Perovskite Nanocrystals Initiate One‐Step Oxygen Tolerant PET‐RAFT Polymerization of Highly Loaded, Efficient Plastic Nanocomposites

Lead halide perovskite nanocrystals (LHP-NCs) incorporated within polymermatrices have emerged as promising materials for various photonic applica-tions. However, challenges persist in achieving high-quality nanocompositesdue to low monomer conversion yields, restricted LHP-NCs loadings, anddifficulty in maintaining NCs integrity post-polymerization. A novel protocolfor synthesizing LHP-NCs/poly(methyl methacrylate) nanocompositesin a single step via the NC-initiated photoinduced electron transfer-reversibleaddition-fragmentation chain transfer (PET-RAFT) method is presented. Poly-merization initiation mediated by NCs surfaces under blue light enables thefabrication of homogeneous nanocomposites with NCs loadings up to 7% w/wand ≈90% monomer conversion even in the presence of oxygen. This processpreserves the optical quality of the NCs and passivates NCs surface defects,resulting in nanocomposites exhibiting near unity luminescence efficiencies.The potential of this approach for producing highly loaded nanocompositesfor radiation detection is validated by radioluminescence measurementsshowing light yield values of 6000 ph MeV−1 and fast scintillation dynamicswith effective lifetime of 490 ps, showing promise for time-of-flight radiometry.