{
  "abstract": "Developing highly emissive and photoswitchable lanthanide complexes for advanced anticounterfeiting materials requires overcoming a fundamental photophysical bottleneck: the intrinsic competition between the emission quantum yield (Φ em ) and the isomerization quantum yield (Φ closing ). Traditionally, maximizing photoconversion results in severely quenched, impractical ON-states. Here, we present a counter-intuitive molecular design strategy that deliberately lowers the isomerization quantum yield in favor of increasing the initial lanthanide emission while preserving a high ON-OFF intensity ratio. Using click-chemistry, we synthesized a unique ligand scaffold integrating a dithienylethene (DTE) photochrome with a pyridinebis(oxazoline) (pybox) antenna. Upon coordination, the resulting europium(III) and samarium(III) complexes exhibit a finely tuned moderate isomerization quantum yield (Φ closing = 0.25-0.27). This deliberate moderation preserves a very high emission in the ON-state, reaching a quantum yield of Φ em = 0.22 for the europium(III) complex, alongside a significant Φ em = 0.02 for the rarely investigated samarium(III) analogue. Despite their modest photoconversion, these systems maintain an important ON/OFF contrast with less than 10% residual luminescence at the photostationary state in solution. Finally, incorporating these complexes into PMMA polymer matrices leads to an optical modulation which is easy to detect with the naked eye, even in daylight, thus providing a robust framework for designing practically operative dynamic materials.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "Yoann Fréroux"
    },
    {
      "name": "Salauat Kiraev"
    },
    {
      "name": "Marie Dallon"
    },
    {
      "name": "Olivier Maury"
    },
    {
      "name": "Stéphane Rigaut"
    },
    {
      "name": "Lucie Norel"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/46y5xwefbsab1.bib",
  "cited_by": 0,
  "doi": "10.1039/d6qi01446a",
  "fulltext_url": null,
  "id": "46y5xwefbsab1",
  "issns": [
    "2052-1545",
    "2052-1553"
  ],
  "landing_url": "https://hal.science/hal-05781353v1",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.chim"
    ],
    [
      "hal",
      "1.chim.inor"
    ],
    [
      "openalex",
      "2505|Lanthanide and Transition Metal Complexes"
    ]
  ],
  "openalex": "W7214278901",
  "pdf_url": "https://pubs.rsc.org/qi/article-pdf/doi/10.1039/D6QI01446A/14779967/d6qi01446a.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": "Royal Society of Chemistry",
  "ris": "https://research.draconitic.com/paper/46y5xwefbsab1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:49Z",
      "native_id": "hal-05781353",
      "source": "hal",
      "url": "https://hal.science/hal-05781353v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "hal:1.chim.inor",
      "subfield": "inorganic"
    }
  ],
  "title": "Reconciling visible emission intensity and ON/OFF commutation ratio in photochromic lanthanide complexes of europium(III) and samarium(III)",
  "title_text": "Reconciling visible emission intensity and ON/OFF commutation ratio in photochromic lanthanide complexes of europium(III) and samarium(III)",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:49Z",
  "url": "https://research.draconitic.com/paper/46y5xwefbsab1",
  "venue": "Inorganic Chemistry Frontiers",
  "versions": [
    {
      "doi": "10.26434/chemrxiv.15008231/v1",
      "pid": "fpyj3dt9cz9zd",
      "relation": "preprint",
      "title": "Reconciling visible emission intensity and ON/OFF commutation ratio in photochromic lanthanide complexes of europium(III) and samarium(III).",
      "venue": "ChemRxiv"
    }
  ]
}