{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1362544420172890240.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1002/anie.201803083"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fanie.201803083"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/anie.201803083"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.201803083"}}],"dc:title":[{"@value":"NaYF<sub>4</sub>:Yb,Er/NaYF<sub>4</sub> Core/Shell Nanocrystals with High Upconversion Luminescence Quantum Yield"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Upconversion core/shell nanocrystals with different mean sizes ranging from 15 to 45 nm were prepared via a modified synthesis procedure based on anhydrous rare‐earth acetates. All particles consist of a core of NaYF<jats:sub>4</jats:sub>:Yb,Er, doped with 18 % Yb<jats:sup>3+</jats:sup> and 2 % Er<jats:sup>3+</jats:sup>, and an inert shell of NaYF<jats:sub>4</jats:sub>, with the shell thickness being equal to the radius of the core particle. Absolute measurements of the photoluminescence quantum yield at a series of different excitation power densities show that the quantum yield of 45 nm core/shell particles is already very close to the quantum yield of microcrystalline upconversion phosphor powder. Smaller core/shell particles prepared by the same method show only a moderate decrease in quantum yield. The quantum yield of 15 nm core/shell particles, for instance, is reduced by a factor of three compared to the bulk upconversion phosphor at high power densities (100 W cm<jats:sup>−2</jats:sup>) and by approximately a factor of 10 at low power densities (1 W cm<jats:sup>−2</jats:sup>).</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382544420172890243","@type":"Researcher","foaf:name":[{"@value":"Christian Homann"}],"jpcoar:affiliationName":[{"@value":"Institut für Chemie Neuer Materialien Fachbereich Biologie/Chemie Universität Osnabrück  Barbarastrasse 7 49076 Osnabrück Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544420172890240","@type":"Researcher","foaf:name":[{"@value":"Lisa Krukewitt"}],"jpcoar:affiliationName":[{"@value":"Federal Institute for Materials Research and Testing (BAM) Division Biophotonics  Richard-Willstaetter-Strasse 11 12489 Berlin Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544420172890241","@type":"Researcher","foaf:name":[{"@value":"Florian Frenzel"}],"jpcoar:affiliationName":[{"@value":"Federal Institute for Materials Research and Testing (BAM) Division Biophotonics  Richard-Willstaetter-Strasse 11 12489 Berlin Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544420172890242","@type":"Researcher","foaf:name":[{"@value":"Bettina Grauel"}],"jpcoar:affiliationName":[{"@value":"Federal Institute for Materials Research and Testing (BAM) Division Biophotonics  Richard-Willstaetter-Strasse 11 12489 Berlin Germany"}]},{"@id":"https://cir.nii.ac.jp/crid/1382544420172890244","@type":"Researcher","foaf:name":[{"@value":"Christian Würth"}],"jpcoar:affiliationName":[{"@value":"Federal Institute for Materials Research and Testing (BAM) Division Biophotonics  Richard-Willstaetter-Strasse 11 12489 Berlin 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Edition"}],"dc:publisher":[{"@value":"Wiley"}],"prism:publicationDate":"2018-06-14","prism:volume":"57","prism:number":"28","prism:startingPage":"8765","prism:endingPage":"8769"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fanie.201803083"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/anie.201803083"},{"@id":"https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.201803083"}],"createdAt":"2018-05-07","modifiedAt":"2023-09-02","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360284924859892352","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The effect of surroundings on the nonradiative relaxation coefficient of Yb<sup>3+</sup> and Er<sup>3+</sup> ions"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567184213579904","@type":"Article","resourceType":"学術雑誌論文(journal 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