Abstract
We introduce an ionic liquid-based method for the synthesis of uniform lanthanide fluoride microcrystals with the assistance of a sonication-accelerated reaction system. It is a fast, simple and mild process to get uniform monodisperse spherical lanthanide fluoride microcrystals in large scale. Homogeneous precipitation in a biphasic system of ethanol solution of lanthanide nitrates and ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate [C4mim][PF6] led to the uniform LnF3 microcrystals. The method was applied to the preparation of pure LnF3 (Ln=La, Ce, Pr, Nd) and Eu3+-doped LaF3, Tb3+-doped CeF3. SEM images indicated highly uniform cotton-like spherical microcrystals were obtained. HRTEM image indicated that the microcrystals were aggregated by nanocrystals of 6–10nm due to agglomeration effect of the ionic liquid. The uniformity and dispersility of LaF3 decreased with the increasing of the molar ratio of [C4mim][PF6] to La(NO3)3·6H2O. Diameter of the microcrystal decreased from La to Nd. Photoluminescence properties of Eu3+-doped LaF3 and Tb3+-doped CeF3 were also studied.
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