%0 Journal Article %1 fu2018unraveling %A Fu, Ming %A Tamarat, Philippe %A Trebbia, Jean-Baptiste %A Bodnarchuk, Maryna I. %A Kovalenko, Maksym V. %A Even, Jacky %A Lounis, Brahim %D 2018 %J Nature Communications %K FaPbl Fröhlich_polaron PL-measuring perovskite %N 1 %P 3318-- %R 10.1038/s41467-018-05876-0 %T Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons %U https://doi.org/10.1038/s41467-018-05876-0 %V 9 %X Formamidinium lead iodide (FAPbI3) exhibits the narrowest bandgap energy among lead halide perovskites, thus playing a pivotal role for the development of photovoltaics and near-infrared classical or quantum light sources. Here, we unveil the fundamental properties of FAPbI3 by spectroscopic investigations of nanocrystals of this material at the single-particle level. We show that these nanocrystals deliver near-infrared single photons suitable for quantum communication. Moreover, the low temperature photoluminescence spectra of FAPbI3 nanocrystals reveal the optical phonon modes responsible for the emission line broadening with temperature and a vanishing exciton–acoustic phonon interaction in these soft materials. The photoluminescence decays are governed by thermal mixing between fine structure states, with a two-optical phonon Raman scattering process. These results point to a strong Frölich interaction and to a phonon glass character that weakens the interactions of charge carriers with acoustic phonons and thus impacts their relaxation and mobility in these perovskites.

@article{fu2018unraveling, abstract = {Formamidinium lead iodide (FAPbI3) exhibits the narrowest bandgap energy among lead halide perovskites, thus playing a pivotal role for the development of photovoltaics and near-infrared classical or quantum light sources. Here, we unveil the fundamental properties of FAPbI3 by spectroscopic investigations of nanocrystals of this material at the single-particle level. We show that these nanocrystals deliver near-infrared single photons suitable for quantum communication. Moreover, the low temperature photoluminescence spectra of FAPbI3 nanocrystals reveal the optical phonon modes responsible for the emission line broadening with temperature and a vanishing exciton–acoustic phonon interaction in these soft materials. The photoluminescence decays are governed by thermal mixing between fine structure states, with a two-optical phonon Raman scattering process. These results point to a strong Frölich interaction and to a phonon glass character that weakens the interactions of charge carriers with acoustic phonons and thus impacts their relaxation and mobility in these perovskites.}, added-at = {2018-09-05T14:09:17.000+0200}, author = {Fu, Ming and Tamarat, Philippe and Trebbia, Jean-Baptiste and Bodnarchuk, Maryna I. and Kovalenko, Maksym V. and Even, Jacky and Lounis, Brahim}, biburl = {https://www.bibsonomy.org/bibtex/2233ac83e8a10bcbe52fd6e422b7279f6/bretschneider_m}, doi = {10.1038/s41467-018-05876-0}, interhash = {3dc135e93b1dd10c5a6c8d59750c0be1}, intrahash = {233ac83e8a10bcbe52fd6e422b7279f6}, issn = {20411723}, journal = {Nature Communications}, keywords = {FaPbl Fröhlich_polaron PL-measuring perovskite}, number = 1, pages = {3318--}, refid = {Fu2018}, timestamp = {2018-09-05T14:09:17.000+0200}, title = {Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons}, url = {https://doi.org/10.1038/s41467-018-05876-0}, volume = 9, year = 2018 }