"Giant" multishell CdSe nanocrystal quantum dots with suppressed blinking

Yongfen Chen, Javier Vela, Han Htoon, Joanna L. Casson, Donald J. Werder, David A. Bussian, Victor I Klimov, Jennifer A. Hollingsworth

Research output: Contribution to journalArticle

628 Citations (Scopus)

Abstract

Semiconductor nanocrystal quantum dots (NQDs) comprise an important class of inorganic fluorophores for applications from optoelectronics to biology. Unfortunately, to date, NQD optical properties (e.g., their efficient and particle-size-tunable photoluminescence) have been susceptible to instabilities at the bulk and single-particle levels. Specifically, ensemble quantum yields (QYs) in emission are dependent upon NQD surface chemistry and chemical environment, while at the single-particle level, NQDs are characterized by significant fluorescence intermittency (blinking) that hinders applications as single-photon light sources for quantum informatics and biolabels for real-time monitoring of single biomolecules. Furthermore, while NQDs are significantly more photostable than their organic dye counterparts, traditional NQDs photobleach over periods of seconds to many minutes. Here, we demonstrate for the first time that by encapsulating the NQD core in a sufficiently thick inorganic shell, we are able to divorce NQD function from NQD surface chemistry and chemical environment. We show that our "giant" NQDs (g-NQDs) are functionally distinct from standard core-only, core/shell and even core/multishell NQDs. g-NQDs are substantially less sensitive to changes in surface chemistry. They do not photobleach under continuous laser excitation over periods of several hours repeated over several days, and they exhibit markedly different blinking behavior; >20% of the g-NQDs do not blink, while >40% have on-time fractions of >80%. All of these observations are in stark contrast with control samples comprising core-only and standard, thinner core/multishell NQDs.

Original languageEnglish
Pages (from-to)5026-5027
Number of pages2
JournalJournal of the American Chemical Society
Volume130
Issue number15
DOIs
Publication statusPublished - Apr 16 2008

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Blinking
Quantum Dots
Nanoparticles
Nanocrystals
Semiconductor quantum dots
Surface chemistry
Core samples
Laser excitation
Fluorophores
Informatics
Divorce
Biomolecules
Quantum yield
Optoelectronic devices
Photons
Particle Size
Light sources
Photoluminescence
Coloring Agents
Dyes

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Chen, Y., Vela, J., Htoon, H., Casson, J. L., Werder, D. J., Bussian, D. A., ... Hollingsworth, J. A. (2008). "Giant" multishell CdSe nanocrystal quantum dots with suppressed blinking. Journal of the American Chemical Society, 130(15), 5026-5027. https://doi.org/10.1021/ja711379k

"Giant" multishell CdSe nanocrystal quantum dots with suppressed blinking. / Chen, Yongfen; Vela, Javier; Htoon, Han; Casson, Joanna L.; Werder, Donald J.; Bussian, David A.; Klimov, Victor I; Hollingsworth, Jennifer A.

In: Journal of the American Chemical Society, Vol. 130, No. 15, 16.04.2008, p. 5026-5027.

Research output: Contribution to journalArticle

Chen, Y, Vela, J, Htoon, H, Casson, JL, Werder, DJ, Bussian, DA, Klimov, VI & Hollingsworth, JA 2008, '"Giant" multishell CdSe nanocrystal quantum dots with suppressed blinking', Journal of the American Chemical Society, vol. 130, no. 15, pp. 5026-5027. https://doi.org/10.1021/ja711379k
Chen Y, Vela J, Htoon H, Casson JL, Werder DJ, Bussian DA et al. "Giant" multishell CdSe nanocrystal quantum dots with suppressed blinking. Journal of the American Chemical Society. 2008 Apr 16;130(15):5026-5027. https://doi.org/10.1021/ja711379k
Chen, Yongfen ; Vela, Javier ; Htoon, Han ; Casson, Joanna L. ; Werder, Donald J. ; Bussian, David A. ; Klimov, Victor I ; Hollingsworth, Jennifer A. / "Giant" multishell CdSe nanocrystal quantum dots with suppressed blinking. In: Journal of the American Chemical Society. 2008 ; Vol. 130, No. 15. pp. 5026-5027.
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