Comment on “Charge Transfer-Triggered Bi3+ Near-Infrared Emission in Y2Ti2O7 for Dual-Mode Temperature Sensing”

Hei Yui Kai, Longbing Shang, Ka-Leung Wong*, Chang-Kui Duan*, Peter A. Tanner*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

3 Citations (Scopus)

Abstract

Undoped Y2Ti2O7 exhibits impurity emission bands at low temperatures due to Mn4+ and Cr3+, as established by codoping with these ions. Contrary to a recent report by Wang et al., ACS Appl. Mater. Interfaces 2022, 14, 36834-36844, we do not observe Bi3+ emission in this codoped host, as also is the case for Fe3+. The emission reported in that paper as being due to Bi3+ in fact corresponds to Cr3+ emission. The Cr3+ and Mn4+ emissions are quenched with increasing temperature, so that Mn4+ emission is scarcely observed above 80 K. We present variable temperature optical data for Y2Ti2O7 and this host codoped with Mn, Cr, Fe, and Bi, as well as a theoretical justification of our results.

Original languageEnglish
Pages (from-to)43226-43233
Number of pages8
JournalACS Applied Materials and Interfaces
Volume15
Issue number37
Early online date11 Sept 2023
DOIs
Publication statusPublished - 20 Sept 2023

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • Mn4+ emission
  • Cr3+ emission
  • Fe3+ emission
  • impurity emission
  • pyrochlore
  • Bi3+ doping

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