Dy 3+ -doped double perovskite Sr 2 ZnWO 6 nanophosphors were successfully synthesized via a hydrothermal route. X-ray diffraction analysis confirms the formation of a single-phase cubic structure with Fm 3̅ m space group, and Williamson-Hall analysis reveals the presence of compressive lattice strain in the doped system. FTIR spectra corroborate the characteristic vibrational modes associated with the Sr-O, Zn-O, and W-O bonds, confirming the phase formation. Field-emission scanning electron microscopy indicates agglomerated particles with a nearly uniform surface morphology. Optical band gap values were estimated using Tauc plots, assuming a direct band gap transition and observed to be in the range of ∼3.16 to 3.27 eV. Photoluminescence investigations demonstrate an intense yellow emission centered at 573 nm, attributed to the 4 F 9/2 → 6 H 13/2 transition of Dy 3+ ions, under both 295 nm and 355 nm excitations. Dy 3+ concentration-dependent studies reveal effective color tunability for 1, 3, and 5 at% doping levels. Notably, under 355 nm excitation, the 5at% Dy 3+ -doped Sr 2 ZnWO 6 sample exhibits optimal luminescence performance with a high color purity of ∼79% and a correlated color temperature (CCT) of ∼4840 K. Study reveals the multicolor wavelength tunability under UV excitation and near UV excitation generates the white light emission for light emitting diode application.
Gade et al. (2026) studied this question.