3645287 A description ______________________________________barium oxide bao 68 85 gcalcium hydroxide ca oh sub 2 0 07magnesium hydroxide mg oh sub 2 29 17europium oxide eu sub 2 o sub 3 8 80aluminum oxide al sub 2 o sub 3 254 90silicon dioxide sio sub 2 0 06______________________________________ the above materials were mixed thoroughly the obtained mixture was sintered in air at 1 350 u00b0 c for 4 hours the sintered product was pulverized and washed with water the powder obtained by pulverization was dried and sintered in a reducing atmosphere at 1 400 u00b0 c for 4 hours finally the sintered powder was pulverized washed with water and dried again to obtain a phosphor the composition of the obtained phosphor was ba 0 449 ca 0 001 mg 0 5 eu 0 05 o 2 5al 2 o 3 0 001sio 2 the emission intensities of this phosphor under excitation by the mercury bright line of 254 nm were 110 and 120 those of conventional blue color light emitting aluminum phosphors ba eu mg 2 al 16 o 27 and ba eu o eal 2 o 3 fy 2 o 3 respectively its emission intensity after the lamp had been on for 1 000 hours was 180 that of ba eu o eal 2 o 3 fy 2 o 3 ______________________________________barium carbonate baco sub 3 39 08 gcalcium oxide cao 0 11magnesium hydroxide mg oh sub 2 40 83europium oxide eu sub 2 o sub 3.