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Issue 38, 2015
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KMnF3:Yb3+,Er3+@KMnF3:Yb3+ active-core–active-shell nanoparticles with enhanced red up-conversion fluorescence for polymer-based waveguide amplifiers operating at 650 nm

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Abstract

We demonstrated optical amplification at 650 nm in KMnF3:Yb3+,Er3+@KMnF3:Yb3+ active-core–active-shell nanoparticle (NP) doped polymer waveguides pumped by a 976 nm laser diode for the first time. KMnF3:Yb3+,Er3+ NPs were synthesized via a solvothermal method. With the excitation of a 976 nm laser diode, bright red upconversion (UC) fluorescence was observed from KMnF3:Yb3+,Er3+ NPs owing to the existence of efficient energy transfer between Er3+ and Mn2+:2H11/2,4S3/2 + 6A14I15/2 + 4T1,2H9/2 + 6A14I13/2 + 4T1 and 4I15/2 + 4T14F9/2 + 6A1. The red UC emissions originated from the 4F9/24I15/2 transition of Er3+. Furthermore, the red UC emissions of KMnF3:18 mol% Yb3+,1 mol% Er3+@KMnF3:2 mol% Yb3+ NPs were enhanced by 7.5 times compared to that of KMnF3:18 mol% Yb3+,1 mol% Er3+ core-only NPs after coating an active shell containing Yb3+ ions on the core-only NPs. The above results showed that the active-shell could be used to not only suppress surface quenching but also transfer the pump light to the core region efficiently through Yb3+ ions inside the active-shell. By using KMnF3:18 mol% Yb3+,1 mol% Er3+@KMnF3:2 mol% Yb3+ NPs as the gain medium and doping NPs into a polymer waveguide, we constructed polymer-based waveguide amplifiers. For an input signal power of 7.4 mW and a pump power of 45.2 mW, a relative optical gain of ∼3.5 dB was obtained at 650 nm in a 17 mm-long waveguide.

Graphical abstract: KMnF3:Yb3+,Er3+@KMnF3:Yb3+ active-core–active-shell nanoparticles with enhanced red up-conversion fluorescence for polymer-based waveguide amplifiers operating at 650 nm

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Publication details

The article was received on 20 Jun 2015, accepted on 03 Sep 2015 and first published on 04 Sep 2015


Article type: Paper
DOI: 10.1039/C5TC01838B
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J. Mater. Chem. C, 2015,3, 9827-9832

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    KMnF3:Yb3+,Er3+@KMnF3:Yb3+ active-core–active-shell nanoparticles with enhanced red up-conversion fluorescence for polymer-based waveguide amplifiers operating at 650 nm

    Y. Zhang, F. Wang, Y. Lang, J. Yin, M. Zhang, X. Liu, D. Zhang, D. Zhao, G. Qin and W. Qin, J. Mater. Chem. C, 2015, 3, 9827
    DOI: 10.1039/C5TC01838B

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