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The yttrium oxide chloride oxoselenate(IV) Y 3 O 2 Cl[SeO 3 ] 2 , doped with Eu 3+  at 3% mass percentage, can be obtained by common solid-state reactions from Y 2 O 3 , Eu 2 O 3 , YCl 3  and SeO 2 , and crystallizes isostrucäturally with the analogous terbium(III) compound Tb 3 O 2 Cl[SeO 3 ] 2 . The orthorhombic crystal structure ( Pnma ,  a  = 548.24(4),  b  = 1457.92(9),  c  = 1102.83(7) pm and  Z  = 4 for undoped yttrium samples) was identified by single-crystal X-ray diffraction data and the purity of the product was checked with powder XRD methods. The presence of isolated pyramidal [SeO 3 ] 2–  units could be confirmed by  Raman  spectroscopy. The optical band gap was determined by diffuse reflectance spectroscopy (DRS) applying the  Kubelka-Munk  function. Fluorescence spectroscopy measurements revealed the prominent  f  →  f -transitions for Eu 3+ -doped compounds in both the excitation and the emission spectra of Y 3 O 2 Cl[SeO 3 ] 2  : Eu 3+ .

Synthesis, crystal structure and spectroscopic properties of Y 3 O 2 Cl[SeO 3 ] 2 : Eu 3+