In-situ growth of inorganic perovskite quantum dots in MOF-5: significantly enhanced luminous intensity and stability

A composite luminescent material consisting of perovskite quantum dots (PQDs) and MOF-5 using an in-situ growth method. The preparation of MOF-5 as a growth template was achieved via hydrothermal synthesis, with the addition of CTAB/TMB as a stencil agent to facilitate the formation of pores with an appropriate size. Subsequently, CsPbBr3 QDs were grown in situ on the MOF under mechanical grinding conditions. The prepared CsPbBr3@MOF-5 composite materials were characterized by various analytical techniques including BET, XRD, PL, TEM, SEM, and EDS. The results revealed that the average size of PQDs was only 4.9 nm, and the corresponding emission peak exhibited a blue shift of 11 nm. The photoluminescence intensity (PL) of CsPbBr3@MOF-5 was increased by 71% compared to the unmodified sample, and photoluminescence quantum yield (PLQY) of solid powder increased to 48%. This is due to the fact that MOF-5 reduces the surface defects of quantum dots. Additionally, the Significantly improved PQDs stability after compounding MOF, both at room temperature and under thermal stress. These findings highlight the potential of this synthetic strategy as a means of preparing ultra-small composite light-emitting materials, with promising applications in LED and optoelectronic devices.