The organic-inorganic hybrid perovskite materials have been interested because of their outstanding electrical and optical characteristics, which enables a remarkable enhancement of device efficiency. However, high-quality perovskite nanocrystal films are required to realize highly efficient and stable perovskite LEDs. Here, we demonstrate the current strategies involved in the morphological control of perovskite films to improve the device performance and long-term stability of PeLEDs via perovskite film modification, interface engineering, and self-organized multiple quantum wells (quasi 2D-perovskite).