Bright and recoverably stable green emission of (Et2NH)PbBr3 perovskite nanocrystals encapsulated within metal organic framework

To advance the development of optoelectronic structures, it is essential to design novel compositions of luminescent metal halide perovskite nanocrystals (PNCs), which are at the forefront of current research endeavors. This study addresses the instability issues associated with PNCs by utilizing metal-organic frameworks (MOFs). A straightforward methodology is successfully proposed for the synthesis of (Et₂NH)PbBr₃@Uio-67 composites, involving the separate formation of the organic salt (Et₂)NHBr and PbBr₂-MOFs. Subsequently, (Et₂)NHBr in methanol is introduced to PbBr₂@Uio-67 in toluene to yield a final composite comprising nanoscale PNCs embedded within the MOF matrix. The resulting samples exhibit a bright green emission at approximately 536 nm, with a narrow full width at half maximum (FWHM) of 20 nm and an emission quantum yield of 51.4 %. The porosity of the composite was characterized using Brunauer–Emmett–Teller (BET) measurements, revealing pore diameters ranging from 3.5 to 3.9 nm. Emission decay profiles were well-fitted to a biexponential function, indicating an average lifetime of 17.6 ns. The enhanced stability of the composite was demonstrated through prolonged storage, UV-irradiation, and thermal treatment, confirming the effective passivating role of Uio-67, which maintained recoverable emission even at elevated temperatures (140 °C) with no change in emission wavelength. The simplicity and versatility of the reaction method, conducted at low temperatures without the need for an inert atmosphere, combined with the strong and pure green emission and significant durability under harsh conditions, position the fabricated nanocomposite as a promising candidate for light panel display applications.