Abstract
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.
Highlights
Fluorescent probes have attracted special attention in developing optical sensor systems due to their reliable and rapid fluorescent response upon reaction with the analyte (Vendrell et al, 2012)
We provide a general overview of the design principles of Lanthanide metal–organic frameworks (LnMOFs) with multiple luminescent centers
This mini review provides a brief overview of the strategies to construct a dual-emitting LnMOF-based ratiometric fluorescent sensor
Summary
Fluorescent probes have attracted special attention in developing optical sensor systems due to their reliable and rapid fluorescent response upon reaction with the analyte (Vendrell et al, 2012). Various kinds of fluorescence probes based on organic dye molecules, semiconductor quantum dots (QDs) have been developed (Wu et al, 2020a; Yang et al, 2020a; Pfeifer et al, 2020). These probes have several limitations in detecting or sensing. Organic dyes suffer from several drawbacks such as poor chemical stability and rapid photobleaching, making it impossible for long-term fluorescence sensing. Lanthanide-based fluorescent probes can surpass the aforementioned inherent limitations of organic dyes or quantum dots due to their excellent properties, including low toxicity and better stability. Lanthanide luminescence features rich linelike emission bands, large Stokes shift, and high resistance to photobleaching, making the lanthanide-based luminescent materials superior in sensing applications
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
