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Homogeneous core-shell nanocrystals (NCs) with highly tunable and uniform thickness shells were synthesized with a one-step, seed-mediated process. It was determined that the quantity of ligand oleic acid (OA) directly affects the uniformity of shell precursor epitaxial growth on core NCs. The optimum quantity of ligand OA was experimentally determined. Based on this finding, NaYF4:Yb, Tm/NaYF4 core-shell...
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