The enhanced up-conversion green by Yb-Mn dimer in NaBiF4:Yb3+/Er3+/Mn2+ for optical fiber temperature sensor

• Published in: Journal of alloys and compounds 2021-12, Vol.888, p.161497, Article 161497
• Main Authors: Guo, Yue, Xie, Jinhui, Yu, Mingxun, Huang, Wentao, Yang, Huijie, Li, Xibing, Wang, Lixi, Zhang, Qitu
• Format: Article
• Language: English
• Subjects: Dimers; Doping; Emission spectra; Erbium; Fluorescence; Green emission; NaBiF4; Optical fibers; Optical temperature sensing; Preliminary designs; Sensors; Temperature sensors; Up-conversion; Upconversion; Ytterbium
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.161497

•Preliminary application of optical temperature sensor based on upconversion luminescence of NaBiF4:Yb3+/Er3+/Mn2+.•Mn2+-doping significantly increased the proportion of green emission as well as the overall luminescence intensity.•Yb-Mn dimer is utilized to explain the tendency of luminescence intensity towards Mn2+ concentration and temperature. [Display omitted] Through doping Mn2+ into the NaBiF4:Yb3+/Er3+, it can be achieved that NaBiF4 :Yb3+/Er3+/Mn2+ possess superior temperature sensing performance and application in temperature optical fiber sensing on the premise of enhancing the green emission upon the 980 nm excitation. The effect of Mn2+ content on the phase and luminescence of NaBiF4:Yb3+/Er3+/Mn2+ is investigated by X-ray diffraction (XRD) and fluorescence spectrophotometer characterization. The up-conversion (UC) green emission intensity is enhanced by 3 times by Mn2+ doping. The Yb3+-Mn2+ dimer is introduced to clarify the mechanism of UC red and green emission enhancement, where involved in is three-photon process. Moreover, the optical thermometric behaviors of the synthetic compounds are analyzed according to the fact that Er3+ processes a couple of green emission levels 2H11/2 and 4S3/2, and the maximum Sa (absolute sensor sensitivity) reaches 0.00559 K−1. The preliminary design and application of NaBiF4:Yb3+/Er3+/Mn2+ as a probe in the temperature optical fiber sensor has been carried out, suggesting that NaBiF4: Yb3+/Er3+/Mn2+ is expected to be a kind of promising material for non-contact optical thermometer.