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Co:ZnS nanostructures, in which Co ions are incorporated into ZnS lattice by replacing Zn sites,have been synthesized by simple solvothermal methods using mixed solvents of water and ethylenediamine.Through modifying the amount of ethylenediamine in solvent, quasi-spherical shape with different dispersity and nanorod shape Co:ZnS nanostructures are obtained, which possess visible photoluminescence and intrinsic ferromagnetism.It is observed that the photoluminescence and ferromagnetism of the Co:ZnS nanostructures are closely related to the morphology.Photoluminescent spectra of the Co:ZnS nanostructures exhibit strong multiple emission peaks involving different defect-related luminescence centers.The intensity of the emission peaks strongly depends on the amount of structural defects in nanostructures with different morphologies.Simultaneously, the observed ferromagnetism varies with the morphologies of the nanostructures, which can be attributed to the change in the number of structural defects.Bound magnetic polaron mechanism is adopted to explain the mechanism of the intrinsic ferromagnetism in this system.