Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids

Clare E. Rowland, Igor Fedin, Hui Zhang, Stephen K. Gray, Alexander O. Govorov, Dmitri V. Talapin, Richard D Schaller

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Fluorescence resonance energy transfer (FRET) enables photosynthetic light harvesting, wavelength downconversion in light-emitting diodes (LEDs), and optical biosensing schemes. The rate and efficiency of this donor to acceptor transfer of excitation between chromophores dictates the utility of FRET and can unlock new device operation motifs including quantum-funnel solar cells, non-contact chromophore pumping from a proximal LED, and markedly reduced gain thresholds. However, the fastest reported FRET time constants involving spherical quantum dots (0.12-1 ns; refs,) do not outpace biexciton Auger recombination (0.01-0.1 ns; ref.), which impedes multiexciton-driven applications including electrically pumped lasers and carrier-multiplication-enhanced photovoltaics. Few-monolayer-thick semiconductor nanoplatelets (NPLs) with tens-of-nanometre lateral dimensions exhibit intense optical transitions and hundreds-of-picosecond Auger recombination, but heretofore lack FRET characterizations. We examine binary CdSe NPL solids and show that interplate FRET (â 1/46-23 ps, presumably for co-facial arrangements) can occur 15-50 times faster than Auger recombination and demonstrate multiexcitonic FRET, making such materials ideal candidates for advanced technologies.

Original languageEnglish
Pages (from-to)484-489
Number of pages6
JournalNature Materials
Volume14
Issue number5
DOIs
Publication statusPublished - May 1 2015

Fingerprint

resonance fluorescence
Energy transfer
energy transfer
Chromophores
chromophores
Light emitting diodes
light emitting diodes
funnels
Optical transitions
optical transition
multiplication
Semiconductor quantum dots
time constant
Fluorescence Resonance Energy Transfer
Monolayers
Solar cells
pumping
solar cells
quantum dots
Semiconductor materials

ASJC Scopus subject areas

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

Cite this

Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids. / Rowland, Clare E.; Fedin, Igor; Zhang, Hui; Gray, Stephen K.; Govorov, Alexander O.; Talapin, Dmitri V.; Schaller, Richard D.

In: Nature Materials, Vol. 14, No. 5, 01.05.2015, p. 484-489.

Research output: Contribution to journalArticle

Rowland, Clare E. ; Fedin, Igor ; Zhang, Hui ; Gray, Stephen K. ; Govorov, Alexander O. ; Talapin, Dmitri V. ; Schaller, Richard D. / Picosecond energy transfer and multiexciton transfer outpaces Auger recombination in binary CdSe nanoplatelet solids. In: Nature Materials. 2015 ; Vol. 14, No. 5. pp. 484-489.
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