White emitting phosphors based on glasses of the type 10AlF3–10TiO2–39PbO–30H3BO3–10SiO2–xEu2O3–(1−x)Tb2O3: An energy transfer study (original) (raw)

Glasses consisting of heavy metal oxides, a metal fluoride and two lanthanoid oxides (as dopants) of the type 10AlF 3 -10TiO 2 -39PbO-30H 3 BO 3 -10SiO 2 -xEu 2 O 3 -(1À x)Tb 2 O 3 were prepared as phosphors with different molar ratio x. The un-doped matrix glass was characterized by XRD and DSC techniques. Its structure was also studied by FTIR techniques that suggested the presence of B-O À , B-Ø-B, Pb-O, Al-Ø-B and Al-O À bonds as well as [BO 3 ] 3À , [BØO 3 ], [BØ 4 ], and [SiØ 4 ] structural units as well as Ln-O-Ln clusters. For the Eu 3 þ