期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 2, 期 5, 页码 848-855出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc31880j
关键词
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资金
- National Natural Science Foundation of China [91122003]
- Developing Science Funds of Tongji University
Monoclinic AgRE(WO4)(2) (RE = Y, La, Gd, Lu) with novel self-assembled hierarchical architectures were fabricated via a facile and mild liquid route. The phase and morphology of these products are strongly dependent on the pH of the mixed dispersion. Polyvinylpyrrolidone (PVP) also has a crucial effect on the formation of the hierarchical ellipsoid-shaped structures. The possible formation mechanism was proposed based on the time-dependent experiments. These hierarchical ellipsoids possess a low filling factor and high internal porosity, thus are well suited for applications such as sensors, catalysts and optical devices. In addition, monoclinic AgRE(WO4)(2) (RE = La, Y, Gd, Lu) exhibit excellent multicolor up/down-conversion (UC/DC) luminescence after incorporating Ln(3+) (Ln = Eu, Tb, Sm, Dy, Yb/Er, Yb/Tm) cations. Notably, AgLa(WO4)(2):Eu3+ (2 mol%), AgGd(WO4)(2):Eu3+ (2 mol%) and AgY(WO4)(2):Sm3+ (2 mol%) radiate white emission under UV excitation. The quantum yields of AgY(WO4)(2):Tb3+ (95%), AgY(WO4)(2):Dy3+(56%) and AgLa(WO4)(2):Eu3+ (40%) are rather high.
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