Near‐Infrared Circularly Polarized Electroluminescence with Switchable Handedness in Organic LEDs

Abstract In this study, the development of the first fully‐organic circularly polarized near‐infrared organic light–emitting diode (CP‐NIR‐OLED) is presented. The devices are made by using a co‐assembled active layer consisting of a commercially available NIR‐emitting indacenodithienothiophene‐based molecule (ITIC) and a chiral inducer. Here, ITIC, which is traditionally utilized as non‐fullerene acceptor in organic photovoltaics for its superior characteristics, is demonstrated to act as an effective NIR emitter for solution‐processed OLEDs. By incorporating the chiral additive into the active layer, the emission is successfully polarized, achieving CP‐NIR‐OLEDs with dissymmetry values up to 0.074 and a maximum radiance of 1.65 Wsr⁻¹m⁻². Additionally, this study shows that by manipulating the position of the radiative exciton recombination zone within the active layer, the circular polarization sign can be switched, while maintaining and even enhancing device performance. This CP‐NIR‐OLEDs also exhibit remarkable operational stability, indicating their potential for short‐term applications. This work provides a significant step forward in the development of CP‐OLEDs and opens new avenues for their use in advanced near‐infrared optoelectronic devices.