CsPbBr3 nanocrystals prepared by high energy ball milling in one-step and structural transformation from CsPbBr3 to CsPb2Br5

Wang, Lei; Ma, Decao; Guo, Chunxian; Jiang, Xin; Li, Mingliang; Xu, Tingting; Zhu, Jinpeng; Fan, Bingbing; Li, Wen; Shao, Gang; Xu, Hongliang; Wang, Hailong; Zhang, Rui; Lu, Hongxia

doi:10.1016/j.apsusc.2020.148782

Cited by 52 publications

(32 citation statements)

References 41 publications

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“…The increase in fluorescence lifetime indicates a higher efficiency of radiative Auger recombination of excitons, explaining the stronger PL intensity and higher PLQY of the water-treated sample compared with those of the as-evaporated one. 44,45 On the basis of the above-discussed results and analyses, we conclude that the structure of the as-evaporated CsPbBr 3 -and Cs 4 PbBr 6 -embedded Pb(OH)Br nanoplatelets was reorganized upon water soaking, which led to the shape evolution from nanoplatelets to microrods and concomitantly the phase transformation from mixed Cs 4 PbBr 6 and CsPbBr 3 to CsPb 2 Br 5 . Conversion between various perovskite phases has been investigated, 34,35,46 and water was noticed to play an important role in the transformation between different perovskite phases.…”

Section: ■ Introductionmentioning

confidence: 71%

“…47 By assistance of water and ultrasonic treatment, Cs 4 PbBr 6 could be converted to CsPbBr 3. 35 One of the typical mechanisms suggested that the phase transformation was controlled by 48 Consequently, we proposed that the chemical reaction occurring during the phase transformation upon exposure to water in our case can be expressed as follows 34,44 Cs…”

Section: ■ Introductionmentioning

confidence: 92%

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Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Dong

Kareem

Gong

et al. 2021

ACS Appl. Mater. Interfaces

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Lead halide perovskite (LHP) nanomaterials have attracted tremendous attention owing to their remarkable optoelectronic properties. However, they are extremely unstable under moist environments, high temperatures, and light illumination due to their intrinsic structural lability, which has been the critical unsolved problem for practical applications. To address this issue, we propose a facile and environmentally friendly ligand-free approach to design and synthesize rod-like CsPb 2 Br 5 -embedded Pb(OH)Br with excellent stability under various harsh environments such as soaking in water, heating, and ultraviolet (UV) illumination. Plate-like CsPbBr 3 -and Cs 4 PbBr 6 -embedded Pb(OH)Br powders are first formed by evaporating the solvent in a dispersion of ethanol (or methanol, isopropanol), Cs 2 CO 3 , and PbBr 2 . Upon soaking in water, the plate-like sample undergoes phase transformation from CsPbBr 3 and Cs 4 PbBr 6 to CsPb 2 Br 5 and shape conversion from nanoplate to a microrod, leading to the formation of rod-like CsPb 2 Br 5 -embedded Pb(OH)Br. The stable Pb(OH)Br coating effectively prevents the luminescent CsPb 2 Br 5 nanocrystals from reacting with water, leading to extremely high aqueous stability of the CsPb 2 Br 5 -embedded Pb(OH)Br. The photoluminescence (PL) intensity of the representative CsPb 2 Br 5 -embedded Pb(OH)Br sample can maintain 92.2% of the initial PL intensity value even after soaking in room-temperature water for 165 days; in the meantime, the phase and shape are preserved. The typical sample also shows outstanding stability under hot water, UV illumination, and annealing conditions. The ultrahigh aqueous stability, thermal stability, and photostability of the CsPb 2 Br 5 -embedded Pb(OH)Br nanomaterials suggest an effective, facile, and environmentally friendly technique to grow perovskite-based nanomaterials for promising practical applications in the optoelectronic field.

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Section: ■ Introductionmentioning

confidence: 71%

Section: ■ Introductionmentioning

confidence: 92%

Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Dong

Kareem

Gong

et al. 2021

ACS Appl. Mater. Interfaces

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“…The synthesis of Cs x (NH 4 ) 1Àx PbCl 2 Br NCs by the one-step high-energy ball-milling is illustrated in Fig.1. Unlike the ballmilling approaches commonly used,24,25 we ground the halide salts and the ligand oleylamine (OAm) in one step with different mole ratios (1 : 0.7 : 0.3, 1 : 0.5 : 0.5, 1 : 0.3 : 0.7 and 1 : 0 : 1) of PbCl 2 : CsBr : NH 4 Br. Such a simplified process facilitated the reduction of the production cost.…”

mentioning

confidence: 99%

Tunable deep-blue luminescence from ball-milled chlorine-rich Cs_x(NH₄)_1−xPbCl₂Br nanocrystals by ammonium modulation

Xiao

Xiong

et al. 2022

Chem. Commun.

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“…However, the grains of the Cs 4 PbBr 6 MCs synthesized with PAA were small and regular. This is because OAm, used as a ligand, can contribute to size control in the ball-milling process [ 45 ]. After the ethanol/water treatment, the grains of Cs 4 PbBr 6 MCs synthesized without PAA disappeared, and the Cs 4 PbBr 6 MCs synthesized with PAA had relatively small grains.…”

Section: Resultsmentioning

confidence: 99%

Improving the Stability of Ball-Milled Lead Halide Perovskites via Ethanol/Water-Induced Phase Transition

et al. 2022

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Recently, lead halide perovskite nanocrystals have been considered as potential light-emitting materials because of their narrow full width at half-maximum (FWHM) and high photoluminescence quantum yield (PLQY). In addition, they have various emission spectra because the bandgap can be easily tuned by changing the size of the nanocrystals and their chemical composition. However, these perovskite materials have poor long-term stability due to their sensitivity to moisture. Thus far, various approaches have been attempted to enhance the stability of the perovskite nanocrystals. However, the required level of stability in the mass production process of perovskite nanocrystals under ambient conditions has not been secured. In this work, we developed a facile two-step ball-milling and ethanol/water-induced phase transition method to synthesize stable CsPbBr3 perovskite materials. We obtained pure CsPbBr3 perovskite solutions with stability retention of 86% for 30 days under ambient conditions. Our materials show a high PLQY of 35% in solid films, and excellent thermal stability up to 80 °C. We believe that our new synthetic method could be applicable for the mass production of light-emitting perovskite materials.

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CsPbBr3 nanocrystals prepared by high energy ball milling in one-step and structural transformation from CsPbBr3 to CsPb2Br5

Cited by 52 publications

References 41 publications

Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Tunable deep-blue luminescence from ball-milled chlorine-rich Cs_x(NH₄)_1−xPbCl₂Br nanocrystals by ammonium modulation

Improving the Stability of Ball-Milled Lead Halide Perovskites via Ethanol/Water-Induced Phase Transition

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CsPbBr3 nanocrystals prepared by high energy ball milling in one-step and structural transformation from CsPbBr3 to CsPb2Br5

Cited by 52 publications

References 41 publications

Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Water-Triggered Transformation of Ligand-Free Lead Halide Perovskite Nanocrystal-Embedded Pb(OH)Br with Ultrahigh Stability

Tunable deep-blue luminescence from ball-milled chlorine-rich Csx(NH4)1−xPbCl2Br nanocrystals by ammonium modulation

Improving the Stability of Ball-Milled Lead Halide Perovskites via Ethanol/Water-Induced Phase Transition

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Product

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Tunable deep-blue luminescence from ball-milled chlorine-rich Cs_x(NH₄)_1−xPbCl₂Br nanocrystals by ammonium modulation