FU, Ming; TAMARAT, Philippe; TREBBIA, Jean-Baptiste; BODNARCHUK, Maryna; KOVALENKO, Maksym; EVEN, Jacky; LOUNIS, Brahim

doi:10.1038/s41467-018-05876-0

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FU, Ming
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

TAMARAT, Philippe
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

TREBBIA, Jean-Baptiste
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

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Nature Communications. 2018-08-20, vol. 9, n° 1, p. 3318

Nature Publishing Group

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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.< Leer menos

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Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons

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