Joo Sung Kim1,Jung-Min Heo1,Gyeong-Su Park1,Seung-Je Woo1,Changsoon Cho2,Hyung Joong Yun3,Dong-Hyeok Kim1,Jinwoo Park1,Seung-Chul Lee1,Sang-Hwan Park1,Eojin Yoon1,Neil Greenham2,Tae-Woo Lee1
Seoul National University1,University of Cambridge2,Korea Basic Science Institute3
Joo Sung Kim1,Jung-Min Heo1,Gyeong-Su Park1,Seung-Je Woo1,Changsoon Cho2,Hyung Joong Yun3,Dong-Hyeok Kim1,Jinwoo Park1,Seung-Chul Lee1,Sang-Hwan Park1,Eojin Yoon1,Neil Greenham2,Tae-Woo Lee1
Seoul National University1,University of Cambridge2,Korea Basic Science Institute3
Metal halide perovskites are attracting great attention as next-generation light-emitting materials due to their excellent emission properties with narrowband emission. However, perovskite light-emitting diodes (PeLEDs) irrespective of their material types (polycrystalline film or nanocrystals) have not realized high luminance, high efficiency, and long lifetime simultaneously, as they are influenced by the intrinsic limitations related to the trade-off properties between charge transport and confinement in each type of perovskite materials. Here, we report bright, efficient, and stable PeLEDs made of core/shell perovskite nanocrystals obtained using a simple <i>in-situ</i> reaction. The ligand passivates the surface defect states, and thereby greatly reduces trap density in films while maintaining good charge-transport properties. Our work sheds great light on the possibility that PeLEDs can be commercialized in the future display industry.