| abstract |
The present invention is directed to a Gd2O2S: M fluorescent ceramic material with a very short afterglow, wherein M represents at least one element selected from the group Pr, Tb, Yb, Dy, Sm and/or Ho and the Gd2O2S: M fluorescent ceramic material comprises further: europium of ≤ 1 wt. ppm based on Gd2O2S, and cerium of ≥ 0.1 wt. ppm to ≤ 100 wt. ppm based on Gd2O2S, wherein the content of cerium is in excess of the content of europium with a ratio of europium to cerium of 1 : l0 to l : 150. |