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We propose an efficient bioimaging strategy using Yb3+,Er3+,Eu3+-triplet doped YVO4 nanoparticles which were synthesized with polymer as a template. The obtained particles possess nanoscale, uniform, and flexible excitation. The effect of Eu3+ ions on the luminescence properties of YVO4:Yb3+,Er3+,Eu3+ was investigated. The upconversion mechanism of the prepared material was also discussed. The structure...