Open AccessNegatively Charged and Dark Excitons in CsPbBr3 Perovskite Nanocrystals Revealed by High Magnetic Fields
Author(s) -
Damien Canneson,
Elena V. Shornikova,
D. R. Yakovlev,
Tobias Rogge,
Anatolie Mitioglu,
Mariana V. Ballottin,
Peter C. M. Christianen,
Emmanuel Lhuillier,
M. Bayer,
Louis Biadala
Publication year - 2017
Publication title -
nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.853
H-Index - 488
eISSN - 1530-6992
pISSN - 1530-6984
DOI - 10.1021/acs.nanolett.7b02827
Subject(s) - exciton , perovskite (structure) , spectroscopy , nanocrystal , halide , magnetic field , atomic physics , electron , polarization (electrochemistry) , materials science , physics , molecular physics , condensed matter physics , chemistry , nanotechnology , crystallography , inorganic chemistry , nuclear physics , quantum mechanics
The optical properties of colloidal cesium lead halide perovskite (CsPbBr 3 ) nanocrystals are examined by time-resolved and polarization-resolved spectroscopy in high magnetic fields up to 30 T. We unambiguously show that at cryogenic temperatures the emission is dominated by recombination of negatively charged excitons with radiative decay time of 300 ps. The additional long-lived emission, which decay time shortens from 40 down to 8 ns and in which the decay time shortens and relative amplitude increases in high magnetic fields, evidences the presence of a dark exciton. We evaluate g-factors of the bright exciton g X = +2.4, the electron g e = +2.18, and the hole g h = -0.22.
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