Room Temperature In-Situ Synthesis of Inorganic Lead Halide Perovskite Nanocrystals Sol Using Ultraviolet Polymerized Acrylic Monomers as Solvent and Their Composites with High Stability  
[PERSON]  
1 Institute of Inorganic Materials, East China University of Science and Technology, Shanghai 200237, China; [EMAIL_ADDRESS] (L.Z. ); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (L.C. ); [EMAIL_ADDRESS] (C.L. ); [EMAIL_ADDRESS] (H.T. ); [EMAIL_ADDRESS] (H.Z. ); [EMAIL_ADDRESS] (Q.C.) 2  
Jun [PERSON] [PERSON] [PERSON]  
[PERSON]  
and [PERSON]  
1 Institute of Inorganic Materials, East China University of Science and Technology, Shanghai 200237, China; [EMAIL_ADDRESS] (L.Z. ); [EMAIL_ADDRESS] (J.C.); [EMAIL_ADDRESS] (L.C. ); [EMAIL_ADDRESS] (C.L. ); [EMAIL_ADDRESS] (H.T. ); [EMAIL_ADDRESS] (H.Z. ); [EMAIL_ADDRESS] (Q.C.) 2  
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dissolve Cs, Pb and halogen precursors. To solve this problem, many researchers have devoted time to exploring an eco-friendly and cost-effective strategy, such as aqueous or alcohol synthesis [23; 24; 25; 26; 27]. Recently, [PERSON] et al. firstly achieved direct synthesis of CsPbBr\({}_{3}\) nanorods via tip ultrasonication by using a series of short chain alcohols, except for ethanol [28], offering a novel synthetic strategy in polar solvent. Nevertheless, this strategy still needs post-synthesis treatment and redispersion in toluene. Many efforts have been devoted into the color-conversion perovskite nanocrystals-polymer composite film applied in liquid crystal display backlight in recent years. One typical strategy is to blend perovskite nanocrystals sols synthesized via different approaches with polymer, then the composite film can be obtained by solvent volatilization. The mixing of perovskite nanocrystals with polymers often causes a predictable agglomeration of nanocrystals, due to the large difference in polarity between perovskite nanocrystals and polymers [29]. To avoid the aggregation of perovskite nanocrystals in polymers, an in-situ synthetic strategy, which firstly adopts an appropriate solvent to dissolve Cs, Pb, Br sources and polymer, and then follows a solvent volatilization process, has been reported [14; 30]. For instance, [PERSON] et al. reported an in-situ synthesis of perovskite nanocrystals-polyvinylidene fluoride (PVDF) composite film by employing DMF as solvent of CsBr, PbBr\({}_{2}\) and PVDF [14]. [PERSON] et al. realized an in-situ large-scale continuous production of PNCs embedded in polymethyl methacrylate (PMMA) via microfluidic spinning microreactors, by using chloroform as solvent and Cs-oleate, Pb-oleate and tetraoctylammonium bromide as precursors [30]. [PERSON] et al. developed an in situ polymer swelling/deswelling strategy to fabricate MAPbBrs/polystyrene and MAPbBrs/polycarbonate composite films [31]. Moreover, these hydrophobic polymers tend to form a coherent barrier layer around perovskite nanocrystals, remarkably enhancing the stability of perovskite nanocrystals against moisture and oxygen. However, these approaches still inevitably employ eco-unfriendly solvent. Recently, [PERSON] et al. developed a modified hot-injection synthesis of CsPbBr\({}_{3}\) nanocrystals by using ultraviolet (UV)-polymerizable lauryl methacrylate (LMA) as a solvent, which effectively diminished the use of consumptive solvent, opening a new window to synthesize CsPbX\({}_{3}\) polymer composite films [29]. Regretfully, this strategy still needs high reaction temperature (180 \({}^{\circ}\)C) and an ice bath to terminate the reaction. Herein, we developed a facile in-situ one-pot synthesis of CsPbX\({}_{3}\) nanocrystals using acrylic monomer as solvent at room temperature.