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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Monodisperse Formamidinium Lead Bromide Nanocrystals with Bright and Stable Green Photoluminescence
Loredana Protesescu1,2, Sergii Yakunin1,2, Maryna I Bodnarchuk1,2
1Institute of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich , Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland.
Abstract:
Bright green emitters with adjustable photoluminescence (PL) maxima in the range of 530-535 nm and full-width at half-maxima (fwhm) of <25 nm are particularly desirable for applications in television displays and related technologies. Toward this goal, we have developed a facile synthesis of highly monodisperse, cubic-shaped formamidinium lead bromide nanocrystals (FAPbBr3 NCs) with perovskite crystal structure, tunable PL in the range of 470-540 nm by adjusting the nanocrystal size (5-12 nm), high quantum yield (QY) of up to 85% and PL fwhm of <22 nm. High QYs are also retained in films of FAPbBr3 NCs. In addition, these films exhibit low thresholds of 14 ± 2 microJ cm-2 for amplified spontaneous emission.
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