Light Propagation and Radiative Exciton Transport in Two-Dimensional Layered Perovskite Microwires
Mohammed, Omar F.
Gartstein, Yuri N.
Malko, Anton V.
KAUST DepartmentKAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Material Science and Engineering Program
Chemical Science Program
KAUST Solar Center (KSC)
Embargo End Date2021-12-29
Permanent link to this recordhttp://hdl.handle.net/10754/666789
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AbstractLayered 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.
CitationZheng, Y., Naphade, R., Mondal, N., Bakr, O. M., Mohammed, O. F., Gartstein, Y. N., & Malko, A. V. (2020). Light Propagation and Radiative Exciton Transport in Two-Dimensional Layered Perovskite Microwires. ACS Photonics. doi:10.1021/acsphotonics.0c01479
SponsorsThe 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.
PublisherAmerican Chemical Society (ACS)