Crystal structure and luminescence properties of the barium europium tetragermanate Ba2Eu2Ge4O13

摘要： The tetragermanate Ba2Eu2Ge4O13 was synthesized for the first time, and its structural and luminescent properties were examined. It crystallizes in a monoclinic system (space group C2/c, Z = 4) and its crystal structure incorporates a unique linear [Ge4O13]10– anion. The photoluminescence spectrum of the sample ( llllex = 280 nm) contains several intense peaks in the orange-red spectral range corresponding to the 4f–4f transitions in Eu3+ ions.