The physical properties of a doped semiconductor nanocrystals (NCs) are strongly influenced by the dopant site inside the host lattice, which determines the host–dopant coupling from the overlap between the dopant and exciton wavefunctions of the host lattice. Although several synthetic methodologies have been developed for introducing dopants inside the size-confined semiconductor NCs, the controlled dopant-host lattice coupling by dopant migration is largely unexplored. In this work, the effect of lattice mismatch of core/shell NCs (including CdS/ZnS and ZnSe/ZnS core/shell NCs) on Mn(II) dopant behavior was studied. It was found that the dopant migration toward the alloyed interface of core/shell NCs is a thermodynamically driven process to minimize the lattice strain within the NCs. The dopant migration rate could be represented by the Arrhenius equation and therefore can be controlled by the temperature and lattice mismatch. Furthermore, the energy transfer between host NCs and dopants can be finely turned in a wide range by dopant migration toward the alloyed interface during ZnS shell passivation, which provides an efficient method to control both the number of the emission band and the ratio of the emission from the host lattice and dopant ions.<br/>

Controlled dopant migration in core/shell semiconductor nanocrystals

256th National Meeting (2018)

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