Enhanced blue photoluminescence and photostability of Cs3Bi2Br9 perovskite quantum dots via surface passivation with silver ions

A facile and effective method is demonstrated to prepare highly stable Ag–Cs 3 Bi 2 Br 9 QDs. The PLQY of Cs 3 Bi 2 Br 9 QDs has been enhanced to 34.2% via passivation of Ag ions, and the PL intensity is still about 90% under 80 min UV irradiation.