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Issue 14, 2018
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Simultaneous size adjustment and upconversion luminescence enhancement of β-NaLuF4:Yb3+/Er3+,Er3+/Tm3+ microcrystals by introducing Ca2+ for temperature sensing

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Abstract

β-NaLuF4:Yb3+/Er3+ microcrystals have been obtained through a facile hydrothermal method at a relatively low temperature (180 °C) within only two hours. By introducing Ca2+ ions, the microcrystals can simultaneously be tunable in size and realize upconversion luminescence enhancement. It is found that when the concentration of Ca2+ ions increases from 0 to 20 mol%, the average diameter of disks increases while the height decreases. However, with the concentration of Ca2+ further increasing, the opposite is true. This result can be ascribed to the capping effect of F on the different crystal faces. More importantly, the upconversion luminescence intensities of green and red emissions of β-NaLuF4:Yb3+/Er3+ with 40 mol% Ca2+ ion doping are about 7.5 and 7.9 times higher than those of the sample without Ca2+ doping, respectively. Besides, the Ca2+ doping can also be extended to β-NaLuF4:Er3+/Tm3+ for enhancement of the upconversion luminescence. Eventually, emphasis will be on the temperature-dependent upconversion properties of β-NaLuF4:20Yb3+/2Er3+/40Ca2+ (mol%) and Ca2+-free samples. The maximum sensitivity of β-NaLuF4:20Yb3+/2Er3+/40Ca2+ (mol%) (0.00040 K−1) is higher than that of β-NaLuF4:20Yb3+/2Er3+ (mol%) (0.00021 K−1) at 120 K under the same excitation pump power of 1 W, indicating that the sample with Ca2+ has potential for application to temperature sensing.

Graphical abstract: Simultaneous size adjustment and upconversion luminescence enhancement of β-NaLuF4:Yb3+/Er3+,Er3+/Tm3+ microcrystals by introducing Ca2+ for temperature sensing

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Publication details

The article was received on 26 Jan 2018, accepted on 01 Mar 2018 and first published on 05 Mar 2018


Article type: Paper
DOI: 10.1039/C8CE00127H
Citation: CrystEngComm, 2018,20, 2029-2035
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    Simultaneous size adjustment and upconversion luminescence enhancement of β-NaLuF4:Yb3+/Er3+,Er3+/Tm3+ microcrystals by introducing Ca2+ for temperature sensing

    A. Zhou, F. Song, Y. Han, F. Song, D. Ju and X. Wang, CrystEngComm, 2018, 20, 2029
    DOI: 10.1039/C8CE00127H

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