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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Compact Quantum Dots for Single-molecule Imaging
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Controlled Dopant Migration in CdS/ZnS Core/Shell Quantum Dots.

Elan Hofman1, Richard John Robinson1, Zhi-Jun Li1

  • 1Department of Chemistry, Syracuse University , Syracuse, New York 13244, United States.

Journal of the American Chemical Society
|June 9, 2017
PubMed
Summary
This summary is machine-generated.

Dopant migration in cadmium sulfide/zinc sulfide (CdS/ZnS) core/shell quantum dots (QDs) is a temperature-controlled process driven by lattice strain. This migration allows fine-tuning of energy transfer and emission properties in doped QDs.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Dot Research

Background:

  • Dopant site in quantum dots (QDs) critically influences physical properties via host-dopant coupling.
  • Controlled dopant-host lattice coupling through dopant migration remains an underexplored area in nanocrystal synthesis.

Purpose of the Study:

  • Investigate the impact of lattice mismatch in CdS/ZnS core/shell QDs on manganese (Mn(II)) dopant behavior.
  • Explore dopant migration as a mechanism to control host-dopant coupling and optical properties.

Main Methods:

  • Studied Mn(II) dopant behavior in CdS/ZnS core/shell QDs with varying lattice mismatches.
  • Analyzed dopant migration using thermodynamic principles and the Arrhenius equation.
  • Investigated energy transfer dynamics between CdS host and Mn(II) dopants.

Main Results:

  • Dopant migration towards the alloyed core/shell interface is thermodynamically favored to minimize lattice strain.
  • Dopant migration rate follows Arrhenius behavior, controllable by temperature and lattice mismatch.
  • Energy transfer between CdS QDs and Mn(II) dopants is tunable via dopant migration during shell passivation.

Conclusions:

  • Dopant migration is a viable strategy for controlling host-dopant interactions in core/shell QDs.
  • This method allows precise tuning of emission bands and host-dopant emission ratios.
  • The findings offer a new pathway for engineering optical properties of doped semiconductor nanocrystals.