Synthesis and Optical Properties of KYF4/Yb, Er Nanocrystals, and their Surface Modification with Undoped KYF4

Autor(en): Schaefer, Helmut
Ptacek, Pavel
Zerzouf, Otmane
Haase, Markus 
Stichwörter: Chemistry; Chemistry, Multidisciplinary; Chemistry, Physical; DEPENDENCE; EMISSION; FLUORESCENCE; FLUORITE STRUCTURE; HEXAGONAL-PHASE; LANTHANIDE; LASER; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Physics, Condensed Matter; Science & Technology - Other Topics; SPECTROSCOPY; UP-CONVERSION LUMINESCENCE; YB-KYF4
Erscheinungsdatum: 2008
Herausgeber: WILEY-V C H VERLAG GMBH
Journal: ADVANCED FUNCTIONAL MATERIALS
Volumen: 18
Ausgabe: 19
Startseite: 2913
Seitenende: 2918
Zusammenfassung: 
KYF4/Yb3+, Er3+ nanocrystals with a mean diameter of approximately 13 nm were synthesized at 200 degrees C in the high boiling organic solvent N-(2-hydroxyethyl)ethylenediamine (HEEDA). The particles crystallize in the cubic phase known from alpha-NaYF4 and form transparent colloidal solutions in tetraethylene glycol (TEG) or propanol. Solutions containing I wt % of the nanocrystals in TEG display visible upconversion emission upon continuous wave (CW) excitation at 978 nm. Growing undoped KYF4 on the surface of the KYF4/Yb3+, Er3+ nanocrystals increases the upconversion efficiency by more than a factor of 20. The XRD data of these particles, display a slight increase in the mean particle size from 13 to 15.5 nm, indicating that only a part of the subsequently added KYF4 shell material is deposited onto the particle surface. Nevertheless the performed surface modification obviously leads to core/shell structured particles.
ISSN: 1616301X
DOI: 10.1002/adfm.200800368

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