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Issue 13, 2018
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Self-assembled hierarchical architecture of tetragonal AgLa(MoO4)2 crystals: hydrothermal synthesis, morphology evolution and luminescence properties

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Abstract

Tetragonal AgLa(MoO4)2 microcrystals with novel discal hierarchical architectures were successfully synthesized via a one-step hydrothermal route. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and photoluminescence (PL) spectral analysis as well as decay lifetimes were employed to characterize the prepared products. It was found that various hierarchical architectures were obtained by altering the amount of MoO42−, pH values and surfactants, respectively. In particular, the pH value had a large influence not only on the morphology, but also on the size and crystallinity. The formation mechanism of discal hierarchical architectures was proposed on the basis of the self-assembly growth of nanosheets. The AgLa(MoO4)2 microcrystals exhibited excellent down/up-conversion (DC/UC) multicolor emissions after doping different Ln3+ ions. For DC luminescence, AgLa(MoO4)2:Ln3+ (Ln = Eu, Tb, Sm, Dy) exhibited characteristic red emission, green emission, orange emission and yellow emission, respectively. The energy transfer of MoO42− → Ln3+ (Ln = Tb, Sm, Dy) markedly enhanced the characteristic emissions of Tb3+, Sm3+ and Dy3+. For UC luminescence, AgLa(MoO4)2:Yb3+/Ln3+ (Ln = Er, Tm, Ho) exhibited intense green (2H11/24I5/2 of Er3+), blue (1G43H6 of Tm3+), yellow (5F55I8 of Ho3+) emissions, respectively. Therefore, the as-prepared AgLa(MoO4)2:Ln3+ microcrystals may have potential application to serve as fluorescent lamps, field emission display devices, sensors and biological imaging agents.

Graphical abstract: Self-assembled hierarchical architecture of tetragonal AgLa(MoO4)2 crystals: hydrothermal synthesis, morphology evolution and luminescence properties

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Publication details

The article was received on 22 Dec 2017, accepted on 10 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7CE02209C
Citation: CrystEngComm, 2018,20, 1832-1843
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    Self-assembled hierarchical architecture of tetragonal AgLa(MoO4)2 crystals: hydrothermal synthesis, morphology evolution and luminescence properties

    W. Xia, Y. Zhang, S. Hu, J. Xiong, J. Tang and J. Yang, CrystEngComm, 2018, 20, 1832
    DOI: 10.1039/C7CE02209C

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