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Optical temperature-sensing properties in La 1.55 SiO 4.33 :Yb 3+ ,Ho 3+ phosphors affected by Ho 3+ -doping concentration

Journal of Luminescence, ISSN: 0022-2313, Vol: 261, Page: 119940
2023
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  • Citations
    3
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      3

Article Description

In this paper, the Yb 3+ -Ho 3+ co-doped La 1.55 SiO 4.33 (LSO) phosphors were synthesized by the conventional solid-state reaction method. The phase purity and morphology of the samples were studied by XRD and SEM, respectively. Under 980 nm excitation, the upconversion (UC) luminescence of the LSO:Yb 3+,Ho 3+ phosphors was checked for different Ho 3+ doping content and pump power. The corresponding UC mechanism was interpreted from the changing decay lifetimes and the energy transfer processes between Yb 3+ and Ho 3+ ions. Meanwhile, the temperature-dependent emission spectra were analyzed to learn the optical temperature-sensing behaviors with the fluorescence intensity ratio (FIR) method. The results revealed that the FIR (I 658 /I 544 ) value increased when the temperature rose, which followed a linear function. The sensor sensitivity was evaluated, and the LSO:10%Yb 3+,2%Ho 3+ phosphor showed the highest absolute sensitivity. Besides, the main population way on 5 F 5 level of Ho 3+ for red emission was clarified by the comparison of the UC spectra excited by continuous-wave and pulse light. Based on the above results, the LSO:Yb 3+,Ho 3+ phosphor can be considered as a new UC luminescent material for optical temperature sensors.

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