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. 2021 Mar 18;26(3):036004. doi: 10.1117/1.JBO.26.3.036004

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© 2021 The Authors

Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Fig. 2 — (a) Luminescence spectra of ${NaGdF}_{4} : Eu$ (red) and ${NaGdF}_{4} : Tb$ (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 zoomed-in view.