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Mixed-Lanthanoid Metal-Organic Framework for Ratiometric Cryogenic Temperature Sensing
Xue Liu1, Sebastiaan Akerboom1, Mathijs de Jong2
1Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands.
Inorganic Chemistry
|November 25, 2015
Summary
This study introduces a novel ratiometric thermometer using a mixed-metal lanthanide (Ln(III)) metal-organic framework. This thermometer demonstrates high sensitivity across a broad temperature range, from 4 to 290 K.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Lanthanide(III) metal-organic frameworks (Ln(III) MOFs) are promising for luminescent sensing applications.
- Developing accurate thermometers for wide temperature ranges, especially cryogenic temperatures, remains a challenge.
Purpose of the Study:
- To develop a ratiometric thermometer with high sensitivity and a broad operating temperature range.
- To investigate the sensing mechanism in a mixed-metal Ln(III) MOF.
Main Methods:
- Synthesis of a mixed-metal Ln(III) MOF: Tb0.95Eu0.05HL, where H4L is 5-hydroxy-1,2,4-benzenetricarboxylic acid.
- Characterization of the material's luminescent properties.
- Temperature-dependent luminescence measurements from 4 to 290 K.
Main Results:
- The ratiometric thermometer exhibited good sensitivity from 4 to 290 K.
- A quantum yield of 22% was achieved at room temperature.
- Exceptional sensitivity up to 31% K(-1) was observed at 4 K.
- The sensing mechanism involves phonon-assisted energy transfer and migration between Tb(III) ions.
Conclusions:
- The reported mixed-metal Ln(III) MOF functions as an effective ratiometric thermometer.
- The material demonstrates excellent performance, particularly at cryogenic temperatures.
- This work highlights the potential of Ln(III) MOFs for advanced thermometry.
