Extended Data Fig. 6: Characterization of core-shell structured α-NaLnF4@Na3CrF6 NPs.
From: High-brightness transition metal-sensitized lanthanide near-infrared luminescent nanoparticles
a-l, TEM images (left) and XRD patterns (right) of α-NaLnF4 (Ln = Y (a), Pr (b), Nd (c), Eu (d), Gd (e), Tb (f), Dy (g), Ho (h), Er (i), Tm (j), Yb (k), and Lu (l)) core before (top left) and after (bottom left) the Na3CrF6 shell coated. Scale bar: 50 nm.
