A novel strategy is proposed based on the efficient energy transfer from Tb to Pr for the sensitive and selective discrimination of praseodymium ions due to the matched energy levels of D (Tb) and P (Pr). The electron of Tb transfers from the ground state to the excited state under the excitation of ultraviolet light and relaxes to the D level. In the presence of Prthe electron has no time to return to the ground state, thus it transfers to the P level of Prresulting in the quenching of Tb luminescence. In the case of GdPO: Tb nanowire, its fluorescence intensity at 545 nm linearly decreased when Pr concentration ranged from 1 × 10 to 1 × 10 M, and the detection limit was 75 nM. To further investigate the sensing mechanism, CePO: Tb, YPO: Tb, and YBO: Tb nanoparticles were also synthesized for Pr ion detection. For all materials, similar fluorescence quenching by Pr ions occurred, which confirmed the efficient energy transfer from Tb to Pr ions. Utilizing the matched energy levels of D (Tb) and P (Pr), for the first time, we proposed a novel strategy (taking GdPO: Tb probe as the example) based on the efficient energy transfer from Tb to Pr for the sensitive and selective discrimination of praseodymium ions.
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