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. 2013 Feb 27;3(3):210–222. doi: 10.7150/thno.5298

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(A) and (B) TEM images with different magnifications of water-soluble hexagonal phase NaYbF₄: 25%Gd, 2%Tm nanocrystals. (C) The corresponding HR-TEM image. (D) The SAED pattern.