| 摘要 |
The present invention is directed to a Gd<SUB>2</SUB>O<SUB>2</SUB>S:M fluorescent ceramic material with a very short afterglow, wherein M represents at least one element selected from the group Pr, Th, Yb, Dy, Sm and/or Ho and the Gd<SUB>2</SUB>O<SUB>2</SUB>S:M fluorescent ceramic material comprises further: europium of <=1 wt. ppm based on Gd<SUB>2</SUB>O<SUB>2</SUB>S, and cerium of >=0.1 wt. ppm to <=100 wt. ppm based on Gd<SUB>2</SUB>O<SUB>2</SUB>S, wherein the content of cerium is in excess of the content of europium with a ratio of europium to cerium of 1:10 to 1:150.
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