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A novel nanocomposite synthesis method of amino-modified NaYF 4 :Yb,Er upconversion luminescent nanoparticles and single-walled carbon nanohorns was developed via covalent linkage for the first time. The nanocomposite was covalently coupled with rabbit anti-CEA8 antibody and then used successfully as a cell labeling agent for the immunolabeling and imaging of HeLa cells.