Abstract
The nanoshell architectures demonstrate the unique characteristics for the promising optical gain medium and lasing applications; this is investigated here using the atomistic tight-binding model. The electronic and optical characteristics of CdSbulk/CdSe nanoshells and CdSbulk/CdSe/CdS quantum-well nanoshells with experimentally synthesized structures are determined. The atomistic signatures are sensitive with nanoshell architectures and thickness of CdSe layer. The optical band gaps become narrow with the increasing CdSe layer thicknesses due to the large quantum-confinement volume. The optical band gaps of the tight-binding theory are in the excellent consistency with the experimental observation. Encapsulating CdSe layers on CdSbulk/CdSe nanoshells mainly promote the optical properties. The electron-hole pair is comfortably generated in CdSbulk/CdSe/CdS quantum-well nanoshells with large CdSe layers. The enhancement of stokes shift and radiative lifetimes is informed with the increasing CdSe layer thicknesses. The stokes shift and radiative lifetimes of CdSbulk/CdSe/CdS quantum-well nanoshells are greater than those of CdSbulk/CdSe nanoshells.
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