首页|Self-Powered Flexible Multicolor Electrochromic Devices for Information Displays
Self-Powered Flexible Multicolor Electrochromic Devices for Information Displays
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The development of self-powered flexible multicolor electrochromic(EC)systems that could switch different color without an external power supply has remained extremely challenging.Here,a new trilayer film structure for achieving self-powered flexible multicolor EC displays based on self-charging/discharging mechanism is proposed,which is simply assembled by sandwiching an ionic gel film between 2 cathodic nickel hexacyanoferrate(NiHCF)and Prussian blue(PB)nanoparticle films on indium tin oxide substrates.The display exhibits independent self-powered color switching of NiHCF and PB films with fast responsive time and high reversibility by selectively connecting the Al wire as anodes with the 2 EC films.Multicolor switching is thus achieved through a color overlay effect by superimposing the 2 EC films,including green,blue,yellow,and colorless.The bleaching/coloration process of the displays is driven by the discharging/self-charging mechanism for NiHCF and PB films,respectively,ensuring the self-powered color switching of the displays reversibly without an external power supply.It is further demonstrated that patterns can be easily created in the self-powered EC displays by the spray-coating method,allowing multicolor changing to convey specific information.Moreover,a self-powered ionic writing board is demonstrated based on the self-powered EC displays that can be repeatedly written freehand without the need of an external power source.We believe that the design concept may provide new insights into the development of self-powered flexible multicolor EC displays with self-recovered energy for widespread applications.
Wenzhao Xue、Yun Zhang、Feng Liu、Yao Dou、Mei Yan、Wenshou Wang
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School of Chemistry and Chemical Engineering,University of Jinan,Jinan 250022,P.R.China
National Natural Science Foundation of ChinaTaishan Scholars ProgramNatural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong Province
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