Skip to Main content Skip to Navigation
Journal articles

Exciton-phonon coupling in a CsPbBr 3 single nanocrystal

Abstract : We have performed micro-photoluminescence measurements on a single CsPbBr3 nanocrystal (NC) with a size comparable to the Bohr diameter (7 nm). When the NC has an orthorhombic crystal symmetry, we observe an exciton fine structure composed of three peaks linearly polarized. We took advantage of the polarization properties of micro-photoluminescence to monitor in situ both the energy and linewidth of individual peaks when increasing temperature. We reveal that two regimes exist, at low and high temperature, which are dominated by acoustic or longitudinal optical phonon (Fröhlich term) couplings, respectively. The acoustic contribution does not change when the energy of the excitonic transition varies in the range of 2.46–2.62 eV, i.e., with NC sizes corresponding to this range. We find that line broadening is mainly ruled by the Fröhlich term, which is consistent with the polar nature of CsPbBr3.
Document type :
Journal articles
Complete list of metadata

Cited literature [21 references]  Display  Hide  Download
Contributor : emmanuel lhuillier Connect in order to contact the contributor
Submitted on : Friday, March 30, 2018 - 3:45:20 PM
Last modification on : Thursday, March 17, 2022 - 10:08:55 AM


Pour la HAL APL 2018 L Legrand...
Files produced by the author(s)



Julien Ramade, Léon Marcel Andriambariarijaona, Violette Steinmetz, Nicolas Goubet, Laurent Legrand, et al.. Exciton-phonon coupling in a CsPbBr 3 single nanocrystal. Applied Physics Letters, American Institute of Physics, 2018, 112 (7), pp.072104. ⟨10.1063/1.5018413⟩. ⟨hal-01736974⟩



Record views


Files downloads