Unlocking the potential of orange-red emission from engineered Y2WO6 phosphors with Sm3+ integration for solid-state lighting applications

Over the past few decades, phosphor-converted light-emitting diodes (pc-LEDs) have undergone significant advancements, resulting in substantial energy reductions. Considering the merits, improving the functionalities of phosphors was an igniting topic of study for the research community. In this context, the present study focuses on the synthesis of a series of Y_2–xSm_xWO₆ (x = 0.01–0.11) phosphors using a solution combustion (SC) method. X-ray diffraction (XRD) analysis of the prepared phosphors confirmed the monoclinic phase with the P2/c space group. Morphological studies revealed a rod-like morphology. Utilizing diffuse reflectance (DR) data, the energy bandgap (E_g) of the phosphors was estimated and found to be lie in the range of ~3.64–3.79 eV. Photoluminescence (PL) emission spectra exhibited three intense and sharp peaks at ~566, 604, and 656 nm, corresponding to the transitions from the ⁴G_5/2 state of Sm³⁺ ions to ⁶H_J (J = 5/2, 7/2, and 9/2) lower energy multiplets, respectively. Notably, the prepared phosphors exhibited high color purity (~99.7%), with color coordinates in the orange-red region of the Commission Internationale de l'Éclairage (CIE) diagram. This distinctive orange-red emission property highlights its potential in solid-state lighting applications.