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• W2163741128 abstract "A comprehensive characterization of NaYF4 nanocrystals synthesized in trioctylphosphine oxide has been reported in order to present an effective method of monodisperse, small, hexagonal nanocrystal synthesis in a high boiling organic solvent via a co-thermolysis pathway. We observed the influence of temperature, Na/Y precursors ratio and time of the synthesis on the nanocrystals size, shape and crystal structure. For that purpose, we characterized the structure of as-synthesized nanocrystals by X-ray diffraction and transmission electron microscopy. Moreover, all nanocrystals were doped with Eu3+ ions, which were used as an optical crystal field probe. We applied photoluminescence, PL excitation and absorbance spectra to determine the influence of crystal symmetry, surface to volume ratio and ligands on the optical properties of doped Eu3+ ions. It was found that trioctylphosphine oxide reduces the free-energy barrier and stimulates the NaYF4 crystallization in the hexagonal phase, even at relatively low temperature. A similar effect was observed when the excess of sodium trifluoroacetate precursors was used. Moreover, the presented nanocrystal evolution within synthesis time confirmed that at suitable conditions NaYF4 crystallized in the hexagonal phase within less than 5 min. Optical spectroscopy investigations confirmed the high quality of small β-NaYF4:Eu3+ nanocrystals, which are promising candidates for e.g. optical markers in the visible wavelength range." @default.
• W2163741128 created "2016-06-24" @default.
• W2163741128 creator A5014610672 @default.
• W2163741128 creator A5060966771 @default.
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• W2163741128 date "2013-01-01" @default.
• W2163741128 modified "2023-10-16" @default.
• W2163741128 title "NaYF4 nanocrystals with TOPO ligands: synthesis-dependent structural and luminescent properties" @default.
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• W2163741128 doi "https://doi.org/10.1039/c3cp52865k" @default.
• W2163741128 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24108220" @default.
• W2163741128 hasPublicationYear "2013" @default.
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