Study of different electron transporting layer on electroluminescent properties of perovskite light emitting diodes

Organic-inorganic hybrid perovskites have been emerging as promising emitting materials for light-emitting diodes due to their miraculous optoelectronic properties. Conventional electron transporting materials used in organic light emitting diodes (OLEDs) such as 1,3,5-tris(2-N-phenylbenzimidazolyl) benzene (TPBi), 4,7-diphenyl-1,10-phenanthroline (Bphen), 1,3,5-tri(m-pyrid-3-yl-phenyl) benzene (TmPyPB), and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) have been used as electron transporting layer (ETL) in the perovskite light emitting diodes (PeLEDs). However, there exit few systematic analysis about different ETL materials on the performance of PeLED. In this work, we employ TPBi, BPhen, TmPyPB, and BCP as ETL material of PeLED, respectively. Owing to the high electron mobility and suitable energy level, BPhen PeLED express the best performance at the same thickness with a maximum luminance of 812 cd m² and current efficiency (CE) of 0.1 cd A^-1. Hence, this work provides a useful method on device architecture construction for the realization of high performance PeLEDs.