Polarized luminescence in halide perovskite nanocrystals: from fundamental microscopic mechanisms to advanced optoelectronic applications.

Polarized luminescent perovskite nanocrystals (PNCs) have emerged as promising optoelectronic materials due to their high photoluminescence quantum yield, narrow emission linewidth, and excellent structural tunability. Benefiting from unique structural anisotropy, chiral ligand modulation and stimulus responsiveness, PNCs enable efficient linear and circular polarized luminescence. This review systematically elaborates the intrinsic mechanisms of PNC-based polarized emission, summarizes advanced macroscopic assembly and structural engineering strategies for stabilizing film state polarized luminescence, and outlines state-of-the-art applications in optoelectronic devices, encryption and spintronics. The current bottlenecks and future development perspectives are also proposed, aiming to promote the advancement of polarized perovskite optoelectronics.