abstract
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.
keywords
TEMPERATURE-RANGE; NANOPARTICLES; NONCONTACT
subject category
Chemistry
authors
Kaczmarek, AM; Liu, YY; Kaczmarek, MK; Liu, HS; Artizzu, F; Carlos, LD; Van Der Voort, P
our authors
Luís Carlos
Full professoracknowledgements
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.