Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons - 2015--> : Nano-optique et systèmes quantiques Access content directly
Journal Articles Nature Communications Year : 2018

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

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.
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hal-01858261 , version 1 (12-07-2019)

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Ming Fu, Philippe Tamarat, Jean-Baptiste Trebbia, Maryna I Bodnarchuk, Maksym V Kovalenko, et al.. Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons. Nature Communications, 2018, 9 (1), pp.3318. ⟨10.1038/s41467-018-05876-0⟩. ⟨hal-01858261⟩
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