ArticleACS energy letters2022
The Origin of Broad Emission in ⟨100⟩ Two-Dimensional Perovskites: Extrinsic vs Intrinsic Processes.
Article in ACS energy letters, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed.
- Low-Temperature Melting-Crystallization Transition in Perovskites With Self-Trapped Excitons for Photovoltaic Downconversion.Advanced materials (Deerfield Beach, Fla.) · 2026Article
- Review
- Single-photon emission from two-dimensional perovskites channeled through low-energy edge states.Nature communications · 2026Article
- Liquid Surface Synthesis of Ultrathin Two-Dimensional Metal Halide Perovskite.ACS materials letters · 2026Article
- Tuning Self-Trapped Exciton Emission in 1D White-Light Emitting Perovskites Through Halide Composition and Synthesis Route.ACS omega · 2025Article
- Revisiting Sub-Band Gap Emission Mechanism in 2D Halide Perovskites: The Role of Defect States.Journal of the American Chemical Society · 2024Article
- Temperature-Dependent Structural and Optoelectronic Properties of the Layered Perovskite 2-Thiophenemethylammonium Lead Iodide.The journal of physical chemistry. C, Nanomaterials and interfaces · 2024Article
- Mechanochemically-induced glass formation from two-dimensional hybrid organic-inorganic perovskites.Chemical science · 2024Article
- Defects in Halide Perovskites: Does It Help to Switch from 3D to 2D?ACS energy letters · 2024Article
- Dynamics of self-hybridized exciton-polaritons in 2D halide perovskites.Light, science & applications · 2024Article
- How Does Local Strain Affect Stokes Shifts in Halide Double Perovskite Nanocrystals?Chemistry of materials : a publication of the American Chemical Society · 2023Article
- Origin of Broad Emission Induced by Rigid Aromatic Ditopic Cations in Low-Dimensional Metal Halide Perovskites.The journal of physical chemistry letters · 2023Article
- AThe journal of physical chemistry. C, Nanomaterials and interfaces · 2023Article
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
2D metal halide perovskites can show narrow and broad emission bands (BEs), and the latter's origin is hotly debated. A widespread opinion assigns BEs to the recombination of intrinsic self-trapped excitons (STEs), whereas recent studies indicate they can have an extrinsic defect-related origin. Here, we carry out a combined experimental-computational study into the microscopic origin of BEs for a series of prototypical phenylethylammonium-based 2D perovskites, comprising different metals (Pb, Sn) and halides (I, Br, Cl). Photoluminescence spectroscopy reveals that all of the compounds exhibit BEs. Where not observable at room temperature, the BE signature emerges upon cooling. By means of DFT calculations, we demonstrate that emission from halide vacancies is compatible with the experimentally observed features. Emission from STEs may only contribute to the BE in the wide-band-gap Br- and Cl-based compounds. Our work paves the way toward a complete understanding of broad emission bands in halide perovskites that will facilitate the fabrication of efficient narrow and white light emitting devices.
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