3 years ago

Multi-Photon Absorption in Metal–Organic Frameworks

Multi-Photon Absorption in Metal–Organic Frameworks
Roland A. Fischer, Lydia Nemec, Karsten Reuter, Venkatram Nalla, Marek Samoć, Sebastian Henke, Raghavender Medishetty
Multi-photon absorption (MPA) is among the most prominent nonlinear optical (NLO) effects and has applications, for example in telecommunications, defense, photonics, and bio-medicines. Established MPA materials include dyes, quantum dots, organometallics and conjugated polymers, most often dispersed in solution. We demonstrate how metal–organic frameworks (MOFs), a novel NLO solid-state materials class, can be designed for exceptionally strong MPA behavior. MOFs consisting of zirconium- and hafnium-oxo-clusters and featuring a chromophore linker based on the tetraphenylethene (TPE) molecule exhibit record high two-photon absorption (2PA) cross-section values, up to 3600 GM. The unique modular building-block principle of MOFs allows enhancing and optimizing their MPA properties in a theory-guided approach by combining tailored charge polarization, conformational strain, three-dimensional arrangement, and alignment of the chromophore linkers in the crystal. Nonlinear optical properties of metal–organic frameworks (MOFs) have been enhanced to record high multi-photon absorption cross-section values by following five design criteria, which are supported by theory.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201706492

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