NaYF<sub>4</sub>:Yb,Er/NaYF<sub>4</sub> Core/Shell Nanocrystals with High Upconversion Luminescence Quantum Yield

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  • Christian Homann
    Institut für Chemie Neuer Materialien Fachbereich Biologie/Chemie Universität Osnabrück Barbarastrasse 7 49076 Osnabrück Germany
  • Lisa Krukewitt
    Federal Institute for Materials Research and Testing (BAM) Division Biophotonics Richard-Willstaetter-Strasse 11 12489 Berlin Germany
  • Florian Frenzel
    Federal Institute for Materials Research and Testing (BAM) Division Biophotonics Richard-Willstaetter-Strasse 11 12489 Berlin Germany
  • Bettina Grauel
    Federal Institute for Materials Research and Testing (BAM) Division Biophotonics Richard-Willstaetter-Strasse 11 12489 Berlin Germany
  • Christian Würth
    Federal Institute for Materials Research and Testing (BAM) Division Biophotonics Richard-Willstaetter-Strasse 11 12489 Berlin Germany
  • Ute Resch‐Genger
    Federal Institute for Materials Research and Testing (BAM) Division Biophotonics Richard-Willstaetter-Strasse 11 12489 Berlin Germany
  • Markus Haase
    Institut für Chemie Neuer Materialien Fachbereich Biologie/Chemie Universität Osnabrück Barbarastrasse 7 49076 Osnabrück Germany

書誌事項

公開日
2018-06-14
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/anie.201803083
公開者
Wiley

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説明

<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>

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