Structural Signature in Stokes-shifted Broad Emission of Solution-Processed Hybrid Lead Perovskites

Structural Signature in Stokes-shifted Broad Emission of Solution-Processed Hybrid Lead Perovskites | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Structural Signature in Stokes-shifted Broad Emission of Solution-Processed Hybrid Lead Perovskites Mrinmay Mukhopadhyay, Subhadip Chowdhury, Milan Sanyal, Satyaban Bhunia This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7070980/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 06 Dec, 2025 Read the published version in Communications Materials → Version 1 posted You are reading this latest preprint version Abstract Technologically important layered lead halide compounds belong to a large family of hybrid organic-inorganic perovskite (HOIP) materials, which show a wide range of optical properties due to the flexible combination of organic and inorganic components in the crystal structure. Understanding the emission process of Stokes-shifted broad photoluminescence (PL) in HOIPs is important for both fundamental science and applications. We present here the results of temperature-dependent PL, X-ray diffraction, and Raman studies of solution-processed (BA) 2 PbCl 4 flakes to unveil the structural signature of the self-trapped exciton mechanism that explains the observed Stokes shift of broad PL in HOIPs. The two-dimensional nature of these flakes is important, as perovskite powders made from these flakes do not show prominent shift in PL and X-ray diffraction peak positions as the temperature reduces. Increase in the laser-excitation intensity produce similar redshift in PL peak position. We also present sharp and intense PL spectra obtained from nano-films of Lead-Formate perovskites prepared from the Langmuir monolayer of Stearic acid over solution of these flakes. Physical sciences/Materials science/Nanoscale materials/Organic–inorganic nanostructures Physical sciences/Materials science/Condensed-matter physics/Surfaces, interfaces and thin films Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupportingInformationSubhadipperovskite.docx Supplementary Information Cite Share Download PDF Status: Published Journal Publication published 06 Dec, 2025 Read the published version in Communications Materials → Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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