Lead-free, stable, high-efficiency (52%) blue luminescent FA3Bi2Br9 perovskite quantum dots

Lead-free Bi-based perovskite FA₃Bi₂X₉ (X = Cl, Br, and I) quantum dots (QDs) are synthesized for the first time at room temperature. The ligand-passivated FA₃Bi₂Br₉ QDs exhibit blue emission at 437 nm with photoluminescence quantum yield (PLQY) up to 52%.