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Issue 34, 2013
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pH- and surfactant-mediated tunable morphology and upconversion of rare-earth doped fluoride microcrystals

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Abstract

A novel and facile citrate-assisted hydrothermal approach has been developed for the shape-selective synthesis of fluoride microcrystals, including NaYF4 and YF3, by tuning the pH of the mother liquid. A series of controlled experiments demonstrate that three important factors, including the pH values of the mother solution and the amount of trisodium citrate in conjunction with the intrinsic character of rare-earth ions, are responsible for varied distinctive morphologies such as the truncated octahedrons, prismatic microtubes with unusual zigzag top ends, prismatic short rods with regular hexagonal concave centers, and thin plates. The possible formation mechanisms for products with various morphologies have been explored, and the mechanism based on selective adsorption and the cation exchange are proposed. The upconversion spectra of Yb/Er-doped fluoride samples with different shapes have been investigated. The shape effect on luminescence is attributed to the different crystal facet components of an anisotropic orientational microcrystal in which the crystal planes composed of the a-axis and c-axis have the difference in ion-space distance and crystallization quality.

Graphical abstract: pH- and surfactant-mediated tunable morphology and upconversion of rare-earth doped fluoride microcrystals

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Publication details

The article was received on 30 Jan 2013, accepted on 11 Jun 2013 and first published on 13 Jun 2013


Article type: Paper
DOI: 10.1039/C3RA40517F
Citation: RSC Adv., 2013,3, 14757-14765
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    pH- and surfactant-mediated tunable morphology and upconversion of rare-earth doped fluoride microcrystals

    D. Gao, W. Gao, P. Shi and L. Li, RSC Adv., 2013, 3, 14757
    DOI: 10.1039/C3RA40517F

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