Abstract
Self-assembled 3D flower-like TiO2:Eu3+ microspheres have been synthesized by a simple hydrothermal method and crystallized by subsequent heat treatments at elevated temperatures. The as-prepared samples are loose and porous with flower-like structure, and the subunits are irregularly shaped nanosheets. A possible growth mechanism is proposed for the 3D flower-like TiO2:Eu3+ microspheres, and it was found that the synergistic effect of citric acid (H3Cit), ethanediamine (En) and hydrofluoric acid (HF) is of crucial importance for the controllable fabrication of TiO2:Eu3+ flower-like hierarchical structures. Furthermore, the calcined flower-like TiO2:Eu3+ hierarchical microspheres exhibit excellent red emission corresponding to the 5D0–7F2 transition of the Eu3+ ions under UV light excitation.
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