AI Article Synopsis
- Combining metal-organic frameworks (MOFs) with chiral liquid crystals (CLCs) allows for the creation of liquid crystalline MOFs (LCMOFs) that exhibit enhanced functionality, particularly in circular polarization luminescence (CPL).
- The study presents a method for creating chiral liquid crystalline MOF (CLCMOF) thin films by cross-linking CLCs with MOF thin films, which demonstrate strong chirality and the ability to switch CPL properties through light and heat.
- The successful development of CLCMOF thin films holds potential for applications in advanced information anticounterfeit and encryption, showcasing a novel approach in optical technologies.
Article Abstract
Combining metal-organic frameworks (MOFs) with liquid crystals to construct liquid crystalline MOFs (LCMOF) offers the advantage of endowing and enhancing their functionality, yet it remains a challenging task. Herein, we report chiral liquid crystalline MOF (CLCMOF) thin films by cross-linking the chiral liquid crystals (CLC) with MOF thin films to realize highly circular polarization luminescence (CPL) performance with photo and thermal switching. By layer by layer cross-linking stilbene-containing CLC with stilbene-based MOF (CLC/MOF) thin film, the CLCMOF thin films were successfully obtained after UV irradiation due to the abundant [2 + 2] photocycloaddition. The resulted CLCMOF thin films have strong chirality, obvious photochromic fluorescent, and strong CPL performance (the asymmetry factor reaches to 0.4). Furthermore, due to the photochromic fluorescent MOF and thermotropic CLC, the CPL can be reversed and red-shifted after heating and UV irradiation treatment, showing photo- and thermal CPL switching. Such MOF-based CPL thin films with photo/thermal CPL switching were prepared to patterns and codes for the demonstration of potential application in advanced information anticounterfeit and encryption. This study not only opens a strategy for developing chiral thin films combining MOFs and liquid crystals but also offers a new route to achieve CPL switching in optical applications.
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| http://dx.doi.org/10.1021/jacs.4c04125 | DOI Listing |
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