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|Title:||Multiphoton harvesting metal-organic frameworks||Authors:||Quah H.S.
metal organic framework
X ray powder diffraction
|Issue Date:||2015||Publisher:||Nature Publishing Group||Citation:||Quah H.S., Chen W., Schreyer M.K., Yang H., Wong M.W., Ji W., Vittal J.J. (2015). Multiphoton harvesting metal-organic frameworks. Nature Communications 6 : 7954. ScholarBank@NUS Repository. https://doi.org/10.1038/ncomms8954||Abstract:||Multiphoton upconversion is a process where two or more photons are absorbed simultaneously to excite an electron to an excited state and, subsequently, the relaxation of electron gives rise to the emission of a photon with frequency greater than those of the absorbed photons. Materials possessing such property attracted attention due to applications in biological imaging, photodynamic therapy, three-dimensional optical data storage, frequency-upconverted lasing and optical power limiting. Here we report four-photon upconversion in metal-organic frameworks containing the ligand, trans, trans-9,10-bis(4-pyridylethenyl)anthracene. The ligand has a symmetrical acceptor-Ï €-donor-Ï €-acceptor structure and a singlet biradical electronic ground state, which boosted its multiphoton absorption cross-sections. We demonstrate that the upconversion efficiency can be enhanced by Förster resonance energy transfer within host-guest metal-organic frameworks consisting of encapsulated high quantum yielding guest molecules. Using these strategies, metal-organic framework materials, which can exhibit frequency-upconverted photoluminescence excited by simultaneous multiphoton absorption, can be rationally designed and synthesized. © 2015 Macmillan Publishers Limited. All rights reserved.||Source Title:||Nature Communications||URI:||https://scholarbank.nus.edu.sg/handle/10635/175492||ISSN:||20411723||DOI:||10.1038/ncomms8954|
|Appears in Collections:||Staff Publications|
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