MOREIRA, RENAN P.FRANCISCO, LEONARDO H.C.COSTA, ISRAEL F.BARBOSA, HELLIOMAR P.TEOTONIO, ERCULES E.S.FELINTO, MARIA C.F.C.MALTA, OSCAR L.BRITO, HERMI F.2023-04-192023-04-192023MOREIRA, RENAN P.; FRANCISCO, LEONARDO H.C.; COSTA, ISRAEL F.; BARBOSA, HELLIOMAR P.; TEOTONIO, ERCULES E.S.; FELINTO, MARIA C.F.C.; MALTA, OSCAR L.; BRITO, HERMI F. Luminescence properties of BaMO4:Eu3+ (M: Mo or W) phosphors derived from co-precipitation reaction. <b>Journal of Alloys and Compounds</b>, v. 937, p. 1-11, 2023. DOI: <a href="https://dx.doi.org/10.1016/j.jallcom.2022.168408">10.1016/j.jallcom.2022.168408</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/33986.0925-8388http://repositorio.ipen.br/handle/123456789/33986Luminescent BaMO4:xmol%Eu3+ materials (M: Mo or W, and x: 0, 2, 4, 6, 8, and 10 mol%) were successfully obtained by a coprecipitation method at room temperature without additional thermal treatment, leading to highly crystalline materials with reduced reaction times and low manufacturing cost. Structural analyses by powder X-ray diffraction and vibrational Raman techniques of the [WO4]2- and [MoO4]2- groups confirm a characteristic scheelite-type structure. The results indicate an average crystallite size at around 30 nm, and a highly pure phase has been supported by Rietveld refinement. SEM-EDS data of BaMO4:xmol%Eu3+ materials identified polycrystalline particles with bipyramidal-like morphology and homogeneous europium ion distribution. Additionally, the band gap energy (Eg) of barium molybdate and tungstate materials were calculated from reflectance data by the single-constant Kubelka-Munk function. Furthermore, the emission intensity, lifetime, and intrinsic emission quantum yield (Q Eu3+/Eu3+) of the materials have been determined and discussed. The luminescent properties of these materials are significantly influenced by the LMCT excitation bands (O2- → Mo6+, W6+, and Eu3+) as well as their intense red emission bands assigned to Eu3+ transitions. The experimental intensity parameter values Ω2 and Ω4 were evaluated from the emission spectra, using the magnetic dipole 5D0 → 7F1 transition as the standard reference. It was observed that the Ω2 values are much higher than the Ω4 values. This result is related to the fact that the 5D0 → 7F2 transition presents a much higher intensity than 5D0 → 7F1 one suggesting a low local symmetry around the Eu3+ ion, which might be due to angular distortions in the local coordination geometry. The high Q Eu3+/Eu3+ values (60–79%) indicated an overall high emission intensity for the prepared phosphors. These are special photonic features of the Eu3+-doped molybdate and tungstate, suggesting they could be suitable for luminescent materials applications.1-11openAccessluminescenceeuropiumtungstatesmolybdatescoprecipitationphosphorsArtigo de periódico93710.1016/j.jallcom.2022.1684080000-0001-7028-0878https://orcid.org/0000-0001-7028-087879.592.50