The yttrium organic framework (Y Tb Eu ) (BDC) (OH) (H O) (BDC=benzene-1,4-dicarboxylate) is hydrothermally stable up to at least 513 K and thermally stable in air in excess of 673 K. The relative intensities of luminescence of Tb and Eu are governed by Tb -to-Eu phonon-assisted energy transfer and Tb -to-ligand back transfer and are responsible for the differing temperature-dependent luminescence of the two ions. This provides a ratiometric luminescent thermometer in the 288-573 K temperature range, not previously seen for MOF materials, with a high sensitivity, 1.69±0.04 % K at 523 K. In aqueous conditions, loosely bound H O can be replaced by D O in the same material, which modifies decay lifetimes to yield a quantitative luminescent D O sensor with a useful sensitivity for practical application.
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| http://dx.doi.org/10.1002/chem.202200410 | DOI Listing |
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