A comprehensive review on polyoxometalate-based electrochromic materials and their applications in electrochromic devices.

All data is available in the main text or the supplementary materials. Received: ((will be filled in by the editorial staff)) Revised: ((will be filled in by the editorial staff)) Published online: ((will be filled in by the editorial staff)) Push-pull NIR dyes are used as emitters in light-emitting electrochemical cells. Control of the host energy levels and interactions with the dyes enables strong NIR emission, up to 835 nm, with peak irradiances comparable with polymer or transition metal complex lightemitting cells.