Issue 31, 2020
From the journal:

RSC Advances

Unravelling the true MOF-5 luminescence†

Vincent Villemot,a   Matthieu Hamel, ORCID logo a   Robert B. Pansu,b   Isabelle Lerayb  and  Guillaume H. V. Bertrand ORCID logo *a  

* Corresponding authors

a CEA, LIST, Laboratoire Capteurs et Architectures Électroniques, Gif-sur-Yvette Cedex, France
E-mail: guillaume.bertrand@cea.fr

b ENS Paris Saclay, UMR CNRS 8531, Cachan, France

Abstract

Highly pure millimeter-sized MOF-5 single crystals were synthesized and characterized. Photoluminescence (PL) spectroscopy and time-correlated single photon counting (TCSPC) demonstrate a solvent-guest dependency of MOF-5 emission and its ligand-centred nature. These results allow measuring the true MOF-5 luminescence free of solvent at a wavelength of 355 nm, a significantly lower wavelength than previously published. MOF-5 emission was also evaluated with different solvents and various degrees of water intake, explaining previously published observations. Comparison between lifetimes shows the fluorophore stabilization within the frameworks and demonstrates the progressive influence of the Zn4O subunits on the fluorescence during hydration. Overall, this work highlights the necessity to obtain phase-pure material, especially when moisture sensitivity can play a role, before ascribing electronic transitions. This study is a rigorous new take on the iconic MOF-5 and on its photoluminescence properties.

Graphical abstract: Unravelling the true MOF-5 luminescence

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Article information

DOI
https://doi.org/10.1039/D0RA02509G
Article type
Paper
Submitted
18 Mar 2020
Accepted
03 May 2020
First published
14 May 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 18418-18422

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Unravelling the true MOF-5 luminescence

V. Villemot, M. Hamel, R. B. Pansu, I. Leray and G. H. V. Bertrand, RSC Adv., 2020, 10, 18418 DOI: 10.1039/D0RA02509G

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