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Luminescence, energy transfer and optical thermometry of a narrow red emitting phosphor: Cs2WO2F4:Mn4+

Abstract

A novel red emitting Cs2WO2F4:Mn4+ phosphors were successfully synthesized by a two-step wet chemical method. The crystal structure, morphology, and element composition were confirmed by powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy-dispersive X-ray spectrometer (EDS), respectively. Luminescence properties are investigated from emission, excitation and luminescence decay curves at the temperature region 10 – 500 K. The application of non-contact optical thermometry of Cs2WO2F4:Mn4+ based on the fluorescence intensity ratio (FIR) of the two coupled anti-Stokes and Stokes sidebands are discussed. The as-prepared Cs2WO2F4:Mn4+ phosphors show a bright narrow red emission at 632 nm under excitation of a blue lamp at 470 nm and they also present a broad and yellow-white intrinsic tungstate emission (~520 nm) under UV excitation. The mechanism of energy transfer from [WO2F4]2- (sensitizer) to Mn4+ (activator) is discussed.

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Publication details

The article was received on 28 Jul 2017, accepted on 08 Sep 2017 and first published on 08 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02751F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Luminescence, energy transfer and optical thermometry of a narrow red emitting phosphor: Cs2WO2F4:Mn4+

    P. Cai, L. QIN, C. Chen, J. Wang and H. J. Seo, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02751F

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