Luminescent Dynamics of Perovskite Quantum Dots Encapsulated in Metal–Organic Frameworks

Abstract

The encapsulation of perovskite quantum dots (PQDs) in metal–organic frameworks (MOF) has emerged as a promising strategy to improve their environmental stability and tune their optical property. Although energy or charge transfer processes between PQDs and the MOF matrix have already been reported, the triplet-energy transfer (TET) process from MOF to PQD, which is useful for applications such as photon upconversion and photoredox catalysis, still remains unexplored. Herein, we encapsulated CH3NH3Pb(Br/I)3 PQDs (MAPb(Br/I)3) into a zinc isophthalate MOF (denoted as Y346) to construct a solid hybrid composite (PQDs@Y346). Compared with traditional colloid PQDs, the photostability of PQDs in PQDs@Y346 is enhanced by about hundreds of times due to the protection of Y346 skeleton, accompanied with a prominent photoinduced self-healing behavior. Furthermore, a slow but efficient (∼57.8%) Y346-to-PQDs TET process is observed in PQDs@Y346 composites, leading to a long-lived (∼3 ms) delayed emission from PQDs. Our findings suggest PQDs@Y346 composites hold great promise for future long-term optoelectronic and photochemical applications.