Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Lead halide perovskites nanocrystals (LHP-NCs) have recently emerged as promising materials for a wide range of applications, including energy harvesting, artificial lighting, displays, as well as bright scintillators. However, the long-term stability issues together with poor processability associated with LHP-NCs have limited their applicability and commercialization. The integration of perovskite nanocrystals into polymer matrices has emerged as a valuable solution, although some challenges remain in achieving optical-grade LHP-NCs/polymer nanocomposites, notably in terms of low conversion yields, low LHP-NCs loadings and minimization of lead-containing wastes. In the current study, we report a novel protocol for the one-pot single step synthesis of bulk LHP-NCs/poly(methyl methacrylate) nanocomposites via perovskite-initiated PET-RAFT (Photoinduced Electron Transfer-Reversible Addition-Fragmentation Chain Transfer) technique. Remarkably, the polymerization of methyl methacrylate achieved nearly 90% monomer conversion under blue light and in the presence of oxygen. The polymerization initiation, mediated by the photocatalyst surface, allows for the production of highly homogeneous nanocomposites with high CsPbBr3 loading (up to 7 wt%), still maintaining high monomer conversion. Moreover, the polymerization was shown to positively homogenize the NCs size and passivate the surface defects, resulting in improved luminescent efficiency (PLQY up to 90%). Finally, this research offers valuable mechanistic insights into both the polymerization mechanism and the nanocrystals behavior during nanocomposite formation.
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