Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 49, Pages 16094-16098Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201810110
Keywords
chemical cutting; perovskite nanorods; perovskite nanowires; shape transformation; single-photon emission
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Funding
- Bavarian State Ministry of Science, Research, and Arts through the grant Solar Technologies go Hybrid (SolTech)
- China Scholarship Council
- Horizon 2020 research and innovation program under the Marie Skodowska-Curie Grant Agreement COMPASS [691185]
- LMU Munich's Institutional Strategy LMU excellent
- French National Agency for Research
- French Excellence Initiative (Idex Bordeaux, LAPHIA Program)
- Institut Universitaire de France
- European Research Council [335078-COLOURATOMS]
- EU Infrastructure Project EUSMI (European Union's Horizon 2020) [731019]
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Post-synthetic shape-transformation processes provide access to colloidal nanocrystal morphologies that are unattainable by direct synthetic routes. Herein, we report our finding about the ligand-induced fragmentation of CsPbBr3 perovskite nanowires (NWs) into low aspect-ratio CsPbX3 (X = Cl, Br and I) nanorods (NRs) during halide ion exchange reaction with PbX2-ligand solution. The shape transformation of NWs-to-NRs resulted in an increase of photoluminescence efficiency owing to a decrease of nonradiative decay rates. Importantly, we found that the perovskite NRs exhibit single photon emission as revealed by photon antibunching measurements, while it is not detected in parent NWs. This work not only reports on the quantum light emission of low aspect ratio perovskite NRs, but also expands our current understanding of shape-dependent optical properties of perovskite nanocrystals.
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