abstract |
A fluorescent substance of the following general formula:n Ln X A 1-X PO 4 nwherein Ln represents at least one element selected from the group consisting ofnNd, Yb and Er; A represents at least one element selected from the groupnconsisting of Y, La, Gd, Bi, Ce, Lu, In and Tb; and X represents a value within thenrange of 0.01 to 0.99. |