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(a) Luminescence spectra of NaGdF4:Eu (red) and NaGdF4:Tb (green) nanophosphors, TEM images above the spectra show silica coated particles. (b) TEM image of biotin coated nanophosphors (top), and STEM image of biotin coated nanophosphors adhered to streptavidin coated microspheres (bottom), inset image is a closer view.
