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

Nature Materials
Clare E RowlandRichard D Schaller

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 7-9) do not outpace biexciton Auger recombination (0.01-0.1 ns; ref. 10), 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 (∼6-23 ps, presumably for co-facial arrangements) can occur 15-50 times faster than Auger recombination and demonstrate multiexcitonic FRET, making such materials ideal candida...Continue Reading

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Citations

Jan 21, 2016·The Journal of Physical Chemistry Letters·Onur ErdemHilmi Volkan Demir
Dec 22, 2015·Journal of the American Chemical Society·Sung Jun LimAndrew M Smith
Dec 17, 2015·Journal of the American Chemical Society·Yehonadav BekensteinA Paul Alivisatos
Dec 17, 2015·The Journal of Chemical Physics·Kenley M PelzerRichard D Schaller
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Sep 8, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Santanu JanaBenjamin Abécassis
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Aug 24, 2016·Chemical Reviews·Michael A BolesDmitri V Talapin
Jun 23, 2016·Angewandte Chemie·Santanu JanaBenjamin Abécassis
Oct 11, 2016·Chemical Communications : Chem Comm·Guillaume H V BertrandIwan Moreels
Dec 29, 2017·Science Advances·Jakub JagielskiChih-Jen Shih
Oct 3, 2018·Chemical Communications : Chem Comm·Andreas RiedingerDavid J Norris
Mar 17, 2015·Nature Materials·Iwan Moreels
Sep 20, 2017·Science Advances·Santanu JanaBenjamin Abécassis
Apr 23, 2020·Nanoscale·Benjamin T DirollRichard D Schaller
Jan 29, 2020·Nature Nanotechnology·Elena V ShornikovaManfred Bayer
Jan 22, 2020·Nature Communications·Jakub JagielskiChih-Jen Shih
Jul 1, 2020·Nanomaterials·Dongxiang LuoBaiquan Liu
Feb 5, 2019·Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices·Jan F MietheNadja C Bigall
Mar 7, 2020·Light, Science & Applications·Junhong YuCuong Dang
Aug 12, 2018·Materials·Peng XiaoDong Liang

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