Chromogenic materials exhibit tunable properties as a consequence of an external stimulus such as light (photochromism), temperature (thermochromism) or potential (electrochromism..). Those smart compounds find applications in buildings and automobile industry by controlling light and heat transfer through windows for transmissive devices while colour changes in reflective devices offer great interest in the field of displays and printed electronics. Focusing on electrochromism, an appropriate answer to the various fields of applications requires an adjustment of both the material and the device architecture. Through various examples, we will illustrate how we can tune either the optical contrast, the memory effect, the processability, of oxides or polymer based hybrids ink , of which electrochromic performance are highlighted in 5 to 3 layers devices built in vertical or side to side configuration.
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