Lifetime blinking in nonblinking nanocrystal quantum dots

Christophe Galland, Yagnaseni Ghosh, Andrea Steinbrück, Jennifer A. Hollingsworth, Han Htoon, Victor I Klimov

Research output: Contribution to journalArticle

146 Citations (Scopus)

Abstract

Nanocrystal quantum dots are attractive materials for applications as nanoscale light sources. One impediment to these applications is fluctuations of single-dot emission intensity, known as blinking. Recent progress in colloidal synthesis has produced nonblinking nanocrystals; however, the physics underlying blinking suppression remains unclear. Here we find that ultra-thick-shell CdSe/CdS nanocrystals can exhibit pronounced fluctuations in the emission lifetimes (lifetime blinking), despite stable nonblinking emission intensity. We demonstrate that lifetime variations are due to switching between the neutral and negatively charged state of the nanocrystal. Negative charging results in faster radiative decay but does not appreciably change the overall emission intensity because of suppressed nonradiative Auger recombination for negative trions. The Auger process involving excitation of a hole (positive trion pathway) remains efficient and is responsible for charging with excess electrons, which occurs via Auger-assisted ionization of biexcitons accompanied by ejection of holes.

Original languageEnglish
Article number908
JournalNature Communications
Volume3
DOIs
Publication statusPublished - 2012

Fingerprint

blinking
Blinking
Quantum Dots
Nanoparticles
Nanocrystals
Semiconductor quantum dots
nanocrystals
quantum dots
life (durability)
charging
Physics
ejection
Genetic Recombination
Ionization
Light sources
light sources
retarding
Electrons
Light
ionization

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Galland, C., Ghosh, Y., Steinbrück, A., Hollingsworth, J. A., Htoon, H., & Klimov, V. I. (2012). Lifetime blinking in nonblinking nanocrystal quantum dots. Nature Communications, 3, [908]. https://doi.org/10.1038/ncomms1916

Lifetime blinking in nonblinking nanocrystal quantum dots. / Galland, Christophe; Ghosh, Yagnaseni; Steinbrück, Andrea; Hollingsworth, Jennifer A.; Htoon, Han; Klimov, Victor I.

In: Nature Communications, Vol. 3, 908, 2012.

Research output: Contribution to journalArticle

Galland, C, Ghosh, Y, Steinbrück, A, Hollingsworth, JA, Htoon, H & Klimov, VI 2012, 'Lifetime blinking in nonblinking nanocrystal quantum dots', Nature Communications, vol. 3, 908. https://doi.org/10.1038/ncomms1916
Galland, Christophe ; Ghosh, Yagnaseni ; Steinbrück, Andrea ; Hollingsworth, Jennifer A. ; Htoon, Han ; Klimov, Victor I. / Lifetime blinking in nonblinking nanocrystal quantum dots. In: Nature Communications. 2012 ; Vol. 3.
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