Time-resolved circularly polarized luminescence of Eu3+-based systems

Uri Hananel, Gal Schwartz, Guy Paiss, Lorenzo Arrico, Francesco Zinna, Lorenzo Di Bari, Ori Cheshnovsky, Gil Markovich

Research output: Contribution to journalArticlepeer-review

Abstract

Chiral Eu3+-based systems are frequently studied via circularly polarized luminescence spectroscopy. The emission lifetimes of each circular polarization, however, are virtually always ignored, because in a homogeneous sample of emitters, there should be no difference between the two. However, we show that in less robust Eu3+ complex structures, as in the chiral complex Eu (facam)3, a difference in the lifetimes of the two circularly polarized emission components arises due to heterogeneity of the complexes. In this case, each species within the sample could have different degrees of circularly polarized luminescence and decay rates at certain emission lines. The superposition of the emission components of the various chiral species leads to an overall difference in decay rate between the two circular polarizations. Such a difference is also shown for Eu3+-doped chiral TbPO4·D2O nanocrystals. We believe that this kind of measurement could be a unique tool for determining the homogeneity of a lanthanide-based chiral system, where other methods might fail in this task.

Original languageEnglish
Pages (from-to)124-133
Number of pages10
JournalChirality
Volume33
Issue number3
DOIs
StatePublished - Mar 2021

Keywords

  • chiral complexes
  • chiral nanocrystals
  • emission lifetime
  • lanthanide complexes

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