Ostwald-ripening and particle size focussing of sub-10 nm NaYF₄ upconversion nanocrystals.


We have studied the growth behaviour of sub-10 nm NaYF₄ upconversion nanocrystals of the hexagonal β-phase and the cubic α-phase. Ostwald-ripening of such particles in oleic acid/octadecene solvent results in broadening of the particle size distribution if the colloid contains particles of one crystal phase only. Narrow size distributions are formed only if… (More)
DOI: 10.1039/c4nr03833a


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