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Cationic Polyelectrolyte for Anionic Cyanines: An Efficient Way To Translate Molecular Properties into Material Properties

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journal contribution
posted on 15.10.2019 by Zhong’an Li, Akbar A. Syed, Peng Zhao, Jeffrey C. Yang, Rajesh Sharma, Trenton R. Ensley, Jonathan D. Matichak, Iryna Davydenko, Sei-Hum Jang, David J. Hagan, Seth R. Marder, Eric W. Van Stryland, Alex K.-Y. Jen
In this work, a new phosphonium-containing cationic polyelectrolyte (PE1) has been rationally designed and developed via a facile click-chemistry type postfunctionalization, which can form complexes with highly polarizable anionic cyanines to significantly reduce the strong and random cyanine–cyanine interactions (i.e., aggregation) in the solid-state. This material design strategy enables an efficient translation of the favorable molecular properties of cyanines into macroscopic material properties. One of such complexes exhibits a very large third-order susceptibility over 10–10 esu with low nonlinear optical loss suitable for all optical signal processing.