{
  "abstract": "Non-contact thermometry in the near infrared (NIR) region could enable minimally invasive thermal mapping in biological applications. Yet, existing probes often face trade-offs among sensitivity, brightness, and thermal stability. Here, we developed a single-ion Nd3+-based NIR thermometer, Bi1-xNdxPO4 (x = 0.20-0.40), via integrating several key structure-property considerations. The optimized composition Bi0.70Nd0.30PO4 in monazite structure , synthesized by a high-temperature solid-state reaction, delivers an ultra-high relative sensitivity of 6.62 %K-1 with temperature resolution of 0.29 K at 313 K, while exhibiting no measurable thermal quenching up to 673 K. Remarkably, its NIR-I emission is detectable even under an excitation power as low as 30 μW, highlighting efficient emission at ultra-low excitation. By integrating high sensitivity, thermal robustness, and low-power operation into a single Nd3+-emitting platform, this work establishes a materials design route toward practical NIR thermometry for biological and other demanding environments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "name": "Inderjeet Singh"
    },
    {
      "name": "Rajamani Nagarajan",
      "orcid": "0000-0002-0983-7814"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9jx49nhf2kc88.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15010008/v1",
  "fulltext_url": null,
  "id": "9jx49nhf2kc88",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010008/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 Properties of Advanced Materials"
    ]
  ],
  "openalex": "W7220833053",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15010008/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/9jx49nhf2kc88.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "10.26434/chemrxiv.15010008",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010008/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2505|Luminescence Properties of Advanced Materials",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Surpassing the sensitivity limit and thermal quenching barrier in NIR luminescent thermometry in monazite BiPO4 concentrated with Nd",
  "title_text": "Surpassing the sensitivity limit and thermal quenching barrier in NIR luminescent thermometry in monazite BiPO4 concentrated with Nd",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/9jx49nhf2kc88",
  "venue": "ChemRxiv",
  "versions": []
}