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Updated: Sep 12, 2025

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Shell Phase and Morphology Control for Emission Tuning in III-V Core/Shell Quantum Dots.

Xiang Li¹, Einav Scharf¹, Adar Levi¹

¹The Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

|August 5, 2025

Summary

This summary is machine-generated.

Controlling shell growth in semiconductor quantum dots (QDs) enhances their light emission properties. Spherical shells improve quantum efficiency and stability, crucial for advanced light technologies.

Keywords:

III−V semiconductors Ostwald ripening crystal phase transformation epitaxial growth shell morphology control

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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Area of Science:

Materials Science
Nanotechnology
Semiconductor Physics

Background:

Epitaxial shells on III-V semiconductor quantum dots (QDs) enhance fluorescence quantum efficiency and stability.
Implementation in light emission technologies requires precise control over QD properties.

Purpose of the Study:

To control shell morphology and crystal structure in heterovalent III-V/II-VI core/shell QDs.
To investigate the effects of these controlled changes on QD emission properties.

Main Methods:

Tuning ZnSe shell growth modes (kinetic to thermodynamic) by adjusting precursor reactivity.
Employing high-temperature Ostwald ripening for controlled morphology.
Utilizing quantum mechanical simulations to analyze band alignment and exciton confinement.

Main Results:

Achieved controlled tuning of shell morphology (tetrahedral to spherical-like) and crystal structure (zinc-blende to wurtzite).
Spherical QD architectures exhibited higher photoluminescence quantum yield (PLQY) and improved stability.
Observed variations in core position within QDs under different growth modes.

Conclusions:

Morphological and crystal-type differences significantly impact band alignment and exciton confinement.
Tunable emission spectra and exciton dynamics were confirmed.
This research advances understanding of heteroepitaxial growth for optimized QD design in light emission applications.