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Bright Infrared Colloidal PbS Nanoplatelets with Lead Sulfobromide Shells.

Sabin Aryal1,2, Yiteng Tang1,2, Dulanjan Harankahage1,2

  • 1Department of Physics and Astronomy, Bowling Green State University, Bowling Green, Ohio 43403, United States.

Chemistry of Materials : a Publication of the American Chemical Society
|February 16, 2026
PubMed
Summary
This summary is machine-generated.

Colloidal lead sulfide (PbS) nanoplatelets form stable core/shell structures with inorganic shells. These bright, air-stable materials offer efficient near-infrared emission for optoelectronics.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Colloidal quantum dots (CQDs) are promising for optoelectronic applications.
  • Surface defects in CQDs often limit their performance and stability.
  • Developing stable, high-performance CQDs is crucial for advancing infrared technologies.

Purpose of the Study:

  • To synthesize colloidal lead sulfide (PbS) nanoplatelets with enhanced stability and emissive properties.
  • To investigate the formation of core/shell heterostructures in PbS nanoplatelets.
  • To evaluate the optoelectronic performance of these novel core/shell structures.

Main Methods:

  • Synthesis of PbS nanoplatelets in bromide-containing media.
  • Characterization of core/shell heterostructure formation using advanced imaging techniques.
  • Photoluminescence spectroscopy to assess emission properties and quantum yield.
  • Band-structure measurements to determine electronic alignment.

Main Results:

  • Spontaneous formation of PbS/inorganic lead sulfobromide/lead bromide core/shell nanoplatelets.
  • Type-I band alignment observed, confining charge carriers within the PbS core.
  • Narrow photoluminescence peak (78 meV) at room temperature in the near-infrared region.
  • Inorganic shells provide effective passivation, suppressing surface defects and enhancing stability.

Conclusions:

  • The synthesized core/shell PbS nanoplatelets exhibit excellent stability and efficient near-infrared emission.
  • The robust inorganic shells improve photoluminescence quantum yield and performance under ambient conditions.
  • These solution-processable nanoplatelets are ideal for infrared photonics and optoelectronics, including emitters and detectors.