期刊
FRONTIERS IN CHEMISTRY
卷 8, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2020.624592
关键词
lanthanide; luminescence; dual emission; ratiometric sensing; metal– organic frameworks
资金
- National Natural Science Foundation of China [51802198, 51902355]
- Sun Yat-sen University
Fluorescent probes have been used in developing optical sensor systems for their reliable and rapid fluorescent response upon reaction with analytes. Ratiometric fluorescent sensors, utilizing emission intensity ratio at different wavelengths, show higher sensitivity and allow fast visual screening of analytes. Lanthanide metal-organic frameworks are highly designable luminescent materials and have been widely employed as ratiometric fluorescent sensors.
Fluorescent probes have attracted special attention in developing optical sensor systems due to their reliable and rapid fluorescent response upon reaction with the analyte. Comparing to traditional fluorescent sensing systems that employ the intensity of only a single emission, ratiometric fluorescent sensors exhibit higher sensitivity and allow fast visual screening of analytes because of quantitatively analyzing analytes through the emission intensity ratio at two or more wavelengths. Lanthanide metal-organic frameworks (LnMOFs) are highly designable multifunctional luminescent materials as lanthanide ions, organic ligands, and guest metal ions or chromophores are all potential sources for luminescence. They thus have been widely employed as ratiometric fluorescent sensors. This mini review summarized the basic concept, optical features, construction strategies, and the ratiometric fluorescent sensing mechanisms of dual-emitting LnMOFs. The review ends with a discussion on the prospects, challenges, and new direction in designing LnMOF-based ratiometric fluorescent sensors.
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