Pressure Processing of Nanocube Assemblies Toward Harvesting of a Metastable PbS Phase

Wang, Tie; Li, Ruipeng; Quan, Zewei; Loc, Welley Siu; Bassett, William A.; Xu, Hongwu; Cao, Y. Charles; Fang, Jiye; Wang, Zhongwu

doi:10.1002/adma.201502070

Cited by 63 publications

(62 citation statements)

References 35 publications

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“…2c). The PL weakening should be ascribed to the deviatoric stress arising from the nonhydrostatic conditions in the diamond anvil cell (DAC), which was indeed reported in earlier studies using synchrotron radiation small-angle X-ray scattering 31–33 . Deviatoric stresses eventually lead to slow amorphization of Cs 4 PbBr 6 NCs upon further compression, which is largely related to the higher degree of distortion and random orientations of inorganic octahedra within the material 25,34 .…”

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confidence: 55%

Pressure-induced emission of cesium lead halide perovskite nanocrystals

et al. 2018

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Metal halide perovskites (MHPs) are of great interest for optoelectronics because of their high quantum efficiency in solar cells and light-emitting devices. However, exploring an effective strategy to further improve their optical activities remains a considerable challenge. Here, we report that nanocrystals (NCs) of the initially nonfluorescent zero-dimensional (0D) cesium lead halide perovskite Cs4PbBr6 exhibit a distinct emission under a high pressure of 3.01 GPa. Subsequently, the emission intensity of Cs4PbBr6 NCs experiences a significant increase upon further compression. Joint experimental and theoretical analyses indicate that such pressure-induced emission (PIE) may be ascribed to the enhanced optical activity and the increased binding energy of self-trapped excitons upon compression. This phenomenon is a result of the large distortion of [PbBr6]4− octahedral motifs resulting from a structural phase transition. Our findings demonstrate that high pressure can be a robust tool to boost the photoluminescence efficiency and provide insights into the relationship between the structure and optical properties of 0D MHPs under extreme conditions.

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Section: Resultssupporting

confidence: 55%

Pressure-induced emission of cesium lead halide perovskite nanocrystals

et al. 2018

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“…[2b,14] Coincidentally, the reversal pressure of ≈5 GPa was close to the orthorhombic‐to‐quasi‐amorphous transition pressure of 5.1 GPa. Thus, it is suggested that the atomic movement associated with phase transformation facilitated the detachment of ligands from the surfaces of NCs . When the pressure was reduced to ambient pressure, the d ‐spacing of the SAXS peak did not return to 12.6 nm; instead, it continuously increased to 14.3 nm (Figure B).…”

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confidence: 99%

Nanocube Superlattices of Cesium Lead Bromide Perovskites and Pressure‐Induced Phase Transformations at Atomic and Mesoscale Levels

et al. 2017

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Lead halide perovskites are promising materials for a range of applications owing to their unique crystal structure and optoelectronic properties. Understanding the relationship between the atomic/mesostructures and the associated properties of perovskite materials is crucial to their application performances. Herein, the detailed pressure processing of CsPbBr perovskite nanocube superlattices (NC-SLs) is reported for the first time. By using in situ synchrotron-based small/wide angle X-ray scattering and photoluminescence (PL) probes, the NC-SL structural transformations are correlated at both atomic and mesoscale levels with the band-gap evolution through a pressure cycle of 0 ↔ 17.5 GPa. After the pressurization, the individual CsPbBr NCs fuse into 2D nanoplatelets (NPLs) with a uniform thickness. The pressure-synthesized perovskite NPLs exhibit a single cubic crystal structure, a 1.6-fold enhanced photoluminescence quantum yield, and a longer emission lifetime than the starting NCs. This study demonstrates that pressure processing can serve as a novel approach for the rapid conversion of lead halide perovskites into structures with enhanced properties.

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“…Nanocrystals (NCs) respond specifically to pressure with respect to phase progression, coherent crystal domain size, particle agglomeration, and morphology, accompanied by physical and chemical property modification. For example, high pressure can induce distinct textural coalescence of metallic Au/Ag NCs along with tuning the corresponding plasmonic resonance; (meta)stable phases in conventional semiconductors including CdSe and PbS/Pt;[15a,16] and alternation in the carrier dynamics in CdTe NCs and CsPbBr 3 perovskite nanocube superlattices …”

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High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates

et al. 2017

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High pressure (HP) can drive the direct sintering of nanoparticle assemblies for Ag/Au, CdSe/PbS nanocrystals (NCs). Instead of direct sintering for the conventional nanocrystals, this study experimentally observes for the first time high-pressure-induced comminution and recrystallization of organic-inorganic hybrid perovskite nanocrystals into highly luminescent nanoplates with a shorter carrier lifetime. Such novel pressure response is attributed to the unique structural nature of hybrid perovskites under high pressure: during the drastic cubic-orthorhombic structural transformation at ≈2 GPa, (301) the crystal plane fully occupied by organic molecules possesses a higher surface energy, triggering the comminution of nanocrystals into nanoslices along such crystal plane. Beyond bulk perovskites, in which pressure-induced modifications on crystal structures and functional properties will disappear after pressure release, the pressure-formed variants, i.e., large (≈100 nm) and thin (<10 nm) perovskite nanoplates, are retained and these exhibit simultaneous photoluminescence emission enhancing (a 15-fold enhancement in the photoluminescence) and carrier lifetime shortening (from ≈18.3 ± 0.8 to ≈7.6 ± 0.5 ns) after releasing of pressure from 11 GPa. This pressure-induced comminution of hybrid perovskite NCs and a subsequent amorphization-recrystallization treatment offer the possibilities of engineering the advanced hybrid perovskites with specific properties.

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Pressure Processing of Nanocube Assemblies Toward Harvesting of a Metastable PbS Phase

Cited by 63 publications

References 35 publications

Pressure-induced emission of cesium lead halide perovskite nanocrystals

Pressure-induced emission of cesium lead halide perovskite nanocrystals

Nanocube Superlattices of Cesium Lead Bromide Perovskites and Pressure‐Induced Phase Transformations at Atomic and Mesoscale Levels

High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates

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Pressure Processing of Nanocube Assemblies Toward Harvesting of a Metastable PbS Phase

Cited by 63 publications

References 35 publications

Pressure-induced emission of cesium lead halide perovskite nanocrystals

Pressure-induced emission of cesium lead halide perovskite nanocrystals

Nanocube Superlattices of Cesium Lead Bromide Perovskites and Pressure‐Induced Phase Transformations at Atomic and Mesoscale Levels

High‐Pressure‐Induced Comminution and Recrystallization of CH3NH3PbBr3 Nanocrystals as Large Thin Nanoplates

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High‐Pressure‐Induced Comminution and Recrystallization of CH₃NH₃PbBr₃ Nanocrystals as Large Thin Nanoplates