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We report a facile and effective luminescence method for the determination of the WO 4  2- ion in aqueous medium at initial pH = 6.3. This is achieved using 3,5-dihydroxybenzoic acid-capped CaF 2 :Tb 3+ (5%) nanocrystals (NCs) as a luminescent probe. This is accomplished based on the energy transfer luminescence from the WO 4  2- ion to the Tb 3+ ion in small-size CaF 2 :Tb 3+ NCs. Hydroxyl groups on the surface ligand helps in binding the tungstate ion to the surface of the NCs. With the gradual addition of the WO 4  2- ion, the intensity of the Tb 3+ excitation and emission spectra significantly increased. The linear range of the detection was from 1 to 10 μM for the WO 4  2- ion ( R  2 = 0.99). The calculated detection limit was 0.4 μM (by applying the 3σ/K criterion).

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3,5-Dihydroxy Benzoic Acid-Capped CaF2:Tb3+ Nanocrystals as Luminescent Probes for the WO42– Ion in Aqueous Solution