Compositionally Dependent Phase Identity of Colloidal CsPbBr3–xIx Quantum Dots

Cottingham, Patrick; Brutchey, Richard L.

doi:10.1021/acs.chemmater.6b03553

Cited by 59 publications

(63 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[63] CsPbX 3 bulk crystals crystallize as cubic, orthorhombic, and tetragonal polymorphs of the perovskite lattice, which is related to the total system energy and environment temperature. [22,34,36,58,69,77,79,[105][106][107][108] Here, we take CsPbBr 3 NCs as an example to reveal phase identity and phase transformation. More recently, the crystal structure issues of CsPbX 3 NCs with various shapes have been widely investigated.…”

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

“…[105] In a word, during the conversion of CsPbBr 3 NCs into CsPbI 3 or CsPbCl 3 via anion-exchange method, the parent CsPbBr 3 retains cubic or orthorhombic structure. [107] indicating that CsPbBr 3−x I x QDs do not form a continuous solid solution over the entire composition range from 0 ≤ x ≤ 3. [108] This finding is consistent with ref.…”

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

“…Nevertheless, Yang's group found that the phase transforms from cubic to orthorhombic by increasing the inserted level of I − anions of CsPbBr 3−x I x NCs. [64,106,107] [107] indicating that CsPbBr 3−x I x QDs do not form a continuous solid solution over the entire composition range from 0 ≤ x ≤ 3.…”

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

“…More recently, the crystal structure issues of CsPbX 3 NCs with various shapes have been widely investigated. [22,34,36,58,69,77,79,[105][106][107][108] Here, we take CsPbBr 3 NCs as an example to reveal phase identity and phase transformation. Similar to bulk crystals, CsPbBr 3 NCs possess the cubic phase (space group, Pm-3m) by direct synthesis at higher temperature of 160−200 °C, which can be attributed to the combined effect of the high reaction temperature and contributions from the surface energy.…”

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

“…[108] This finding is consistent with ref. [107] indicating that CsPbBr 3−x I x QDs do not form a continuous solid solution over the entire composition range from 0 ≤ x ≤ 3. Obviously, this contradictory scenario seems to hinder the understanding structure-property relationships of trihalide perovskite NCs.…”

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

See 4 more Smart Citations

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

2017

View full text Add to dashboard Cite

All-inorganic trihalide perovskite nanocrystals (NCs) are emerging as a new class of superstar semiconductors with excellent optoelectronic properties and great potential for a broad range of applications in lighting, lasing, photon detection, and photovoltaics. This article provides an up-to-date review on the developments of fully-inorganic trihalide perovskite NCs by emphasizing their controllable solution fabrication strategies, structural phase transformation, tunable optoelectronic properties, stability, as well as their photovoltaic and optoelectronic applications. Among the properties to be surveyed, particular focus is on the size-, shape-, and composition-dependent photoluminescence properties. Finally, by identifying new challenges, suggestions are provided for further research and potential development of this area.

show abstract

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

Section: Crystal Structure and Phase Transitionmentioning

confidence: 99%

See 3 more Smart Citations

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

2017

View full text Add to dashboard Cite

show abstract

Imaging Beam‐Sensitive Materials by Electron Microscopy

et al. 2020

View full text Add to dashboard Cite

Electron microscopy allows the extraction of multidimensional spatiotemporally correlated structural information of diverse materials down to atomic resolution, which is essential for figuring out their structureproperty relationships. Unfortunately, the high-energy electrons that carry this important information can cause damage by modulating the structures of the materials. This has become a significant problem concerning the recent boost in materials science applications of a wide range of beam-sensitive materials, including metal-organic frameworks, covalent-organic frameworks, organicinorganic hybrid materials, 2D materials, and zeolites. To this end, developing electron microscopy techniques that minimize the electron beam damage for the extraction of intrinsic structural information turns out to be a compelling but challenging need. This article provides a comprehensive review on the revolutionary strategies toward the electron microscopic imaging of beamsensitive materials and associated materials science discoveries, based on the principles of electron-matter interaction and mechanisms of electron beam damage. Finally, perspectives and future trends in this field are put forward. he worked as a postdoctoral fellow and research scientist at King Abdullah University of Science and Technology. His research interests now focus on low-dose electron microscopy and structural elucidation of beam-sensitive materials for applications such as catalysis, gas separation, and energy conversion/storage.

show abstract

High Stability and Strong Luminescence CsPbBr₃/Cs₄PbBr₆ Perovskite Nanocomposite: Large‐Scale Synthesis, Reversible Luminescence, and Anti‐Counterfeiting Application

Wang

Zhang

Liu

et al. 2021

Adv Materials Technologies

View full text Add to dashboard Cite

that requires a relatively high temperature, as Kovalenko and co-workers reported, [7] which works only at the laboratory scale but does not apply to scale-up production. Second, because of their inherent ionic nature, IPQDs suffer from low chemical stability, resulting in fast degradation when exposed to moisture, heat, and light irradiance. Last, the PLQY of IPQDs drops sharply when perovskites are extracted from the crude solution to form a condensed solid. This is due to the rapid desorption of the ligands loosely coordinated with the material surface, [8] which accelerates ion migration between inter-particles, increases non-radioactive Auger recombination, and fluorescence quenching. [9][10][11] In short, finding a facile approach to obtain solid CsPbX 3 QDs with high stability and PLQY still requires significant effort.Various strategies have been applied to enhance the structural stability of QDs using the appropriate surface passivation or encapsulate technology. For example, the stabilities of the CsPbBr 3 QDs have been improved by coating them into inert shells (CsBr, [1] Cs 4 PbBr 6 , [12][13][14][15] CdS, [16] and ZnS [17] ), mesoporous materials (silica molecular sieve, [18] mesoporous silica, [19,20] and metal-organic frameworks [21,22] ), inorganic oxides (Al 2 O 3 , [23,24] SiO 2 , [25,26] Al 2 O 3 /SiO 2 , [27] TiO 2 , [28] and ZrO 2 [29] ), and polymer matrixes (polystyrene, [30] polymethyl methacrylate, [31] polyvinylidene fluoride, [32] and thermoplastic polyurethane [33] ). However, these methods require elaborate processes and show the attenuated PLQY. Conversely, recent studies prove that the 0-D cousins (Cs 4 PbBr 6 ) of CsPbBr 3 possess high PLQY and good stability, [34,35] which inspires us to design a CsPbBr 3 /Cs 4 PbBr 6 heterostructure. [12][13][14][15] Meanwhile, using the wide-band-gap Cs 4 PbBr 6 matrix to coat the CsPbBr 3 QDs, more carriers can be easily confined to the CsPbBr 3 region, reducing the probability of electron leakage [16] and improving the optical-electrical properties. Finally, room temperature supersaturation method is very efficient in the synthesis of perovskite.In this paper, we propose a facile low-temperature selfassembly strategy to synthesize the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite with a PLQY of 72% and a product yield of 87%. A series of characterization experiments have been carried out to confirm the formation of the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite. Meanwhile, the PL spectra and time-resolved PL decay curves have been collected. We observed that the Cs 4 PbBr 6In this study, a simple low-temperature self-assembly strategy is used to synthesize the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite with a relatively high photoluminescence quantum yield (PLQY, 72%) and product yield (87%). As expected, the nanocomposite exhibits good photoluminescence (PL) performance and stability. Further, 90% of the PLQY is maintained even when heating at 100 °C for 24 h, and almost no emission degradation is observed after storage in ethanol for 10 days. Furthermore, the prepa...

show abstract

Compositionally Dependent Phase Identity of Colloidal CsPbBr_3–xI_x Quantum Dots

Cited by 59 publications

References 25 publications

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Imaging Beam‐Sensitive Materials by Electron Microscopy

High Stability and Strong Luminescence CsPbBr₃/Cs₄PbBr₆ Perovskite Nanocomposite: Large‐Scale Synthesis, Reversible Luminescence, and Anti‐Counterfeiting Application

Contact Info

Product

Resources

About

Compositionally Dependent Phase Identity of Colloidal CsPbBr3–xIx Quantum Dots

Cited by 59 publications

References 25 publications

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Imaging Beam‐Sensitive Materials by Electron Microscopy

High Stability and Strong Luminescence CsPbBr3/Cs4PbBr6 Perovskite Nanocomposite: Large‐Scale Synthesis, Reversible Luminescence, and Anti‐Counterfeiting Application

Contact Info

Product

Resources

About

Compositionally Dependent Phase Identity of Colloidal CsPbBr_3–xI_x Quantum Dots

High Stability and Strong Luminescence CsPbBr₃/Cs₄PbBr₆ Perovskite Nanocomposite: Large‐Scale Synthesis, Reversible Luminescence, and Anti‐Counterfeiting Application