Enhanced stability and confinement effects of Cs4PbBr6 quantum dots via mechanochemical immobilization on MOF nodes.

Mechanochemical has emerged as an eco-friendly, efficient, and upscalable tool for the synthesis of perovskite quantum dots (PQDs). However, achieving control over the size and ensuring good mono-dispersion of PQDs by mechanochemistry, while simultaneously increasing their stability remains a great challenge. Herein, we specifically chose a lead bromine-based MOF (PbBr-MOF) with [Pb 2 Br 3 ]+ nodes and utilized the uniform distribution of [Pb 2 Br 3 ]+ to induce the in-situ confined growth of Cs 4 PbBr 6 QDs via bottom-up mechanochemical approach for the first time, denoted as Cs 4 PbBr 6 @PbBr-MOF. The Cs 4 PbBr 6 QDs uniform and firmly anchor in PbBr-MOF through [Pb 2 Br 3 ]+ nodes, preventing their aggregation and enhancing quantum confinement effects. Highly dispersed Cs 4 PbBr 6 QDs (3.86 ± 0.61 nm) exhibit high photoluminescence quantum yield (31%) and notable durability in various solvents. Furthermore, Cs 4 PbBr 6 @PbBr-MOF demonstrates excellent performance as a temperature sensor, with maximum absolute (Sa) and relative (Sr) temperature sensitivities of up to 0.013 K−1 and 3.41% K−1, respectively. [Display omitted] • [Pb 2 Br 3 ]+ nodes in PbBr-MOF as Cs 4 PbBr 6 QDs precursors. • Enhancing Cs 4 PbBr 6 's confinement effect through controlled CsBr and nodes dispersion. • Cs 4 PbBr 6 QDs have 3.86 ± 0.61 nm size with high photoluminescence yield (31%). • PbBr-MOF boosts Cs 4 PbBr 6 QDs stability in harsh conditions. • Cs 4 PbBr 6 @PbBr-MOF shows impressive temp sensitivity. [ABSTRACT FROM AUTHOR]