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• 作者：Jiao WangBi-Qiu Liu ; Gaoshan Huang ; Zhi-Jun Zhang ; Jing-Tai Zhao
• 刊名：Crystal Growth & Design
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：17
• 期：2
• 页码：711-718
• 全文大小：679K
• ISSN：1528-7505

文摘

This work reports self-assembled uniform monodisperse Na_xY(OH)_yF_3+x–y (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 Na_xY(OH)_yF_3+x–y (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) Na_xY(OH)_yF_3+x–y (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.