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TEM images of (A) LiYF4:10%Er3+, (B) NaYF4:10%Er3+, (C) NaGdF4:10%Er3+, (D) LiYF4:10%Er3+@LiYF4, (E) NaYF4:10%Er3+@NaYF4, (F) NaGdF4:10%Er3+@NaGdF4 nanoparticles; and XRD pattern of (G) LiYF4:10%Er3+@LiYF4, (H) NaYF4:10%Er3+@NaYF4, (I) NaGdF4:10%Er3+@NaGdF4 nanoparticles.
