Polymer Zwitterions for Stabilization of CsPbBr₃ Perovskite Nanoparticles and Nanocomposite Films

Abstract

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Modulating photoelectron localization degree to achieve controllable photoluminescence quenching and activation of 0D hybrid antimony perovskites

“…Benefitting from the adequate dispersion effect in these matrix materials, the PQDs acting as fluorescence species are highly confined and the ACQ effect is significantly diminished, giving rise to stable PL performance. 5–17 However, these complicated and time-consuming modulation strategies readily destroy the PQD structure, decrease the production yield, sacrifice the luminescent efficiency, and are incapable of fundamentally preventing the ACQ effect and luminescent quenching. Therefore, it is significant and imperative to explore more favorable assembly approaches and prepare new kinds of perovskite materials with highly efficient and stable photoluminescence (PL) performance via a rational structural design strategy from the molecular level.…”

Zwitterionic Block Copolymers for the Synthesis and Stabilization of Perovskite Nanocrystals

“…Control experiments performed without added ligand, or conducted with PBMA homopolymer, failed to produce high quality PNCs, instead yielding large quantities of aggregates (Figure S10) and poorly dispersible solids with poor colloidal stability such that accurate size and PLQY determination is not possible. While changing the polymer to a random microstructure, i.e., PBMA‐ r ‐PSBMA, would be an insightful control experiment, these random copolymers are insoluble in hot mesitylene even at low zwitterion content (≥ 2 mol% SB), such that their use as ligands for PNCs requires an additional ligand exchange step [10] …”

“…[9] Our group embedded PNCs into random copolymers containing pendant zwitterions, combining the film-forming and barrier properties of polymeric alkyl methacrylates with the strong, static ligandbinding of sulfobetaine (SB) and phosphorylcholine (PC) groups. [10] This afforded highly luminescent, well-dispersed, and optically transparent PNC-polymer nanocomposites, but was limited to polymers containing small amounts of zwitterion (i.e., < 5 mol%), above which the polymers did not dissolve in useful solvents for PNC growth. Nevertheless, it is increasingly evident that zwitterions, in the form of both polymers and small molecule surfactants, hold potential to hone the surface chemistry and stability of nanoscale perovskites and broaden their application range.…”

Surface modification strategy based on molecular engineering of an organic cation toward spectrally stable deep-blue emission perovskites

“…Research on all-inorganic perovskites (AIP) has now become the focus of many researchers, due to the advantages of high photoluminescence quantum yield (PLQY), 1 great color purity, 2 convenient emission color adjustment, 3 rich emission colors, 4 wide color gamut, 5 and good solution processing performance, 6 and have shown great application potential in lighting and display. 7,8 Among the three primary optical colors, the development level of red and green emission AIP has caught up with that of organic luminescence materials in just a few years.…”