Abstract
Hexagonal phase LaF 3: Tb 3+ nano/microcrystals were successfully synthesized via ultrasonic-assisted ionic liquid (IL) method. The field emission scanning electron microscope (FESEM) images revealed that the morphologies of the as-prepared LaF 3: Tb 3+ samples were gradually converted from nanoplates to microcylinders with increasing the concentration of Tb 3+ ions. The photoluminescent (PL) spectrum shows that all the as-prepared La 1-x Tb x F 3 samples show the characteristic emissions of Tb 3+5 D 4 → 7 F J (J = 6-3, with 5 D 4 → 7 F 5 green emission at 542 nm as the strongest one) transitions. The optimal Tb 3+-doped concentration is 20 mol.% in the LaF 3 host. The photoluminescence intensity of the La 0.80 Tb 0.20 F 3 microcylinders prepared by ultrasonic irradiation was largely improved as compared with that of the product prepared by stirring.
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