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
- 3Citations
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- Citations3
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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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0022231323002739; http://dx.doi.org/10.1016/j.jlumin.2023.119940; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85160002213&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0022231323002739; https://dx.doi.org/10.1016/j.jlumin.2023.119940
Elsevier BV
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