green emitting lamp phosphors such as EU(3+) doped Y2O3 (red phosphor), EU(2+) doped Ba0.64Al12O18.64, BaMgAl10O17 and BaMg2Al 16O27 (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/ure a/carbohydrazide (fuel) mixtures at 400 degrees-500 degrees C within 5 min. The formation of these phosphors has been confirmed by their cha racteristic powder X-ray diffraction patterns and fluorescence spectra . The phosphors showed characteristic emission bands at 611 nm (red em ission), 430-450 nm (blue emission) and 515-540 nm (green emission). T he fine-particle nature of the combustion derived phosphors has been i nvestigated using powder density, particle size and BET surface area m easurements.