Surface Effects on Anisotropic Photoluminescence in One-Dimensional Halide Perovskites

ORAL

Abstract

One-dimensional (1D) hybrid organic-inorganic perovskites exhibit strongly anisotropic optical properties, highly efficient light emission, and large Stokes shift, holding promises for novel photo-detection and lighting applications. However, the fundamental mechanisms governing their unique optical properties and in particular the impacts of surface effects are not understood. Here, we investigate C4N2H14PbBr4 by polarization dependent time-averaged and time-resolved PL (TRPL) spectroscopy, as a function of photoexcitation energy. Surprisingly, we found that the emission under photoexcitation polarization parallel to the 1D molecular chain can be either stronger or weaker than that under perpendicular polarization, depending on the excitation energy. We attribute the excitation energy dependent anisotropic PL to fast nonradiative surface recombination, as supported by TRPL measurements and first principles calculations. Our comprehensive studies provide a more complete picture for a deeper understanding of the optical anisotropy in 1D perovskites.

*L. M. acknowledges the DOE SCGSR fellowship and UC-National lab in-residence graduate fellowship. The TRPL work was performed at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is managed by Triad National Security, LLC for the U.S. Department of Energy's NNSA, under contract 89233218CNA000001.

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Publication: Manuscript submitted

Presenters

  • Luke McClintock

    • University of California, Davis

Authors

  • Luke McClintock

    • University of California, Davis

  • Long Yuan

    • CINT

  • Ziyi Song

    • UC Davis

  • Michael T Pettes

    • Los Alamos National Laboratory
    • LANL
    • Los Alamos National Lab
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Dmitry A Yarotski

    • LANL
    • Los Alamos National Laboratory

  • Rijan Karkee

    • University of California, Merced

  • David A Strubbe

    • University of California, Merced

  • Liang Tan

    • Lawrence Berkeley National Laboratory
    • Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
    • Lawrence Berkeley National Laboratory,USA

  • Azza Ben Akacha

    • FSU

  • Biwu Ma

    • FSU
    • Florida State University

  • Yunshu Shi

    • University of California, Davis

  • Valentin Taufour

    • UC Davis
    • University of California, Davis

  • Dong Yu

    • University of California, Davis