{
  "abstract": "Redoxluminochromic materials are useful for switchable optoelectronic devices that change the emission properties upon a redox stimulus. Typically, ON/OFF switches are realized, while materials with redox-induced changes of emission color are exceedingly rare. Here, we report a near-infrared II emissive vanadium(III) chromophore [V(tpe)2]3+ with an emission band peaking at 1110 nm. Its detailed photophysical properties including (ultrafast and long) excited state dynamics are elucidated by variabletemperature fs-ns transient absorption spectroscopy and luminescence spectroscopy. Together with its one-electron reduced counterpart [V(tpe)2]2+ (emission maximum at 1375 nm), we establish a proof-of-concept that d2/d3 spin-flip emitters can constitute redoxluminochromic materials, which switch luminescence from 1000–1200 nm to 1300–1600 nm in the very challenging near-infrared II spectral region.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "name": "Alexandra König-Schäfer"
    },
    {
      "name": "Robert Naumann"
    },
    {
      "name": "Christoph Förster"
    },
    {
      "name": "Jan Klett"
    },
    {
      "name": "Katja Heinze",
      "orcid": "0000-0003-1483-4156"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/agqs39ctq3h24.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15010464/v1",
  "fulltext_url": null,
  "id": "agqs39ctq3h24",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010464/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2505|Luminescence and Fluorescent Materials"
    ]
  ],
  "openalex": "W7221773932",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15010464/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/agqs39ctq3h24.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:24Z",
      "native_id": "10.26434/chemrxiv.15010464",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010464/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Luminescence and Fluorescent Materials",
      "subfield": "materials-polymers"
    }
  ],
  "title": "A Redox-Switchable NIR II-to-NIR II Photoluminescent Vanadium(III/II) Redox Couple",
  "title_text": "A Redox-Switchable NIR II-to-NIR II Photoluminescent Vanadium(III/II) Redox Couple",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:24Z",
  "url": "https://research.draconitic.com/paper/agqs39ctq3h24",
  "venue": "ChemRxiv",
  "versions": []
}