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<p>The electronic, optical and magnetic properties of CdTe/CdS core/shell nanocrystals with different Mn-doped positions and concentrations are carried out by the empirical tight-binding model with the consideration of <i>sp</i>–<i>d</i> exchange interaction. Substitution of Mn ions into CdTe/CdS core/shell nanocrystal via desired sites and concentrations provides a way to manipulate the <i>sp</i>–<i>d</i> exchange interaction. With the growing Mn concentrations, the splitting energies and g-factor values are linearly increased. The splitting energies and g-factor values of CdTe:Mn/CdS core/shell nanoparticles are higher than those of CdTe/CdS:Mn core/shell nanoparticles. In the presence of Mn dopants, the optical spectra are divided into four components corresponding to the recombination paths. The increasing Mn concentrations display a progressive red-shift spectra. The introduction of Mn ions improves the optical property, thanks to oscillation strengths and radiative lifetimes. Overall, it is expected that this understanding of core/shell nanocrystals doped with magnetic ions can be utilized for spin-related applications.</p>

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Dependence on Mn concentration and position on the electronic, optical and magnetic properties of CdTe/CdS core/shell nanocrystals: empirical tight-binding theory

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Worasak Sukkabot

摘要

The electronic, optical and magnetic properties of CdTe/CdS core/shell nanocrystals with different Mn-doped positions and concentrations are carried out by the empirical tight-binding model with the consideration of sp–d exchange interaction. Substitution of Mn ions into CdTe/CdS core/shell nanocrystal via desired sites and concentrations provides a way to manipulate the sp–d exchange interaction. With the growing Mn concentrations, the splitting energies and g-factor values are linearly increased. The splitting energies and g-factor values of CdTe:Mn/CdS core/shell nanoparticles are higher than those of CdTe/CdS:Mn core/shell nanoparticles. In the presence of Mn dopants, the optical spectra are divided into four components corresponding to the recombination paths. The increasing Mn concentrations display a progressive red-shift spectra. The introduction of Mn ions improves the optical property, thanks to oscillation strengths and radiative lifetimes. Overall, it is expected that this understanding of core/shell nanocrystals doped with magnetic ions can be utilized for spin-related applications.