Illumination-Induced Transparency in 2D Layered Perovskites via Lattice Energy Reservoirs

Illumination-Induced Transparency in 2D Layered Perovskites via Lattice Energy Reservoirs | 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 Illumination-Induced Transparency in 2D Layered Perovskites via Lattice Energy Reservoirs Xiaoming Wen, Chunhua Zhou, Junlin Lu, Mehri Ghasemi, Zhixing Gan, and 4 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7315587/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract We report the first observation of illumination-induced transparency (IIT) in two-dimensional Ruddlesden-Popper halide perovskite single crystals. Under continuous excitation, the crystal becomes progressively transparent to its own photoluminescence (PL), particularly near the absorption edge where reabsorption is initially strong. The effect evolves over seconds, shows an excitation fluence threshold and persistence. We attribute IIT to the activation of lattice energy reservoirs (LERs), which are spatially non-uniform nanodomains that store phonon energy as elastic potential under optical excitation. These LERs enable subgap carrier upconversion thus generate photon gain that compensates the intrinsic absorption. The effect reveals a previously unrecognized optoelectronic behavior in 2D perovskites, governed by dynamic lattice–carrier interactions rather than electronic band filling. This phenomenon demonstrates a new light–matter interaction regime in perovskites and highlights LERs as optically accessible energy gateways. Our findings suggest new routes toward photon-recycling, upconversion, and reconfigurable photonic materials based on soft-lattice semiconductors. Physical sciences/Optics and photonics/Optical physics Physical sciences/Materials science/Condensed-matter physics illumination-induced transparency lattice energy reservoirs 2D Ruddlesden-Popper perovskites photoluminescence enhancement light-matter interaction Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SIforIIT20250718.docx Supplementary Information Cite Share Download PDF Status: Posted 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. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7315587","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":512430026,"identity":"dac46442-b3cd-4d05-b53b-52af0909a7f5","order_by":0,"name":"Xiaoming 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