Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology

Κωστοπούλου, Αθανασία; Brintakis, Konstantinos; Serpetzoglou, Efthymis; Stratakis, Emmanuel

doi:10.3390/nano10040747

Cited by 7 publications

(10 citation statements)

References 44 publications

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“…The debate was initiated by some early reports on pure Cs 4 PbBr 6 crystals with superior green luminescence without any profound considerations about the origin of such luminescence [ 29 , 30 ]. The origin of the green luminescence was questioned, and two major opinions appeared in research community; one strong opinion is that CsPbBr 3 nanoinclusions are, in fact, present in Cs 4 PbBr 6 crystals [ 25 , 31 , 32 , 33 ], as the bright green emission is associated with CsPbBr 3 nanocrystals. It has already been stated in 1999 by Nikl et al that it is difficult to suppress the presence of CsPbBr 3 in Cs 4 PbBr 6 completely [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

On the Role of Cs4PbBr6 Phase in the Luminescence Performance of Bright CsPbBr3 Nanocrystals

et al. 2021

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CsPbBr3 nanocrystals have been identified as a highly promising material for various optoelectronic applications. However, they tend to coexist with Cs4PbBr6 phase when the reaction conditions are not controlled carefully. It is therefore imperative to understand how the presence of this phase affects the luminescence performance of CsPbBr3 nanocrystals. We synthesized a mixed CsPbBr3-Cs4PbBr6 sample, and compared its photo- and radioluminescence properties, including timing characteristics, to the performance of pure CsPbBr3 nanocrystals. The possibility of energy transfer between the two phases was also explored. We demonstrated that the presence of Cs4PbBr6 causes significant drop in radioluminescence intensity of CsPbBr3 nanocrystals, which can limit possible future applications of Cs4PbBr6-CsPbBr3 mixtures or composites as scintillation detectors.

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Section: Introductionmentioning

confidence: 99%

On the Role of Cs4PbBr6 Phase in the Luminescence Performance of Bright CsPbBr3 Nanocrystals

et al. 2021

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“…A very recent report on these nanomaterials from our group revealed the coexistence of two phases Cs 4 PbBr 6 and CsPbBr 3 in each nanohexagon. 43 The corresponding HRTEM image and XRD pattern analyses in this report indicated that the coexistence of the two phases is also the reason behind the photoluminescence of the nanohexagons solution. 43…”

Section: Synthesis Of Photoluminescent Nanocrystalsmentioning

confidence: 52%

“…43 The corresponding HRTEM image and XRD pattern analyses in this report indicated that the coexistence of the two phases is also the reason behind the photoluminescence of the nanohexagons solution. 43…”

Section: Synthesis Of Photoluminescent Nanocrystalsmentioning

confidence: 52%

Highly luminescent and ultrastable cesium lead bromide perovskite patterns generated in phosphate glass matrices

et al. 2020

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“…In addition, laser-induced melting (mainly used to prepare bimetallic alloys) [15][16][17] or doping [18,19] in liquids have been proposed as effective methods to modify the nanocrystal stoichiometry. Finally, laser-triggered processes have been introduced to couple together two different nanomaterials, with examples including graphene, carbon nitride sheets and carbon nanotubes conjugated with different types of metallic and semiconducting nanocrystals [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Morphological and Structural Changes of Cesium Lead Bromide Nanocrystals

et al. 2022

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Metal halide perovskite nanocrystals, an emerging class of materials for advanced photonic and optoelectronic applications, are mainly fabricated with colloidal chemistry routes. On the quest for new properties according to application needs, new perovskite systems of various morphologies and levels of doping and alloying have been developed, often also involving post-synthesis reactions. Recently, laser irradiation in liquids has been utilized as a fast method to synthesize or transform materials and interesting laser-induced transformations on nanocrystals were induced. These studies in general have been limited to small nanocrystals (~15 nm). In the case of halide perovskites, fragmentation or anion exchange have been observed in such laser-based processes, but no crystal structure transformations were actually observed or deliberately studied. Nanocrystals are more sensitive to light exposure compared to the corresponding bulk crystals. Additional factors, such as size, morphology, the presence of impurities, and others, can intricately affect the photon absorption and heat dissipation in nanocrystal suspensions during laser irradiation. All these factors can play an important role in the final morphologies and in the time required for these transformations to unfold. In the present work, we have employed a 513 nm femtosecond (fs) laser to induce different transformations in large nanocrystals, in which two phases coexist in the same particle (Cs4PbBr6/CsPbBr3 nanohexagons of ~100 nm), dispersed in dichlorobenzene. These transformations include: (i) the exfoliation of the primary nanohexagons and partial anion exchange; (ii) fragmentation in smaller nanocubes and partial anion exchange; (iii) side-by-side-oriented attachment, fusion, and formation of nanoplatelets and complete anion exchange; (iv) side-by-side attachment, fusion, and formation of nanosheets. Partial or complete Br-Cl anion exchange in the above transformations was triggered by the partial degradation of dichlorobenzene. In addition to the detailed analysis of the various nanocrystal morphologies observed in the various transformations, the structure–photoluminescence relationships for the different samples were analyzed and discussed.

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Laser-Assisted Fabrication for Metal Halide Perovskite-2D Nanoconjugates: Control on the Nanocrystal Density and Morphology

Cited by 7 publications

References 44 publications

On the Role of Cs4PbBr6 Phase in the Luminescence Performance of Bright CsPbBr3 Nanocrystals

On the Role of Cs4PbBr6 Phase in the Luminescence Performance of Bright CsPbBr3 Nanocrystals

Highly luminescent and ultrastable cesium lead bromide perovskite patterns generated in phosphate glass matrices

Laser-Induced Morphological and Structural Changes of Cesium Lead Bromide Nanocrystals

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