{"title":"Optical Properties of LaF3–LaOF:Yb3+/Tm3+ Upconversion Phosphors: Influence of Annealing Temperature and Time","authors":"Toshihiro Nonaka, Yutaro Inoue, Mutsuto Yamamoto, Shin-Ichi Yamamoto","doi":"10.1007/s13538-024-01665-x","DOIUrl":null,"url":null,"abstract":"<p>In this study, LaF<sub>3</sub>–LaOF:Yb<sup>3+</sup>/Tm<sup>3+</sup> upconversion phosphors were synthesized using a solid-state reaction method, and the effects of annealing conditions on their crystal structure and optical properties were examined. The crystal structure, analyzed using an X-ray diffractometer, revealed a transition from LaF<sub>3</sub> to LaOF as the annealing temperature and time increased. The photoluminescence (PL) characteristics revealed emission peaks at wavelengths of 477, 485, 795, and 803 nm. In addition, the PL intensity increased under annealing conditions of 1150℃ for 1–3 h. The pump-power dependence of the PL intensity suggested potential thermal quenching. Finally, the temperature characteristics were analyzed, yielding an absolute sensitivity of 0.0081 K<sup>−1</sup> and a relative sensitivity of 0.65% K<sup>−1</sup>.</p>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Brazilian Journal of Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s13538-024-01665-x","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, LaF3–LaOF:Yb3+/Tm3+ upconversion phosphors were synthesized using a solid-state reaction method, and the effects of annealing conditions on their crystal structure and optical properties were examined. The crystal structure, analyzed using an X-ray diffractometer, revealed a transition from LaF3 to LaOF as the annealing temperature and time increased. The photoluminescence (PL) characteristics revealed emission peaks at wavelengths of 477, 485, 795, and 803 nm. In addition, the PL intensity increased under annealing conditions of 1150℃ for 1–3 h. The pump-power dependence of the PL intensity suggested potential thermal quenching. Finally, the temperature characteristics were analyzed, yielding an absolute sensitivity of 0.0081 K−1 and a relative sensitivity of 0.65% K−1.
期刊介绍：
The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.
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