Influence of Solvent Effects on the Photophysical Properties of Europium Amino Acid Complexes

Influence of Solvent Effects on the Photophysical Properties of Europium Amino Acid Complexes | 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 Research Article Influence of Solvent Effects on the Photophysical Properties of Europium Amino Acid Complexes Rui Liang, Gerile Naren, Rui Meng, Ziyang Chen, Wei Zhang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7626845/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 Concentration quenching is mainly caused by energy transfer and cross relaxation between luminescent centers. As the concentration of luminescent centers increases, the distance between them decreases, making it easier for energy to be transferred or consumed, resulting in a reduction in luminescence intensity. In this paper, to reveal the influence of solvent effects on the luminescence properties of rare earth complexes, firstly, low-toxicity rare earth amino acid complex luminescent matrix materials such as europium octanoyl alaninate Eu(oct-ala) 3 , europium octanoyl phenylalaninate Eu(oct-phe) 3 , and europium octanoyl serine Eu(oct-ser) 3 were prepared through in-solution chemical reactions. Subsequently, ethanol solutions of rare earth complexes with different concentrations were prepared, and their photophysical properties such as infrared absorption spectra, ultraviolet-visible absorption spectra, and fluorescence spectra were tested. The study found that as the concentration increases, a red shift occurs in the ultraviolet-visible absorption peaks of the rare earth complex solutions. In addition, further research on fluorescence spectra, fluorescence lifetimes, and CIE diagrams revealed that as the concentration increases, the luminescence intensities of the three complex solutions first increase and then all exhibit concentration quenching. After concentration quenching, phenomena such as a decrease in fluorescence lifetime, luminous efficiency, color purity, and color temperature were observed. Through the study of solvent effects, the "antenna effect" of energy transfer between ligands and rare earth ions in the solution can be discovered, thus determining the optimal luminescence concentrations of these luminescent matrix materials. Rare earth europium complexes Light absorption Fluorescence properties Concentration quenching Full Text Additional Declarations No competing interests reported. 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. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-7626845","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":530120979,"identity":"2095cad6-c8be-47f4-b375-d639eefdc1d9","order_by":0,"name":"Rui Liang","email":"","orcid":"","institution":"Inner Mongolia Normal University","correspondingAuthor":false,"prefix":"","firstName":"Rui","middleName":"","lastName":"Liang","suffix":""},{"id":530120980,"identity":"1ed943ba-7eb2-4747-961b-c0ffd41d2778","order_by":1,"name":"Gerile 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Complexes","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Rare earth europium complexes, Light absorption, Fluorescence properties, Concentration quenching","lastPublishedDoi":"10.21203/rs.3.rs-7626845/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7626845/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eConcentration quenching is mainly caused by energy transfer and cross relaxation between luminescent centers. As the concentration of luminescent centers increases, the distance between them decreases, making it easier for energy to be transferred or consumed, resulting in a reduction in luminescence intensity. In this paper, to reveal the influence of solvent effects on the luminescence properties of rare earth complexes, firstly, low-toxicity rare earth amino acid complex luminescent matrix materials such as europium octanoyl alaninate Eu(oct-ala)\u003csub\u003e3\u003c/sub\u003e, europium octanoyl phenylalaninate Eu(oct-phe)\u003csub\u003e3\u003c/sub\u003e, and europium octanoyl serine Eu(oct-ser)\u003csub\u003e3\u003c/sub\u003e were prepared through in-solution chemical reactions. Subsequently, ethanol solutions of rare earth complexes with different concentrations were prepared, and their photophysical properties such as infrared absorption spectra, ultraviolet-visible absorption spectra, and fluorescence spectra were tested. The study found that as the concentration increases, a red shift occurs in the ultraviolet-visible absorption peaks of the rare earth complex solutions. In addition, further research on fluorescence spectra, fluorescence lifetimes, and CIE diagrams revealed that as the concentration increases, the luminescence intensities of the three complex solutions first increase and then all exhibit concentration quenching. After concentration quenching, phenomena such as a decrease in fluorescence lifetime, luminous efficiency, color purity, and color temperature were observed. Through the study of solvent effects, the \"antenna effect\" of energy transfer between ligands and rare earth ions in the solution can be discovered, thus determining the optimal luminescence concentrations of these luminescent matrix materials.\u003c/p\u003e","manuscriptTitle":"Influence of Solvent Effects on the Photophysical Properties of Europium Amino Acid Complexes","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-10-16 03:31:21","doi":"10.21203/rs.3.rs-7626845/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"4e90aaae-5eb4-4ba9-9243-53feb588dab7","owner":[],"postedDate":"October 16th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2025-11-10T12:38:21+00:00","versionOfRecord":[],"versionCreatedAt":"2025-10-16 03:31:21","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7626845","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7626845","identity":"rs-7626845","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}