Effect of the crystal structure of small precursor particles on the growth of beta-NaREF4 (RE = Sm, Eu, Gd, Tb) nanocrystals

Autor(en): Voss, Benjamin
Nordmann, Joerg
Uhl, Andreas
Komban, Rajesh
Haase, Markus 
Stichwörter: CELLS; Chemistry; Chemistry, Multidisciplinary; LASER; LAYER; Materials Science; Materials Science, Multidisciplinary; Nanoscience & Nanotechnology; NAYF4 NANOCRYSTALS; NAYF4-YB,ER; PHASE; PHOSPHORS; Physics; Physics, Applied; Science & Technology - Other Topics; SIZE; STRATEGY; UP-CONVERSION NANOPARTICLES
Erscheinungsdatum: 2013
Volumen: 5
Ausgabe: 2
Startseite: 806
Seitenende: 812
The origin of the narrow particle size distributions obtained in the oleic acid-based synthesis of hexagonal phase beta-NaREF4 nanocrystals (RE = Sm, Eu, Gd, Tb) has been investigated. Compared to the standard synthesis, the growth conditions were simplified by using small purified particles of either alpha-NaREF4 (cubic phase) or beta-NaREF4 (hexagonal phase) as single-source precursors, thereby avoiding the complications arising from the simultaneous presence of molecular educts and intermediately formed small particles. The study shows that alpha-phase as well as beta-phase particles grow by Ostwald-ripening but narrow particle size distributions of the beta-NaREF4 product particles are only obtained when alpha-phase precursor particles are employed. Since the small particles are also formed as intermediate products in the standard synthesis of beta-NaSmF4, beta-NaEuF4, beta-NaGdF4 and beta-NaTbF4 particles, their crystal phase is an important parameter to obtain a narrow size distribution in these systems.
ISSN: 20403364
DOI: 10.1039/c2nr33083k

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