Simultaneous Enhancement and Modulation of Upconversion by Thermal Stimulation in Sc2Mo3O12 Crystals

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Hua Zou
  • Bing Chen
  • Yifeng Hu
  • Qiwei Zhang
  • Xusheng Wang

Detail(s)

Original languageEnglish
Pages (from-to)3020-3024
Journal / PublicationJournal of Physical Chemistry Letters
Volume11
Issue number8
Online published10 Mar 2020
Publication statusPublished - 16 Apr 2020

Abstract

Rational control of photoluminescence against a change in temperature is important for fundamental research and technological applications. Herein, we report an anomalous temperature dependence of upconversion luminescence in Yb/Ho co-doped Sc2Mo3O12 crystals. By leveraging negative thermal expansion of the crystal lattice, energy transfer between the lanthanide dopants is promoted as the temperature is increased from 303 to 573 K, resulting in an ∼5-fold enhancement of the emission. Meanwhile, the emission profile is also substantially altered due to the concurrent thermal quenching of selective energy states, corresponding to a clear shift in color from green to red. Via correlation of the red-to-green emission intensity ratio of Ho3+ dopant ions with temperature, a ratiometric luminescence thermometer is constructed with a maximum sensitivity of 2.75% K-1 at 543 K. As the Sc2Mo3O12 crystals are thermally stable and nonhygroscopic, our findings highlight a general approach for highly reversible control of upconversion by temperature in ambient air.

Research Area(s)

  • ENERGY-TRANSFER, EXPANSION, LUMINESCENCE, NANOPARTICLES, SENSITIVITY, RED

Citation Format(s)

Simultaneous Enhancement and Modulation of Upconversion by Thermal Stimulation in Sc2Mo3O12 Crystals. / Zou, Hua; Chen, Bing; Hu, Yifeng et al.
In: Journal of Physical Chemistry Letters, Vol. 11, No. 8, 16.04.2020, p. 3020-3024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review