Fast Intrinsic Emission Quenching in Cs₄PbBr₆ Nanocrystals.

ABSTRACT: Cs₄PbBr₆ (0D) nanocrystals at room temperature have both been reported as nonemissive and green-emissive systems in conflicting reports, with no consensus regarding both the origin of the green emission and the emission quenching mechanism. Here, via ab initio molecular dynamics (AIMD) simulations and temperature-dependent photoluminescence (PL) spectroscopy, we show that the PL in these 0D metal halides is thermally quenched well below 300 K via strong electron-phonon coupling. To unravel the source of green emission reported for bulk 0D systems, we further study two previously suggested candidate green emitters: (i) a Br vacancy, which we demonstrate to present a strong thermal emission quenching at room temperature; (ii) an impurity, based on octahedral connectivit

SUBMITTER: Petralanda U 

PROVIDER: S-EPMC8554796 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature