Ultrafine Gd2O3:Eu3+nanocrystals were successfully prepared by a simple reverse microemulsion method and subsequent calcination. Their structural, optical and magnetic properties were investigated using scanning electron microscopy (SEM), transmis-sion electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), photoluminescence (PL), and magnetic property measurement system (MPMS). The amorphous Gd2(CO3)3:Eu3+colloidal spheres were proved as an intermediate product, and gradually transformed into crystallized Gd2O3:Eu3+with average diameter less than 100 nm. The paramagnetic property of the synthesized Gd2O3:Eu3+nanocrystals were confirmed with its linear hysteresis plot (M-H). And Gd2O3:Eu3+nanocrystals showed high contrast T1-enhancing modality due to the presence of the Gd3+ ions onto the particle surface. In addition, the application of the Gd2O3:Eu3+nanocrystals as biotag for cell labeling was reported, red fluorescence from Eu3+ions observed by fluorescence micros-copy showed that the nanocrystals could permeate the cell membrane. Cytotoxicity studies of the Gd2O3:Eu3+nanocrystals showed no adverse effect on cell viability, evidencing their high biological compatibility. Therefore, the nanoprobe formed from Gd2O3:Eu3+nanocrystals provided the dual modality of optical and magnetic resonance imaging.
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