Ultrastable and Reversible Fluorescent Perovskite Films Used for Flexible Instantaneous Display

Tan, Yeshu; Li, Ruiying; Xu, Hao; Qin, Yuanshuai; Song, Tao; Sun, Baoquan

doi:10.1002/adfm.201900730

Cited by 63 publications

(64 citation statements)

References 40 publications

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“…It can be seen that the PL intensity increases first and reaches its maximum when the ratio between CsPb 2 Br 5 and CsPbBr 3 phase is around 4.6 (Figure 2), and then the decrease of PL intensity when this ratio excess 4.6. The significant improvement in PL intensity of samples c-e is associated with the suitable volume fraction ratio of both structures [37]. Figure S4 shows the NCs synthesized with oleic acid and oleylamine quench after adding ethanol, which demonstrates that the NCs synthesized with CTAB have solvent-resistant ability as described in previous reports.…”

Section: Resultssupporting

confidence: 60%

Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature

Yun

Luo

et al. 2019

Nanomaterials

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Cesium lead halide perovskite nanocrystals (NCs) have attracted enormous interest in light-emitting diode, photodetector and low-threshold lasing application in terms of their unique optical and electrical performance. However, little attention has been paid to other structures associated with CsPbBr3, such as CsPb2Br5. Herein, we realize a facile method to prepare dual-phase NCs with improved stability against polar solvents by replacing conventional oleylamine with cetyltrimethyl ammonium bromide (CTAB) in the reprecipitation process. The growth of NCs can be regulated with different ratios of toluene and ethanol depending on solvent polarity, which not only obtains NCs with different sizes and morphologies, but also controls phase transition between orthorhombic CsPbBr3 and tetragonal CsPb2Br5. The photoluminescence (PL) and defect density calculated exhibit considerable solvent polarity dependence, which is ascribed to solvent polarity affecting the ability of CTAB to passivate surface defects and improve stoichiometry in the system. This new synthetic method of perovskite material will be helpful for further studies in the field of lighting and detectors.

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Section: Resultssupporting

confidence: 60%

Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature

Yun

Luo

et al. 2019

Nanomaterials

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“…Considering the ultrahigh solubility of CsX in polar solvents such as water, the water-triggered transformation CsPbX 3 →CsPb 2 X 5 by CsX stripping was widely investigated, and has been the most commonly used strategy in this conversion. [72,149,[161][162][163][164] In Bakr's work, [72] water could be employed to directly transform CsPbBr 3 films to highly luminescent and stable CsPb 2 Br 5 films. At the initial step, water accelerated the extraction of CsBr from CsPbBr 3 , because of the high solubility of CsBr in water and the ionic nature of CsPbBr 3 .…”

Section: Csx Extractionmentioning

confidence: 99%

“…The dual-phase CsPbBr 3 /CsPb 2 Br 5 NCs could be synthesized via hot-injection, [200][201][202] re-precipitation, [203] ligand treatment, [204] and moisture treatment. [161] The first instance of a CsPbBr 3 /CsPb 2 Br 5 dual-phase composite was developed by a hot-injection method, which was carried out at a lower temperature compared to that of CsPbBr 3 NCs. [203] The composite was confirmed to be CsPbBr 3 NCs with CsPb 2 Br 5 nanoparticle imbedded.…”

Section: Nanosized Compositesmentioning

confidence: 99%

“…Published by John Wiley & Sons Austrialia, Ltd on behalf of UESTC. [200] CsPbBr 3 in Cs 4 PbBr 6 NCs ITO/PEDOT:PSS/poly-TPD/EL/TPBi/LiF/Al 514 3.5 × 10 −3 850 -2017 [180] CsPb 2 I 5 film ITO/PEDOT:PSS/EL/TPBi/LiF/Al 693 0.14 --2017 [96] CsPb 2 Br 5 film ITO/PEDOT:PSS/EL/TPBi/LiF/Al 520 1.1 7317 -2017 [96] PEA 2 Cs n−1 Pb n Br 3n+1 /Cs 4 PbBr 6 film ITO/PEDOT:PSS:PFI/EL/TPBi/LiF/Al 500 4.51 3259 2.8 2018 [206] CsPbBr 3 /CsPb 2 Br 5 NCs ITO/poly-TPD/PVK/EL/PO-T2T/LiF/Al 518 0.6 8383 2.5 2018 [203] CsPbBr 3 /Cs 4 PbBr 6 film ITO/PEDOT:PSS/EL/TPBi/LiF/Al 525 0.36 --2019 [35] PEA 2 Csn −1 Pb n Br 3n+1 /CsPbBr 3 film ITO/PVK/EL/TPBi/LiF/Al 512 12.7 8457 -2019 [207] PEA 2 Cs n−1 Pb n Br 3n+1 /Cs 4 PbBr 6 film ITO/PVK/EL/TPBi/LiF/Al 484 0.13 45 -2019 [207] CsPbBr 3 /Cs 4 PbBr 6 film ITO/PEDOT:PSS/EL/TPBi/LiF/Al 519 2.5 55 000 2.86 2019 [175] CsPbBr 3 /Cs 4 PbBr 6 film ITO/PEDOT:PSS/EL/TPBi/NiO x /Al 516 3.26 9442 4.2 2019 [117] Cs 4 PbBr 6 NCs ITO/PEDOT:PSS/EL/TPBi/LiF/Al 520 1.21 1942 -2019 [146] CsPbBr 3 in CsPb 2 Br 5 NCs ITO/PVK/EL/TPBi/LiF/Al 525 0.3 904 -2019 [161] ITO/PEDOT:PSS/CsPb 2 Br 5 /TPBi/LiF/Al structure. No significant energy barrier at the PEDOT:PSS/CsPb 2 Br 5 and CsPb 2 Br 5 / TPBi interfaces could be observed, suggesting the possibility of hole and electron injection into CsPb 2 Br 5 .…”

Section: Ledsmentioning

confidence: 99%

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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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“…Although the highly uniform thin film can be easily obtained, the crystal growth is hard to control in solid‐phase, and the thin films tend to be polycrystalline due to the low chemical forming energy. [ 16 ] Second, the vapor pressure of each component may have a huge difference, especially for long‐chain spacers, [ 10a,17 ] thus there is a large evaporation rate disparity among different materials. [ 13c,18 ] Third, neither crystalline defects nor lattice mismatch can be easily avoided via PVD.…”

Section: Introductionmentioning

confidence: 99%

Scalable All‐Evaporation Fabrication of Efficient Light‐Emitting Diodes with Hybrid 2D–3D Perovskite Nanostructures

Zhang

et al. 2020

Adv Funct Materials

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Quasi-2D (Q2D) lead halide perovskites have emerged as promising materials for light-emitting diodes (LEDs) due to their tunable emission, sloweddown carrier diffusion, and improved stability. However, they are primarily fabricated through solution methods, which hinders its large-scale manufacture and practical applications. Physical-vapor-deposition (PVD) methods have well demonstrated the capability for reproducible, scalable, and layerby-layer fabrication of high quality organic/inorganic thin films. Herein, for the first time, the full-evaporation fabrication of organic-inorganic hybrid ((BA) 2 Cs n−1 Pb n Br 3n+1) Q2D-3D PeLEDs is demonstrated. The morphology and crystal phase of the perovskite are controlled from 3D to 2D by modulating material composition, annealing temperature, and film thicknesses. The confinement of carriers in 3D layers and the energy funnel effect are discovered and discussed. Importantly, a record high external quantum efficiency (EQE) of 5.3% based on evaporation method is achieved. Moreover, a centimeterscale PeLED (1.5 cm × 2 cm) is obtained. Furthermore, the T 50 lifetime of the device with an initial brightness of 100 cd m −2 is found to be 90 min with a thin layer PMMA passivation, which is among the longest for all PVD processed PeLEDs. Overall, this work casts a solid stepping stone towards the fabrication of high-performance PeLEDs on a large-scale.

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Ultrastable and Reversible Fluorescent Perovskite Films Used for Flexible Instantaneous Display

Cited by 63 publications

References 40 publications

Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature

Mixed-Solvent Polarity-Assisted Phase Transition of Cesium Lead Halide Perovskite Nanocrystals with Improved Stability at Room Temperature

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

Scalable All‐Evaporation Fabrication of Efficient Light‐Emitting Diodes with Hybrid 2D–3D Perovskite Nanostructures

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