Perovskite Quantum Dot/AIEgen Hybrids With Exceptional Photostability and Near‐Unity Luminance Efficiency

ABSTRACT Perovskite quantum dots (QDs) and aggregation‐induced‐emission luminogens (AIEgens) are both widely investigated luminescent materials, yet both materials suffer from poor photostability and nonradiative recombination loss. Herein, we report on a hybrid luminescent system that combines CsPbBr 3 QDs with an AIEgen molecule (TBBA) to overcome these intrinsic drawbacks. The resulting CsPbBr 3– TBBA hybrid exhibits exceptional photostability and an almost unity PLQY. The intense absorption of CsPbBr 3 QDs enabled them to function as optical antennas, efficiently transferring their excitons to the AIEgens in 43.1 ps with near‐unity yield. This rapid extraction of the excitation energy from CsPbBr 3 QDs and avoidance of ultraviolet photon absorption in AIEgens effectively solved the photostability issues for these two individuals, resulting in remarkable photostability (effective half‐life of 1800 days under outdoor solar illumination). Additionally, strong restriction of intramolecular motions for AIEgens grafted onto the QD surface led to near‐unity photoluminescence efficiency, with minimized reabsorption loss, which was leveraged to demonstrate efficient large‐area luminescent solar concentrator devices. This work introduces a general strategy for constructing hybrid luminescent materials that unify high photostability and near‐unity emission efficiency through interfacial coupling between inorganic and organic components.