Metal halide perovskite nanocrystals (PeNCs) are emerging as pivotal luminescent nanomaterials for optoelectronic applications. However, their inherent instability presents a significant challenge that must be addressed to advance the commercialization of related devices. This study proposes a straightforward and low-temperature preparation of hybrid organic-inorganic PeNCs, which are subsequently embedded within porous metal-organic frameworks (MOFs) to enhance their emission stability. We specifically focus on the synthesis of the rarely prepared DEAPbBr3(/BrI2)@MOF-5, that are (CH3CH2)2NH2PbBr3(/BrI2)@MOF-5 (diethylammonium lead bromide/iodide@MOFs) composites with bright and pure emissions at 518 nm (green) and 669 nm (red). The resulting composites demonstrated narrow emission spectra with robust and tunable photoluminescence emission, achieving emission efficiencies of up to 57.3 % in both colloidal and powder forms (even after integration with PDMS polymer to create luminescent composite films). Decay dynamic measurements indicated a binary recombination pathway with average excited-state lifetimes of approximately 15–18 ns. Notably, both green and red-emitting nanocomposites exhibit remarkable thermal stability at elevated temperatures (up to 200 °C) and maintain their properties during prolonged storage under laboratory conditions. Consequently, these engineered nanocomposites dispersed in polymer represent promising candidates for the development of display pixels.
