Modulation of Broadband Emissions in Two-Dimensional â ¨100â ©-Oriented Ruddlesden-Popper Hybrid Perovskites

Jun Yin, Rounak Naphade, Luis Gutiérrez Arzaluz, Jean Luc Brédas, Osman M. Bakr, Omar F. Mohammed

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2149-2155
Number of pages7
JournalACS Energy Letters
Volume5
Issue number7
DOIs
Publication statusPublished - 10 Jul 2020

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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