Related Experiment Video
Updated: Feb 17, 2026
04:14
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
13.6K
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
Summary
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.
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.
