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Schematic Illustration of a) the growth process of α‐NaYF4:Yb,Er NCs via a delayed nucleation pathway, b) the growth process of β‐NaYF4:Yb,Er NCs from α‐NaYF4:Yb,Er monomers via a delayed α–β phase transition. Reproduced with permission.75 Copyright 2007, American Chemical Society. TEM images of the β‐NaYF4‐based UCNPs: c–e) NaYF4:Yb/Er, f–h) NaYF4:Yb/Tm, i) NaYF4:Yb/Ce/Ho, j, h) NaYF4:Yb/Ho. Reproduced with permission.76 Copyright 2010, National Academy of Sciences.
