UV-EXCITED RED-LIGHT EMITTING MATERIAL, AND LIGHT EMITTING DIODE

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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.