Synthesis and photoluminescence of BaMgAl10O17:Eu2+ phosphor by oxalate co-precipitation process

Single phase of Ba1-xMgAl10O17 : xEu(2+) (0.02 <= x <= 0.14) phosphors was first successfully prepared by co-precipitation in aqueous medium with a "reverse strike" method, using oxalic acid and ammonia together as precipitants. Completely crystallized phosphors were obtained at 1300 degrees C, which is 300 degrees C lower than the temperature of solid-state reaction. Their photoluminescence was investigated under UV and VUV region, respectively. The emission spectra of Ba1-x MgAl10O17: xEu(2+) samples excited by 254 or 147 nm showed a characteristic wide band with the peak centred at about 450 similar to 454 nm. Optimum emission intensity reached at x = 0. 1 and then concentration quenching occurred. The synthesized phosphor shows 10% higher emission intensity than that prepared by solid-state reaction.