Hybrid excitation mechanism of upconversion fluorescence in hollow La2Ti2O7 : Tm3+/Yb3+ submicron fibers

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

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Author(s)

  • Run Zhou
  • Peijian Lin
  • Hai Lin
  • Jinliang Yuan
  • Xin Zhao

Detail(s)

Original languageEnglish
Pages (from-to)4633-4645
Journal / PublicationJournal of Materials Science
Volume55
Issue number11
Online published20 Dec 2019
Publication statusPublished - Apr 2020

Abstract

High-crystalline, hollow-mesh-like Tm3+/Yb3+-co-doped La2Ti2O7 (LTO) submicron fibers are prepared by electrospinning technique and identified as monoclinic structure. The LTO matrix fibers and the Tm3+/Yb3+-co-doped fibers exhibit different frequency upconversion luminescence. The fluorescence of the matrix at the 487 and 542 nm is ascribed to the two-photon absorption and the cross-relaxation processes caused by the defect center at 977 nm excitation, respectively. The upconversion luminescence intensity enhances when the rare-earth ions are incorporated into LTO fibers. The emissions of Tm3+ in co-doped LTO membranes at 479 and 789 nm under the excitation of 977 nm indicate the effectiveness of the three- and two-photon absorption processes, respectively. The pristine LTO fibers have the potential to be employed for water purification as a laser-excited photocatalytic material because the LTO materials are conducive to absorbing the highly penetrating NIR laser. Furthermore, the Tm3+/Yb3+ ions play a positive role in further promoting the laser-absorption capacity, and the hybrid excitation mechanism in the Tm3+/Yb3+-co-doped LTO composite fibers provides a new perspective for the development of anti-laser inorganic materials.

Research Area(s)

  • PHOTOCATALYTIC ACTIVITIES, OPTICAL-PROPERTIES, OXYGEN VACANCIES, FACILE SYNTHESIS, LUMINESCENCE, EMISSION, TEMPERATURE, PHOTOLUMINESCENCE, NANOFIBERS, PHOSPHOR

Citation Format(s)

Hybrid excitation mechanism of upconversion fluorescence in hollow La2Ti2O7 : Tm3+/Yb3+ submicron fibers. / Zhou, Run; Lin, Peijian; Pun, Edwin Yue Bun et al.

In: Journal of Materials Science, Vol. 55, No. 11, 04.2020, p. 4633-4645.

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