title: Mixed-Lanthanoid Metal-Organic Framework for Ratiometric Cryogenic Temperature Sensing.
abstract: A ratiometric thermometer based on a mixed-metal Ln(III) metal-organic framework is reported that has good sensitivity in a wide temperature range from 4 to 290 K and a quantum yield of 22% at room temperature. The sensing mechanism in the europium-doped compound Tb0.95Eu0.05HL (H4L = 5-hydroxy-1,2,4-benzenetricarboxylic acid) is based not only on phonon-assisted energy transfer from Tb(III) to Eu(III) centers, but also on phonon-assisted energy migration between neighboring Tb(III) ions. It shows good performance in a wide temperature range, especially in the range 4-50 K, reaching a sensitivity up to 31% K(-1) at 4 K.
authors.affiliation: Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands.
authors.forename: Xue
authors.initials: X
authors.lastname: Liu
authors.affiliation: Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands.
authors.forename: Sebastiaan
authors.initials: S
authors.lastname: Akerboom
authors.affiliation: Debye Institute for Nanomaterials Science, Utrecht University , Princetonplein 5, 3584 CC Utrecht, The Netherlands.
authors.forename: Mathijs
authors.initials: M
authors.lastname: de Jong
authors.affiliation: Department of Chemistry, University of Helsinki , P.O. Box 55, A.I. Virtasenaukio 1, FI-00014 Helsinki, Finland.
authors.forename: Ilpo
authors.initials: I
authors.lastname: Mutikainen
authors.affiliation: Van't Hoff Institute for Molecular Sciences, University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands.
authors.forename: Stefania
authors.initials: S
authors.lastname: Tanase
authors.affiliation: Debye Institute for Nanomaterials Science, Utrecht University , Princetonplein 5, 3584 CC Utrecht, The Netherlands.
authors.forename: Andries
authors.initials: A
authors.lastname: Meijerink
authors.affiliation: Leiden Institute of Chemistry, Leiden University , P.O. Box 9502, 2300 RA Leiden, The Netherlands.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Bouwman