Striking Change in Radiative Lifetime and Asymmetry Ratio with Temperature for the Double Perovskite Cs2NaEuCl6

Daiwen Xiao, Hei Yui Kai, Guohua Jia, Ka-Leung Wong*, Peter A. Tanner*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

Abstract

The measurement of quantum yield (QY) is an important process for a phosphor. This is often accomplished by the comparison of the low-temperature lifetime with the room temperature (RT) lifetime. It is shown that this procedure provides a considerable underestimation of QY in certain cases. Additionally, the use of the europium ion as an indicator of changes in site symmetry with temperature has severe limitations. This work reveals that a decrease in measured lifetime with increasing temperature of a system cannot always be associated with a descent in site symmetry and may be due to increasing radiative rate.

Original languageEnglish
Article number2302261
Number of pages6
JournalAdvanced Optical Materials
Volume12
Issue number10
Early online date23 Nov 2023
DOIs
Publication statusPublished - 4 Apr 2024

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

User-Defined Keywords

  • double perovskite
  • europium
  • negative thermal quenching
  • quantum yield
  • radiative lifetime

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