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Single-mode lasing from colloidal water-soluble CdSe/CdS quantum dot-in-rods.

Francesco Di Stasio1, Joel Q Grim, Vladimir Lesnyak

  • 1Istituto Italiano di Tecnologia, Via Morego 30, IT-, 16163, Genoa, Italy.

Small (Weinheim an Der Bergstrasse, Germany)
|October 23, 2014
PubMed
Summary

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Researchers developed water-soluble cadmium selenide/cadmium sulfide (CdSe/CdS) quantum dot-in-rods using mercaptopropionic acid. This method preserves their light-emitting properties for applications in amplified spontaneous emission and microlasers.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Core-shell CdSe/CdS nanocrystals are promising for light-emitting applications.
  • Current synthesis yields materials soluble in organic solvents, limiting processing options.
  • Achieving water solubility without compromising luminescence is a significant challenge.

Purpose of the Study:

  • To develop a method for water-solubilizing CdSe/CdS quantum dot-in-rods.
  • To maintain the luminescent properties of the nanocrystals after transfer to an aqueous phase.
  • To demonstrate the potential of water-soluble dot-in-rods in optical applications.

Main Methods:

  • Ligand exchange using mercaptopropionic acid (MPA) to transfer CdSe/CdS quantum dot-in-rods into water.
  • Utilizing an enlarged CdS rod diameter to shield the core from surface defects during ligand exchange.
Keywords:
amplified spontaneous emissioncolloidal nanocrystalslasingquantum dot-in-rodswater soluble

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  • Fabrication of self-assembled microlasers using the coffee-ring effect.

    • Main Results:

    • Successful transfer of CdSe/CdS quantum dot-in-rods to water while preserving luminescence.
    • Films exhibited amplified spontaneous emission (ASE) with thresholds comparable to pristine materials (130 μJ/cm(2) vs. 115 μJ/cm(2)).
    • Fabricated microlasers demonstrated single-mode operation with a low threshold (∼10 μJ/cm(2)), enhanced by MPA ligand density.

    Conclusions:

    • Enlarged CdS diameter is crucial for maintaining photophysics during aqueous ligand exchange.
    • Water-soluble CdSe/CdS dot-in-rods are viable for amplified spontaneous emission and microlaser applications.
    • MPA ligands facilitate high packing density, improving microlaser performance.