| 초록 |
Recently, all-inorganic perovskite quantum dots (PeQDs) have become attractive owing to their excellent optoelectronic properties. To enable the use of CsPbX3 PeQDs for quantum dot LEDs (PeQLEDs), a paradox associated with the ligand property and surface passivation must be overcome. A decline in the photoemission performance was observed at relatively low amounts of the surface-passivating ligands, while the quality of the thin film deteriorated in the presence of excessive ligands. To address this conflict, the performance of PeQLEDs based on CsPbX3 fabricated by a solid-state ligand exchange (SLE) was investigated. We discovered that an optimal aromatic acid/amine ligand is required for CsPbX3-based PeQLEDs to retain the solubility of the PeQDs and simultaneously accomplish the SLE process without affecting the properties of the PeQD. Moreover, an improvement in the overall photoemission efficiency of the resulting PeQLED device was confirmed under red, green, and blue conditions. |
