A Robust Mixed‐Lanthanide PolyMOF Membrane for Ratiometric Temperature Sensing

Abstract

Temperature sensors play as ignificant role in biology,c hemistry,a nd engineering, especially those that can work accurately in anoninvasive manner.Weadopted aphotoinduced post-synthetic copolymerization strategy to realize amembranous ratiometric luminescent thermometer based on the emissions of two lanthanide ions.T his novel mixedlanthanide polyMOF membrane exhibits not only the integrity and temperature sensing behaviour of the Ln-MOF powder but also excellent mechanical properties,s uch as flexibility, elasticity,a nd processability.M oreover,t he polyMOF membrane shows remarkable stability under harsh conditions, including high humidity,s trong acid and alkali (pH 0-14), which allowed the mapping of temperature distributions in extreme circumstances.T his work highlights as imple strategy for polyMOF membrane formation and pushes forwardt he further practical application of Ln-MOF-based luminescent thermometers in various fields and conditions.

Lanthanide-MOFs as multifunctional luminescent sensors

“…21 Membranes with optical functions can be directly produced in factories and applied in practical situations, largely expanding the scope of application and improving the utilization efficiency. 22 In summary, the use of Ln-MOFs and polymer composites as luminescent materials deserves attention.…”

Hydrogels with both mechanical strength and luminescence anisotropy

“…[34][35][36] Upon excitation at 280 nm, the Tb-containing hydrogel exhibited four sharp emissions at 490, 544, 583, and 622 nm, assigned to the 5 D 4 to 7 F J ( J = 6, 5, 4, 3) transitions, among which the 5 D 4 → 7 F 5 peak was prominent and responsible for a green emission. 37,38 The emission spectrum of the Eu-containing hydrogel exhibited five sharp peaks at 584, 594, 615, 650, and 693 nm, corresponding to the 5 D 0 to 7 F J ( J = 0-4) transitions, among which the 5 D 0 → 7 F 2 peak was dominant and a red emission was observed. 39,40 Interestingly, our hydrogel showed evident anisotropic emission behaviors.…”

Recent Advances in Developing Lanthanide Metal–Organic Frameworks for Ratiometric Fluorescent Sensing

“…Modulating the Ln–Ln energy transfer is a straightforward way to tune the emission ratio of two lanthanide ions and correlate with the concentration of analytes ( Zhang et al, 2016a ; Zhao et al, 2019 ; Wu et al, 2020b ; Feng et al, 2020 ). For example, Zhang and coworkers developed a dual-emitting Tb/Eu(BTC) probe for the rapid detection of dipicolinic acid (DPA) biomarker ( Zhang et al, 2016a ).…”

“…And the color output of Tb/Eu(BTC) sensor changes from orange-red to yellow-green after adding DPA in the solution or dropping onto test strips ( Figure 2L ). Another great example of using an analyte to modulate Ln–Ln energy transfer is for ratiometric temperature sensing ( Yang et al, 2020c ; Feng et al, 2020 ). Feng et al developed Eu 0.0025 Tb 0.9975 -BABDC-PBMA membrane.…”

“…Feng et al developed Eu 0.0025 Tb 0.9975 -BABDC-PBMA membrane. H 2 BABDC is an ideal “antenna chromophore” to sensitize both Eu 3+ and Tb 3+ , and therefore generate dual emission ( Feng et al, 2020 ). They found that the intensity ratio of 5 D 4 → 7 F 5 (Tb 3+ )/ 5 D 0 → 7 F 2 (Eu 3+ ) can be linear related to the temperature from 90 to 240 K. And the energy transfer from Tb 3+ to Eu 3+ was responsible for the unique temperature-dependent luminescent behavior.…”