Long-Range Exciton Transport in Perovskite–Metal Organic Framework Solid Composites
Qi Sun, Zixi Yin, Shiping Wang, Chunyi Zhao, Jing Leng, Wenming Tian, Shengye Jin
Abstract
The encapsulation of perovskite quantum dots (PQDs) in metal organic frameworks (MOFs) is a promising strategy for fabricating stable and functional perovskite solid composites (denoted as PQDs@MOF), which have exhibited great potential for optoelectronics, catalysis, and luminesce applications. However, the exciton diffusion distance, one of the key factors determining the performance of PQDs@MOF in these applications, remains unknown. Herein, by using time-resolved and photoluminescence-scanned imaging microscopy, we report the observation of long-distance exciton transport (278 ± 12.6 nm) and high diffusion coefficient (0.0428 ± 0.0039 cm2/s) in MAPbBr3 PQDs@MOF microcrystals. We show that the long exciton diffusion length, which is seven times longer than that in colloid MAPbBr3 PQD solid films, can be attributed to the strong dipole–dipole coupling between adjacent PQDs embedded in the MOF matrix and their long carrier lifetimes. These findings demonstrate the great potential of PQDs@MOF crystals for optoelectronic applications.