Enhanced photoluminescence properties of Mn²⁺ doped ZnS nanoparticles

The room-temperature photoluminescence (PL) of manganese doped zinc sulphide (ZnS:Mn²⁺) nanoparticles have been investigated. These Mn²⁺ doped ZnS nanoparticles have been synthesized by chemical precipitation method at room temperature. It has been found that passivation with acrylic acid (AA) yielded higher photoluminescence intensity. So-prepared Mn²⁺ doped ZnS nanoparticles then characterized by using X-ray diffraction (XRD), Scanning electron microscope (SEM), UV-Vis spectrophotometer. The size of the particle is found to be in 4.59-5.64 nm range. The value of band gap energy has been found to be in range 3.89-4.51 eV. Room temperature photoluminescence (PL) spectrum of the undoped sample exhibit a blue emission peaked at 465 nm under UV excitation whereas the Mn²⁺ doped sample exhibits a yellow emission peaked at 574 nm under same UV excitation.