Synthesis of stable and phase-adjustable CsPbBr3@Cs4PbBr6 nanocrystals via novel anion–cation reactions

Xu, Leimeng; Li, Jianhai; Fang, Tao; Zhao, Yongli; Yuan, Shichen; Dong, Yue; Song, Jizhong

doi:10.1039/c8na00291f

Cited by 70 publications

(64 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In traditional dual-source vacuum deposition process, the CsBr and PbBr 2 precursors are deposited on the substrate by controlling the thickness followed by the annealing process to form CsPbBr 3 film (Fig. 12a) Further, Hua et al [126] reported the pressure assisted multi-step sequential dual-source vacuum deposition (MS-DSVD) method to prepare compact CsPbBr 3 perovskite films ( poly-triarylamine (PTAA) [78,95] or NiO x [79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97] are the commonly used as HTLs.…”

Section: Sequential Evaporation Methodsmentioning

confidence: 99%

All-inorganic CsPbBr₃ perovskite: a promising choice for photovoltaics

et al. 2021

View full text Add to dashboard Cite

show abstract

Section: Sequential Evaporation Methodsmentioning

confidence: 99%

All-inorganic CsPbBr₃ perovskite: a promising choice for photovoltaics

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In addition to the enhanced optical properties, the durability of CsPbBr 3 NCs was significantly improved by the introduction of Cs 4 PbBr 6 , one such feature being their thermal stability. [189][190][191][192] In a heating and cooling cycle, the PL intensity of pristine CsPbBr 3 and CsPbBr 3 /Cs 4 PbBr 6 composite was quenched as the temperature increased. During the cooling procedure, the quenching was gradually recovered, but never recovers to the original state.…”

Section: Nanosized Compositementioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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...

show abstract

“…[9,34] A quite different approach involves CsPbBr 3 NCs being embedded in a Cs 4 PbBr 6 matrix with a crystal size of several hundred nanometers or more, resulting in improved PLQY and stability. [35][36][37][38] However, the literature reports in this area have been focused only on green emission, and Cs 4 PbBr 6 /CsPbBr 3 embedded structures are not suitable for electroluminescent devices because a 0D Cs 4 PbBr 6 phase has a wide bandgap of 3.95 eV and is insulating. [39,40] In this article, we report a unique method to enhance the PLQY and stability of blue-emitting CsPbBr 3 QDs via simultaneous generation of mixed CsPbBr 3 QDs and Cs 4 PbBr 6 NCs.…”

Section: Introductionmentioning

confidence: 99%

Highly Emissive Blue Quantum Dots with Superior Thermal Stability via In Situ Surface Reconstruction of Mixed CsPbBr₃–Cs₄PbBr₆ Nanocrystals

Kim

Lee

et al. 2021

Advanced Science

View full text Add to dashboard Cite

Although metal halide perovskites are candidate high-performance light-emitting diode (LED) materials, blue perovskite LEDs are problematic: mixed-halide materials are susceptible to phase segregation and bromide-based perovskite quantum dots (QDs) have low stability. Herein, a novel strategy for highly efficient, stable cesium lead bromide (CsPbBr 3 ) QDs via in situ surface reconstruction of CsPbBr 3 -Cs 4 PbBr 6 nanocrystals (NCs) is reported. By controlling precursor reactivity, the ratio of CsPbBr 3 to Cs 4 PbBr 6 NCs is successfully modulated. A high photoluminescence quantum yield (PLQY) of >90% at 470 nm is obtained because octahedron CsPbBr 3 QD surface defects are removed by the Cs 4 PbBr 6 NCs. The defect-engineered QDs exhibit high colloidal stability, retaining >90% of their initial PLQY after >120 days of ambient storage. Furthermore, thermal stability is demonstrated by a lack of heat-induced aggregation at 120 °C. Blue LEDs fabricated from CsPbBr 3 QDs with reconstructed surfaces exhibit a maximum external quantum efficiency of 4.65% at 480 nm and excellent spectral stability.

show abstract

Synthesis of stable and phase-adjustable CsPbBr₃@Cs₄PbBr₆ nanocrystals via novel anion–cation reactions

Abstract: In this study, a novel anion–cation method to synthesize highly emissive and stable diphase CsPbBr3@Cs4PbBr6 composite NCs has been developed.

Cited by 70 publications

References 49 publications

All-inorganic CsPbBr₃ perovskite: a promising choice for photovoltaics

All-inorganic CsPbBr₃ perovskite: a promising choice for photovoltaics

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

Highly Emissive Blue Quantum Dots with Superior Thermal Stability via In Situ Surface Reconstruction of Mixed CsPbBr₃–Cs₄PbBr₆ Nanocrystals

Contact Info

Product

Resources

About

Synthesis of stable and phase-adjustable CsPbBr3@Cs4PbBr6 nanocrystals via novel anion–cation reactions

Abstract: In this study, a novel anion–cation method to synthesize highly emissive and stable diphase CsPbBr3@Cs4PbBr6 composite NCs has been developed.

Cited by 70 publications

References 49 publications

All-inorganic CsPbBr3 perovskite: a promising choice for photovoltaics

All-inorganic CsPbBr3 perovskite: a promising choice for photovoltaics

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

Highly Emissive Blue Quantum Dots with Superior Thermal Stability via In Situ Surface Reconstruction of Mixed CsPbBr3–Cs4PbBr6 Nanocrystals

Contact Info

Product

Resources

About

Synthesis of stable and phase-adjustable CsPbBr₃@Cs₄PbBr₆ nanocrystals via novel anion–cation reactions

All-inorganic CsPbBr₃ perovskite: a promising choice for photovoltaics

All-inorganic CsPbBr₃ perovskite: a promising choice for photovoltaics

Highly Emissive Blue Quantum Dots with Superior Thermal Stability via In Situ Surface Reconstruction of Mixed CsPbBr₃–Cs₄PbBr₆ Nanocrystals