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

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A UV-excited red light emitting material comprises a fluoride single crystal represented by the chemical formula M1-xRExF2+x-w (in the chemical formula : M is at least one group 2 metal element selected from the group consisting of Be, Mg, Ca, Sr, and Ba; RE is a rare-earth element; 0 < x ≤0.4; and 0 ≤ w ≤ 0.5).