Microscopic origin of multiple exciton emission in low-dimensional lead halide perovskites

Du, Mao-Hua

doi:10.1063/1.5127933

Title: Microscopic origin of multiple exciton emission in low-dimensional lead halide perovskites

Journal Article · Wed Nov 13 00:00:00 EST 2019 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.5127933· OSTI ID:1606921

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Low-dimensional halide perovskites exhibit intriguing excitonic properties and emerge as an important class of self-activated luminescent materials. However, the ability to manipulate and optimize their luminescent properties is limited by the lack of the microscopic understanding of the exciton relaxation and emission and the inconsistency in the theoretical results in the literature. In this work, based on first-principles calculations, we studied excitons in 1D lead halide perovskites, C₄N₂H₁₄PbBr₄ and C₄N₂H₁₄PbCl₄, which are both bright visible-light emitters. We find that, in both compounds, the polaron-pair exciton (EX-PP) is more stable than the onsite exciton (EX-OS) and only the EX-PP emission energy from the calculation is close to the main photoluminescence (PL) peak observed in the experiment. We note the EX-OS is found to emit UV light in both compounds. Therefore, the EX-PP is responsible for the experimentally observed visible light emission in both C₄N₂H₁₄PbBr₄ and C₄N₂H₁₄PbCl₄. Furthermore, the calculated small energy difference between the EX-PP and EX-OS in C₄N₂H₁₄PbBr₄ suggests that the metastable EX-OS can be thermally populated at room temperature (RT); the calculated EX-OS emission energy agrees well with the energy of a minor PL peak observed at RT but not at 77 K. The validity our approach in the exciton calculation is supported by the benchmark of the calculated exciton emission energies against the experimental results in 13 0D and 1D metal halides. The discrepancies between this work and a recent theoretical study in the literature are also discussed.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1606921

Alternate ID(s):: OSTI ID: 1574065

Journal Information:: Journal of Chemical Physics, Vol. 151, Issue 18; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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