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Compact Quantum Dots for Single-molecule Imaging
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Highly Luminescent and Photostable Core/Shell/Shell ZnSeS/Cu:ZnS/ZnS Quantum Dots Prepared via a Mild Aqueous Route.

Salima Mabrouk1,2, Hervé Rinnert3, Lavinia Balan4

  • 1Université de Lorraine, CNRS, LRGP, F-54000 Nancy, France.

Nanomaterials (Basel, Switzerland)
|September 23, 2022
PubMed
Summary

Copper-doped ZnSeS/ZnS quantum dots (QDs) synthesized in aqueous solution show enhanced photoluminescence. Optimal Cu-dopant placement in the ZnS shell maximizes quantum yield for potential sensing and bio-imaging applications.

Keywords:
(photo)stabilitycore/shell/shell ZnSeS/Cu:ZnS/ZnS quantum dotsdopant locationoptoelectronic properties

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Quantum dots (QDs) are semiconductor nanocrystals with size-dependent optical and electronic properties.
  • Core/shell QD structures enhance photoluminescence (PL) and stability.
  • Copper (Cu) doping in QDs can introduce new emission pathways and improve PL efficiency.

Purpose of the Study:

  • To develop an aqueous-phase synthesis for 3-mercaptopropionic acid (3-MPA)-capped ZnSeS/Cu:ZnS/ZnS core/shell/shell quantum dots.
  • To investigate the effect of Cu-dopant location on the photoluminescence (PL) emission intensity and quantum yield.
  • To study the impact of varying Cu-loading on the optical properties and emission color.

Main Methods:

  • Aqueous-phase synthesis of ZnSeS/Cu:ZnS/ZnS core/shell/shell quantum dots using 3-mercaptopropionic acid (3-MPA) as a capping agent.
  • Systematic variation of Cu-dopant location within the ZnS shells.
  • Tuning of Cu-loading concentrations within the quantum dots.
  • Characterization of QD size, stability, photoluminescence properties, and photostability.

Main Results:

  • The highest PL quantum yield (25%) was achieved when Cu dopant was introduced in the first ZnS shell.
  • Increasing Cu doping from 1.25% to 7.5% caused a spectral shift from blue-green to green emission.
  • Synthesized ZnSeS/Cu:ZnS/ZnS QDs have an average diameter of 2.1 ± 0.3 nm.
  • The QDs demonstrated stability in aqueous solution for weeks and photostability under continuous illumination and oxygen presence.

Conclusions:

  • The location of Cu dopant significantly influences the PL emission intensity of ZnSeS/Cu:ZnS/ZnS QDs.
  • Optimal Cu doping in the first ZnS shell yields high PL quantum yield.
  • The synthesized QDs exhibit excellent stability and photostability, making them promising for applications.
  • These findings highlight the potential of Cu-doped core/shell QDs for advanced applications like sensing and bio-imaging.