Developing Luminescent Ratiometric Thermometers Based on a Covalent Organic Framework (COF)


Covalent Organic Frameworks (COFs), an emerging class of crystalline porous materials, are proposed as a new type of support for grafting lanthanide ions (Ln(3+)) and employing these hybrid materials as ratiometric luminescent thermometers. ATpBpy-COF-prepared from 1,3,5-triformyl-phloroglucinol (Tp) and 2,2'-bipyridine-5,5'-diamine (Bpy) grafted with Eu/Tb and Dy acetylacetone (acac) complexes can be successfully used as a luminescent thermometer in the 10-360 K (Eu) and 280-440 K (Tb) ranges with good sensing properties (thermal sensitivity up to 1.403% K-1, temperature uncertainty delta T < 1 K above 110 K). For the Eu/Tb systems, we observe an unusual and rarely reported behavior, that is, no thermal quenching of the Tb3+ emission, a result of the absence of ion-to-ligand/host energy back-transfer. The LnCOF materials proposed here could be a new class of materials employed for temperature-sensing applications following up on the well-known luminescent metal-organic framework thermometers.






Kaczmarek, AM; Liu, YY; Kaczmarek, MK; Liu, HS; Artizzu, F; Carlos, LD; Van Der Voort, P

nossos autores


A.M.K. acknowledges Ghent University for funding and thanks Prof. Rik VanDeun for access to the Edinburgh Instruments Spectrofluorometer in his lab. L.D.C. thanks the project CICECO-Aveiro Institute of Materials (FCT UID/CTM/50011/2019). Y.-Y.L. and H.L. acknowledge financial support from the International S&T Cooperation Program of China (2016YFE0109800) and the Fundamental Research Fund for the Central Universities of China (DUT17JC20). P.V.D.V. acknowledges the Research Foundation-Flanders, Belgium (FWO-Vlaanderen) for financial support through project 3G000117.

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