Optimizing Printed Quasi‐2D Luminescent Perovskite Films via Delaminated Metal–Organic Framework Modulation

Microelectronic printing technology has recently emerged as a key approach in advancing pixel-array perovskite films, particularly quasi-2D perovskite films, to meet current scientific and technological demands. However, its further development remains hindered by the uncontrollable crystallization of perovskite during the printing process. Herein, a novel in situ heterogeneous nucleation growth approach for obtaining quasi-2D perovskite films is demonstrated, utilizing delaminated metal-organic frameworks (i.e., layered Cd-MOF) with an ordered structure as modulators. The inosculation of phenylethylammonium (PEA⁺) with layered Cd-MOF serves as crystal nuclei, facilitating heterogeneous crystal nucleation and growth while regulating the distribution of the n-phase. Moreover, the intercalation of the layered Cd-MOF alleviates rigid stress, thereby eliminating defects in the printed films. The resulting quasi-2D perovskite films exhibit an impressive photoluminescence quantum yield of 37.40% along with exceptional luminescent stability, making them promising candidates for various optoelectronic applications. Overall, this study highlights the significant potential of MOF-assisted synthesis in advancing high-performance perovskite materials through microelectronic printing technology, offering a promising pathway for the development of future optoelectronic devices.