Dark and Bright Excitons in Halide Perovskite Nanoplatelets

Gramlich, Moritz; Swift, Michael W.; Lampe, Carola; Lyons, John L.; Döblinger, Markus; Efros, Alexander L.; Sercel, Peter C.; Urban, Alexander S.

doi:10.1002/advs.202103013

Title: Dark and Bright Excitons in Halide Perovskite Nanoplatelets

Journal Article · 23 December 2021 · Advanced Science

DOI: https://doi.org/10.1002/advs.202103013 · OSTI ID:1981365

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^[2]; Lampe, Carola ^[1];

^[2]; Döblinger, Markus ^[1];

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Ludwig Maximilian Univ. of Munich, Munich (Germany)
Naval Research Lab. (NRL), Washington, DC (United States)
Center for Hybrid Organic Inorganic Semiconductors for Energy, Golden, CO (United States)

Semiconductor nanoplatelets (NPLs), with their large exciton binding energy, narrow photoluminescence (PL), and absence of dielectric screening for photons emitted normal to the NPL surface, could be expected to become the fastest luminophores amongst all colloidal nanostructures. However, super-fast emission is suppressed by a dark (optically passive) exciton ground state, substantially split from a higher-lying bright (optically active) state. Here, the exciton fine structure in 2-8 monolayer (ML) thick Cs_{n - 1}Pb_nBr_{3n + 1}NPLs is revealed by merging temperature-resolved PL spectra and time-resolved PL decay with an effective mass model taking quantum confinement and dielectric confinement anisotropy into account. This approach exposes a thickness-dependent bright-dark exciton splitting reaching 32.3 meV for the 2 ML NPLs. The model also reveals a 5-16 meV splitting of the bright exciton states with transition dipoles polarized parallel and perpendicular to the NPL surfaces, the order of which is reversed for the thinnest NPLs, as confirmed by TR-PL measurements. Accordingly, the individual bright states must be taken into account, while the dark exciton state strongly affects the optical properties of the thinnest NPLs even at room temperature. Significantly, the derived model can be generalized for any isotropically or anisotropically confined nanostructure.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE)

Sponsoring Organization:: USDOE

OSTI ID:: 1981365

Journal Information:: Advanced Science, Journal Name: Advanced Science Journal Issue: 5 Vol. 9; ISSN 2198-3844

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Dark and Bright Excitons in Halide Perovskite Nanoplatelets

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