Multicolor Luminescence from Transition Metal Ion (Mn2+ and Cu2+) Doped ZnS Nanoparticles
Mn and Cu doped ZnS nanoparticles in powder form were prepared by a simple solvothermal route. Particle size and crystal structure of the products were investigated through X-ray diffraction study revealing the formation of cubic ZnS nanoparticles of average diameter 2.5 nm. Particle size was also verified by the high resolution transmission electron microscopic images. Blue emission at ∼445 nm was observed from the undoped sample, which was attributed to the presence of large surface defects. With increasing doping concentration the defect related emission gradually quenches and subsequently the impurity related emissions appeared. Mn doped samples exhibited orange emission at ∼580 nm which may be attributed to the transition between 4T1 and 6A1 energy levels of the Mn2+ 3d states. Whereas, the Cu doped ZnS nanoparticles exhibited a red shifted strong blue emission at ∼466 nm which is attributed to the transition of the electrons from the surface states to the 't2' levels of Cu impurities.
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Document Type: Research Article
Publication date: 2007-10-01
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