Titanium dioxide (TiO2) nanoparticles (NPs) are widely used in industry and commercial products. Thus, their potential risks to the environment human health must be evaluated. Doping NPs with certain ions makes it possible mix properties or generate new ones. order track TiO2 biological assays, doping europium (Eu3+) was performed, which luminesce red. Here, we synthesized Eu3+-doped nanocrysta...