Mn2+-activated dual-wavelength emitting materials toward wearable optical fibre temperature sensor

Enhai Song (), Meihua Chen, Zitao Chen, Yayun Zhou, Weijie Zhou, Hong-Tao Sun, Xianfeng Yang, Jiulin Gan (), Shi Ye and Qinyuan Zhang ()
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Enhai Song: South China University of Technology
Meihua Chen: South China University of Technology
Zitao Chen: South China University of Technology
Yayun Zhou: South China University of Technology
Weijie Zhou: South China University of Technology
Hong-Tao Sun: National Institute for Materials Science (NIMS)
Xianfeng Yang: South China University of Technology
Jiulin Gan: South China University of Technology
Shi Ye: South China University of Technology
Qinyuan Zhang: South China University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Photothermal sensing is crucial for the creation of smart wearable devices. However, the discovery of luminescent materials with suitable dual-wavelength emissions is a great challenge for the construction of stable wearable optical fibre temperature sensors. Benefiting from the Mn2+-Mn2+ superexchange interactions, a dual-wavelength (530/650 nm)-emitting material Li2ZnSiO4:Mn2+ is presented via simple increasing the Mn2+ concentration, wherein the two emission bands have different temperature-dependent emission behaviours, but exhibit quite similar excitation spectra. Density functional theory calculations, coupled with extended X-ray absorption fine structure and electron-diffraction analyses reveal the origins of the two emission bands in this material. A wearable optical temperature sensor is fabricated by incorporating Li2ZnSiO4:Mn2+ in stretchable elastomer-based optical fibres, which can provide thermal-sensitive emissions at dual- wavelengths for stable ratiometric temperature sensing with good precision and repeatability. More importantly, a wearable mask integrated with this stretchable fibre sensor is demonstrated for the detection of physiological thermal changes, showing great potential for use as a wearable health monitor. This study also provides a framework for creating transition-metal-activated luminescence materials.

Date: 2022
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DOI: 10.1038/s41467-022-29881-6

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