Redox active materials, whose optical emission and absorption spectra are both electrically switchable, are said to be dual functional electrochromic and electrofluorochromic materials. They are intriguing for a wide range of applications, e.g., displays, smart-windows, sensing, information storage, and encryption/anticounterfeiting devices. Herein, we investigated the performance of benzothiadiazole-arylamine compounds serving as either anodic components or electroactive fluorophores, in dual functional electrochromic/electrofluorochromic solid state devices, fabricated as all-in-one ITO/gel/ITO sandwiches. We systematically investigated the electrochromic and electrofluorochromic responses of the devices, by varying the anode among a set of structurally different benzothiadiazole-arylamines and using the ethyl viologen as a cathodic component. All the devices show an interesting vis-NIR electrochromism with …