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

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.