| 초록 |
Cesium lead halide perovskite nanocrystals (CsPbX3) are gaining interest due to their brighter and narrower emission and facile color tunability. However, most CsPbX3 NCs-based light-emitting diodes (LEDs) suffer from inferior stability and nonideal efficiency even until now. Considering ionic characteristics of CsPbX3 NCs and highly dynamic interplay between ligands and NCs, proper strategy is required for optimized LED performances. Herein, we propose organic pseudohalide ligand, didodecyldimethylammonium tetrafluoroborate (DDA-BF4) in order to achieve improved optical properties and device efficiencies. Post-treatment with DDA-BF4 ligands results in better photoluminescence quantum yield (PL QY) and PL lifetime, along with enhanced luminance and EQE of 2,697 cd/m2 and 12.19 %. Also, same strategy was applied to skyblue-emitting mixed halide PeNCs, suggesting universality of our post-treatment with novel pseudohalide-containing ligands. |
