Network Structure and Luminescent Properties of ZnO-B 2 O 3 -Bi 2 O 3 -WO 3 :Eu 3+ Glasses.

In this study, we investigated the influence of Bi 2 O 3 and WO 3 on both structure and optical properties of 50ZnO:(49 - x)B 2 O 3 :1Bi 2 O 3 :xWO 3 ; x = 1, 5, 10 glasses doped with 0.5 mol% Eu 2 O 3 . IR spectroscopy revealed the presence of trigonal BØ 3 units connecting superstructural groups, [BØ 2 O] - metaborate groups, tetrahedral BØ 4 - units in superstructural groupings (Ø = bridging oxygen atom), borate triangles with nonbridging oxygen atoms, [WO 4 ] 2- tetrahedral, and octahedral WO 6 species. Neutron diffraction experimental data were simulated by reverse Monte Carlo modeling. The atomic distances and coordination numbers were established, confirming the short-range order found by IR spectra. The synthesized glasses were characterized by red emission at 612 nm. All findings suggest that Eu 3+ doped zinc borate glasses containing both WO 3 and Bi 2 O 3 have the potential to serve as a substitute for red phosphor with high color purity.