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Advances in Synthesis Strategies for Lanthanide-Based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry
Progress In Electromagnetics Research M, Vol. 122, 117-136, 2023
nullThe optical characteristics and varied applications of lanthanide-doped NaYF4 upconversion nanocrystals have received considerable interest in recent years, such as in ratiometric thermometry. This review thoroughly examines the various synthesis processes utilized in producing these nanocrystals and their application in temperature sensing. Synthesis of NaYF4 upconversion nanocrystals is a complex procedure that requires careful management of dopant concentrations, crystal phase, size, and shape. The distinctive luminescent characteristics of lanthanide ions, which facilitate the transformation of photons with low energy into emissions with higher energy, render NaYF4 nanocrystals very suitable for ratiometric thermometry applications. We explore the fundamental concepts underlying upconversion luminescence in developing ratio metric temperature sensors. In this discourse, we examine the selection of lanthanide dopants, the mechanics underlying their energy transmission, and the development of customized sensor architectures. This review covers the recent progress and utilization of NaYF4 upconversion nanocrystals in ratiometric thermometry, including diverse areas such as biological temperature detection, environmental surveillance, and material research. We evaluate the obstacles and potential advancements in this domain, specifically emphasizing approaches to improving temperature sensors' precision, responsiveness, and applicability based on upconversion.
Raheel Ahmed Janjua, Wenbin Ji, Nayyar Abbas Shah, Julian Evans, Ruili Zhang, Sheng Zhang, and Sailing He, "Advances in Synthesis Strategies for Lanthanide-Based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry," Progress In Electromagnetics Research M, Vol. 122, 117-136, 2023.

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4. Liu, Jing, Ruitao Wu, Nana Li, Xin Zhang, Qiuqiang Zhan, and Sailing He, "Deep, high contrast microscopic cell imaging using three-photon luminescence of β-(NaYF:Er/NaYF) nanoprobe excited by 1480-nm CW laser of only 1.5-mW," Biomedical Optics Express, Vol. 6, No. 5, 1857-1866, 2015.

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6. Qian, Jun, Dan Wang, Fu-Hong Cai, Wang Xi, Li Peng, Zhen-Feng Zhu, Hao He, Ming-Lie Hu, and Sailing He, "Observation of multiphoton-induced fluorescence from graphene oxide nanoparticles and applications in in vivo functional bioimaging," Angewandte Chemie-international Edition, Vol. 51, No. 42, 10570-10575, 2012.

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