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Issue 36, 2013
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The synthesis, crystal structure and multicolour up-conversion fluorescence of Yb3+/Ln3+ (Ln = Ho, Er, Tm) codoped orthorhombic lutetium oxyfluorides

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Abstract

For the first time, undoped and Yb3+/Ln3+ (Ln = Ho, Er, Tm) codoped orthorhombic lutetium oxyfluorides have been fabricated via a facile stepwise route involving room temperature co-precipitation and a subsequent thermal decomposition procedure. The phase formation, crystal structure, particle morphologies and up-conversion (UC) luminescence were investigated by means of powder X-ray diffraction, TEM, IR, thermal and luminescence spectroscopy. It has been found that the intermediate Lu(CO3)1−x(OH)yF1+2xy precursor plays an essential role in the formation of the final metastable LunOn−1Fn+2 Vernier phase. Multicolour up-conversion has been achieved in the Yb3+/Tm3+, Yb3+/Ho3+ and Yb3+/Er3+ codoped samples under near-infrared excitation (λ = 980 nm) and, notably, the Yb3+/Er3+ codoping yields an almost single-band red emission at about 660 nm. A short Ln3+–Ln3+ distance combined with the multiple doping sites in the low symmetry (C1 and Cs) host lattice are considered responsible for the effective energy transfer and, therefore, the intense up-conversion emission. The present work, together with previous studies on the UC performance of Vernier phase yttrium oxyfluorides, illustrates that the Vernier phase oxyfluorides are promising up-conversion host materials for lanthanide ions in a variety of applications such as bioprobes and chromatic displays.

Graphical abstract: The synthesis, crystal structure and multicolour up-conversion fluorescence of Yb3+/Ln3+ (Ln = Ho, Er, Tm) codoped orthorhombic lutetium oxyfluorides

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Publication details

The article was received on 29 May 2013, accepted on 08 Jul 2013 and first published on 09 Jul 2013


Article type: Paper
DOI: 10.1039/C3TC31016G
Citation: J. Mater. Chem. C, 2013,1, 5711-5717
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    The synthesis, crystal structure and multicolour up-conversion fluorescence of Yb3+/Ln3+ (Ln = Ho, Er, Tm) codoped orthorhombic lutetium oxyfluorides

    W. Luo, Y. Wang, Y. Chen, T. Wen, M. Liu, Y. Wang, F. Liao and J. Lin, J. Mater. Chem. C, 2013, 1, 5711
    DOI: 10.1039/C3TC31016G

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