Temperature sensitivity based on Er3+ fluorescence fluctuation in Gd2Ti2O7 : Er3+-Yb3+ porous nanofibers

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

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Author(s)

Detail(s)

Original languageEnglish
Article number155554
Number of pages9
Journal / PublicationJournal of Alloys and Compounds
Volume838
Online published14 May 2020
Publication statusPublished - 15 Oct 2020

Abstract

(Gd1−x−yErxYby)2Ti2O7 (GTOEY) fibers were synthesized by electrospinning technique and heat-treatment processes, in which nano-scale fibers vested with homogeneous porous morphology, high crystallinity and elevated temperature heat-resistance. Under 977 nm laser excitation, GTOEY nanofibers exhibit effective frequency upconversion (UC) fluorescence, therefore, the violent green and dimmed red UC emissions are identified as two-photon absorption processes, attributing to 2H11/2/4S3/24I15/2 and 4F9/24I15/2 radiation transitions of Er3+, respectively. Moreover, the temperature sensitivity based on UC emission fluctuation of Er3+ over a wide temperature range of 303–633 K has been derived. Thereby, having used a 980 nm laser and achieved green UC luminescence of GTOEY fibers centered at 525 and 545 nm, the maximum absolute and relative sensitivity values are obtained to be 0.382% K−1 and 1.12% K−1, respectively. These significant results demonstrate that the GTOEY nanofibers with distinct porous structure and admirable photothermal sensitivities can be regarded as a promising temperature sensing material used for overheating alarm and safety protection equipment.

Research Area(s)

  • Porous GTOEY nanofibers, Frequency upconversion, Optical thermosensitive behavior, FIR technique, Electrospinning