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Updated: May 9, 2026

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Colossal Core/Shell CdSe/CdS Quantum Dot Emitters.

Hao A Nguyen¹, Benjamin F Hammel², David Sharp³

¹Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.

|July 26, 2024

Summary

This summary is machine-generated.

Researchers developed colossal quantum dots (QDs) for quantum technologies. These large, stable QDs offer improved single-photon emission, crucial for scalable photonic devices.

Keywords:

electron microscopy light emission nanocrystals quantum dots semiconductor core/shell materials single-photon sources

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Synthesis of In37P20O2CR51 Clusters and Their Conversion to InP Quantum Dots

Synthesis of In37P20O2CR51 Clusters and Their Conversion to InP Quantum Dots

Published on: May 7, 2019

Area of Science:

Materials Science
Quantum Optics
Nanotechnology

Background:

Scalable integration of single-photon sources is vital for quantum technologies.
Deterministic positioning of traditional, small quantum dots (QDs) in photonic structures is challenging.
Existing giant core/shell QDs (20-50 nm) have limitations in large-scale device integration.

Purpose of the Study:

To develop a synthesis strategy for colossal core/shell quantum dots exceeding current size limitations.
To investigate the morphology and growth conditions of these large quantum dots.
To assess the suitability of colossal QDs as high-performance single-photon sources.

Main Methods:

Stepwise high-temperature continuous injection synthesis method.
Electron microscopy for morphological and structural analysis.
Photoluminescence lifetime and second-order photon correlation measurements.

Main Results:

Successfully synthesized colossal CdSe/CdS QDs ranging from 30 to 100 nm.
Identified synthesis conditions for crystalline particles and factors leading to defects.
Achieved long photoluminescence lifetimes (microseconds) and suppressed blinking at room temperature.
Demonstrated high single-photon emission purity (g(2)(0) < 0.2) for QDs with 80-100 CdS monolayers.

Conclusions:

Colossal QDs offer a promising pathway for scalable quantum photonic devices.
The developed synthesis method enables precise control over QD size and morphology.
These large QDs exhibit excellent properties for advanced single-photon applications.