Perovskite‐Initiated Photopolymerization for Singly Dispersed Luminescent Nanocomposites

Abstract

Metal halide perovskites have demonstrated rich photophysics and remarkable potential in photovoltaic and electroluminescent devices. However, the photoactivity of perovskite semiconductors in chemical processes remains relatively unexplored. Here, a general approach toward the synthesis of luminescent perovskite-polymer nanocomposites is reported, whereby perovskite nanocrystals are used as photoinitiators in the polymerization of vinyl monomers. The white-light illumination of a perovskite-monomer mixture triggers a free-radical chain-growth polymerization process, giving rise to high molecular weight polymers of ≈200 kDa. The in situ growth of polymer chains from the perovskite crystal surface allows the formation of individually dispersed nanocrystal cores within an encapsulating polymer matrix, and leads to a significant threefold enhancement in photoluminescence quantum yield. This photoluminescence enhancement is attributed to the spatial separation of the perovskite nanocrystals and hence the deactivation of energy transfer to dark crystals. The resulting perovskite-polymer nanocomposites exhibit excellent stability against moisture and are shown to be useful as functional downconversion phosphor films for luminescent displays and lighting.

Near-infrared light-responsive hydrogels via peroxide-decorated MXene-initiated polymerization

“…Gelation is observed at a high concentration of the monomer. In view of the widespread use of inorganic semiconductor nanoparticles (such as V 2 C, perovskite nanocrystals, graphitic carbon nitride, TiO 2 nanoparticles, and titania nanosheets) as photo-catalysts in polymerization, [40][41][42][43][44][45] it is surprising to observe this rapid p-Ti 3 C 2 T x -initiated polymerization in the absence of light illumination.…”

Epitaxial Growth of CsPbX3 (X = Cl, Br, I) Perovskite Quantum Dots via Surface Chemical Conversion of Cs2GeF6 Double Perovskites: A Novel Strategy for the Formation of Leadless Hybrid Perovskite Phosphors with Enhanced Stability

“…Improving the stability of LHPs is currently the main strategy for overcoming the abovementioned obstacles. To date, many efforts have been devoted to this endeavor, including polymer or inorganic oxide (SiO 2 , TiO 2 , Al 2 O 3 ) encapsulation, embedding of QDs into mesoporous materials, and construction of protective shells for QDs . Although the decomposition of LHPs can be mitigated, the thick matrix does not contribute to the luminescence, so the device performance will inevitably be affected .…”

Recent Progress in Engineering Metal Halide Perovskites for Efficient Visible‐Light‐Driven Photocatalysis

“…In 2018, the group of Tan reported the photocatalytic polymerization of polystyrene (PS) by using CsPbBr 3 NCs as a photoinitiator . This polymerization reaction induced the formation of PS‐encapsulated CsPbBr 3 matrix, which exhibited excellent moisture tolerance and PLQY.…”