Solid-state ligand exchange of perovskite nanocrystals in film using Conjugated polyelectrolytes.
발표자
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초록
내용
A long aliphatic ligand used in perovskite nanocrystal synthesis, acts as insulator in perovskite LEDs (PeLEDs). Ligand engineering was studied to improve charge transfer and we introduced cationic conjugated polyelectrolytes (CPEs) as a ligand. it can be expected to improve color tuning ability and stability with a hydrophobic conjugated backbone. Therefore, we conduct a solid-state ligand exchange in film due to aggregation in solution-state. We used Acetate solution to prevent polar solvent and poly(triphenylamine-co-fluorene) based cationic CPE (TPAFA7-I) for ligand exchange. After ligand exchange, red shifted peak was confirmed due to using Iodide through photoluminescence (PL) spectroscopy. In addition, poly(fluorene-co-phenylene) based cationic CPE (MP2I) was also used to compare with TPAFA7-I. Detailed optical properties depending on the CPE treatment will be discussed.