Downshifting in Cs2NaBiCl6:Er3+: transforming ultraviolet into near infrared radiation

Anjun Huang, Chang-Kui Duan, Ka-Leung Wong*, Peter A. Tanner*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

15 Citations (Scopus)


The outstanding assets of stability and non-toxicity have produced a surge of research interest into lead-free double perovskite halides for photovoltaic and optoelectronic applications. Here we report the near infrared (NIR) downshifting of micron and nanoparticle (NP)-size erbium-doped Cs2NaBiCl6 under ultraviolet excitation. The 1.54 nm emission of Er3+ is obtained by the population of the 4I13/2 level by an internal Er3+ temperature-dependent cross-relaxation process and also from bismuth energy transfer. The NIR emission can be switched from sharp to broad band by selective excitation. The doped NPs may be dispersed in organic solvents and the emission intensity can be tuned by choice of solvent.

Original languageEnglish
Pages (from-to)2950-2954
Number of pages5
JournalJournal of Materials Chemistry C
Issue number8
Early online date3 Feb 2022
Publication statusPublished - 28 Feb 2022

Scopus Subject Areas

  • Materials Chemistry
  • Chemistry(all)


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