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Issue 13, 2017
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Enhancement of upconversion, temperature sensing and cathodoluminescence in the K+/Na+ compensated CaMoO4:Er3+/Yb3+ nanophosphor

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Abstract

Charge compensated alkali metal ions (Na+, K+) codoped CaMoO4:Er3+/Yb3+ nano-flakes were synthesized via a hydrothermal method. The effect of doping concentration of Na+ and K+ ions on upconversion luminescence in CaMoO4:Er3+/Yb3+ was investigated with respect to its dependence on input pump power and external temperature using 980 nm laser light excitation. Simultaneous incorporation of K+/Na+ into CaMoO4:Er3+/Yb3+ showed 36 and 5 times enhancements in green and red emission intensities, which were explained in terms of charge compensation and lifetime variation in the 4S3/2 and 4F9/2 levels of Er3+ ions. A high thermal sensitivity of the material was realized with K+/Na+ incorporation using the fluorescence intensity ratio technique of two thermally coupled energy levels (2H11/2 & 4S3/2) of Er3+. The temperature sensitivity was enhanced by four times by K+/Na+ codoping with a maximum sensitivity of 0.0216 K−1 at 490 K. Additionally, the cathodoluminescence properties of the material as a function of filament current and accelerating voltage were also explored and showed enhanced luminescence, which is suitable for field emission display device applications. The results show that simultaneous codoping of K+/Na+ in CaMoO4:Er3+/Yb3+ is a very effective way to integrate this material for advanced photonic applications.

Graphical abstract: Enhancement of upconversion, temperature sensing and cathodoluminescence in the K+/Na+ compensated CaMoO4:Er3+/Yb3+ nanophosphor

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Publication details

The article was received on 07 Jan 2017, accepted on 05 May 2017 and first published on 08 May 2017


Article type: Paper
DOI: 10.1039/C7NJ00086C
Citation: New J. Chem., 2017,41, 5362-5372
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    Enhancement of upconversion, temperature sensing and cathodoluminescence in the K+/Na+ compensated CaMoO4:Er3+/Yb3+ nanophosphor

    S. Sinha, M. K. Mahata, H. C. Swart, A. Kumar and K. Kumar, New J. Chem., 2017, 41, 5362
    DOI: 10.1039/C7NJ00086C

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