摘要 : Cesium lead iodide（CSPM3)perovskite nanocrystals（NCs)have received widespread attention in light-emitting diodes（LEDs),solar cells,and photodetectors（PDs)for their high thermal stability resulting from all-inorganic components... 展开 Cesium lead iodide（CSPM3)perovskite nanocrystals（NCs)have received widespread attention in light-emitting diodes（LEDs),solar cells,and photodetectors（PDs)for their high thermal stability resulting from all-inorganic components.However,the facile room-temperature synthesis of perovskite-phase CSPM3 NCs remains a major challenge because of the thermal unequilibrium-induced metastable（black)to stable（yellow)phase transition.Here,we proposed a ligand-mediated strategy to synthesize γ-phase CsPbI3 perovskite NCs in non-polar solvent at room temperature for the first time.We found that the introduction of 4-dodecylben-zenesulfonic acid（DBSA)ligand could prevent CsPbI3 changing from the y phase to the 5 phase,which was attributed to the strong bonding and steric hindrance that suppressed the distortion of the corner-sharing octahedron.The as-synthesized CsPbI3 perovskite NCs were well-dispersed in organic solvents（such as toluene and hexane),which could serve as inks to construct the active layer for solution-processed optoelectronic devices（The PD with an on/off ratio of 200,and the LED showing an external quantum efficiency（EQE)approaching 6%).The proposed method showed superior universality as evidenced by the successful synthesis of efficient red-greenblue CsPbX3 NCs（the EQEs were 8.6%,14.7%,and 3.4% for red,green,and blue LEDs,respectively).The results demonstrated that the room-temperature synthesis could avoid the tediousness of typical hot-injection at high temperatures and this method could be widely applied to various optoelectronic devices. 收起