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Chemical Cutting of Perovskite Nanowires into Single‐Photon Emissive Low‐Aspect‐Ratio CsPbX 3 (X=Cl, Br, I) Nanorods
Author(s) -
Tong Yu,
Fu Ming,
Bladt Eva,
Huang He,
Richter Alexander F.,
Wang Kun,
MüllerBuschbaum Peter,
Bals Sara,
Tamarat Philippe,
Lounis Brahim,
Feldmann Jochen,
Polavarapu Lakshminarayana
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201810110
Subject(s) - nanorod , nanowire , perovskite (structure) , materials science , optoelectronics , photon , nanotechnology , optics , chemistry , crystallography , physics
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 CsPbBr 3 perovskite nanowires (NWs) into low aspect‐ratio CsPbX 3 (X=Cl, Br and I) nanorods (NRs) during halide ion exchange reaction with PbX 2 –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.