Comprehensive Review on Stability of Quasi‐2D Perovskite LEDs: Mechanistic Insights Into Intrinsic/Extrinsic Degradation and Innovative Stabilization Strategies

Quasi-two-dimensional (quasi-2D) perovskite light-emitting diodes (PeLEDs) have gained a strong competitive edge in next-generation display, thanks to their exceptional electronic and optical properties. In recent years, the performance of quasi-2D PeLEDs has advanced steadily, with their external quantum efficiency (EQE) climbing to approximately 30%, highlighting immense development potential. However, the operational stability of these devices remains a critical bottleneck, severely limiting their commercialization. Consequently, this review focuses on the influencing factors and mechanisms governing the stability of quasi-2D perovskites. Centering on the stability of quasi-2D PeLEDs, we first systematically analyze the key stability-affecting factors from the dual dimensions of intrinsic and extrinsic causes. Subsequently, we summarize strategies for enhancing the stability of quasi-2D PeLEDs, including component regulation, additive regulation, phase distribution regulation, device structure regulation, process parameter regulation, and so on. Finally, we outline the challenges and opportunities currently faced in achieving stable quasi-2D PeLEDs, providing a clear direction for the development of high-performance, long-lifetime quasi-2D PeLEDs.