A reduction pathway in the synthesis of PbSe nanocrystal quantum dots

Jin Joo, Jeffrey M. Pietryga, John A. McGuire, Sea Ho Jeon, Darrick J. Williams, Hsing Lin Wang, Victor I Klimov

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

Colloidal nanocrystal quantum dots (NQDs) of narrow band gap materials are of substantial general interest because of their unparalleled potential as infrared fluorophores. While PbSe NQDs are a promising class of infrared-active nanocrystals due to high emission quantum yields and a wide useful spectral range, typical synthetic methods are sensitive to a variety of factors, including the influence of solvent/ligand impurities that render reproducibility difficult. In this work, we specifically examine the effects of diphenylphosphine and 1,2-hexadecanediol, as surrogates for putative trioctylphosphine-based reducing impurities, on the synthesis of PbSe NQDs. Specifically, we compare their influence on NQD size, chemical yield, and photoluminescence quantum yield. While both additives substantially increase the chemical yield of the synthesis, they demonstrate markedly different effects on emission quantum yield of the product NQDs. We further examine the effects of reaction temperature and oleic acid concentration on the diolassisted synthesis. Increased oleic acid concentration led to somewhat higher growth rates and larger NQDs but at the expense of lower chemical yield. Temperature was found to have an even greater effect on growth rate and NQD size. Neither temperature nor oleic acid concentration was found to have noticeable effects on NQD emission quantum yield. Finally, we use numerical simulations to support the conjecture that the increased yield is likely a result of faster monomer formation, consistent with the activation of an additional reaction pathway by the reducing species.

Original languageEnglish
Pages (from-to)10620-10628
Number of pages9
JournalJournal of the American Chemical Society
Volume131
Issue number30
DOIs
Publication statusPublished - Aug 5 2009

Fingerprint

Quantum Dots
Nanoparticles
Nanocrystals
Semiconductor quantum dots
Quantum yield
Oleic acid
Oleic Acid
Temperature
Impurities
Infrared radiation
lead selenide
Fluorophores
Growth
Photoluminescence
Energy gap
Monomers
Chemical activation
Ligands

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Joo, J., Pietryga, J. M., McGuire, J. A., Jeon, S. H., Williams, D. J., Wang, H. L., & Klimov, V. I. (2009). A reduction pathway in the synthesis of PbSe nanocrystal quantum dots. Journal of the American Chemical Society, 131(30), 10620-10628. https://doi.org/10.1021/ja903445f

A reduction pathway in the synthesis of PbSe nanocrystal quantum dots. / Joo, Jin; Pietryga, Jeffrey M.; McGuire, John A.; Jeon, Sea Ho; Williams, Darrick J.; Wang, Hsing Lin; Klimov, Victor I.

In: Journal of the American Chemical Society, Vol. 131, No. 30, 05.08.2009, p. 10620-10628.

Research output: Contribution to journalArticle

Joo, J, Pietryga, JM, McGuire, JA, Jeon, SH, Williams, DJ, Wang, HL & Klimov, VI 2009, 'A reduction pathway in the synthesis of PbSe nanocrystal quantum dots', Journal of the American Chemical Society, vol. 131, no. 30, pp. 10620-10628. https://doi.org/10.1021/ja903445f
Joo J, Pietryga JM, McGuire JA, Jeon SH, Williams DJ, Wang HL et al. A reduction pathway in the synthesis of PbSe nanocrystal quantum dots. Journal of the American Chemical Society. 2009 Aug 5;131(30):10620-10628. https://doi.org/10.1021/ja903445f
Joo, Jin ; Pietryga, Jeffrey M. ; McGuire, John A. ; Jeon, Sea Ho ; Williams, Darrick J. ; Wang, Hsing Lin ; Klimov, Victor I. / A reduction pathway in the synthesis of PbSe nanocrystal quantum dots. In: Journal of the American Chemical Society. 2009 ; Vol. 131, No. 30. pp. 10620-10628.
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