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Compact Quantum Dots for Single-molecule Imaging

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Published on: October 9, 2012

Laser-Induced Size-Focusing Synthesis of High-Quality Colloidal Quantum Dots.

Yu-Zhuo Zhang¹, Chong Zhang¹, Bo Li²

¹New Cornerstone Science Laboratory, Department of Chemistry, Institute of Biomimetic Materials and Chemistry, Anhui Engineering Laboratory of Biomimetic Materials, Division of Nanomaterials and Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China.

Angewandte Chemie (International Ed. in English)

|December 22, 2025

Summary

Researchers developed a laser-assisted atom-by-atom photoetching method for colloidal quantum dots (QDs). This technique allows precise control over QD size and color by adjusting laser wavelength, enabling the synthesis of advanced quantum-confined materials.

Keywords:

Laser etching Photochemical reaction Quantum dots Size‐focusing effect

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Published on: June 16, 2023

Area of Science:

Materials Science
Nanotechnology
Photochemistry

Background:

Laser-assisted chemical synthesis offers novel routes to nanomaterials.
High-precision photoetching of colloidal quantum dots (QDs) remains a challenge.

Purpose of the Study:

To develop a laser-assisted atom-by-atom photoetching process for post-synthetic modification of colloidal CdSe QDs.
To elucidate the underlying surface chemistry and excitonic dynamics governing this process.

Main Methods:

Utilized laser-assisted atom-by-atom photoetching on colloidal CdSe QDs.
Investigated surface chemistry and ultrafast excitonic dynamics.
Employed in situ spectroscopies to analyze reaction kinetics and laser wavelength dependence.

Main Results:

Established an atomic-level activation-coordination coupling mechanism for exciton-involved photochemical reactions.
Identified a four-step size-focusing reaction process dependent on laser wavelength.
Demonstrated retrosynthetic programming of QD sizes and an ultrabroad color gamut by modulating laser wavelength.

Conclusions:

The laser-assisted photoetching process enables precise control over QD size and optical properties.
Modulating laser wavelength provides a guideline for retrosynthetically synthesizing high-quality quantum-confined materials.
This method facilitates the production of unconventional nanomaterials with tailored characteristics.