Structural and optical study of zns nanoparticles doped with different concentration of co

Abstract

Zinc Sulfide is an II–VI semiconductor material which subjected to study due to their size and shape dependent optical characteristics. Zinc Sulfide particles which size is in nanometer range follow the quantum confinement phenomenon. The whole II–VI semiconducting family is important but among the family ZnS, CdS, ZnO, CdTe are foremost candidate because of optical and electronic properties. Synthesis of ZnS nanoparticles pristine and doped with different concentration (wt%) of Co has been done using chemical co-precipitation method. Novel luminescence characteristics, such as, stable and visible-light emission with different colors were observed from doped ZnS nanocrystals at room temperature. Co is interest of working as a dopant due to showing a novel luminescence characteristics. XRD and TEM analysis has been done for structural studies. Peak broadening in XRD analysis shows grain size is in nanometer range. Average particle size has been calculated by Scherer Equation is in nanometer range. TEM analysis confirms nanometer size of particles. A slight shifting in photoluminescence emission peak was observed with the Co concentration. UV-visible spectrophotometer measurements has been done for band gap determination. Increase in band gap is observed as with increase in dopant concentration due to quantum confinement. Enhance optical properties of ZnS can be modulated and used in LEDs and LCDs.