Color-Switchable Glass and Display Devices Fabricated by Liquid Processes with Electrochromic Nanoparticle “Ink”

We developed the electrically color-switchable glass and information displays with electrochromic (EC) nanoparticle thin films. The devices were fabricated with liquid processes with the "ink" of multi-colored EC nanoparticles of Prussian blue and its analogues. The color switchable glass with spin-coated uniform EC films exhibits its color change between stained and colorless under applied voltage less than ±1.5 V. Serious degradation of the device was not observed even after the 10,000 times operations. We also made EC nanoparticle thin film with fine patterns. An EC device with such patterned films shows clear change of displayed image electrically.