Methylammonium lead bromide perovskite (MAPbBr 3 ) quantum dots (QDs) have emerged as promising candidates for next-generation optoelectronic applications owing to their exceptional photoluminescent properties. However, their practical applications face significant challenges due to inherent instability issues. Herein, a solvent-induced in situ crystallization method is presented to encapsulate MAPbBr 3 QDs within a crosslinked (cl-) polymethyl methacrylate (PMMA) network. This innovative approach eliminates environmental concerns associated with traditional solvent evaporation methods while enabling uniform dispersion and stabilization of perovskite QDs within the crosslinked polymer matrix. The effects of preparation conditions are systematically investigated on the optical performance of the composite materials. Notably, UV irradiation is found to significantly enhance the luminescent performance. The optimized MAPbBr 3 @cl-PMMA exhibits outstanding optoelectronic performance, featuring a narrow emission profile (full width at half maximum: 24.6 nm), high optical transmittance (91%), and an impressive photoluminescence quantum yield of 98.3%. Benefiting from the protective crosslinked polymer matrix, the composite demonstrates exceptional stability. Furthermore, by integrating MAPbBr 3 @cl-PMMA film with commercial K 2 SiF 6 :Mn 4+ (KSF) red phosphor, a liquid crystal display (LCD) backlight device achieving a wide color gamut of 122.7% National Television System Committee (NTSC) 1953 standard is fabricated. This environmentally friendly and scalable synthesis method offers a promising pathway for large-area manufacturing and practical optoelectronic applications.
While the metal halide perovskite materials are emerging as potentially promising photocatalysts, they still suffer from the intrinsic instability, seriously hampering their further practical applications. In this study, a perovskite-based composite with a sandwich structure is first established to realize the encapsulation of individual octylamine-capped MAPbBr 3 (OM-PE) quantum dots (QDs), and the Zeolitic Imidazolate Framework-67 (ZIF-67) isolates the individual OM-PE@PbBrOH QDs (2 nm) to preserve their unique optoelectronic properties while preventing degradation from environmental factors. The resulting sandwich composite was proved to be a staggered-gap heterostructure with a p–n junction, in which the PbBrOH layer acted as a water-resisting covering and ZIF-67 layer promoted the electron mobility. Benefiting from the chemical interactions and interfacial charge dynamics among the different layers, the OM-PE@PbBrOH ⊂ ZIF-67 composite exhibited the superior stability in water for two months, and presented an enhanced photodegradation efficiency of organic dyes (malachite green, methylene blue and rhodamine B), which is around 24 times higher than that of pristine perovskite. By integrating the respective merits of each component, this work unprecedentedly constructs the 2 nm sandwich-like OM-PE@PbBrOH ⊂ ZIF-67 composite, and opens new avenues for stable, efficient, and multifunctional photocatalytic systems, with potential applications beyond wastewater treatment.
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