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Monodisperse NaxY(OH)yF3+xy Mesocrystals with Tunable Morphology and Chemical Composition: pH-Mediated Ion-Exchange

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journal contribution
posted on 21.12.2016, 00:00 by Jiao Wang, Bi-Qiu Liu, Gaoshan Huang, Zhi-Jun Zhang, Jing-Tai Zhao
This work reports self-assembled uniform monodisperse NaxY­(OH)yF3+xy (0 < x < 1, 0 < y < 3) mesocrystals with tunable morphology and chemical composition obtained from a hydrothermal ion-exchange reaction. Detailed crystal structure analysis illustrates that the special crystal structure of NaxY­(OH)yF3+xy (0 < x < 1, 0 < y < 3) facilitates the pH-mediated ion-exchange process. A possible topochemical-based mechanism has been proposed to this ion-exchange process. By carefully adjusting the pH value of the solution, the tunable three-dimensional (3D) NaxY­(OH)yF3+xy (0 < x < 1, 0 < y < 3) mesocrystal architectures are obtained through an oriented self-assembly. The photoluminescence properties of the rare earth ions (such as Eu3+, Tb3+, and Ce3+) doped as-prepared mesocrystal samples are investigated, and multicolor emissions are realized.