Effect of the Addition of WO 3 on the Structure and Luminescent Properties of ZnO-B 2 O 3 :Eu 3+ Glass.

Glasses with the compositions in mol % of 50ZnO:(50 - x)B 2 O 3 :0.5Eu 2 O 3 :xWO 3 , x = 0, 1, 3, 5 and 10 were obtained by applying the melt-quenching method and investigated by Raman spectroscopy, DSC analysis and photoluminescence (PL) spectroscopy. Raman spectra revealed that tungstate ions incorporate into the base zinc borate glass as tetrahedral [WO 4 ] 2- groups, and octahedral [WØ 4 O 2 ] 2- species with four bridging and two non-bridging oxygen atoms. There are also metaborate, [BØ 2 O] - and pyroborate units, [B 2 O 5 ] 4- , in the glass networks. The glasses are characterized by good transmission in the visible region, at about 80%. Photoluminescence (PL) spectra evidenced that WO 3 is an appropriate constituent for the modification of zinc borate glass structure and for enhancing the Eu 3+ luminescent intensity. The most intense luminescence peak observed, at 612 nm, suggests that the glasses are potential materials for red emission.