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Issue 3, 2018
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Excitation power dependent optical temperature behaviors in Mn4+ doped oxyfluoride Na2WO2F4

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Abstract

A Mn4+ doped Na2WO2F4 phosphor was synthesized through a two-step wet chemical method. The relationship between crystal structure and luminescence properties is discussed and unusual strong intense zero phonon lines (ZPLs) have been found in a distorted octahedral environment. The power dependent luminescence spectra exhibit the existence of down conversion luminescence intensity saturation under a high pumping power limit. The fluorescence intensity ratios of anti-Stokes bands to the ZPL and Stokes bands reveal an obvious temperature dependent relationship based on thermal de-population from the low states to the upper states of an intrinsic Mn4+ 2Eg → 4A2g transition. The temperature dependent emission intensity of Mn4+ is investigated by changing the excitation power, and an optical temperature sensitivity as high as 0.00658 K−1 is achieved at 193 K with the intensity ratio of anti-Stokes bands to the ZPL under 488 nm excitation by a Xenon lamp. This work presents a new method to realize optical thermometry at low temperature by controlling the intensity ratio of the anti-Stokes bands to the ZPL.

Graphical abstract: Excitation power dependent optical temperature behaviors in Mn4+ doped oxyfluoride Na2WO2F4

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Publication details

The article was received on 19 Oct 2017, accepted on 08 Dec 2017 and first published on 11 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP07123J
Citation: Phys. Chem. Chem. Phys., 2018,20, 2028-2035
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    Excitation power dependent optical temperature behaviors in Mn4+ doped oxyfluoride Na2WO2F4

    P. Cai, X. Wang and H. J. Seo, Phys. Chem. Chem. Phys., 2018, 20, 2028
    DOI: 10.1039/C7CP07123J

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