 Quasi-2D parafskite LEDs, pyrrolides, have been widely investigated due to their high efficiency and low cost. However, the heterogeneous nature of these materials has limited their applications. In this study, researchers discovered that a series of molecules containing phosphoryl chloride functional groups can significantly improve the performance of these LEDs. Specifically, they found that the bis-2-oxo-3-oxazolidonyl, phosphinochloride, biopcl, can regulate the phase distribution by reducing the crystallization rate and passivate the defects, resulting in highly efficient and reproducible pyrrolides. This study demonstrates the potential of using biopcl to improve the performance of Quasi-2D parafskite LEDs. This article was authored by Mingliang Li, Yaping Zhao, Jiogua, and others.