Enhanced deep-ultraviolet upconversion emission of Gd3+ sensitized by Yb3+ and Ho3+ in β-NaLuF4 microcrystals under 980 nm excitation
- 14 February 2013
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry C
- Vol. 1 (13), 2485-2490
- https://doi.org/10.1039/c3tc00936j
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.Keywords
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