Issue 3, 2023

Energy transfer from self-trapped excitons to rare earth ions in Cs2ZrCl6 perovskite variants

Abstract

Rare earth ion doping in metal halides has been a promising method for imparting and tailoring their optical and optoelectronic performances towards versatile optical applications. In this work, the relationships among intrinsic self-trapped excitons (STEs), sub-band gap defects and rare earth ions Tb3+ in Cs2ZrCl6:Tb3+ perovskite variants were established. Cs2ZrCl6 exhibits dual emission, deriving from the intrinsic STEs and sub-band gap defects owing to the Zr4+ or Cl vacancies, respectively. Doping Tb3+ facilitated the characteristic emission (5D47FJ=6,5,4,3) of Tb3+ ions and the energy transfer from STEs to Tb3+ ions. Moreover, the participation of defect states and thermally activated delayed fluorescence (TADF) might lead to a high concentration of STEs, which in turn causes the abnormal thermal quenching effect. These findings not only provide a more in-depth understanding of the luminescence properties of Cs2ZrCl6, but also provide a new direction towards achieving tunable emission colors based on the energy transfer from STEs to rare earth ions.

Graphical abstract: Energy transfer from self-trapped excitons to rare earth ions in Cs2ZrCl6 perovskite variants

Supplementary files

Article information

Article type
Paper
Submitted
02 Nov 2022
Accepted
09 Dec 2022
First published
09 Dec 2022

J. Mater. Chem. C, 2023,11, 1095-1102

Energy transfer from self-trapped excitons to rare earth ions in Cs2ZrCl6 perovskite variants

C. Fang, J. Yang, G. Zhou, Z. Zhang, Y. Mao, X. Yun, L. Liu, D. Xu, X. Li and J. Zhou, J. Mater. Chem. C, 2023, 11, 1095 DOI: 10.1039/D2TC04657A

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