Reprecipitation induced isolation of ligand-free Cs4PbBr6 nanodisks as a green emissive UV light filter

Uthirakumar, Periyayya; Devendiran, M.; Park, Jee Hye; Lee, In Hwan

doi:10.1016/j.porgcoat.2019.03.025

Cited by 11 publications

(8 citation statements)

References 42 publications

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“…These dense grains are also observed in the Cs 4 PbBr 6 nanodisks and attributed to Cs 4 PbBr 6 NCs. 22 The results from the energy-dispersive X-ray spectral analysis shown in Figure S2 exhibit that the atomic ratios of Cs/Pb/Br in the large and small grains are 4.6:1:6.4 and 3.3:1:6.5, respectively. The high-resolution transmission electron micrograph in Figure 4f shows that the indicated lattice spacing of 0.3 nm is probably the (002)-oriented CsPbBr 3 , whereas the spacings of 0.39 and 0.41 nm in most area should belong to the lattices of Cs 4 PbBr 6 .…”

Section: Resultsmentioning

confidence: 96%

Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Huang

et al. 2020

ACS Appl. Nano Mater.

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In this study, the facile synthesis and electroluminescent perovskite light-emitting diodes (PeLEDs) of highly luminescent Cs 4 PbBr 6 /CsPbBr 3 nanocomposite has been demonstrated. With the addition of proper antisolvents, the nanocomposite with a production yield of >90% and quantum yield of >85% was readily derived from the transformation of CsPbBr 3 powder. The obtained high quantum yield of the green nanocomposite originated from the fluorescent CsPbBr 3 nanocrystals embedded in the Cs 4 PbBr 6 matrix, which was verified by Xray diffraction, absorption, photoluminescence (PL), and PL excitation spectra. The addition of large cation precursors, such as CsBr and CH(NH 2 ) 2 Br, could contribute to the transformation efficiency and had no influence on the composition of the embedded nanocrystals. Via the thermal evaporation of the nanocomposite, all-inorganic electroluminescent PeLEDs with CuSCN and Cu-doped NiO x (NiO x :Cu) nanoparticles were fabricated and characterized. A maximum luminance of 1780 cd/m 2 and efficiency of 0.43 cd/A were achieved. Thus, the luminescent Cs 4 PbBr 6 /CsPbBr 3 nanocomposite is a promising material for nextgeneration displays and lighting.

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Section: Resultsmentioning

confidence: 96%

Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Huang

et al. 2020

ACS Appl. Nano Mater.

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“…The re-precipitation method is versatile, which has been used to synthesize lead halide perovskites and its derivatives in different forms, such as powders, single crystals, microcrystals and NCs. [38,40,45,58,[85][86][87][88][89][90][91][92][93] This approach could be readily carried out under ambient conditions. Typically, CsX and PbX 2 were firstly dissolved in good solvents such as dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), and then rapidly injected into an antisolvent (e.g., toluene, tetrahydrofuran (THF), Figure 6.…”

Section: Antisolvent Re-precipitationmentioning

confidence: 99%

“…However, to the best of our knowledge, we did not find any formula to follow. For Cs 4 PbBr 6 , the synthesis could be performed with a CsBr/PbBr 2 ratio ranging from 1:4, [42] 1:2, [89] 1:1, [38,44,49,57,86,94] 2:1, [85,88] 3:1 [87] to 4:1. [95] In the production of CsPb 2 X 5 , the CsX/PbX 2 ratio could be one of 1:10, [96] 1:5, [88] 1:3, [59] 1:2.5, [67] 1:2, [97] 1:1.…”

Section: Antisolvent Re-precipitationmentioning

confidence: 99%

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

et al. 2020

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resistance against thermal-treatment compared to organic-inorganic hybrid lead halide perovskites (MAPbX 3 and FAPbX 3), due to the high thermal decomposition temperature of inorganic cations, thus drawing much attention. Owing to their impressive features, all-inorganic lead halide perovskites have been greatly useful in photovoltaic and optoelectronic applications, including solar cells, light-emitting diodes (LEDs), lasers, photodetectors and photocatalysis. [5-17] The conspicuous achievements in CsPbX 3 provoke the rapid development of its derivatives, Cs 4 PbX 6 and CsPb 2 X 5. These Cs x Pb y X z materials are composed of the same element compositions and [PbX 6 ] 4− unit cells. However, they possess completely different connectivity characters of [PbX 6 ] 4− octahedrons. CsPbX 3 is classified as a type of 3D perovskite, because [PbX 6 ] 4− octahedra are corner-shared along all three axes, while CsPb 2 X 5 has a sandwich-like arrangement with Cs + cations in between PbX 2 crystallographic planes, which can be regarded as a 2D phase. In Cs 4 PbX 6 , disconnected [PbBr 6 ] 4− octahedra are completely decoupled by Cs + cations. Among these three structures, CsPb 2 X 5 and Cs 4 PbX 6 , with dimensional-network less than 3 are referred to as lowdimensional-networked cesium lead halide perovskites. Besides the connectivity, these structures can be understood from a confinement perspective. CsPbX 3 is not confined in any dimension such that it can be considered as a 3D networked semiconductor. CsPb 2 X 5 and Cs 4 PbX 6 are confined in one dimension and all three dimensions, hence the name 2D and 0D structures, respectively. [18,19] In CsPb 2 X 5 and Cs 4 PbX 6 , the excitons cannot dissociate easily within all dimensions; instead, they are confined in the PbX 2 planes and individual [PbX 6 ] 4− units, respectively, resulting in larger bandgaps compared to the traditional ABX 3 phase. Figure 1 illustrates these three structures with different dimensions. Until now, comprehensive accounts of these Cs x Pb y X z materials have been made. However, most recent research focuses on CsPbX 3 , which has excellent optical properties and promising potential in various applications. Its derivatives, CsPb 2 X 5 and Cs 4 PbX 6 have achieved tremendous progress but are still far behind that of CsPbX 3. Many problems still seriously limit the rapid development of these low-dimensional-networked perovskites, a typical one being the debate on the origin of their luminescence. In this Review article, we focus on Cs 4 PbX 6 and CsPb 2 X 5 , and attempt to unveil their features, potential in All-inorganic cesium lead halide perovskites have emerged as promising optoelectronic materials with excellent photophysical properties and great potential in a variety of applications. In parallel with the most investigated CsPbX 3 , its derivates, Cs 4 PbX 6 and CsPb 2 X 5 , with low-dimensional-networked structures have also attracted great attention. In this review, recent advancements on the low-dimensional-networked cesium lead halide perovs...

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“…Bands at 1582 and 1143 cm À1 were designated as N-H in-plane bends and C-N stretched amines, respectively. Furthermore, the peak position of Br 3d in XPS is shied by about 1.0 eV relative to the high binding energy (BE) in other literatures, 46,47,49 indicating the effect of -NH 3 + in L-lysine on the surface Br À defect sites. 50 While the FTIR spectrum of the product appears in the characteristic peak of the L-lysine functional group, it has different degrees of attenuation and enhancement, especially the weakening of the C-N bond.…”

Section: Resultsmentioning

confidence: 72%

“…4a) has similar binding energy to CsPbBr 3 quantum dots 46 and Cs 4 PbBr 6 nanosheets. 47 The low energy shoulder of the Pb 4f (Fig. 4b) main peak indicates that the surface Pb ions are not reacted in the product except for the portion participating in the reaction.…”

Section: Resultsmentioning

confidence: 99%

Rapid synthesis of cesium lead halide perovskite nanocrystals by l-lysine assisted solid-phase reaction at room temperature

Wen

et al. 2020

RSC Adv.

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Reprecipitation induced isolation of ligand-free Cs4PbBr6 nanodisks as a green emissive UV light filter

Cited by 11 publications

References 42 publications

Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Rapid synthesis of cesium lead halide perovskite nanocrystals by l-lysine assisted solid-phase reaction at room temperature

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Reprecipitation induced isolation of ligand-free Cs4PbBr6 nanodisks as a green emissive UV light filter

Cited by 11 publications

References 42 publications

Cs4PbBr6/CsPbBr3 Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Cs4PbBr6/CsPbBr3 Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Low‐Dimensional‐Networked Cesium Lead Halide Perovskites: Properties, Fabrication, and Applications

Rapid synthesis of cesium lead halide perovskite nanocrystals by l-lysine assisted solid-phase reaction at room temperature

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Product

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Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes

Cs₄PbBr₆/CsPbBr₃ Nanocomposites for All-Inorganic Electroluminescent Perovskite Light-Emitting Diodes