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Chloride-Induced Thickness Control in CdSe Nanoplatelets.

Sotirios Christodoulou1,2, Juan I Climente3, Josep Planelles3

  • 1Istituto Italiano di Tecnologia , Via Morego 30 , 16163 Genova , Italy.

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|September 5, 2018
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Summary

Researchers developed a new method to synthesize thicker cadmium selenide nanoplatelets (NPLs), extending their emission range to 625 nm. This breakthrough enhances colloidal nanocrystal emitters for broader applications.

Keywords:
2D nanocrystalsColloidal synthesishalidesk·p calculationsphotoluminescence

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Dots

Background:

  • Colloidal synthesis of cadmium selenide nanoplatelets (NPLs) typically produces emission from 460 to 550 nm.
  • Expanding the emission range requires thicker NPLs, a challenge often addressed by atomic layer deposition or core/shell structures.
  • Existing methods for thicker NPLs are complex and may not yield optimal optical properties.

Purpose of the Study:

  • To develop a novel colloidal synthesis method for producing thicker CdSe NPLs.
  • To extend the emission range of CdSe NPLs beyond 550 nm.
  • To investigate the role of chloride ions in controlling NPL growth and properties.

Main Methods:

  • A two-step reaction scheme was employed, transitioning from 2D to 3D growth.
  • Starting with 4.5 monolayer (ML) NPLs, thickness was increased to 5.5–8.5 ML.
  • Cadmium chloride (CdCl2) was added to enhance the growth rate of basal facets.

Main Results:

  • Nearly monodisperse CdSe NPLs with thicknesses from 5.5 to 8.5 ML were synthesized.
  • Emission peaks were observed from 554 nm to 625 nm with narrow linewidths (9–13 nm fwhm).
  • NPLs exhibited short emission lifetimes (5–11 ns) and revealed high-energy peaks in photoluminescence excitation spectra, indicative of specific band structure transitions.

Conclusions:

  • Chloride ions offer a new pathway for controlling the growth of 2D colloidal nanoplatelets.
  • The novel synthesis method successfully extends the emission range of CdSe NPLs.
  • This work provides new insights into CdSe NPL synthesis and their optoelectronic properties, particularly concerning excited-state transitions.