Dual-Feedbacked Temperature Sensing of Er3+in Fusiform-Polycrystalline-Implanted BaYF5/PAN Electrospun Fibers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)12107–12117
Journal / PublicationJournal of Physical Chemistry C
Issue number22
Online published26 May 2021
Publication statusPublished - 10 Jun 2021


Ba(Y1-x-yErxYby)F5/polyacrylonitrile (BYF-EY/PAN) composite fibers have been prepared by adopting the electrospinning technology, and fusiform-polycrystalline-implanted fibers can be fused with a thermal response function and excellent flexibility. Upconversion emission displays quadratic and cubical dependence of the photoluminescence intensity on the pumping power, confirming two-photon- and three-photon-induced processes, respectively. Among them, the intense green emission ascribed to 2H11/2/4S3/24I15/2 transitions is appointed as the main indicator of noncontact temperature sensing, and the faintish blue-violet emission originated from 4G11/2/2H9/24I15/2 transitions can be served as an auxiliary monitoring channel to calibrate deviation, thereby improving operational accuracy. At a relatively moderate working temperature (363 K), the absolute sensitivity and relative sensitivity of composite fibers reach as high as 0.455 and 0.832% K-1 for main sensing and 0.391 and 2.176% K-1 for auxiliary sensing, respectively. The developed BYF-EY/PAN fiber with outstanding dual-feedbacked temperature sensing is promising to act as flexible sensing elements in fabrics and biomedical devices.