Structural, Raman, FT-IR and optical properties of Rb3Y2(PO4)3 and Rb3La(PO4)2 doped with Eu3+ ions

• Main Authors: Pelczarska, Aleksandra, Watras, Adam, Godlewska, Patrycja, Radomi ska, Ewa, Macalik, Lucyna, Szczygie, Irena, Hanuza, Jerzy, Dere, Przemys aw J
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c5nj01235j

Rb 3 Y 2 (PO 4 ) 3 and Rb 3 La(PO 4 ) 2 , undoped and doped with Eu 3+ ions, were synthesised either by the Pechini method or solid state reaction. They were characterised by thermoanalytical methods, X-ray diffraction, IR and Raman spectroscopy as well as optical techniques. It was stated that Pechini and solid state reaction methods give the compounds with the same structure. The structural data result in the P 2 1 / m space group with Z = 2 and a = 9.78 Å, b = 5.76 Å and c = 7.77 Å cell parameters for Rb 3 La(PO 4 ) 2 and cubic symmetry I 2 1 /3 with a = 16.87 Å and Z = 16 for Rb 3 Yb 2 (PO 4 ) 3 . In Rb 3 La(PO 4 ) 2 the reversible β/α phase transition is observed in the 960-1070 °C temperature range. The lifetime of the 5 D 0 excited state measured at 77 K is about 4 and 2 ms for Rb 3 La(PO 4 ) 2 and Rb 3 Y 2 (PO 4 ) 3 , respectively. Rb 3 La(PO 4 ) 2 and Rb 3 Y 2 (PO 4 ) 3 doped with Eu 3+ were obtained through two different routes. The synthesis technique influences the optical properties of compounds.