Color e-paper technology with silver electrodeposition-based electrochromism (Conference Presentation)

Multifunctional electrochromic (EC) materials which control multiple colors, various color density, and specular reflection are expected to be potential candidate for light-modulation device and novel reflective display device. Electrodeposition is also attractive method to create colors [1-6] because silver (Ag) nanoparticles exhibit various optical states based on their localized surface plasmon resonance (LSPR). LSPR bands of metal nanoparticles are affected by the size and shape. The control of LSPR, therefore, must enable dramatic changes in color for the surface where nanoparticles are deposited. We successfully demonstrate the first LSPR-based multicolor EC device enabling reversible control of six optical states—transparent, silver mirror, cyan, magenta, yellow and black. We will discuss the mechanism of electrodeposition and a wide range of its applications. <br/> References; [1] Adv. Mater., 24, 122 (2012), [2)] Adv. Mater., 25, 3197 (2013), [3)] Chem. Mater., 26, 6477 (2014), [4] Nanoscale, 12, 23975 (2020), [5] Adv. Mater. Tech., 6, 200081 (2021), [6] Sol. Ener. Mater. & Sol. Cells, 251, 112 (2023)