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Issue 27, 2013
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Influence of surfactants on the morphology, upconversion emission, and magnetic properties of β-NaGdF4:Yb3+,Ln3+ (Ln = Er, Tm, Ho)

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Abstract

In this article, rare earth (RE) ion doped β-NaGdF4 crystals with multicolor up-conversion (UC) emissions and paramagnetic properties were synthesized via a simple one-step precipitation method at room-temperature for the first time. Different surfactants, including Na2EDTA, PVP, SDS, and Na2tar, were introduced to control the crystal size and morphology. It was found that the organic additive can strongly control the size and structure of as-prepared β-NaGdF4:Yb3+,Ln3+ samples through absorbing on the surface of primary particles and/or coordinating with RE3+ ions. Most interestingly, the UC and magnetic properties of the NaGdF4 crystals were also greatly influenced by those additives, which exhibit great distinction. The red emission of 4F9/24I15/2 (655 nm) in β-NaGdF4:20%Yb3+,2%Er3+, 5F55I8 (648 nm) in β-NaGdF4:20%Yb3+,2%Ho3+, and NIR emission of 3H43H6 (797 nm) in β-NaGdF4:20%Yb3+,2%Tm3+ were all markedly enhanced due to abundant organic groups that affect the nonradiative processes. The magnetic properties of β-NaGdF4:Yb3+,Er3+ crystals prepared with different surfactants exhibit typical paramagnetic behavior with different intensities due to the different crystal shape anisotropy.

Graphical abstract: Influence of surfactants on the morphology, upconversion emission, and magnetic properties of β-NaGdF4:Yb3+,Ln3+ (Ln = Er, Tm, Ho)

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Publication details

The article was received on 04 Jan 2013, accepted on 23 Apr 2013 and first published on 23 Apr 2013


Article type: Paper
DOI: 10.1039/C3DT00029J
Citation: Dalton Trans., 2013,42, 10019-10028
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    Influence of surfactants on the morphology, upconversion emission, and magnetic properties of β-NaGdF4:Yb3+,Ln3+ (Ln = Er, Tm, Ho)

    F. He, N. Niu, L. Wang, J. Xu, Y. Wang, G. Yang, S. Gai and P. Yang, Dalton Trans., 2013, 42, 10019
    DOI: 10.1039/C3DT00029J

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