Raman spectrum & orange-yellow-light emission due to cadmium sulfide doped magnesium ions one-dimensional nanostructures

Highlights: • Cd_x Mg_1−x S multi-branched nanowires have been fabricated. • The Raman spectrum exhibited the presence of lattice defects. • One broad-band and intensive orange-yellow light emission situated at 500–800 nm is observed. • The peaks situated at 535 nm, 607 nm, and 652 nm would be originated by Mg doping to form defects in CdS. • The emission at 731 nm is attributed to trap emission. Cadmium sulfide doped magnesium ions (Cd_xMg_1−xS) one-dimensional (1D) nanostructures have been fabricated through high-temperature solid-vapor deposition process. SEM observation shows that the branched Cd_xMg_1−xS nanowires are vertically aligned over each surface of the nanowire in the radial direction. The multi-photon Raman scattering of the as-prepared samples exhibited the presence of lattice defects in the system. Due to the incorporation of the Mg dopant into CdS, the 1TO, A₁(TO), E₂^H, and 1LO Raman modes show red-shift and that of the full width at half maximum (FWHM) are broadened. The photoluminescence property shows one broad-band and intensive orange-yellow light emission. The broad-band emission situated at 500–800 nm can be divided into multi-peaks through the Gaussian fitting curves, centered at 535 nm, 607 nm, 652 nm, and 731 nm, respectively. The peaks situated at 535 nm, 607 nm, and 652 nm would be originated by Mg doping to form defects in CdS.