Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.219
Publication date: 18th July 2019
Colloidal semiconductor nanoplatelets have a band-edge emission that by now can be tuned from the UV to the near infrared.[1-3] To further steer their optical properties, we can introduce heterovalent dopants. This leads to a broadened emission combined with an enlarged Stokes shift, so that reabsorption of the emitted light can be minimized. In this presentation, I will discuss how we synthesized CdS:Ag, CdSe:Ag, and CdSe:Ag/CdS nanoplatelets with emission peaks ranging from 570 nm to 880 nm, and fluorescence quantum efficiencies exceeding 50%.[4] Optical characterization of the samples with time-resolved fluorescence and transient absorption spectroscopy, as well as spectro-electrochemical measurements, yielded a detailed picture of dopant distribution and carrier dynamics in CdSe:Ag nanoplatelets. In particular, at low Ag concentration the dopant mainly passivates surface traps, and only at higher concentration all CdSe nanoplatelets in the ensemble show deep defect emission. By independent tuning of the electron and hole energy levels via quantum confinement and doping, respectively, we obtained a strongly red shifted fluorescence with large Stokes shift that, combined with an enhanced absorption cross section in doped 2D nanoplatelets, should benefit applications such as near-infrared light-emitting diodes or luminescent solar concentrators.
Z.H., D.V.T., and I.T. acknowledge the Research Foundation Flanders (project 17006602). P.G. acknowledges the FWO-Vlaanderen for a Postdoctoral Fellowship. I.M. and Z.H. acknowledge Ghent University for funding (GOA 01G01019). This project has also received funding from the European Union’s Horizon 2020 research and innovation program (grant agreement no. 696656 GrapheneCore1) and the European Research Council (ERC, grant agreement no. 714876 PHOCONA). V.P. and S.B. are grateful to the MIUR “Dipartimenti di Eccellenza 2017 Project - Materials for Energy”.
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