Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Mar;33(3):124-133.
doi: 10.1002/chir.23293. Epub 2020 Dec 30.

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

Uri Hananel  1 , Gal Schwartz  1 , Guy Paiss  1 , Lorenzo Arrico  2 , Francesco Zinna  2 , Lorenzo Di Bari  2 , Ori Cheshnovsky  1 , Gil Markovich  1
Affiliations

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

Uri Hananel et al. Chirality. 2021 Mar.

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 ·D2 O 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.

Keywords: chiral complexes; chiral nanocrystals; emission lifetime; lanthanide complexes.

PubMed Disclaimer

References

REFERENCES AND NOTES

    1. Richardson FS, Riehl JP. Circularly polarized luminescence spectroscopy. Chem Rev. 1977;77(6):773-792.
    1. Kumar J, Nakashima T, Kawai T. Circularly polarized luminescence in chiral molecules and supramolecular assemblies. J Phys Chem Lett. 2015;6(17):3445-3452.
    1. Sְanchez-Carnerero EM, Agarrabeitia AR, Moreno F, et al. Circularly polarized luminescence from simple organic molecules. Chem a Eur J. 2015;21(39):13488-13500.
    1. Arrico L, Di Bari L, Zinna F. Quantifying the overall efficiency of circularly polarized emitters. Chem a Eur J. 2020. https://doi.org/10.1002/chem.202002791
    1. Schauerte JA, Steel DG, Gafni A. Time-resolved circularly polarized protein phosphorescence. Proc Natl Acad Sci U S a. 1992;89(21):10154-10158.

Publication types