| 摘要 |
A UV photoexcited red light-emitting material comprising a fluoride single crystal represented by the chemical formula: M 1-x RE x F 2+x-w , wherein M is at least one metal element belonging to Group 2 of the Periodic Table selected from the group consisting of Be, Mg, Ca, Sr, and Ba, RE is a rare earth element, and the relationships: 0 < x ‰¤0.4 and 0 ‰¤ w ‰¤ 0.5 are satisfied. |
