[OLED3] OLED Display

[OLED3-6L] Significance of Energy-Level Alignment in 3D Perovskite ELs Significance of Energy-Level Alignment in 3D Perovskite ELs

*KIHYUNG SIM¹, HAYATO KAMIOKA², JUNGHWAN KIM¹, HIDEO HOSONO¹ (1. Materials Research Center for Element Strategy, Tokyo Institute of Technology, (Japan), 2. Department of Physics, College of Humanities and Sciences, Nihon University (Japan))

Keywords:Metal Halide Perovskite, Perovskite light-emitting diode (PeLED), Electron Transport layer (ETL), Exciton Confinement Effect, Charge Balance

In this study, we report a significant phenomenon that EL performances for 3D materials, such as CsPbX₃, are governed by adjacent charge transport layers, which is possibly due to nonradiative recombination resulting from the small exciton binding energy. To overcome this issue, we developed a new electron transport layer (ETL) that enhances exciton confinement effect in 3D CsPbX₃. Consequently, we achieved ultra-high brightness of 500,000 cd/m² at a very small operating voltage of 5V.