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Title: | Single-Step Synthesis of Dual Phase Bright Blue-Green Emitting Lead Halide Perovskite Nanocrystal Thin Films | Authors: | Bhatia, Harshita Steele, Julian A. Martin, Cristina Keshavarz, Masoumeh Solis-Fernandez, Guillermo Yuan, Haifen Fleury, Guillaume Huang, Haowei Dovgaliuk, Iurii Chernyshov, Dmitry HENDRIX, Jelle Roeffaers, Maarten B. J. Hofkens, Johan Debroye, Elke |
Issue Date: | 2019 | Publisher: | AMER CHEMICAL SOC | Source: | CHEMISTRY OF MATERIALS, 31(17), p. 6824-6832 | Abstract: | Metal trihalide perovskites are rapidly redefining the landscape of solid-state semiconductors utilized as an active medium in photovoltaics and in light generation. Within this materials space, organic-inorganic hybrid formamidinium lead bromide (FAPbBr(3)) has arisen as a promising candidate for efferent light emitting devices, due to its capacity for sharp and bright green light emissions (530 nm). Herein we have applied a facile single-step ligand-mediated method for phase-controlled synthesis of FAPbBr(3) cube- and rod-shaped nanocrystals (NCs), starting from different ratios of precursor agents. Examining their structural and optoelectronic properties-using a combination of synchrotron X-ray diffraction, X-ray spectroscopy, scanning electron microscopy, and steady-state and time-resolved photoluminescence (PL)-we reveal the two NC types to fundamentally differ. While the cube-shaped NCs exhibit properties aligning with those of bulk FAPbBr(3), the nanorods exhibit a two-phase microstructure and the coexistence of both a typical cubic perovskite structure alongside the formation of a new low-symmetry monoclinic phase (P2/m). Further, the two-phase nanorods display a bright dual PL emission (peaks centered near 490 and 530 nm) and complex luminescence dynamics, properties characteristic of quasi-2D perovskites. The two phase nanorod generation can be assigned to the proton exchange in the presence of excess of FA(+) during the synthesis. | Notes: | [Bhatia, Harshita; Martin, Cristina; Keshavarz, Masoumeh; Solis-Fernandez, Guillermo; Yuan, Haifen; Hendrix, Jelle; Hofkens, Johan; Debroye, Elke] Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200F, B-3001 Leuven, Belgium. [Steele, Julian A.; Fleury, Guillaume; Huang, Haowei; Roeffaers, Maarten B. J.] Katholieke Univ Leuven, Dept Microbial & Mol Syst, Ctr Surface Chem & Catalysis, B-3001 Leuven, Belgium. [Martin, Cristina] Univ Castilla La Mancha, Fac Farm, Dept Quim Fis, Albacete 02071, Spain. [Dovgaliuk, Iurii; Chernyshov, Dmitry] Swiss Norwegian Beamlines European Synchrotron Ra, 71 Ave Martyrs, F-38000 Grenoble, France. [Hendrix, Jelle] Hasselt Univ, Dynam Bioimaging Lab, Adv Opt Microscopy Ctr, Agoralaan C BIOMED, B-3590 Diepenbeek, Belgium. [Hendrix, Jelle] Hasselt Univ, Biomed Res Inst, Agoralaan C BIOMED, B-3590 Diepenbeek, Belgium. | Document URI: | http://hdl.handle.net/1942/29813 | ISSN: | 0897-4756 | e-ISSN: | 1520-5002 | DOI: | 10.1021/acs.chemmater.9b01277 | ISI #: | 000485830300051 | Rights: | American Chemical Society. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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bhatia 1.pdf Restricted Access | Published version | 2.99 MB | Adobe PDF | View/Open Request a copy |
bhatia2019.pdf | Peer-reviewed author version | 1.35 MB | Adobe PDF | View/Open |
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