| Summary: | A europium(III) hybrid material Eu(tta)<sub>3</sub>bpdc-SiO<sub>2</sub>@mTiO<sub>2</sub> (Htta = 2-thenoyltrifluoroacetone, H<sub>2</sub>bpdc = 2,2′-bipyridine-3,3′-dicarboxylic acid) was successfully designed and synthesized by the covalent grafting complex Eu(tta)<sub>3</sub>bpdc to SiO<sub>2</sub>@mTiO<sub>2</sub> core–shell nanosphere. The FT-IR, PXRD, XPS, TEM, HRTEM, SAED, TGA and PL were performed to characterize these materials. The results indicate that core–shell nanosphere structure and anatase crystallites of SiO<sub>2</sub>@mTiO<sub>2</sub> are retained well after grafting the europium complex. Hybrid material Eu(tta)<sub>3</sub>bpdc-SiO<sub>2</sub>@mTiO<sub>2</sub> displays uniform nanosphere structure, bright red color and long lifetime, which can serve as a multicolor emission material modulated by using Al<sup>3+</sup> ions via the cation exchange approach under a single-wavelength excitation. To the best of our knowledge, this work is the first multicolor emissive sensor for Al<sup>3+</sup> ions based on the lanthanide hybrid material.
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