The yttrium oxide chloride oxoselenate(IV) Y3O2Cl[SeO3]2, doped with Eu3+ at 3% mass percentage, can be obtained by common solid-state reactions from Y2O3, Eu2O3, YCl3 and SeO2, and crystallizes isostrucäturally with the analogous terbium(III) compound Tb3O2Cl[SeO3]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 [SeO3]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 Eu3+-doped compounds in both the excitation and the emission spectra of Y3O2Cl[SeO3]2 : Eu3+.
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