| 摘要 |
PROBLEM TO BE SOLVED: To provide a luminescent material usable for a white light source exhibiting high color rendering property.SOLUTION: There is provided a broad band luminescent material containing ytterbium ion as a bivalent rare earth ion as a luminescent center in a fluorinated glass containing AlFof 20 to 45 mol%, alkali earth fluorinated product of 20 to 63 mol% and fluorine of at least one kind element selected from Y, La, Gd and Lu of 3 to 25 mol%, the fluorinated glass contains 1 to 15 mol% of a halogenated compound consisting of at least one kind selected from a group consisting of Al, Ba, Sr, Ca and Mg and at least one kind selected from a group consisting of Cl, Br and I and 0.1 to 20 mol% of at least one kind of oxide selected from a group consisting of Al, Ba, Sr, Ca, Mg and Y is contained. |
