Flexible and High‐Performance Solution‐Processable Single‐Detector Organic Spectrometer

Abstract Spectrometers are indispensable tools for civil and military‐related optoelectronic applications. To meet the requirements of the revolutionary data/AI‐driven era, next‐generation spectrometers must not only be flexible with minimal sizes but exhibit high accuracy and resolution. In this study, a compact, high‐performance, and flexible organic spectrometer is reported, fabricated using solution processing, which employs an optical cascade architecture by integrating organic electrochromic devices and photodetectors. This organic spectrometer can not only achieve a resolution of 0.56 nm, an accuracy of 0.14 nm, and a broad detection range from 400 to 1000 nm but also realize a vital absolute spectral irradiance measurement ranging from 10 −8 to 10 −4 W cm −2 nm −1 . Additionally, its intrinsic flexibility and highly replaceable feasibility of bandgap‐tunable organic materials enable their high applicability with excellent portability and adaptability in the upcoming data/AI‐driven era or scenarios.