| 摘要 |
An alpha-sialon is offered which is represented by general formula: (M1)<SUB>X </SUB>(M2)<SUB>Y </SUB>(Si, Al)<SUB>12 </SUB>(O, N)<SUB>16 </SUB>(wherein M1 represents one or more elements selected from the group which consists of Li, Mg, Ca, Y and lanthanoid (except La and Ce) and M2 represents one or more elements selected from the group which consists of Ce, Pr, Eu, Tb, Yb and Er and wherein 0.3<X+Y<1.5 and 0<Y<0.7), the alpha-sialon containing from 30 ppm to 1% of fluorine as an impurity. By making primary particles of the alpha-sialon 1 to 10 mum in average particle size, an alpha-sialon phosphor can be obtained reproducibly, stably and in a large quantity. Especially, if containing 30 to 200 ppm of impurity fluorine, the alpha-sialon phosphor can exhibit an excellent emission characteristic as a white fluorescent matter.
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