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(a) X-ray excited luminescence spectra of the nanoparticles with varied nanostructures. (b) Camera counts of the NaGdF4@NaGdF4:15Tb, NaGdF4:15Tb@NaYF4 and NaGdF4@NaGdF4:15Tb@NaYF4 water suspensions as a function of the Tb concentration in solution. (c) X-ray excited optical phantom imaging of the aqueous solution of NaGdF4@NaGdF4:15Tb, NaGdF4:15Tb@NaYF4 and NaGdF4@NaGdF4:15Tb@NaYF4 nanoparticles.
