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Issue 13, 2013
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Enhanced deep-ultraviolet upconversion emission of Gd3+ sensitized by Yb3+ and Ho3+ in β-NaLuF4 microcrystals under 980 nm excitation

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Abstract

The shortest ever recorded and enhanced 204.5 nm ultraviolet (UV) upconversion (UC) emission from 6G7/2 levels of Gd3+ ions was observed in NaLuF4:20%Yb3+,2%Ho3+,20%Gd3+ microcrystals (MCs) under 980 nm near infrared (NIR) excitation for the first time. The 6GJ levels of Gd3+ ions can be efficiently populated by the energy transfer (ET) processes of Yb → Ho → Gd and Yb → Gd. The effect of the pH value on the morphology of the MCs was explored and the UC mechanisms in the tri-doped NaLuF4 samples were analyzed in detail based on the emission spectra and the dependence of the luminescence intensity on the laser pumping power where a 6-photon UC process of the 204.5 nm emission is observed. The contrast spectra of UC luminescence suggest that β-NaLuF4 MCs are a better UC host material than the β-NaYF4 counterpart. Furthermore, this paper also provides an effective and facile approach to modulating the sizes of β-NaLuF4 MCs by manipulating the pH values of the initial reaction solutions and the doping of Gd3+ ions.

Graphical abstract: Enhanced deep-ultraviolet upconversion emission of Gd3+ sensitized by Yb3+ and Ho3+ in β-NaLuF4 microcrystals under 980 nm excitation

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Publication details

The article was received on 26 Dec 2012, accepted on 14 Feb 2013 and first published on 14 Feb 2013


Article type: Paper
DOI: 10.1039/C3TC00936J
J. Mater. Chem. C, 2013,1, 2485-2490

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    Enhanced deep-ultraviolet upconversion emission of Gd3+ sensitized by Yb3+ and Ho3+ in β-NaLuF4 microcrystals under 980 nm excitation

    L. Wang, M. Lan, Z. Liu, G. Qin, C. Wu, X. Wang, W. Qin, W. Huang and L. Huang, J. Mater. Chem. C, 2013, 1, 2485
    DOI: 10.1039/C3TC00936J

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