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Dicarboxylate mediated efficient morphology/phase tailoring of YPO4:Ln3+ crystals and investigation of down-/up-conversion luminescence

Abstract

The dicarboxylate anions of tartrate (C4H4O62-, Tar2-), malate (C4H4O52-, Mal2-), and succinate (C4H4O42-, Suc2-) were originally used as morphology/structure modifiers in the hydrothermal crystallization of YPO4, and both hexagonal (h-) and tetragonal (t-) structured crystals with multiform morphologies of high uniformity were selectively synthesized. The materials were characterized by the combined techniques of XRD, FE-SEM, TEM, FT-IR, TG, and optical spectroscopy, and the mechanisms of phase/morphology evolution were expatiated. It was clearly shown that Tar2- may induce an inverse phase transformation of YPO4 from the thermodynamically stable tetragonal structure (nanoparticles) to the metastable hexagonal structure (microprisms), and a series of controlled experiments exhibited that the performance of Tar2- was strongly affected by the experimental parameters of Tar2-/PO43-/Y3+ molar ratio, solution pH, hydrothermal temperature, and reaction time. In comparison with Tar2-, Mal2- induced the direct crystallization of h-YPO4 microprismatic crystals while Suc2- restricted the 1-D growth of t-YPO4 nanocrystal. For the samples calcined at 700 oC, the down-conversion photoluminescence of Eu3+ in h-YPO4 and t-YPO4 and the up-conversion luminescence of (Yb/Er)3+ couple in t-YPO4 were also comparatively studied and elucidated in detail.

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Publication details

The article was received on 06 Jul 2017, accepted on 03 Aug 2017 and first published on 03 Aug 2017


Article type: Paper
DOI: 10.1039/C7CE01248A
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Dicarboxylate mediated efficient morphology/phase tailoring of YPO4:Ln3+ crystals and investigation of down-/up-conversion luminescence

    Z. Wang, J. Li, Q. Zhu, B. Kim and X. Sun, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01248A

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