Crystal Phase Control of NaGdF4:Eu3+ Nanocrystals: Influence of the Fluoride Concentration and Molar Ratio between NaF and GdF3

Autor(en): Ptacek, Pavel
Schaefer, Helmut
Zerzouf, Otmane
Koempe, Karsten
Haase, Markus 
Stichwörter: Chemistry; Chemistry, Multidisciplinary; CONVERSION; Crystallography; EMISSION; HEXAGONAL-PHASE; Materials Science; Materials Science, Multidisciplinary; NANOPARTICLES; NAYF4 NANOCRYSTALS; NAYF4-YB,ER; RARE-EARTH FLUORIDE; SIZE; SPECTROSCOPY; YB3+
Erscheinungsdatum: 2010
Herausgeber: AMER CHEMICAL SOC
Journal: CRYSTAL GROWTH & DESIGN
Volumen: 10
Ausgabe: 5
Startseite: 2434
Seitenende: 2438
Zusammenfassung: 
Sodium gadolinium fluoride nanocrystals have been prepared in the solvent N-(2-hydroxyethyl-ethylenediamine (HEEDA) at 200 degrees C. The formation of the cubic and the hexagonal phase in the synthesis can be controlled by properly adjusting the concentration of fluoride and the ratio between sodium and gadolinium. The absence of the Eu3+-O2- charge transfer band in the excitation spectrum of Eu3+-doped nanocrystals indicates that the concentration of oxygen ions is low in all samples.
ISSN: 15287483
DOI: 10.1021/cg100282w

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