High‐Purity Hybrid Organolead Halide Perovskite Nanoparticles Obtained by Pulsed‐Laser Irradiation in Liquid

Abstract

Nanoparticles of hybrid organic-inorganic perovskites have attracted a great deal of attention due to their variety of optoelectronic properties, their low cost, and their easier integration into devices with complex geometry, compared with microcrystalline, thin-film, or bulk metal halides. Here we present a novel one-step synthesis of organolead bromide perovskite nanocrystals based on pulsed-laser irradiation in a liquid environment (PLIL). Starting from a bulk CH NH PbBr crystal, our PLIL procedure does not involve the use of high-boiling-point polar solvents or templating agents, and runs at room temperature. The resulting nanoparticles are characterized by high crystallinity and are completely free of any microscopic product or organic coating layer. We also demonstrate the straightforward inclusion of laser-generated perovskite nanocrystals in a polymeric matrix to form a nanocomposite with single- and two-photon luminescence properties.

Laser Ablation of Hybrid Perovskite Bulks into Nanoparticles: Adamantylammonium Halides as Ligands and Halide Sources

“…In spite of the fascinating progress made in the preparation of hybrid perovskite colloids, interest in exploring yet more new strategies have not been waned. 60 nm‐sized MAPbBr 3 perovskite NPs were prepared by pulsed‐laser irradiation (second harmonic of Nd:YAG at 532 nm) of ground crystals dispersed in chloroform by sonication . This strategy required the preparation of a micrometer‐sized single crystal of MAPbBr 3 by inverse temperature crystallization in DMF at 80 °C, using a highly concentrated solution of the precursors .…”

“…60 nm-sized MAPbBr 3 perovskite NPs were prepared by pulsed-laser irradiation (second harmonic of Nd:YAG at 532 nm) of ground crystals dispersed in chloroform by sonication. [12] This strategy required the preparation of a micrometer-sized single crystal of MAPbBr 3 by inverse temperature crystallization in DMF at 80°C, using a highly concentrated solution of the precursors. [13] The photofragmentation of powders dispersed in the chloroform, followed by coalescence and vapor condensation led to the final NPs (no Φ PL was reported).…”

Perovskite Nanoparticles: Synthesis, Properties, and Novel Applications in Photovoltaics and LEDs

“…A number of methods have been demonstrated to synthesize the colloidal perovskite NPs namely solvent‐induced reprecipitation, ligand‐assisted reprecipitation (LARP), emulsion process, template assisted synthesis, and others …”

“…The method is useful for bandgap engineering through confinement in nanoporous solids as well as precisely controlling the emission wavelength of perovskite nanoparticles in next‐generation, solution‐derived photonic source. Few other methods like electrospinning, pulsed‐laser irradiation in liquid have also been reported for perovskite NP synthesis, which mostly result in 2D perovskite structures …”

Increasing the Size-Selectivity in Laser-Based g/h Liquid Flow Synthesis of Pt and PtPd Nanoparticles for CO and NO Oxidation in Industrial Automotive Exhaust Gas Treatment Benchmarking

“…The in situ size quenching strategy is limited to well dispersed support materials at low concentration in order to avoid scattering of the incoming laser light or excitation of the support material potentially triggering cross-effects by changing its structure/composition. In case of the latter strategy of post-processing, the desired size fraction (<10 nm) is either extracted from the initial colloid, e.g., by continuous tubular centrifugation [41,46], or the larger fraction (>20 nm) is fragmented into smaller particles by laser fragmentation in liquid [47][48][49]. Tubular centrifugation has recently been shown to match the output flow rates of laser ablation (hundreds of mL/min), allowing it to be coupled to the ablation process downstream [46].…”