Abstract
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 5D0→7F2 transition. In addition, the time-resolved 5D0→7F2 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 (Ω2, Ω4) were calculated from the emission spectra for various concentration of Eu3+. Using the parameters Ω2 and Ω4, the radiatives properties such as the total transition probabilities (A), the stimulated emission cross-sections (σe) and the fluorescence branching ratio (βR) relatives to 5D0→7F2 transition were predicted theoretically. The predicted lifetime (τr) calculated by using J–O method and the measured lifetime (τmea) determined experimentally for the 5D0 level, were compared and discussed. Compared to reported materials, the radiative properties obtained for 5D0→7F2 transition suggest that the present material can be used as candidate for the development of color display devices.