Network Structure and Luminescent Properties of ZnO–B2O3–Bi2O3–WO3:Eu3+ Glasses

Abstract

In this study, we investigated the influence of Bi2O3 and WO3 on both structure and optical properties of 50ZnO:(49 − x)B2O3:1Bi2O3:xWO3; x = 1, 5, 10 glasses doped with 0.5 mol% Eu2O3. IR spectroscopy revealed the presence of trigonal BØ3 units connecting superstructural groups, [BØ2O]− metaborate groups, tetrahedral BØ4− units in superstructural groupings (Ø = bridging oxygen atom), borate triangles with nonbridging oxygen atoms, [WO4]2− tetrahedral, and octahedral WO6 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 Eu3+ doped zinc borate glasses containing both WO3 and Bi2O3 have the potential to serve as a substitute for red phosphor with high color purity.

Effect of the Addition of WO3 on the Structure and Luminescent Properties of ZnO-B2O3:Eu3+ Glass

“…The increase in R value is due to the increase in asymmetry and covalency between the Eu 3+ ion and the ligands [ 41 ]. The R values of the synthesized glasses are listed in Table 3 along with other data reported in the literature about Eu 3+ -doped oxide glasses [ 6 , 13 , 34 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. The relatively higher values compared to other reported Eu 3+ -doped oxide glasses indicate that Eu 3+ occupies crystallographic sites with low symmetry and also provide evidence of the high Eu 3+ -O 2− covalency.…”