| 摘要 |
An ± -sialon is offered which is represented by general formula: (M1) X (M2) Y (Si, Al) 12 (O, N) 16 (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 ± -sialon containing from 30 ppm to 1 % of fluorine as an impurity. By making primary particles of the ± -sialon 1 to 10 µm in average particle size, an ± -sialon phosphor can be obtained reproducibly, stably and in a large quantity. Especially, if containing 30 to 200 ppm of impurity fluorine, the ± -sialon phosphor can exhibit an excellent emission characteristic as a white fluorescent matter.
|
