Crystallographic and Spectroscopic Characterization of Ln3+-Doped Ba(Mo,W)O4 (BMW)

The development of rare-earth-doped inorganic phosphors has attracted great interest due to their potential applications in photonics, optical devices[1], and NEAR-IR VIS sensors for theranostics. In this work, BaMO₄:Ln³⁺ (Ln:Nd, Eu and Tb) (M = Mo, W) and mixed BaMoWO₄:Ln³⁺ phosphors were synthesized via a coprecipitation method under ambient conditions with Ln³⁺ concentrations ranging from 2 to 10 mol%. The structural properties of the synthesized materials were investigated through X-ray diffraction (XRD), confirming the formation of a stable scheelite-type crystalline structure without phase segregation. The Rietveld refinement analysis further validated the phase purity and structural integrity of the obtained compounds. Scanning Electron Microscopy (SEM) revealed nanometric particles with morphology variation according to Ln³⁺ content. The optical properties of the prepared phosphors were systematically analyzed using diffuse reflectance UV-Vis spectroscopy and Raman spectroscopy.