Large Organic Cations in Quasi-2D Perovskites for High-Performance Light-Emitting Diodes

Quasi-two-dimensional (quasi-2D) layered perovskites have received considerable attention because of their potential for high-performance perovskite optoelectronics. Among them, chemical modifications of large organic cations provide great opportunities to control the morphology, defect density, and stability of perovskite films. This Perspective mainly focuses on the design of large organic cations in quasi-2D perovskites and their effects on the performance of light-emitting diodes (LEDs). Potential candidates and challenges of large organic cations for high-performance perovskite LEDs are also discussed.