Abstract
Single-crystalline mesoporous NaTbF4 nano-rice have been successfully synthesized in large scale by reaction of aqueous Tb3+ with sodium fluoride in the presence of ethylenediaminetetraacetic acid (EDTA) at 110 °C for 12 h, which were confirmed by X-ray powder diffraction, energy dispersive X-ray analysis, transmission electron microscopy, scanning electron microscopy, and nitrogen adsorption–desorption isotherms. A mechanism for the formation of the mesoporous nano-rice by an EDTA-directed assembly process accompanied by the localized Ostwald ripening has been proposed based on the observations of time-dependent experiments. In addition, this novel nano-rice can be used as an excellent host lattice for Eu3+ ions, in which the luminescence properties of Eu3+ would be improved significantly. Our study indicates that the maximum quantum efficiency of NaTbF4:Eu nano-rice reaches up to 69.9%. This work demonstrates that morphology-controlled synthesis can offer a simple solution to fabricate mesoporous NaTbF4:Eu nano-rice for technological and biomedical applications.
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