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Issue 3, 2018
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Up-conversion quantum yields of SrF2:Yb3+,Er3+ sub-micron particles prepared by precipitation from aqueous solution

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Abstract

Herein, we report near-infrared-to-visible up-conversion (UC) in SrF2:Yb3+,Er3+ sub-micron crystals prepared via a facile route in an aqueous solution. Subsequent calcination at 600 °C allows us to achieve good UC quantum yields, reaching 2.8% at an excitation power density of 10 W cm−2 for a sample doped with 2 mol% of Yb3+ and 2 mol% of Er3+. This UC quantum yield of SrF2:Yb3+,Er3+ is in the range of record UC quantum yields reported in the literature for standard host systems such as La2O2S, BaY2ZnO5 and NaYF4 phosphors. Interestingly, the 2 mol% of Yb3+ required to achieve optimal UC in the SrF2 host is much lower than the amount of Yb3+ required in the other host systems. Furthermore, we studied the population and depopulation kinetics of the Er3+:2H9/2, Er3+:2H11/2,4S3/2 and Er3+:4F9/2 states using time-resolved photoluminescence measurements in order to provide insight into the UC mechanism. The facile preparation method combined with high UC quantum yield makes SrF2:Yb3+,Er3+ materials attractive candidates for solar energy harvesting, sensors, solid state lasers, and luminescent markers.

Graphical abstract: Up-conversion quantum yields of SrF2:Yb3+,Er3+ sub-micron particles prepared by precipitation from aqueous solution

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Publication details

The article was received on 28 Oct 2017, accepted on 19 Dec 2017 and first published on 19 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04913G
Citation: J. Mater. Chem. C, 2018,6, 598-604
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    Up-conversion quantum yields of SrF2:Yb3+,Er3+ sub-micron particles prepared by precipitation from aqueous solution

    S. Kuznetsov, Yu. Ermakova, V. Voronov, P. Fedorov, D. Busko, I. A. Howard, B. S. Richards and A. Turshatov, J. Mater. Chem. C, 2018, 6, 598
    DOI: 10.1039/C7TC04913G

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