3 years ago

Electrochromic Metallo-Organic Nanoscale Films: Fabrication, Color Range, and Devices

Electrochromic Metallo-Organic Nanoscale Films: Fabrication, Color Range, and Devices
Dana Cohen, Linda J. W. Shimon, Tatyana Bendikov, Katya Rechav, Neta Elool Dov, Milko E. van der Boom, Michal Lahav, Sreejith Shankar
In this study, we demonstrate a versatile approach for the formation of electrochromic nanoscale assemblies on transparent conductive oxides on both rigid and flexible substrates. Our method is based on the application of alternating spin-coated layers of well-defined metal polypyridyl complexes and a palladium(II) salt to form electrochemically addressable films with a high chromophore density. By varying the central metal ion of the polypyridyl complexes (Os, Ru, and Fe) and their ligands and by mixing these complexes, coatings with a wide range of colors can be achieved. These coatings cover a large area of RGB color space. The coloration intensities of these nanoscale films can be tuned by the number of deposition steps. The materials have very attractive ON/OFF ratios, electrochemical stabilities, and coloration efficiencies. Reversible color-to-colorless and color-to-color transitions were demonstrated, and the films were further integrated into sandwich cells.

Publisher URL: http://dx.doi.org/10.1021/jacs.7b04217

DOI: 10.1021/jacs.7b04217

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