Rodolphe Valleix, William Zhang, Abraham J Jordan, Lilian Guillemeney, Leslie G Castro, Bereket L Zekarias, Sungho V Park, Oliver Wang, Jonathan S Owen
Quantum dots (QDs) with metal fluoride surface ligands were prepared via reaction with anhydrous oleylammonium fluoride. Carboxylate terminated II-VI QDs underwent carboxylate for fluoride exchange, while InP QDs underwent photochemical acidolysis yielding oleylamine, PH3 , and InF3 . The final photoluminescence quantum yield (PLQY) reached 83% for InP and near unity for core-shell QDs. Core-only CdS QDs showed dramatic improvements in PLQY, but only after exposure to air. Following etching, the InP QDs were bound by oleylamine ligands that were characterized by the frequency and breadth of the corresponding ν(N-H) bands in the infrared absorption spectrum...
May 7, 2024: Nano Letters