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

The encapsulation of perovskite quantum dots (PQDs) inmetal-organicframeworks (MOF) has emerged as a promising strategy to improve theirenvironmental stability and tune their optical property. Althoughenergy or charge transfer processes between PQDs and the MOF matrixhave already been reported, the triplet-energy transfer (TET) processfrom MOF to PQD, which is useful for applications such as photon upconversionand photoredox catalysis, still remains unexplored. Herein, we encapsulatedCH(3)NH(3)Pb-(Br/I)(3) PQDs (MAPb-(Br/I)(3)) into a zinc isophthalate MOF (denoted as Y346) to constructa solid hybrid composite (PQDs@Y346). Compared with traditional colloidPQDs, the photostability of PQDs in PQDs@Y346 is enhanced by abouthundreds of times due to the protection of Y346 skeleton, accompaniedwith a prominent photoinduced self-healing behavior. Furthermore,a slow but efficient (similar to 57.8%) Y346-to-PQDs TET process is observedin PQDs@Y346 composites, leading to a long-lived (similar to 3 ms) delayedemission from PQDs. Our findings suggest PQDs@Y346 composites holdgreat promise for future long-term optoelectronic and photochemicalapplications.

Automated summary

The encapsulation of perovskite quantum dots (PQDs) in metal-organic frameworks (MOF) improves their environmental stability and optical property. In this study, CH(3)NH(3)Pb-(Br/I)(3) PQDs were encapsulated in a zinc isophthalate MOF to construct a solid hybrid composite (PQDs@Y346). The PQDs@Y346 composites exhibited enhanced photostability and a long-lived delayed emission from PQDs due to a Y346-to-PQDs triplet-energy transfer process.