Light Propagation and Radiative Exciton Transport in Two-Dimensional Layered Perovskite Microwires

Yangzi Zheng, Rounak Naphade, Navendu Mondal, Osman Bakr, Omar F. Mohammed, Yuri N. Gartstein, Anton V. Malko

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Layered quasi-two-dimensional perovskites are promising candidates for optoelectronic applications exhibiting excitons with high emission quantum yields, high stability, and ease of bandgap tunability. Here, we demonstrate a long-range (∼100 μm) exciton transfer in a layered perovskite structure (en)4Pb2Br9·3Br, with the ethylene diammonium (en) as a spacer that takes place via the reabsorption of emitted photons. Using the two-objectives setup, we directly map the spatiotemporal dynamics of photoluminescence (PL) from perovskite microwires that reveal a clear spectroscopic signature of photon recycling: the appearance of PL emission rise times and the corresponding elongation of the PL decay as a function of separation distance between the excitation and emission locations. We further show that a kinetic model based on the photon-mediated mechanism of the lateral exciton propagation indeed successfully describes all the salient features of the experimental data and gives an independent assessment of the radiative efficiency of the exciton recombination. Our demonstration points out the possibility of judiciously exploiting light management strategies for future high-performance optoelectronic devices with layered perovskite structures.
Original languageEnglish (US)
Pages (from-to)276-282
Number of pages7
JournalACS Photonics
Issue number1
StatePublished - Dec 29 2020

Bibliographical note

KAUST Repository Item: Exported on 2021-11-24
Acknowledgements: The work at UT Dallas was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DESC0010697.

ASJC Scopus subject areas

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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