Abstract
Nanosized bismuth doped calcium sulfide (CaS:Bi) particles have been synthesized by a wetchemical co-precipitation method. The average size of the nanoparticles was found to beabout 30 nm. The particles were characterized by x-ray diffraction (XRD), transmissionelectron microscopy (TEM), UV–vis spectroscopy and fluorescence spectroscopy. Theeffect of particle size on the photoluminescence (PL) of CaS:Bi has been studied.The optimum dopant concentration was found to be 0.025 mol% of bismuth formaximum PL emission intensity. A comparative study between bulk CaS:Bi preparedby a reduction method and nanosized CaS:Bi made by the wet co-precipitationmethod has been carried out. Increase in band gap with decrease in particle size hasbeen explained on the basis of the quantum size effect. The PL intensity of thenanoparticles was found to increase to almost twice that of the bulk particles.The effect of different dopant concentrations on emission intensity has also beenstudied.
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