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Updated: May 21, 2026

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Published on: January 11, 2018

Lifetime blinking in nonblinking nanocrystal quantum dots.

Christophe Galland¹, Yagnaseni Ghosh, Andrea Steinbrück

¹Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Nature Communications

|June 21, 2012

Summary

This summary is machine-generated.

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Ultra-thick-shell nanocrystal quantum dots show emission lifetime fluctuations due to charge state changes. This reveals new insights into blinking suppression mechanisms in nanoscale light sources.

Area of Science:

Materials Science
Nanotechnology
Quantum Optics

Background:

Nanocrystal quantum dots (NQDs) are promising for nanoscale light sources.
NQD emission intensity fluctuations (blinking) hinder applications.
Recent colloidal synthesis yields nonblinking NQDs, but suppression physics is unclear.

Purpose of the Study:

Investigate blinking suppression mechanisms in ultra-thick-shell CdSe/CdS NQDs.
Clarify the role of charge state dynamics in NQD emission properties.
Understand the underlying physics of lifetime blinking.

Main Methods:

Fabrication of ultra-thick-shell CdSe/CdS nanocrystal quantum dots.
Time-resolved photoluminescence spectroscopy.
Analysis of emission intensity and lifetime fluctuations.

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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Last Updated: May 21, 2026

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

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Published on: January 11, 2018

Compact Quantum Dots for Single-molecule Imaging

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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Main Results:

Ultra-thick-shell CdSe/CdS NQDs exhibit significant emission lifetime fluctuations (lifetime blinking) despite stable intensity.
Lifetime variations correlate with switching between neutral and negatively charged states.
Negative charging accelerates radiative decay via suppressed nonradiative Auger recombination in negative trions.
Hole-excitation Auger processes drive charging through biexciton ionization.

Conclusions:

Charge state dynamics, specifically negative charging, are critical to understanding NQD emission behavior.
Lifetime blinking provides a new perspective on blinking suppression in NQDs.
Suppressed Auger recombination in negative trions is key to stable emission intensity.