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Issue 46, 2019
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Improving LMOF luminescence quantum yield through guest-mediated rigidification

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Abstract

Luminescent metal–organic frameworks (LMOFs) are among the fastest growing solid-state optical materials and have been studied for a wide variety of applications. However, when developing a new LMOF, it can be challenging to balance a strong luminescence quantum yield with all other important properties required by the intended application (appropriate excitation/emission wavelengths, chemical and physical stability, low toxicity, etc.). Being able to post-synthetically improve a LMOF's quantum yield is valuable, as it offers additional tunability in materials design and modification. As framework flexibility can limit quantum yield, post-synthetic methods of rigidifying an LMOF have the potential to improve its performance. This paper discusses a pair of nearly identical isoreticular LMOFs, and uses them as a model system to investigate how framework flexibility affects quantum yield. Introducing optically-inactive guests into a LMOF pore is shown to be an effective method for rigidifying the framework, improving the quantum yield of a flexible LMOF from 12.2% to 59.3%—an improvement of nearly 400%.

Graphical abstract: Improving LMOF luminescence quantum yield through guest-mediated rigidification

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Supplementary files

Article information


Submitted
22 Sep 2019
Accepted
07 Nov 2019
First published
08 Nov 2019

J. Mater. Chem. C, 2019,7, 14739-14744
Article type
Paper

Improving LMOF luminescence quantum yield through guest-mediated rigidification

W. P. Lustig, S. J. Teat and J. Li, J. Mater. Chem. C, 2019, 7, 14739
DOI: 10.1039/C9TC05216J

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