Photoluminescence Properties of double perovskite Sr2ZnWO6:Sm3+ nanophosphor materials synthesized through Hydrothermal process

ABSTRACT Sm 3+ -activated Sr 2 ZnWO 6 (SZW) nanophosphors were synthesized via hydrothermal synthesis. X-ray diffraction (XRD) studies confirmed the successful formation of a single-phase cubic crystal structure. The average crystallite sizes of the nanophosphors were 54, 51, 36, and 56 nm, respectively. The FTIR data confirmed the vibrations of the double-perovskite structure. SEM analysis confirmed the surface morphology of the prepared materials. UV-VIS spectroscopy was used to estimate the optical bandgaps of the materials. The optical bandgaps of Sr 2 ZnWO 6 and Sm 3+ -doped Sr 2 ZnWO 6 were 3.06, 3.01, 2.96, and 3.03 eV, respectively. The photoluminescence spectra exhibited strong yellowish-green, orange-red, and red bands, which arise from 4 G 5/2 → 6 H 5/2 (561 nm), 4 G 5/2 → 6 H 7/2 (597 nm), and 4 G 5/2 → 6 H 9/2 (643 nm) the electronic transitions of Sm 3+ ions, respectively. The International Commission on Illumination (CIE) color coordinates, correlated color temperature (CCT), and color purity of the phosphors were evaluated, revealing an orange-red emission with a high color purity of ∼87.5% for Sr 2 ZnWO 6 :1at.% Sm 3+ phosphor. The synthesized nanophosphor materials are appropriate foundations for orange-red light generation in white light-emitting diodes.