Highly emissive multiexcitons in steady-state photoluminescence of individual "giant" CdSe/CdS Core/Shell Nanocrystals

H. Htoon, A. V. Malko, D. Bussian, J. Vela, Y. Chen, J. A. Hollingsworth, Victor I Klimov

Research output: Contribution to journalArticle

121 Citations (Scopus)

Abstract

The development of nanocrystal quantum dots (NQDs) with suppressed nonradiative Auger recombination has been an important goal in colloidal nanostructure research motivated by the needs of prospective applications in lasing devices, light-emitting diodes, and photovoltaic cells. Here, we conduct single-nanocrystal spectroscopic studies of recently developed core-shell NQDs (so-called "giant" NQDs) that comprise a small CdSe core surrounded by a 16-monolayer-thick CdS shell. Using both continuous-wave and pulsed excitation, we observe strong emission features due both to neutral and charged biexcitons, as well as multiexcitons of higher order. The development of pronounced multiexcitonic peaks in steady-state photoluminescence of individual nanocrystals, as well as continuous growth of the emission intensity in the range of high pump levels, point toward a significant suppression of nonradiative Auger decay that normally renders multiexcitons nonemissive. The unusually high multiexciton emission efficiencies in these systems open interesting opportunities for studies of multiexciton phenomena using well-established methods of single-dot spectroscopy, as well as new exciting prospects for applications, that have previously been hampered by nonradiative Auger decay.

Original languageEnglish
Pages (from-to)2401-2407
Number of pages7
JournalNano Letters
Volume10
Issue number7
DOIs
Publication statusPublished - Jul 14 2010

Fingerprint

Nanocrystals
Photoluminescence
nanocrystals
photoluminescence
Semiconductor quantum dots
quantum dots
Photovoltaic cells
photovoltaic cells
Open systems
wave excitation
decay
continuous radiation
Light emitting diodes
lasing
Monolayers
Nanostructures
light emitting diodes
retarding
Pumps
Spectroscopy

Keywords

  • Auger recombination
  • Charged nanocrystal
  • Multiexciton
  • Nanocrystal
  • Quantum dot
  • Single-dot photoluminescence

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Highly emissive multiexcitons in steady-state photoluminescence of individual "giant" CdSe/CdS Core/Shell Nanocrystals. / Htoon, H.; Malko, A. V.; Bussian, D.; Vela, J.; Chen, Y.; Hollingsworth, J. A.; Klimov, Victor I.

In: Nano Letters, Vol. 10, No. 7, 14.07.2010, p. 2401-2407.

Research output: Contribution to journalArticle

Htoon, H. ; Malko, A. V. ; Bussian, D. ; Vela, J. ; Chen, Y. ; Hollingsworth, J. A. ; Klimov, Victor I. / Highly emissive multiexcitons in steady-state photoluminescence of individual "giant" CdSe/CdS Core/Shell Nanocrystals. In: Nano Letters. 2010 ; Vol. 10, No. 7. pp. 2401-2407.
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