Recent Advances in Spin‐LEDs Based on Chiral Nanomaterials: Bridging Fundamental Physics, Materials, and Devices Performance

Abstract Spin light‐emitting diodes (Spin‐LEDs) can directly generate circularly polarized luminescence (CPL) at room temperature without external magnetic fields, offering promising applications in quantum communication, 3D displays, and biomedical imaging. Recent advances in chiral nanomaterials, particularly chiral perovskites, chiral colloidal quantum dots (QDs), and chiral metal–organic frameworks (CMOFs), have significantly improved device performance through the chirality‐induced spin selectivity (CISS) effect. This review systematically examines the fundamental mechanisms of CPL generation, including spin–orbit coupling, band splitting, and optical selection rules in chiral materials. Recent developments in material design strategies are analyzed, from low‐dimensional chiral perovskites to surface‐modified colloidal QDs, and emerging CMOFs with tunable pore structures, and their applications in integrated and separated chiral‐emissive layer device architectures. Current Spin‐LEDs have achieved external quantum efficiency (EQE) over 22%, and the circularly polarized electroluminescence dissymmetry factors ( g _CP‐EL ) have reached the level of 10 ⁻¹ . However, challenges remain in understanding spin relaxation mechanisms, balancing luminescence efficiency and polarization, and improving material stability. This review summarizes the relevant physical mechanisms, material and device optimization strategies, and explores the potential trends for advancing high‐performance Spin‐LEDs in practical optoelectronic applications.