Combination of Ionic Liquid and Sonication: a Fast, Mild and Green Way to Fabricate Europium–doped Lanthanide Nanophosphates

摘要

We introduced the synthesis of Eu~(3+)-doped lanthanide nano- phosphrates througha fast, green and facile sonication-accel- erated ionic liquid (IL)-based reaction system. LnPO4:Eu~(3+)(Ln= La, Gd, Y,and Lu)nanostructures were prepared from aqueous solution of Ln(NO3)3·6H2O and IL-1-Hexyl-3-methyl- imidazoliumdihydric phosphate ([HMIM]H2PO4)under ultra- sound irradiation without further use of organic solvents, sur- factants or templates.The nanocrystals were obtained at 60 o C for0.5–1 h without high temperatureannealing.X-ray powder diffraction, scanning electron microscopy, transmission electro- nmicroscopy and photoluminescence spectra were used to characterize the nanostructures.The results displayed that nanowires, nanorods, nanowirebundles and nanoparticles were obtained for LnPO4:Eu~(3+)(Ln= La, Gd,Yand Lu), respectively. The growth process of the nanostructureswas investigated based on a series of SEM studies of the products obtained at different sonication durations. [HMIM]H2PO4 acted as reaction medium, reactant as well as morphology-directing agent in the for- mation of the nanocrystals. Both sonication and [HMIM]H2PO4 were two key factorsfor the fabrication of the well-distributed nanoarchitectures. Photoluminescence properties of Eu~(3+)-dop- ed LnPO4 were also studied.