期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 9, 期 26, 页码 8323-8328出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc01532j
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资金
- Ministere de l'Enseignement Superieur et de la Recherche
- CNRS
- Universite de Versailles Saint Quentin en Yvelines
- Universite de Nantes
- College de France
- French National Research Agency (ANR) as part of the Investissements d'Avenir program [ANR-11-IDEX-0003-02, ANR-11-LABX-0039]
The study introduces a ratiometric luminescent thermometer based on lanthanide molecular species encapsulated in a lanthanide metal-organic framework, showing high relative thermal sensitivities.
The first example of ratiometric luminescent thermometers based on lanthanide molecular species encapsulated in a lanthanide metal-organic framework (MOF) is reported. In EuW10@Tb-TATB, the [EuW10O36](9-) polyoxometalate (POM) is incorporated into the cavities of the mesoporous terbium MOF Tb-TATB with two different POM loadings (9.1 and 19.5 wt%). Eu3+ and Tb3+ ions of the POM and MOF, respectively, act as dual emitters. Optical measurements evidence efficient Tb3+-to-Eu3+ energy transfer, suggesting that the EuW10 units are close to terbium centers. These observations are supported by computational investigations whereby a favored localisation of the EuW10 POM in the MOF's pores is found close to Tb-centers evidencing hydrogen bond type interactions between terminal oxygen atoms of the POM and Tb-coordinated water molecules. The reported materials act as temperature sensors in the physiological domain, exhibiting high relative thermal sensitivities of 2.68% K-1 and 2.37% K-1 at 300 K for the 9.1 wt% and 19.5 wt% composites, respectively, with a thermal uncertainty of 0.09 K.
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