Crystal phase control of luminescing NaGdF4 : Eu3+ nanocrystals

Autor(en): Ptacek, Pavel
Schaefer, Helmut
Koempe, Karsten
Haase, Markus 
Stichwörter: CHARGE-TRANSFER; Chemistry; Chemistry, Multidisciplinary; Chemistry, Physical; EMISSION; EU3+ CENTERS; FLUORIDE; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; Physics; Physics, Applied; Physics, Condensed Matter; Science & Technology - Other Topics; SIZE
Erscheinungsdatum: 2007
Herausgeber: WILEY-V C H VERLAG GMBH
Journal: ADVANCED FUNCTIONAL MATERIALS
Volumen: 17
Ausgabe: 18
Startseite: 3843
Seitenende: 3848
Zusammenfassung: 
NaGdF4:Eu3+, NaEuF4, and NaGdF4 nanocrystals were synthesized in the high-boiling coordinating solvent N-(2-hydroxyethyl)-ethylenediamine (HEEDA). Phase pure nanomaterials, crystallizing either in the cubic a-phase or the hexagonal P-phase, were obtained by adjusting one reaction parameter only, i.e., the molar ratio between metal and fluoride ions in the synthesis. The hexagonal P-phase is formed, if this molar ratio is close to stoichiometric, whereas the cubic a-phase is obtained in the presence of excess metal ions. The optical properties of the Eu3+ doped samples are different for the two crystal phases. The results indicate an increased number of oxygen impurities close to Eu3+ ions, if excess metal ions are used in the synthesis.
ISSN: 1616301X
DOI: 10.1002/adfm.200600974

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