Synthesis and characterization of Mn doped ZnCdS core shell nanostructures QDs using a chemical precipitation route

Abstract

With advancement in time, researchers has drawn great attention in the synthesis and characterization of mono dispersed alloyed nanocomposites of II-VI compounds. Ternary semiconductor alloyed ZnCdS quantum dots (QD's) exhibit properties intermediate between those of ZnS and CdS. It shows high absorption coefficients, a composition tunable and size tunable band gap. Moreover, ZnCdS alloyed NC's display unique composition dependent properties distinct from those of their bulk counterparts. The most striking feature of the alloyed NC's nanocrystals is their unusual long time stability in emission wavelength. ZnCdS alloyed QD's at room temperature has been synthesized using chemical precipitation method. Undoped and Mn2+ doped ZnCdS QDs have been synthesized and studied. UV-visible absorption spectrum shows absorbance in the visible region and photoluminescence (PL) emission spectra of the doped ZnCdS QD's shows orange emission in comparison to weak blue emission from undoped QDs. The crystallite size is calculated from the XRD patterns. The experimental results indicate that this easy synthesis route would prove a versatile approach for the preparation of doped and undoped ZnCdS QD's.