Using Shape to Turn off Blinking for Two-Colour Multiexciton Emission in CdSe/CdS Tetrapods

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Using Shape to Turn off Blinking for Two-Colour Multiexciton Emission in CdSe/CdS Tetrapods

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Title: Using Shape to Turn off Blinking for Two-Colour Multiexciton Emission in CdSe/CdS Tetrapods
Author(s):
Mishra, Nimai;
Orfield, Noah J.;
Wang, Feng;
Hu, Zhongjian;
Krishnamurthy, Sachidananda;
Malko, Anton V.;
Casson, Joanna L.;
Htoon, Han;
Sykora, Milan;
Hollingsworth, Jennifer A.
Date Created: 2017-05-12
Item Type: article
Keywords: Show Keywords
Abstract: Semiconductor nanostructures capable of emitting from two excited states and thereby of producing two photoluminescence colours are of fundamental and potential technological significance. In this limited class of nanocrystals, CdSe/CdS core/arm tetrapods exhibit the unusual trait of two-colour (red and green) multiexcitonic emission, with green emission from the CdS arms emerging only at high excitation fluences. Here we show that by synthetic shape-tuning, both this multi-colour emission process, and blinking and photobleaching behaviours of single tetrapods can be controlled. Specifically, we find that the properties of dual emission and single-nanostructure photostability depend on different structural parameters-arm length and arm diameter, respectively-but that both properties can be realized in the same nanostructure. Furthermore, based on results of correlated photoluminescence and transient absorption measurements, we conclude that hole-trap filling in the arms and partial state-filling in the core are necessary preconditions for the observation of multiexciton multi-colour emission.
ISSN: 2041-1723
Source: Nature Communications
Link to Related Resource: http://dx.doi.org/10.1038/ncomms15083
Persistent Link: http://hdl.handle.net/10735.1/6040
Bibliographic Citation: Mishra, Nimai, Noah J. Orfield, Feng Wang, Zhongjian Hu, et al. 2017. "Using shape to turn off blinking for two-colour multiexciton emission in CdSe/CdS tetrapods." Nature Communications 8, doi:10.1038/ncomms15083
Terms of Use: CC BY 4.0 (Attribution)
©2017 The Authors
Sponsors: U.S. Department of Energy (DOE) grant 2009LANL1096. DOE OBES grant DE-SC0010697. CINT User Projects (U2013A0134 and U2013B0037).

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CC BY 4.0 (Attribution) Except where otherwise noted, this item's license is described as CC BY 4.0 (Attribution)