Circularly polarized lanthanide luminescence for advanced security inks

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MacKenzie, Lewis E. and Pal, Robert (2020) Circularly polarized lanthanide luminescence for advanced security inks. Nature Reviews Chemistry, 5. 109–124. ISSN 2397-3358 (https://doi.org/10.1038/s41570-020-00235-4)

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Abstract

Authenticating products and documents with security inks is vital to global commerce, security and health. Lanthanide complexes are widely used in luminescent security inks owing to their unique and robust photophysical properties. Lanthanide complexes can also be engineered to undergo circularly polarized luminescence (CPL), which encodes chiral molecular fingerprints in luminescence spectra that cannot be decoded by conventional optical measurements. However, chiral CPL signals have not yet been exploited as an extra security layer in advanced security inks. This Review introduces CPL and related concepts that are necessary to appreciate the challenges and potential of lanthanide-based, CPL-active security inks. We describe recent advances in CPL analysis and read-out technologies that have expedited CPL-active security ink applications. Further, we provide a systematic meta-analysis of strongly CPL-active EuIII, TbIII, SmIII, YbIII, CmIII, DyIII and CrIII complexes, discussing the suitability of their photophysical properties and highlighting promising candidates. We conclude by providing key recommendations for the development and advancement of the field.

ORCID iDs

MacKenzie, Lewis E. ORCID logoORCID: https://orcid.org/0000-0002-8151-0525 and Pal, Robert;
  • Item type:Article
    ID code:77940
    Dates:
    Date
    Event
    7 December 2020
    Published
    28 October 2020
    Accepted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:30 Sep 2021 07:52
    Last modified:19 Dec 2024 07:04
    URI:https://strathprints.strath.ac.uk/id/eprint/77940
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