Enhancing the Stability of CH3NH3PbBr3 Nanoparticles Using Double Hydrophobic Shells of SiO2 and Poly(vinylidene fluoride)

The instability of lead halide perovskites (LHPs) has tremendously hindered their practical applications. Although some examples on encapsulating LHPs into a SiO 2 shell have been reported, these SiO 2 -coated LHPs still suffer from limited stability. Herein, MAPbBr 3 (MA = CH 3 NH 3 + ) nanoparticles encapsulated in double hydrophobic shells of organic functionalized SiO 2 and poly(vinylidene fluoride) (MAPbBr 3 @SiO 2 /PVDF) are successfully synthesized by infiltrating the MAPbBr 3 precursor solution into hollow siliceous nanospheres and followed by PVDF capping. With the dual protection of SiO 2 and PVDF, the MAPbBr 3 @SiO 2 /PVDF nanoparticles exhibit drastically improved stability against water and UV-light illumination. A white light-emitting diode with luminous efficiency up to 147.5 lm W –1 and a color gamut encompassing 120% of National Television System Committee in Commission Internationale de L’Eclairage 1931 color space has been demonstrated using the MAPbBr 3 @SiO 2 /PVDF nanoparticles as the green light source. This study enlightens new insights into the synthesis of highly stable LHPs-based core–shell–shell architectures toward their practical applications.