{
  "abstract": "Self‐trapped excitons (STEs) play an important role in the luminescence of halide materials, yet their formation and manipulation in complex fluorides remain largely underexplored. Here, Mn4+‐doped Li2HfF6 phosphors were synthesized by room‐temperature coprecipitation to investigate impurity‐modulated STEs and their role in Mn4+ sensitization. High‐resolution neutron powder diffraction reveals impurity‐associated phase separation into two closely related Li2HfF6 lattices. Photoluminescence and cathodoluminescence measurements resolve two broad host‐emission components: STE1, assigned to intrinsic Li2HfF6, and redshifted STE2, associated with a K‐containing lattice. Under high‐energy cathodoluminescence excitation, enhanced Mn4+ red emission correlates with STE2 emission but not with STE1 emission, supporting a selective STE2 → Mn4+ energy‐transfer pathway. Density functional theory ΔSCF (self‐consistent field) calculations yield distinct relaxed STE1 and STE2 configurations, confirming the K‐induced redshift of the STE emission. These results identify K‐associated STE2 as a key sensitizing state for Mn4+ luminescence, establishing impurity modulation as an effective strategy for tuning excitonic emission and host‐to‐activator energy transfer in complex fluoride phosphors.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Chemistry, Physics, and Materials Science Fayetteville State University Fayetteville North Carolina USA",
    "Center for Nanoscale Materials Argonne National Laboratory Lemont Illinois USA",
    "Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee USA",
    "NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland USA"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 9,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Menuka Adhikari"
    },
    {
      "affs": [
        0
      ],
      "name": "Thomas Murray"
    },
    {
      "affs": [
        0
      ],
      "name": "Cameron J. Lewis"
    },
    {
      "affs": [
        0
      ],
      "name": "Jett Wu"
    },
    {
      "affs": [
        1
      ],
      "name": "Hari Adhikari",
      "orcid": "0009-0006-2686-0756"
    },
    {
      "affs": [
        2
      ],
      "name": "Cheng Li",
      "orcid": "0000-0002-6546-6413"
    },
    {
      "affs": [
        1
      ],
      "name": "Jianguo Wen",
      "orcid": "0000-0002-3755-0044"
    },
    {
      "affs": [
        3
      ],
      "name": "Hui Wu",
      "orcid": "0000-0003-0296-5204"
    },
    {
      "affs": [
        0
      ],
      "name": "Zhiping Luo",
      "orcid": "0000-0002-8264-6424"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8za5an8dnjxqv.bib",
  "cited_by": 0,
  "doi": "10.1002/advs.78338",
  "fulltext_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13712481/",
  "id": "8za5an8dnjxqv",
  "issns": [
    "2198-3844"
  ],
  "landing_url": "https://doi.org/10.1002/advs.78338",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "Research Article"
    ],
    [
      "openalex",
      "2505|Luminescence Properties of Advanced Materials"
    ]
  ],
  "openalex": "W7223860271",
  "pdf_url": "https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/advs.78338",
  "pmcid": "PMC13712481",
  "pmid": "42945119",
  "published": "2026-10-27",
  "publisher": "Wiley",
  "ris": "https://research.draconitic.com/paper/8za5an8dnjxqv.ris",
  "sources": [
    {
      "first_seen": "2026-10-31T12:23:02Z",
      "native_id": "PMC13712481",
      "source": "pmc",
      "url": "https://doi.org/10.1002/advs.78338"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Luminescence Properties of Advanced Materials",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Potassium‐Impurity‐Modulated Self‐Trapped Excitons and Energy Transfer in Phase‐Separated, Mn4+‐Doped Li2HfF6",
  "title_text": "Potassium‐Impurity‐Modulated Self‐Trapped Excitons and Energy Transfer in Phase‐Separated, Mn4+‐Doped Li2HfF6",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T12:23:02Z",
  "url": "https://research.draconitic.com/paper/8za5an8dnjxqv",
  "venue": "Advanced Science",
  "versions": []
}