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Related Experiment Video

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Stacking in colloidal nanoplatelets: tuning excitonic properties.

Burak Guzelturk1, Onur Erdem, Murat Olutas

  • 1Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University , Ankara 06800, Turkey.

ACS Nano
|December 4, 2014
PubMed
Summary
This summary is machine-generated.

Colloidal semiconductor nanoplatelets (NPLs) that stack together show significantly increased exciton transfer and trapping. This stacking leads to a tenfold decrease in photoluminescence quantum yield due to ultraefficient homo-Förster resonance energy transfer (FRET).

Keywords:
Förster resonance energy transfercolloidal nanoplateletscolloidal quantum wellsexciton trappingnonradiative energy transfertime-resolved fluorescence spectroscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Colloidal semiconductor nanoplatelets (NPLs) are promising for light applications.
  • NPLs can self-assemble into stacks, but their properties in this state are poorly understood.
  • Controlling NPL assembly is key to harnessing their optoelectronic potential.

Purpose of the Study:

  • To systematically investigate the excitonic properties of controlled column-like NPL assemblies.
  • To understand how NPL stacking influences exciton dynamics and photoluminescence.
  • To elucidate the role of Förster resonance energy transfer (FRET) in stacked NPL systems.

Main Methods:

  • Controlled synthesis and gradual assembly of NPLs into column-like structures.
  • Photoluminescence quantum yield measurements.
  • Transient fluorescence decay analysis.
  • Förster resonance energy transfer (FRET) efficiency calculations.
  • Rate-equation modeling of exciton dynamics.

Main Results:

  • NPL stacking substantially increases exciton transfer and trapping.
  • A tenfold decrease in photoluminescence quantum yield and accelerated fluorescence decay were observed upon stacking.
  • Ultraefficient homo-FRET (up to 99.9%) was demonstrated in stacked NPLs due to their collinear orientation, large extinction coefficient, and small Stokes shift.
  • Homo-FRET facilitates exciton trapping in nonemissive NPLs, leading to photoluminescence quenching via nonradiative recombination.

Conclusions:

  • Stacking control is critical for NPL solids, significantly altering their optoelectronic properties.
  • The observed homo-FRET signatures in NPL solids differ markedly from those in colloidal nanocrystals.
  • These findings provide fundamental insights into exciton behavior in ordered NPL assemblies, crucial for designing advanced optoelectronic devices.