Structural and luminescence properties of (Ba1-xEux)MoO4 powders

Eu3+ doped BaMoO4 powders were prepared by solid state reaction method with various of Eu3+ concentrations. The structural and optical behaviors of the prepared samples were studied. The XRD results indicate that all Eu3+ doped BaMoO4 samples crystallize in a tetragonal structure and exhibit a good crystallinity. Photoluminescence (PL) spectra show that Eu3+ ions emit highly in the red region assigned as the D-5(O)-> F-7(2) transition. In addition, the time-resolved D-5(O)-> F-7(2) transition presents a single exponential decay behavior, revealing that the decay mechanism is a single decay component between Eu3+ ions only. The concentration dependency of PL intensity was investigated. The quenching of the PL intensity occurs at the Eu3+ concentration above 0.5%. The temperature dependency of PL intensity was investigated for BaMoO4:Eu (0.5%) and the activation energy was determined. Based on the Judd Ofelt theory (J-O), the J-O parameters (Omega(2,) Omega(4)) were calculated from the emission spectra for various concentration of Eu3+. Using the parameters Omega(2,) and Omega(4), the radiatives properties such as the total transition probabilities (A), the stimulated emission cross-sections (sigma(e)) and the fluorescence branching ratio (PR) relatives to D-5(O)-> F-7(2) transition were predicted theoretically. The predicted lifetime (tau(r)) calculated by using J-O method and the measured lifetime (tau(mea)) determined experimentally for the D-5(O)-> F-7(2) level, were compared and discussed. Compared to reported materials, the radiative properties obtained for D-5(O)-> F-7(2) transition suggest that the present material can be used as candidate for the development of color display devices. (C) 2016 Elsevier B.V. All rights reserved.