Modulation of Broadband Emissions in Two-Dimensional ⟨100⟩-Oriented Ruddlesden–Popper Hybrid Perovskites
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Yin, JunNaphade, Rounak
Gutiérrez Arzaluz, Luis
Brédas, Jean-Luc
Bakr, Osman M.
Mohammed, Omar F.
Affiliation
Univ Arizona, Dept Chem & BiochemIssue Date
2020-05-28
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AMER CHEMICAL SOCCitation
ACS Energy Lett. 2020, 5, XXX, 2149–2155Journal
ACS Energy LettersRights
Copyright © 2020 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Two-dimensional (2D) Ruddlesden–Popper (RP) perovskites are emerging materials for light-emitting applications. Unfortunately, their desirable narrowband emission coexists with broadband emissions, which limits the color quality and performance of the light source. However, the origin of such broadband emission in ⟨100⟩-oriented perovskites is still under debate. Here, we experimentally and theoretically demonstrate that unlike ⟨110⟩-oriented RP perovskites, the broadband emission of the 2D ⟨100⟩-oriented RP (PEA)2PbI4 (PEA = C6H5C2H4NH3+) perovskites originates from defect-related luminescence centers. We find that the broadband emission of this prototype 2D structure can be largely suppressed by using excess PEAI treatment. Density functional theory (DFT) calculations indicate that iodine (I) vacancies both in the bulk and on the surface are responsible for the broadband emission. We attribute the decreased broadband emission after PEAI treatment to the passivation of both undercoordinated Pb2+ ions on the surface and I vacancies in the bulk through I– ion migration.Note
Open access articleISSN
2380-8195EISSN
2380-8195Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1021/acsenergylett.0c01047
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Except where otherwise noted, this item's license is described as Copyright © 2020 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License.