{"type": "FeatureCollection", "features": [{"id": "10.1016/j.optmat.2025.117551", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:16:00Z", "type": "Journal Article", "created": "2025-09-24", "title": "Er3+/Yb3+ co-activated YNbO4 nanocrystalline phosphors: Up-conversion luminescence under the 980\u00a0nm excitation and integrated lifetime thermometry", "description": "This paper presents the structure, morphology, optical and photoluminescent properties of erbium (1 at %) and ytterbium (2 at %) doped yttrium niobium oxide (YNbO<inf>4</inf>) as a potential temperature sensor material. Obtained powder samples of fergusonite-\u03b2-like monoclinic crystalline structure of YNbO<inf>4</inf>, confirmed by X-ray diffraction analysis, showed particles of about 1\u20133 \u03bcm in size. Photoluminescence emissions were detected in the visible (Vis) and near-infrared (NIR) regions after excitation at 980 nm as a result of the energy up-conversion (UC) process. The lifetime of the most intense Er<sup>3+</sup> excited state <sup>4</sup>S<inf>3/2</inf> level measured at 300 K was 0.238 ms. Thermometric properties were recorded at different temperatures and analyzed for the first time using the luminescence emission decay method. The relative sensitivity decreases from 0.23 % to 0.085 % K<sup>\u22121</sup>, by varying the temperature from 300 to 600 K, indicating a good potential of this material for lifetime-based phosphor thermometry.", "keywords": ["Luminescence", "Powder processing", "Semiconductors", "Temperature sensing", "Nanocrystalline microstructure"], "contacts": [{"organization": "Tamara B. Iveti\u0107, Boris Banjac, Ljubica \u0110a\u010danin Far, Dragana \u0160trbac, Zoran Risti\u0107,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1016/j.optmat.2025.117551"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Optical%20Materials", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.optmat.2025.117551", "name": "item", "description": "10.1016/j.optmat.2025.117551", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.optmat.2025.117551"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2026-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Powder+processing&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Powder+processing&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Powder+processing&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Powder+processing&offset=1", "hreflang": "en-US"}], "numberMatched": 1, "numberReturned": 1, "distributedFeatures": [], "timeStamp": "2026-09-22T15:03:41.142725Z"}