Abstract:
Low photoluminescence (PL) quantum yield of molybdenum disulfide (MoS
2) quantum dots (QDs) has limited practical application as potential fluorescent materials. Here, we report the intercalation of aluminum ion (Al
3+) to enhance the PL of MoS
2 QDs and the underlying mechanism. With detailed characterization and exciton dynamics study, we suggest that additional surface states including new emission centers have been effectively introduced to MoS
2 QDs by the Al
3+ intercalation. The synergy of new radiative pathway for exciton recombination and the passivation of non-radiative surface traps is responsible for the enhanced fluorescence of MoS
2 QDs. Our findings demonstrate an efficient strategy to improve the optical properties of MoS
2 QDs and are important for understanding the regulation effect of surface states on the emission of two dimensional sulfide QDs.