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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Trizio, Luca De
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Topics
Publications (11/11 displayed)
- 2024Exogenous Metal Cations in the Synthesis of CsPbBr3 Nanocrystals and Their Interplay with Tertiary Aminescitations
- 2023Light Emission from Low‐Dimensional Pb‐Free Perovskite‐Related Metal Halide Nanocrystalscitations
- 2023Lead‐Free Halide Perovskite Materials and Optoelectronic Devices: Progress and Prospectivecitations
- 2022One Hundred-Nanometer-Sized CsPbBr3/m-SiO2 Composites Prepared via Molten-Salts Synthesis are Optimal Green Phosphors for LCD Display Devicescitations
- 2022Exploiting the Transformative Features of Metal Halides for the Synthesis of CsPbBr3@SiO2 Core-Shell Nanocrystalscitations
- 2020Transforming colloidal Cs4PbBr6 nanocrystals with poly(maleic anhydride-alt-1-octadecene) into stable CsPbBr3 perovskite emitters through intermediate heterostructurescitations
- 2020Developing Lattice Matched ZnMgSe Shells on InZnP Quantum Dots for Phosphor Applicationscitations
- 2020Cs3Cu4In2Cl13 Nanocrystalscitations
- 2019Stable Ligand Coordination at the Surface of Colloidal CsPbBr3 Nanocrystalscitations
- 2018Colloidal Synthesis of Double Perovskite Cs2AgInCl6 and Mn-Doped Cs2AgInCl6 Nanocrystalscitations
- 2018Ab initio structure determination of Cu2- xTe plasmonic nanocrystals by precession-assisted electron diffraction tomography and HAADF-STEM imagingcitations
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article
Exogenous Metal Cations in the Synthesis of CsPbBr3 Nanocrystals and Their Interplay with Tertiary Amines
Abstract
<p>Current syntheses of CsPbBr<sub>3</sub> halide perovskite nanocrystals (NCs) rely on overstoichiometric amounts of Pb<sup>2+</sup> precursors, resulting in unreacted lead ions at the end of the process. In our synthesis scheme of CsPbBr<sub>3</sub> NCs, we replaced excess Pb<sup>2+</sup> with different exogenous metal cations (M) and investigated their effect on the synthesis products. These cations can be divided into two groups: group 1 delivers monodisperse CsPbBr<sub>3</sub> cubes capped with oleate species (as for the case when Pb<sup>2+</sup> is used in excess) and with a photoluminescence quantum yield (PLQY) as high as 90% with some cations (for example with M = In<sup>3+</sup>); group 2 yields irregularly shaped CsPbBr<sub>3</sub> NCs with broad size distributions. In both cases, the addition of a tertiary ammonium cation (didodecylmethylammonium, DDMA<sup>+</sup>) during the synthesis, after the nucleation of the NCs, reshapes the NCs to monodisperse truncated cubes. Such NCs feature a mixed oleate/DDMA<sup>+</sup> surface termination with PLQY values of up to 97%. For group 1 cations this happens only if the ammonium cation is directly added as a salt (DDMA-Br), while for group 2 cations this happens even if the corresponding tertiary amine (DDMA) is added, instead of DDMA-Br. This is attributed to the fact that only group 2 cations can facilitate the protonation of DDMA by the excess oleic acid present in the reaction environment. In all cases studied, the incorporation of M cations is marginal, and the reshaping of the NCs is only transient: if the reactions are run for a long time, the truncated cubes evolve to cubes.</p>